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Resolved Caveats—Cisco IOS Release 12.0(23)S6
Resolved Caveats—Cisco IOS Release 12.0(23)S6
Cisco IOS Release 12.0(23)S6 is a rebuild release for Cisco IOS Release 12.0(23)S. The caveats in this
section are resolved in Cisco IOS Release 12.0(23)S6 but may be open in previous Cisco IOS releases.
Basic System Services
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CSCeb66973
Symptoms: A Cisco router or switch may reload when it attempts to read the ifIndex information
from an NVRAM file during the bootup process.
Conditions: This symptom is observed when the NVRAM file is corrupt.
Workaround: Disable the ifIndex persistence.
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CSCed32794
Symptoms: Executing the tftp-server slaveslot0: global configuration command, or any
configuration commands related to tftp-server being set to access flash devices on the slave, will
cause the slave to reload.
Conditions: This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(23)S5 but is not platform dependent.
Workaround: Configure the tftp-server to access flash devices on the master route switch processor
(RSP) only.
Interfaces and Bridging
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CSCin34068
Symptoms: Interfaces may not be created when a channel group is configured on a Cisco 7500 series
or a Cisco 7600 series.
Conditions: This symptom is observed only if channel groups are created on an 8-port multichannel
T1 port adapter (PA-MC-8T1) and the PA-MC-8T1 is replaced with an enhanced 8-port
multichannel T1/E1 PRI port adapter (PA-MC-8TE1+) by performing an online insertion and
removal (OIR). After the port adapters are switched, the channel-group configuration on the
PA-MC-8TE1+ does not work as expected.
Workaround: Remove the channel-group configuration on a port adapter before performing an OIR
and replacing the port adapter with another port adapter.
IP Routing Protocols
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CSCea79487
Symptoms: A Cisco router that is configured with IP multicast may reload because of a bus error.
Conditions: This symptom is observed when a router sends (S,G) R join overrides to a neighbor, and
the neighbor times out because of link flaps or because of another reason. The symptom is caused
by a timing difficulty and is most likely to occur when you enter the ip pim spt-threshold infinity
global configuration command on all routers in the network.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1917
Resolved Caveats—Cisco IOS Release 12.0(23)S6
For a list of the affected releases, go to the following location:
http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCds31596. Cisco IOS
software releases that are not listed in the “First Fixed-in Version” field at this location are not
affected.
Workaround: Delete the ip pim spt-threshold infinity global configuration command from all
routers in the network to minimize the occurrence of the symptom.
•
CSCec29953
Symptoms: A retransmission counter may not be reset when a neighbor is terminated.
Conditions: This symptom is observed on a Cisco platform that is running Open Shortest Path First
(OSPF) when the retransmission limit default (12 or 24) is added to the retransmission mechanism.
Workaround: Clear the OSPF process by entering the clear ip ospf process pid privileged EXEC
command. Then, enter the limit retransmissions non-dc disable router configuration command.
•
CSCec51206
Symptoms: A memory allocation failure (MALLOCFAIL) from the I/O memory pool may occur.
Condition: This symptom is observed on a Cisco router that receives excessive multicast control
traffic.
Workaround: Apply a quality of service (QoS) policy map to limit the rate of the multicast control
traffic that can be received by the router.
•
CSCin52817
Symptoms: A Cisco router may reload unexpectedly when you manually reload the router.
Conditions: This symptom is observed when Open Shortest Path First (OSPF) LSAs are being
“maxaged” while you manually reload the router. This situation may occur because of a fluctuating
network and is an extreme corner case that cannot be reproduced on demand. The symptom is very
unlikely to occur.
Workaround: There is no workaround.
Miscellaneous
•
CSCdw33267
Symptoms: The router may not resolve all dependent routes for a path again.
Conditions: This symptom is observed if the shutdown interface command followed by the no
shutdown interface configuration command is issued on the next hop router on a Cisco router that
has Multiprotocol Label Switching (MPLS) enabled.
Workaround: A clear ip route for the affected prefix would take down all the paths and ensure that
they are rebuilt and hence reresolved. Also the problem does not arise if a shutdown is not
performed.
•
CSCdx83297
Symptoms: A software-forced reload may occur due to an I/O memory corruption and redzone
overrun.
Conditions: This symptom is observed on a Cisco 7200VXR or VIPs with the following Port
Adaptors installed: PA-MC-2T1, PA-MC-4T1, PA-MC-8T1, PA-MC-8DSX1,
PA-MC-2E1,PA-MC-8E1, PA-MCX-4TE1,PA-MCX-8TE1, PA-MCX-8TE1+, PA-MC-8TE1+.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1918
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S6
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CSCea08050
Symptoms: A Cisco router may reload if the show ip access- list access-list-name command is
performed on an existing reflexive access-list.
Conditions: This symptom is observed on a Cisco 3620 router that is running Cisco IOS
Release 12.3(13).
Workaround: There is no workaround.
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CSCea11455
Symptoms: After applying the maximum of 32 Committed Access Rate (CAR) rules and removing
them, subsequent attempts to add any new input CAR (iCAR) rules may not be applied, and the
router may generate an error message.
Conditions: This symptom is observed on a Cisco 12000 series Engine (E4) Packet-over-SONET
(POS) line card.
Workaround: Reload the router.
•
CSCea72540
Symptoms: A Performance Route Processor (PRP) may reload after the following error message is
displayed:
PRP-3-ASM_CORRUPT_PTR
Conditions: This symptom is observed on a Cisco 12000 series on which a defective 1-port OC-192
Packet-over-SONET (POS) Enhanced Services (ES) Engine line card is installed. The symptom
occurs because error recovery does not function properly.
Workaround: There is no workaround.
•
CSCea87364
Symptoms: Distributed Cisco Express Forwarding (DCEF) may become disabled on a Versatile
Interface Processor (VIP) or Cisco 12000 series line card (LC), and the following error message may
appear on the console:
%FIB-3-FIBDISABLE: Fatal error, slot 12: Window did not open, LC to RP IPC is
non-operationa
Conditions: This symptom is observed on a Cisco 7500 series VIP2-50 and VIP4- 80 in which ATM
OC-3 port adapters such as the PA-A1-OC3 or PA-A3-OC3 are installed when the Cisco 7500 series
is upgraded to Cisco IOS Release 12.0(24) S or Release 12.0(24)S1. This symptom is also observed
on a Cisco 12000 series LC during significant, prolonged routing table churn.
Workaround: Reload CEF on the VIP or LC by entering the clear cef linecard slot-number EXEC
command.
Alternate Workaround: Restart the VIP by performing an online insertion and removal (OIR).
Restart the LC by executing the hw-module slot slot # reload command.
•
CSCeb22276
Symptoms: Some Simple Network Management Protocol (SNMP) packets may linger in the input
queue while they are processed. However, the packets do exit the queue on their own without any
intervention from the user. This fix allows these packets to be removed from the queue more quickly.
Conditions: This symptom is observed on a device that runs Cisco IOS software and that supports
SNMP operations. In addition, the SNMP request must contain a valid community string.
Workaround: Protect the SNMP community strings with good password management. Permit SNMP
traffic only from trusted devices.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1919
Resolved Caveats—Cisco IOS Release 12.0(23)S6
•
CSCeb27452
Symptoms: A Cisco router that functions in a Multiprotocol Label Switching (MPLS) environment
may reload unexpectedly with a bus error.
Conditions: This symptom is observed under rare circumstances when the router attempts to send
an Internet Control Message Protocol (ICMP) packet that was triggered by an MPLS packet.
Workaround: There is no workaround.
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CSCeb56909
Cisco Routers running Internetwork Operating System (IOS) that supports Multi Protocol Label
Switching (MPLS) are vulnerable to a Denial of Service (DoS) attack on MPLS disabled interfaces.
The vulnerability is only present in Cisco IOS release trains based on 12.1T, 12.2, 12.2T, 12.3 and
12.3T. Releases based on 12.1 mainline, 12.1E and all releases prior to 12.1 are not vulnerable.
More details can be found in the security advisory which is posted at
http://www.cisco.com/warp/public/707/cisco-sa-20050126-les.shtml.
•
CSCeb75449
Symptoms: Cisco Express Forwarding (CEF) interface tables may become corrupted on a Cisco
12000 series line card, causing traffic to be dropped and the following error message to be logged
by the affected line card:
%ADJ-3-ADJFIBIDB: Adjacency update with invalid fibidb(1)
This situation may cause some or all of the CEF interface information to be removed from the
affected line card, which you can verify in the output of the show cef interface EXEC command for
the affected line card.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS Release
12.0(26)S when a series of clear cef linecard EXEC commands are executed in quick succession.
Workaround: Enter the clear cef linecard EXEC command just once for the affected line card.
•
CSCeb79576
Symptoms: An outgoing label may not be installed in the Label Forwarding Information Base
(LFIB) for an IP version 4 (IPv4) prefix.
Conditions: This symptom is observed when the prefix is learned via a Border Gateway Protocol
(BGP) session. This situation may occur when the prefix is deleted in the Label Information Base
(LIB) and not allocated to any local label binding.
Workaround: There is no workaround.
•
CSCec07487
Symptoms: An interface may not transmit traffic because the output may be stuck. When this
symptom occurs, the console of the Route Switch Processor 4 (RSP4) may display the following
error messages:
%ISDN-6-LAYER2DOWN: Layer
%ISDN-6-LAYER2DOWN: Layer
%ISDN-6-LAYER2DOWN: Layer
%RSP-3-RESTART: interface
2 for Interface
2 for Interface
2 for Interface
Serial1/0/0:15,
Se1/0/2:15, TEI0 changed to down
Se1/0/1:15, TEI0 changed to down
Se1/0/3:15, TEI0 changed to down
not transmitting
Output Stuck on Serial1/0/0:15
%RSP-3-RESTART: interface Serial1/0/1:15, output frozen
%RSP-3-RESTART: interface Serial1/0/2:15, not transmitting
%RSP-3-RESTART: cbus complex
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1920
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S6
Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release
12.1(19)E1 when the compress stac caim interface configuration command is configured on the
interface. The symptom may also occur in other releases.
Workaround: Remove the compress stac caim interface configuration command from the interface.
•
CSCec11122
Symptom: A Cbus Complex may occur and the packet memory may be recarved, causing a
temporary disruption in service.
Conditions: This symptom is observed on a Cisco 7500 series when you install an 8-port
multichannel T1/E1 PRI port adapter (PA-MC-8TE1+) or an enhanced 2-port T1/E1 high-capacity
port adapter (PA-VXC-2TE1+) and when you configure the port adapter via the command-line
interface (CLI) for E1 or T1.
Workaround: There is no workaround. Try to install the port adapter during a maintenance window.
•
CSCec32648
Symptoms: A Frame Relay interface line protocol and/or routing protocol states continually go
down.
Conditions: The problem occurs on Frame Relay interfaces of 512 Kbps or lower bandwidth with a
service-policy output command referring to a policy map that contains the priority command,
whenever the interface is congested for more than 30 seconds with packets larger than 512 bytes.
Workaround: There is no workaround.
•
CSCec33028
Symptoms: A 1-port E3 serial port adapter (PA-E3) may fail to recover to the “up/up” state even
when the original cause of the failure is corrected.
Conditions: This symptom is observed on a Cisco 7500 series.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the interface of the PA-E3.
•
CSCec34274
Symptoms: An Engine 4+ (E4+) Gigabit Ethernet (GE) line card in a Cisco 12000 series that is
running Cisco IOS Release 12.0(26)S may reload and display one of the following sets of error
messages:
1. %MCC192-3-CPUIF_ERR: Underrun Error: Read Pointer crosses Write Pointer.
2. %FIB-3-FIBDISABLE: Fatal error, slot #: IPC Failure: timeout %CPUIF-3-NO_MEM:
sendreq_freeq is NULL.
Conditions: This symptom occurs when the line card receives a bad IP packet whose actual length
does not match what the IP header indicates.
Workaround: There is no workaround.
•
CSCec45985
Symptoms: Fabric handling may fail because of unknown events.
%FABRIC-0-OPERATIONAL: Fabric handling failed: Unknown eventreceived by the fab
process %SCHED-3-THRASHING: Process thrashing on watched boolean íFIA queyrí.
-Process= "Fabric", ipl= 6, pid= 11
-Traceback= 50235770 50235864 50407968 5021E644 5021E630
Conditions: This symptom is observed on a Cisco 12410 series Internet router that has an 8xOC3
ATM Engine 3 line card and a 4xOC12 POS Engine 3 line card that is configured with 150 VPN
routing/forwarding (VRF) interfaces. The router is running Cisco IOS Release 12.0(23)S4.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1921
Resolved Caveats—Cisco IOS Release 12.0(23)S6
Workaround: There is no workaround.
•
CSCec48008
Symptoms: An interface may have an ifIndex value of 4294967295 (-1) and some interfaces may not
be in the ifTable.
Conditions: This symptom is observed when a system is in Stateful Switchover (SSO) mode and
then is configured to change the redundancy mode to Route Processor Redundancy Plus (RPR+).
The standby Performance Routing Engine (PRE) then restarts. If new interfaces are added to the
system (the ifTable) at this point and the primary PRE is not reloaded, the symptom occurs.
Workaround: Perform a reload of both Route Processors (RPs).
Alternate workaround: Perform a forced switchover from SSO mode to RPR+ mode.
•
CSCec54090
Symptoms: The following message is observed after executing shutdown subinterface of ATM:
%GENERAL-3-EREVENT: c10k_atm_vc_state_change: No current_if_info
Conditions: This symptom is observed on a Cisco 10008 Internet router that is running the
Cisco IOS image c10k-p10-mz.120-23.S3b under the following conditions:
1. ATM interface: down/down with pvc configuration on subinterface.
2. ATM interface: initializing/down with no LC and pvc configuration on subinterface.
This error message can be observed when executing no shut/shut subinterface in the above
conditions.
Workaround: There is no workaround.
Further Problem Description: When main ATM interface is down (could be either admindown or
down), create a point-to-point atm subinterface with vbr-nrt vc in shutdown state. Then deleting pvc
underneath the atm subinterface, or deleting the atm subinterface itself, can cause the losing of
bandwidth on ATM interface.
For more details, look at the Release-note for CSCed62971.
•
CSCec75189
Symptoms: Two interfaces may have the same Cisco Express Forwarding (CEF) interface
description block (IDB) when the following configuration sequence occurs:
1) You create a subinterface.
2) You delete this subinterface.
3) You create another subinterface.
4) You recreate the first subinterface.
Conditions: This symptom is observed on a Cisco 7500 series that runs Cisco IOS Release 12.0 S or
Release 12.2 S.
Workaround: There is no workaround. Reload the router to clear the condition.
•
CSCec77478
Symptoms: When a Cisco IOS software image runs on a standby Performance Routing Engine
(PRE) together with an older version of Cisco IOS software that runs on the primary PRE, the
following error message may appear on the standby router:
%IDBINDEX_SYNC-3-IDBINDEX_ENTRY_LOOKUP: Cannot find IDB index table entry: "", 79
After a switchover from the primary PRE to the standby PRE occurs, the interfaces for which the
above error messages appear may not be able to send or receive packets.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1922
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S6
Conditions: This symptom is observed on a Cisco 10000 series during a Fast Software Upgrade
(FSU) operation.
Workaround: There is no workaround.
•
CSCec79849
Symptoms: A line card may experience high CPU usage, and report alignment and spurious memory
access error messages.
Conditions: This symptom is observed on the line card of a Cisco 12000 series Internet router.
Workaround: There is no workaround.
•
CSCec81198
Symptoms: A service policy may not attach to an interface. When you enter the show policy-map
interface EXEC command, the output displays all counters at 0.
Conditions: This symptom is observed on a Cisco router when a policy map is configured on an IP
Services Engine (ISE) line card for the Cisco 12000 series router with policing set to less than 64
kbps, and the Cisco IOS software is being upgraded from a release prior to 12.0(26)S up to
Cisco IOS Release 12.0(26)S.
Workaround: Make sure that the policing rate is larger than 64 kbps. The service policy may then be
attached to the interface.
•
CSCec82298
Symptoms: A software-forced reload may occur on a Cisco 12000 series router.
Conditions: This symptom is observed on a Cisco 12000 series router after a service policy is
enabled.
Workaround: There is no workaround.
•
CSCec88027
Symptoms: An Engine 4 Plus (E4+) Gigabit Ethernet (GE) or Fast Ethernet (FE) line card that is
configured with Any Transport over MPLS (AToM) may fail.
Conditions: This symptom is observed on an E4+ GE or FE line card on a Cisco 12000 series router
that is running Cisco IOS Release 12.0(26)S as soon as a soft online insertion and removal (OIR) is
performed on the primary clock scheduler card (CSC).
Workaround: There is no workaround.
•
CSCec89151
Symptoms: The link LED light of a Gigabit Ethernet (GE) line card on a Cisco 12000 series does
not light if the port is shut down and brought back up (i.e., shutdown).
Conditions: This symptom is observed on a Cisco 12000 series when the no negotiation auto
interface configuration command is entered on the router.
Workaround: Remove the optical RX cable, and then reconnect the cable.
•
CSCed02859
Symptoms: During installation of a router on an OC-48 DPT/RPR ring, the ring became unstable,
and 5 Cisco 12000 series routers reloaded, one reloading twice.
Conditions: This symptom is observed on a mix of Cisco 12016 routers and Cisco 12416 routers that
are running Cisco IOS Release 12.0(23)S3 3DES software.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1923
Resolved Caveats—Cisco IOS Release 12.0(23)S6
•
CSCed03356
Symptoms: The deletion of an ATM subinterface may occasionally cause a secondary Performance
Routing Engine (PRE) to reload.
Conditions: This symptom is observed on a Cisco 10000 series that has two PREs that are configured
for high availability.
Workaround: There is no workaround. However, the symptom does not affect performance. The
primary PRE continues to forward traffic. The secondary PRE will reload if it is configured to do so.
•
CSCed10778
Symptoms: A failure of an active Route Processor (RP) may cause the standby RP to fail also.
Conditions: This symptom is observed in Cisco 12000 series Internet routers.
Workaround: There is no workaround.
•
CSCed14064
Symptoms: On a Cisco router that is configured with LLQ, there is queueing on the real time queue.
Conditions: This symptom is observed on a Cisco 10000 ESR that is configured with LLQ.
Workaround: There is no workaround.
•
CSCed15797
Symptoms: On Engine 2 (E2) n-port OC3 line cards for the Cisco 12000 series router, the pos delay
triggers path router configuration command does not implement the specified delay. This results in
the link being brought down for Path Alarm Indication Signal (PAIS) or Path Remote Defect
Indication (PRDI) defects whose duration is smaller than the specified delay time.
Conditions: This symptom is observed in all releases of Cisco IOS Release 12.0 ST and in all
releases of 12.0 S beginning with Release 12.0(22)S.
Workaround: There is no workaround.
•
CSCed20379
Symptoms: A 6-port CT3 line card crashed due to a Cache Parity Exception. The router will not
reload.
Conditions: This symptom occurs on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(23)S3 image c12kprp-p-mz.
Workaround: There is no workaround.
•
CSCed27956
A vulnerability in the Transmission Control Protocol (TCP) specification (RFC793) has been
discovered by an external researcher. The successful exploitation enables an adversary to reset any
established TCP connection in a much shorter time than was previously discussed publicly.
Depending on the application, the connection may get automatically re-established. In other cases,
a user will have to repeat the action (for example, open a new Telnet or SSH session). Depending
upon the attacked protocol, a successful attack may have additional consequences beyond
terminated connection which must be considered. This attack vector is only applicable to the
sessions which are terminating on a device (such as a router, switch, or computer) and not to the
sessions that are only passing through the device (for example, transit traffic that is being routed by
a router). In addition, this attack vector does not directly compromise data integrity or
confidentiality.
All Cisco products which contain TCP stack are susceptible to this vulnerability.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1924
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S6
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-ios.shtml, and it describes this
vulnerability as it applies to Cisco products that run Cisco IOS® software.
A companion advisory that describes this vulnerability for products that do not run Cisco IOS
software is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-nonios.shtml.
•
CSCed29752
Symptoms: On a Cisco 12000 series router that is performing the Label Edge Router (LER)
functionality, packets may leave the outbound interface unlabeled if the ingress line card is an ISE
even though the destination network appears as tagged in the CEF and TFIB table.
Conditions: This problem has been observed to IP destination addresses using a recursive route. If
the problem occurs, the corresponding outputs of show ip cef prefix display an outbound label for
the appropriate next-hop. But the output of show ip hardware-cef for this IP address does not
display any label.
Further Problem Description: IP packets entering an MPLS network should be labeled if an LDP
neighbor is established and the appropriate entries are in the RT, FIB and TFIB. The label imposition
takes place in hardware of ISE on the ingress line card. Thereby the hardware information has to
follow the control plane information. If the problem is present the control plane information looks
consistent but it is not coincident with the hardware information of the ingress line card.
Workaround: There is no workaround.
•
CSCed33627
Symptoms: A 3-port Gigabit Ethernet (GE) line card may show BMA error, then run error recovery.
Conditions: This symptom is observed on a Cisco 12008/40 router that is running Cisco IOS
12.0(23)S5. It is configured as an MPLS inter-AS ASBR. It is also configured as a PE router. When
entering the shut command followed by the no shut command on a POS interface on a 8POS LC,
the 3GE LC will show BMA error.
Workaround: There is no workaround.
•
CSCed38527
A vulnerability in the Transmission Control Protocol (TCP) specification (RFC793) has been
discovered by an external researcher. The successful exploitation enables an adversary to reset any
established TCP connection in a much shorter time than was previously discussed publicly.
Depending on the application, the connection may get automatically re-established. In other cases,
a user will have to repeat the action (for example, open a new Telnet or SSH session). Depending
upon the attacked protocol, a successful attack may have additional consequences beyond
terminated connection which must be considered. This attack vector is only applicable to the
sessions which are terminating on a device (such as a router, switch, or computer) and not to the
sessions that are only passing through the device (for example, transit traffic that is being routed by
a router). In addition, this attack vector does not directly compromise data integrity or
confidentiality.
All Cisco products which contain TCP stack are susceptible to this vulnerability.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-ios.shtml, and it describes this
vulnerability as it applies to Cisco products that run Cisco IOS® software.
A companion advisory that describes this vulnerability for products that do not run Cisco IOS
software is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-nonios.shtml.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1925
Resolved Caveats—Cisco IOS Release 12.0(23)S6
•
CSCed39059
Symptoms: The tag forwarding table for a line card on Cisco platforms that have distributed (i.e.
linecard based) forwarding, such as the Cisco 7500 Series and the Cisco 12000 Series, may not have
complete entries even though the Route Processor (RP) does. This results in ingress tagged traffic
being dropped for the missing tag forwarding entries.
Conditions: This symptom is observed on Cisco platforms that have distributed (i.e. linecard based)
forwarding in a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN)
environment with a provider edge (PE) router to customer edge (CE) router link.
The problem is more likely to happen if the PE to CE link experiences quick flaps of an interface
(i.e. goes down and come back up in a very small amount of time (e.g. 2 sec)). Although this can
happen on any linecard, this situation is more likely to happen on the Engine 3(E3) channelized
OC48 line cards due to its quick flapping behavior.
Note: There are additional prerequisites for this bug to happen. These are:
- The defect affects routers that are: (a) MPLS VPN PE routers or (b) routers that exchange labels
for ipv4 BGP routes.
- For (a) there should be recursive routes on the PE that go over the PE-CE link (this could be either
BGP learnt recursive routes or static recursive routes). Also, these recursive routes have the link’s
CE side ip address as their nexthop.
- There should be a less specific route to get to the nexthop (this can be a default route). This applies
for (a) and (b).
Workaround: There is no workaround.
•
CSCed44319
Symptoms: A file that is copied to an ATA disk may become corrupted.
Conditions: This symptom is observed on any Cisco IOS image that contains the fix for
CSCdz27200. The problem does not occur on a disk that is formatted with 16 or less sectors/cluster
Workaround: Use an ATA disk that is formatted with 16 or less sectors/cluster.
•
CSCed44793
This caveat consists of two separate systems, conditions, and workarounds.
Symptoms 1: A router may reload after a switchover to the standby processor.
Conditions 1: This symptom is observed on a Cisco Route Switch Processor (RSP).
Workaround1: There is no workaround.
Symptoms 2: After a switchover to a standby processor, the indices of the interfaces in the system
may be changed by mistake. This may cause problems with forwarding packets and may cause other
inconsistencies.
Conditions 2: This symptom is observed on a Cisco 12000 series router.
Workaround 2: There is no workaround.
•
CSCed47409
Symptoms: In Cisco IOS software that is running Multiprotocol Label Switching (MPLS), a router
may reload after accessing a freed Label Information Base (LIB) entry. When the symptom occurs,
an error message similar to the following is likely to precede the reload:
%TIB-3-LCLTAG: 10.10.10.10/10.10.10.10, tag advert; unexpected tag state=13
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1926
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S6
Conditions: This symptom is observed when a very uncommon timing of a Label Distribution
Protocol (LDP) events occurs. The symptom may occur with LDP or Tag Switching Distribution
Protocol (TDP).
Workaround: There is no workaround.
•
CSCed68575
Cisco Internetwork Operating System (IOS) Software releases trains 12.0S, 12.1E, 12.2, 12.2S,
12.3, 12.3B and 12.3T may contain a vulnerability in processing SNMP requests which, if exploited,
could cause the device to reload.
The vulnerability is only present in certain IOS releases on Cisco routers and switches. This
behavior was introduced via a code change and is resolved with CSCed68575.
This vulnerability can be remotely triggered. A successful exploitation of this vulnerability may
cause a reload of the device and could be exploited repeatedly to produce a Denial of Service (DoS).
This advisory is available at http://www.cisco.com/warp/public/707/cisco-sa-20040420-snmp.shtml
•
CSCed68763
Symptoms: Engine 2 line cards may fail upon clearing BGP peers.
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(27)S.
Workaround: There is no workaround.
•
CSCed72340
Symptoms: Some MQC commands on 4xOC3 and 8xOC3 ISE line cards on Cisco 12000 series
routers may result in a message similar to the following:
% Service policy on FR sub-interface POS1/1.2 must be hierarchical.
Due to the error, no policy is applied to the interface. Even though the running configuration has the
policy on the interface, the policy will not take effect.
Conditions: This symptom is observed on Cisco 12000 series routers.
Workaround: There is no workaround.
•
CSCin35896
Symptoms: The outgoing label for a prefix that is received through Border Gateway Protocol (BGP)
IP version 4+ (IPv4+) labels may not be installed in the Tag Forwarding Information Base (TFIB).
Conditions: This symptom is observed if the router that performs a BGP IPv4+ label exchange
receives a label withdraw request for an MPLS label from a BGP peer that is followed by a
readvertisement of the label. This symptom occurs if the no mpls ip global configuration command
followed by the mpls ip global configuration command is executed on the peer router; however, the
label withdraw request may be triggered in other ways also.
Workaround: Enter the clear ip route prefix EXEC command to correct the symptom.
•
CSCin57765
Symptoms: A router may become unresponsive and may reload when you append a file whose size
is not a multiple of 512 bytes to an Advanced Technology Attachment (ATA) flash card (for
example, boot disk, disk0, disk1).
For example, this situation may occur when you enter the show command | tee /append url
privileged EXEC command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1927
Resolved Caveats—Cisco IOS Release 12.0(23)S5
Conditions: This symptom is observed on a Cisco platform that runs a Cisco IOS image that contains
the fix for caveat CSCdz27200 and that utilizes an ATA flash card. A list of the affected releases can
be found at http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCdz27200.
Cisco IOS software releases that are not listed in the “First Fixed-in Version” field at this location
are not affected.
Workaround: Write the output of the show command to a new file instead of appending it to an
existing file by entering the show command | tee url privileged EXEC command.
•
CSCuk41728
Symptoms: A router may reload.
Conditions: This symptom is observed when Web Cache Communication Protocol (WCCP) and
Cisco Express Forwarding (CEF) are both enabled on the router.
Workaround: Disabling CEF is a possible workaround, but this workaround may impact the
performance of the router.
•
CSCuk48314
Symptoms: During an SSO switchover, the newly active Route Processor (RP) may output the
following error message:
%SCHED-7-WATCH: Attempt to monitor uninitialized watched queue (address 0).
-Process= "CEF LC IPC Background"
This error is harmless, and no functional problem will occur when this error is received.
Conditions: This symptom occurs during an SSO switchover.
Workaround: There is no workaround.
Wide-Area Networking
•
CSCec83030
Symptoms: A parity error on a Versatile Interface Processor (VIP) card may cause other VIPs to go
to a wedged state.
Conditions: This symptom is observed on a Cisco 7500 series router.
Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(23)S5
Cisco IOS Release 12.0(23)S5 is a rebuild release for Cisco IOS Release 12.0(23)S. The caveats in this
section are resolved in Cisco IOS Release 12.0(23)S5 but may be open in previous Cisco IOS releases.
Interfaces and Bridging
•
CSCeb38393
Symptoms: A Cisco 7500 series may generate the following message on its console:
%VIP-3-BADMALUCMD: Unsupported MALU command 81/82
Conditions: This symptom is observed on a Cisco 7500 series that is running Cisco IOS
Release 12.0(23)S1.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1928
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S5
IP Routing Protocols
•
CSCeb17467
Symptoms: A Cisco router may reload when Border Gateway Protocol (BGP) is configured to carry
Virtual Private Network version 4 (VPNv4) routes.
Conditions: This symptom is observed when VPNv4 import processing occurs simultaneously with
a BGP neighbor reset, for example, when a VPN routing and forwarding (VRF) instance is
configured and you enter the clear ip bgp * privileged EXEC command.
Workaround: There is no workaround.
•
CSCeb22359
Symptoms: A Cisco 12000 series may reload when you enter the show bgp ipv6 unicast or show
bgp ipv6 multicast user EXEC or privileged EXEC mode command.
Conditions: This symptom is observed when IP version 6 (IPv6) multicast is configured.
Workaround: There is no workaround.
•
CSCeb85136
Symptoms: After a Performance Routing Engine 1 (PRE1) cutover in Route Processing Redundancy
Plus (RPR+) mode in a Stateful Switchover (SSO) image, no virtual circuit (VC) is recovered.
Conditions: This symptom is observed when the high availability (HA) configuration mode is
changed to the RPR+ mode from the default SSO mode on an SSO image when the HA cutover is
completed.
Workaround: There is no workaround.
•
CSCec23559
Symptom: A Cisco router running Multicast Source Discovery Protocol (MSDP) may reload when
the show ip mdsp peer peer-address advertised-SAs user EXEC/privileged EXEC command is
entered.
Condition: These symptoms are only observed on a router that is running MDSP.
Workaround: 1)Enter the no ip domain-lookup command in global configuration mode. 2)If the ip
host {name} {address1} global configuration command is configured, the host name should not be
more than 36 characters.
IP Routing Protocols
•
CSCec16481
A Cisco device running Internetwork Operating System (IOS) and enabled for the Open Shortest
Path First (OSPF) Protocol is vulnerable to a Denial of Service (DoS) attack from a malformed
OSPF packet. The OSPF protocol is not enabled by default.
The vulnerability is only present in IOS release trains based on 12.0S, 12.2, and 12.3. Releases based
on 12.0, 12.1 mainlines and all IOS images prior to 12.0 are not affected. Refer to the Security
Advisory for a complete list of affected release trains.
Further details and the workarounds to mitigate the effects are explained in the Security Advisory
which is available at the following URL:
http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1929
Resolved Caveats—Cisco IOS Release 12.0(23)S5
ISO CLNS
•
CSCdz30118
Symptoms: On a Cisco router, Intermediate System-to-Intermediate System Version 6 (IS-ISv6)
routes may not be inserted in the IPv6 routing table after a reload or after a neighbor’s interface state
changes. This symptom affects only configurations with level-2-only links.
Conditions: This symptom may be observed on Cisco routers that are running Cisco IOS
Release 12.0(22)S.
Workaround: Use the clear isis * privileged EXEC command after a reload or after a topology
change. Use level 1-2 links.
Miscellaneous
•
CSCdx59391
Symptoms: A Cisco 7500 series router that acts as the penultimate hop of the backup Label Switched
Path (LSP) and that is configured with the mpls traffic-eng signalling interpret explicit-null
verbatim router configuration command may have the primary LSP go down when Fast ReRoute
(FRR) is enabled on the router.
Conditions: This symptom is observed on a Cisco 7500 series that has Multiprotocol Label
Switching (MPLS) traffic engineering (TE) configured.
Work around: Do not configure the mpls traffic-eng signalling interpret explicit-null verbatim
router configuration command.
•
CSCdy42383
Symptoms: A router may not load balance traffic properly between two OC-48 Packet over SONET
(POS) Engine 2 (E2) line cards.
Conditions: This symptom is observed on a Cisco 12416 series Internet router that is running Cisco
IOS Release 12.0(21)ST2 and that has two OC-48 POS E2 line cards.
This symptom is observed while the Cisco 12416 has incoming traffic from an Engine 4 (E4) line
card and outgoing traffic is sent through the E2 line card via parallel links. This symptom does not
occur if the incoming card is replaced with an E2 line card.
Workaround: There is no workaround.
•
CSCdy67021
Symptoms: When an hw-module slot <x> reload is issued on the server card, some error messages
plus tracebacks appear. Sessions are also nonoperational.
Conditions: This symptom occurs on Cisco 12000 series routers that are running Cisco IOS
Release 12.0(22)S.
Workaround: There is no workaround.
•
CSCdy74384
Symptoms: Per Interface Rate Control (PIRC) does not act on IP traffic that would have otherwise
been tagged (MPLS) if the current hop was not the pin- ultimate hop for a given destination. PIRC
does not act on IP traffic with destination addresses that have an implicit-null label as their label
binding.
Conditions: This symptom is observed on a Cisco 12000 series router.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1930
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S5
•
CSCdz17192
Symptoms: A 4-port OC-3 Packet-over-SONET (POS) Engine 0 line card that is installed in slot 14
of a Cisco 12416 may reload because of a bus error. In the output of the show context all EXEC
command, the value of the badVaddr field is 0x14.
Conditions: This symptom is observed on a Cisco 12416 that runs Cisco IOS Release 12.0(21)S1,
Release 12.0(23)S2, or Release 12.0(23)S3. More 12.0 S releases may be affected.
Workaround: There is no workaround.
•
CSCdz30140
Symptoms: When creating IP version 6 (IPv6) Access Control Lists (ACLs), the following message
is displayed several times:
%Access list already exists with these parameters
In some cases, looking at the ACL indicates unwanted commands that are added, such as the
following:
permit ipv6 any any sequence 20
deny 0 any any sequence 30
These statements cannot be removed from the ACL. In other cases, lines of the ACL are modified.
If a remark is added to the ACL once, then it will be repeated in ACL several times.
Conditions: These symptoms are observed in Cisco IOS releases from Cisco IOS Release 12.0(23)S
to Cisco IOS Release 12.0(26)S. The symptoms are seen only when the router has dual gigabit route
processors (GRPs) installed and with different redundancy modes configured.
Workaround: There is no workaround.
•
CSCdz35216
Symptoms: A router permanently pauses when removing certain types of policies from the interface.
Conditions: This symptom is observed on a Cisco router if the policy has bandwidth configured on
class-default. When this policy is removed, the router permanently pauses.
Workaround: There is no workaround.
•
CSCdz35426
Symptoms: A primary Route Processor (RP) and a standby RP may not load the correct image when
a Cisco 12000 series router is reloaded.
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S2 or an earlier release when all of the following conditions are present:
- An Advanced Technology Attachment (ATA) disk or a Flash card such as a Personal Computer
Memory Card International Association (PCMCIA) card is installed in both the primary RP and the
standby RP.
- The Route Processor Redundancy (RPR) mode is enabled.
- The boot system tftp ip-address global configuration command is enabled in the configuration.
The symptom does not occur when the Route Processor Redundancy plus (RPR+) mode or the
Stateful Switchover (SSO) feature is enabled.
Workaround: Use the RPR+ mode or the SSO feature.
Alternate Workaround for Cisco IOS Release 12.0(22)S2 only: After the RPs have booted up,
remove the boot system tftp ip- address global configuration command from the configuration and
execute the upgrade rom-monitor EXEC command to enable the ROM monitor to be upgraded.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1931
Resolved Caveats—Cisco IOS Release 12.0(23)S5
•
CSCdz53693
Symptoms: The ip access-group interface configuration command does not function on a
PortChannel interface.
Conditions: This symptom is observed in Cisco IOS Release 12.0(23)S1.
Workaround: There is no workaround.
•
CSCdz54497
This caveat consists of two symptoms, two conditions, and two workarounds:
Symptom 1: The interface index of a tunnel interface may be corrupt, and the output of the show
running-config privileged EXEC command may display the following information:
%FIB-2-IFINDEXILLEGAL: An internal software error occurred. Argument ifindex is out
of bounds at -1.
Condition 1: This symptom is observed on a Cisco 7500 series after a switchover has occurred and
you first add a tunnel interface, then remove the tunnel interface, and then add the tunnel interface
again.
Workaround 1: There is no workaround.
Symptom 2: Cisco Express Forwarding (CEF) may not form adjacencies across a 2-port
multichannel T3 port adapter (PA-MC-2T3+) as is indicated in the output of the show cef interface
type number EXEC command (in this example, serial interface 12/0/0/8:0 is used):
% CEF IDB corresponding to Serial12/0/0/8:0 is not found
Condition 2: This symptom is observed on a Cisco 7500 series after a switchover has occurred and
you first add a serial interface, then remove the serial interface, and then add the serial interface
again.
Workaround 2: There is no workaround.
•
CSCdz57717
Symptoms: When Stateful Switchover (SSO) is configured and you enter the hw-module reload
privileged EXEC command on a 4-port OC3 ATM line card before the standby Route Processor (RP)
has come up completely, the standby RP may reload.
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(24)S.
Workaround: There is no workaround.
•
CSCdz63644
Symptoms: After a Performance Routing Engine 1 (PRE1) cutover in Route Processing Redundancy
Plus (RPR+) mode in a Stateful Switchover (SSO) image, no virtual circuit (VC) is recovered.
Conditions: This symptom is observed when the high availability (HA) configuration mode is
changed to the RPR+ mode from the default SSO mode on an SSO image when the HA cutover is
completed.
Workaround: There is no workaround.
•
CSCdz66770
Symptoms: Tag Distribution Protocol (TDP) may not convey the label change information for a
prefix that is learned via an exterior Border Gateway Protocol plus (EBGP+) label to its TDP peers.
Conditions: This symptom is observed on a Cisco 7500 series when TDP is used. The symptom does
not occur when Label Distribution Protocol (LDP) is used.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1932
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S5
•
CSCea05010
Symptoms: An outgoing adjacency for a Virtual Private Network (VPN) routing/forwarding (VRF)
prefix always points to a virtual interface in distributed Cisco Express Forwarding (dCEF).
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S5.
Workaround: There is no workaround.
•
CSCea16628
Symptoms: An Engine 3 (E3) Gigabit Ethernet line card may reload or cause the router that it is
installed on to reload.
Conditions: This symptom is observed when an E3 Gigabit Ethernet line card that has 1000 VLANs
and that is sending line rate IP version 6 (IPv6) traffic on the VLANs is reloaded.
Workaround: There is no workaround.
•
CSCea52387
Symptoms: An Engine 3 (E3) line card may exhibit “ALPHA” errors and reload.
Conditions: This symptom is observed on a Cisco 12000 series that has per- prefix accounting
configured when the clear ip route * privileged EXEC command is entered to delete IP routing table
entries.
Workaround: Disable per-prefix accounting.
•
CSCea72654
Symptoms: A Cisco router that is running Multiprotocol Label Switching (MPLS) may reload after
a message similar to the following is generated:
%SYS-3-OVERRUN: Block overrun at 5414B2C8 (red zone 00000000)
Conditions: This symptom is observed when more than 672 Label Distribution Protocol (LDP)
sessions are established simultaneously and when LDP cannot perform some background tasks for
an advertised Label Information Base (LIB) entry before the local label is changed or withdrawn.
Workaround: There is no workaround.
•
CSCea75184
Symptoms: A memory allocation (malloc) failure may occur during a Cisco Express Forwarding
(CEF) process on a redundant Route Processor (RP) and may cause the redundant RP to stop
processing queued CEF update messages that are sent by the active RP. This malloc failure may be
observed in the output of the show cef linecard EXEC command.
Because the redundant RP no longer processes CEF update messages that are sent by the active RP,
the message queue on the active RP continues to grow, causing the free memory of the active RP to
decrease. The rate of this decrease depends on the rate of prefix changes in the network. The
continued growth of the message queue eventually results in a malloc failure on the active RP, or
results in CEF being disabled.
Conditions: This symptom is observed on a Cisco router that is configured with redundant RPs.
Workaround: Reload the redundant RP by entering the hw-module secondary-cpu reset EXEC
command.
•
CSCea86724
Symptoms: A Cisco router that is configured for IP over Multiprotocol Label Switching (MPLS)
may reload. CPUHOG messages may be displayed on the console before the router reloads.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1933
Resolved Caveats—Cisco IOS Release 12.0(23)S5
Conditions: This symptom is observed in configurations with many interfaces or IP addresses, or
with a very large number of labelled prefixes.
Workaround: There is no workaround.
•
CSCeb01400
Symptoms: At least 30 percent of the CPU of a Performance Routing Engine 1 (PRE-1) may be
utilized to process flows, causing the number of packets that are processed per second to be much
lower than you would expect.
Conditions: This symptom is observed on a Cisco 10000 series when NetFlow and NetFlow export
are enabled and when there is a large number of flows (more than 10,000).
Workaround: Disable NetFlow.
Alternate Workaround: Reduce the number of entries in the NetFlow cache of the Route Processor
(RP) by entering the ip flow-cache entries 1024 global configuration command. Doing so reduces
the load of the CPU of the PRE-1. Note that the primary cache is located on the Parallel Express
Forwarding (PXF) processor and supports a fixed number of 512 entries.
•
CSCeb06981
Symptoms: The traceroute privileged EXEC command may not work for the IP address of a generic
routing encapsulation (GRE) tunnel in a Multiprotocol Label Switching (MPLS) network, and the
router at the receiving end may generate traceback error messages.
Conditions: This symptom is observed in an MPLS network when you configure a generic routing
encapsulation (GRE) tunnel between a Cisco 10000 series that is configured as a provider edge (PE)
router and another PE router.
Workaround: To determine a path in the MPLS network, shut down the GRE tunnel and enter the
traceroute privileged EXEC command for the IP address of the physical link.
Alternate Workaround: Reload the microcode onto the Parallel Express Forwarding (PXF) by
entering the microcode reload pxf privileged EXEC command.
•
CSCeb28065
Symptoms: A Cisco router that is configured for IP over Multiprotocol Label Switching (MPLS)
may reload.
Conditions: This symptom is observed when Label Distribution Protocol (LDP) peers of the
Cisco router advertise a large number of IP addresses because interfaces flap or are configured.
Workaround: There is no workaround.
•
CSCeb58067
Symptoms: In a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) network,
when primary traffic engineering (TE) tunnels are configured between provider edge (PE) routers,
and these primary TE tunnels are configured for Fast Reroute (FRR) link protection, a 50-ms
convergence time may not be achieved in the core of the network, even when very small VPN routing
and forwarding (VRF) prefix tables are configured.
Conditions: This symptom is observed when the PE headend router is the point of local repair (PLR).
The PE headend router is the router that performs VPN label imposition, that functions as the
primary TE tunnel headend, and that functions as the uplink to a provider (P) router.
Workaround: There is no workaround. Note that FRR link protection functions correctly for IP
version 4 (IPv4) traffic and for Any Transport over MPLS (AToM) traffic. Also, note that FRR link
protection functions correctly for VPN traffic on PLRs other than the PE headend that is mentioned
in the conditions, such as a P router that functions as a link to another P router, and a P router that
functions as a downlink to a PE router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1934
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S5
•
CSCeb58214
Symptoms: An IP packet with multiple fragments sent through a Cisco 12000 series Internet router
that is running Cisco IOS Release 12.0(23)S, 12.0(24)S, 12.0(25)S, or 12.0(26)S may drop small
fragments of the packet when MPLS Label disposition takes place, which exposes the underlying IP
packet.
Conditions: The egress line card must be an Engine 4+ variant for this to occur, and the fragment
must have the MF bit set with an IP payload of 8, 16 or 24 bytes.
Workaround: Configure an explicit null label for the prefix, which creates a TAG to TAG switching
path instead of a TAG to IP path.
•
CSCeb77582
Symptoms: A 1-port OC-12 ATM line card may reset after the Forwarding Information Base (FIB)
is disabled because of interprocess communications (IPC) failures, as is shown by the following
error messages:
%GRP-3-BAD_STATE: Slot:6 State:Launching Fabric Downloader -Traceback= 18BA90 3BC3E4
2C7E34 2C891C 2C8BEC
%GRP-3-BAD_STATE: Slot:6 State:Launching Fabric Downloader -Traceback= 18BA90 3BC3E4
2C7E34 2C891C 2C8BEC
%FIB-3-FIBDISABLE: Fatal error, slot 6: IPC Failure: timeout %GRP-4-RSTSLOT:
Resetting the card in the slot: 6,Event: EV_AUTO_LC_RELOAD_ON_FIBDISABLE
%GRP-3-BAD_STATE: Slot:6 State:In Reset -Traceback= 18BA90 3BC3E4 305DA4 3067C4
306850 306FA8 3070C0
Conditions: This symptom is observed on a Cisco 12416 that runs the c12kprp-p-mz image of
Cisco IOS Release 12.0(23)S3 and that is configured with the following line cards:
- One 1-port OC-12 ATM line card
- Two 4-port OC-3 Packet-over-SONET (POS) line cards
- Two 4-port OC-12 POS line cards
- Two 4-port OC-48 POS line cards
- Two 3-port Gigabit Ethernet line cards
Workaround: There is no workaround.
•
CSCeb81538
Symptoms: An Engine 4 line card may reload when an Engine 2 line card sends a corrupt
Multiprotocol Label Switching (MPLS) packet.
Conditions: This symptom is observed on a Cisco 12000 series that is configured for MPLS.
Workaround: There is no workaround.
•
CSCeb85985
Symptoms: Simple Network Management Protocol (SNMP) values that are retrieved by the
snmpget command may be inconsistent compared to the SNMP values that are shown on an
interface.
Conditions: This symptom is observed on a Cisco 12000 series that runs in a Multiprotocol Label
Switching (MPLS) environment when you use SNMP to retrieve various counter values from a
Packet-over-SONET (POS) interface.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1935
Resolved Caveats—Cisco IOS Release 12.0(23)S5
•
CSCeb86270
Symptoms: In Cisco IOS software that is running Multiprotocol Label Switching (MPLS), the Label
Distribution Protocol (LDP) peer address table may become corrupted and cause the router to
reload.
Conditions: This symptom may be observed in situations where three or more routers have
advertised the same IP address in LDP address messages. This normally happens when routers have
been misconfigured but in very rare circumstances may be done deliberately.
The circumstance can be recognized by the presence of the following error message:
%TAGCON-3-DUP_ADDR_RCVD: Duplicate Address 10.0.0.1 advertised by peer 10.2.2.2:0 is
already bound to 10.1.1.1:0
If only one such message is seen for a given IP address—10.0.0.1 in the above example—then only
two routers have advertised the IP address, and only the second is being treated as a duplicate. At
least one more such message should be seen if at least three routers have advertised the IP address
in question.
Workaround: The problem does not happen in typical configurations because duplicate addresses are
not configured. If such a configuration is accidentally done, the failure may be avoided if the
configuration is corrected before the LDP session to any of the involved peers goes down. If the
configuration is deliberate, there is no workaround.
•
CSCec00523
Symptoms: Under certain conditions, for example Stateful Switchover (SSO) or entering the clear
cef linecard EXEC command, the Engine 3 line cards in a router reload with error messages related
to ALPHA errors in the table look-up (TLU) stage. The following strings in the error message will
be seen:
“%EE48-3-ALPHAPAIR: RX ALPHA: TLU PAIR registers”
Conditions: This symptom occurs only when there are loadbalance paths for Multiprotocol Label
Switching (MPLS) traffic, and some route changes occur.
Workaround: Ensure that there are no loadbalance paths.
•
CSCec09193
Symptoms: When a subinterface is configured with a subinterface number value larger than 65535,
the protocol enabled on this subinterface may not be in the proper state for correct operation after
the switchover.
Conditions: These symptoms have been observed on Cisco platforms with redundant Route
Processors operating in stateful switchover (SSO) redundancy mode.
Workaround: Limit the subinterface number value to an integer less than 65535 while configuring
subinterfaces.
•
CSCec12991
Symptoms: The Sampled NetFlow (SNF) cache is empty on a 3-port Gigabit Ethernet (GE) interface
card.
Conditions: This symptom is observed on a GE interface card when Multiprotocol Label Switching
(MPLS) is configured on one port and SNF is on another port of the GE card.
Workaround: If MPLS is not configured, SNF functions correctly.
•
CSCec13559
Symptoms: On Packet-over-SONET (POS) Engine 2 line cards for a Cisco 12000 series router,
IP2TAG traffic does not get rate limited by Per Interface Rate Control (PIRC).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1936
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S5
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S5.
Workaround: There is no workaround.
•
CSCec14259
Symptoms: Quality of service (QoS) multicast packets are not correctly marked on input.
Conditions: This symptom is observed on a Cisco router when ingress QoS multicast packets are
classified. The precedence or Differentiated Services Code Point (DSCP) bit is ignored and
misclassified.
Workaround: There is no workaround.
•
CSCec16725
Symptoms: Ethernet over Multiprotocol Label Switching (EoMPLS) disposition fails for egress
Packet-over-SONET (POS) Engine 4 plus (E4+) line card. Tag bytes increment as traffic comes in,
but nothing is sent out the egress 3-port Gigabit Ethernet (GE) interface.
Conditions: This symptom is observed on a Cisco 12416 router that is running Cisco IOS
Release 12.0(22)S5.
Workaround: Use a different card or router for the EoMPLS disposition but do not use the E4+ line
card.
•
CSCec17262
Symptoms: In a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) network, if
a Cisco 10720 router receives an MPLS packet with an IP version 4 (IPv4) option underneath it, the
MPLS packet has two or more labels, and the router attempts to untag all labels, the Parallel Express
Forwarding (PXF) processor may reload.
When this symptom occurs in the MPLS VPN network, egress provider edge (PE) routers may
reload. The packets that cause the routers to reload are Internet Control Message Protocol (ICMP)
echo and echo reply packets with record route options. Other types of IPv4 options may also cause
the routers to reload.
Conditions: The symptom is observed on a Cisco 10720 that functions as an MPLS VPN PE router.
The symptom does not occur in a basic MPLS network without VPN, where there is only one label.
Workaround: There is no workaround.
•
CSCec18944
Symptoms: When the ROM of an active Performance Route Processor (PRP) is upgraded, the PRP
may pause indefinitely. When the ROM of the standby PRP is upgraded, the upgrade may cause an
exception and the standby PRP may reload.
Conditions: These symptoms have been observed when ROM upgrades are performed, and the up
all all or up rom slot-number commands are configured on the active and standby PRPs.
Workaround: There is no workaround.
•
CSCec20473
Symptoms: A 3-port Gigabit Ethernet (GE) line card may stop transmitting traffic.
Conditions: This symptom is observed on a Cisco 12000 series that is configured as a Multiprotocol
Label Switching (MPLS) provider edge (PE) router that is running Cisco IOS Release 12.0(25)S1.
Workaround: Use the hw-module slot x reload privileged EXEC command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1937
Resolved Caveats—Cisco IOS Release 12.0(23)S5
•
CSCec30795
Symptoms: If traffic passes on multiple ports of an 8-port Fast Ethernet (FE) card and the shutdown
interface configuration command is entered on one of the traffic-flowing ports, all the other ports
stop passing traffic.
Conditions: This symptom is observed on a Cisco 10000 series with an 8-port Fast Ethernet (FE)
card that is running a Performance Routing Engine 1 (PRE1) image of Cisco IOS Release
12.0(23)S4. There is no special configuration required to experience this symptom. Ports that pass
traffic with a basic default configuration will experience the symptom.
Workaround: Enter the no shutdown interface configuration command to free the other ports. Do
not shut down any port on an 8-port Half Height (HH) FE line card until a fix is available.
•
CSCec31790
Symptoms: The following error may cause a Cisco 10000 series to reload:
%ERR-1-GT64120 (PCI-0): Fatal error, Memory parity error (external)
Conditions: This symptom is observed on a Cisco 10000 series when a single bit Error-Correcting
Code (ECC) error is detected in the Synchronous Dynamic RAM (SDRAM).
Workaround: There is no workaround.
•
CSCec37164
Symptoms: The following symptoms occur with a traceroute from a remote Customer Edge (CE)
router to a local CE router with TTL set to expire at the Provider Edge (PE) router attached to the
local CE.
-If the IP packet length of the traceroute is equal to or less than 72 bytes, the Provider Edge (PE)
router replies with an ICMP TTL expired message with the VPN interface address.
-If the IP packet length of the traceroute is equal to or more than 73 bytes, the PE replies with an
ICMP TTL expired message with the MPLS core interface address.
Condition: These symptoms have been observed in an MPLS VPN environment, with a Cisco 12000
series Internet router running Cisco IOS Release 12.0(23)S4 used as the PE and a 3-Port Gigabit line
card used as the MPLS and VPN interface.
Workaround: There is no workaround.
•
CSCec37416
Symptoms: An IP Services Engine (ISE) line card on a Cisco 12000 series Internet router running
Cisco IOS Release 12.0(25)S1 or 12.0(24)S2 shows the following log messages that can lead to the
line card being reset:
SLOT 4:Sep 20 22:59:46: %EE48-3-ALPHAERRSS: RX ALPHA: ALPHA_CPU_IF100_INT error 1400
control FFFF03FF
SLOT 4:Sep 20 22:59:46: %EE48-3-ALPHAERR: RX ALPHA: error: cpu int 1 mask 277FFFFF ...
SLOT 4:Sep 21 07:16:20: %LC-3-ERRRECOVER: Corrected a transient error on line card.
...
SLOT 4:Sep 21 07:16:40:: %EE48-3-ALPHAFLOW: rx alpha netflow: Out of order add-delete
reports
Conditions: These symptoms are observed only under a load when full (non-sampled) aggregated
Netflow (ip route-cache flow) is configured on an ISE line card interface.
This problem is not seen with Cisco IOS Release 12.0(25)S, 12.0(25)S2, 12.0(24)S1,and 12.0(26)S.
It has been observed with Cisco IOS Release 12.0(25)S1 and 12.0(24)S2.
Workaround: There is no workaround, except to remove full aggregated Netflow.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1938
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S5
•
CSCec38222
Symptoms: The OC192E/POS-VSR line card is reloaded with watchdog timeout (sig=23) by
process = IPC Seat Manager on a Cisco 12416 router that is running Cisco IOS Release 12.0(23)S3.
The log message displays the following:
SLOT 10:Sep 22 20:08:21.291: %MBUS_SYS-3-ENQUEUE: Failed to queue message from slot
6 stream 3
SLOT 10:Sep 22 20:09:22.287: %MBUS_SYS-3-ENQUEUE: Failed to queue message from slot
6 stream 3
SLOT 10:Sep 22 20:09:44.727: %SYS-2-WATCHDOG: Process aborted on watchdog timeout,
process = IPC Seat Manager.
-Traceback= 400EBCB4 400EF7F0 400E7534 405B620C 405B6438 40597C64 40558AD0 40559248
4011C728 405676F8 400C2874 400C286
Conditions: This symptom occurs because the watchdog timeout (sig=23) by process = IPC Seat
Manager in OC192E/POS-VSR line card.
SLOT 10:Sep 22 20:09:44.727: %SYS-2-WATCHDOG: Process aborted on watchdog timeout,
process = IPC Seat Manager.
Workaround: There is no workaround. When this symptom occurs, the line card is automatically
reloaded.
•
CSCec42012
Symptoms: A Cisco 12008 router displays the following error message:
"%FABRIC-0-INIT"
at boot up. Switch fabric card (SFC) incorrectly recognizes a “Primary Clock” as *CSC_0*.
Conditions: This symptom is observed on Cisco 12008 routers that are running Cisco IOS
Release 12.0(21)ST5 or later releases.
Workaround: There is no workaround.
•
CSCec42163
Symptoms: While running Cisco IOS Release 12.0(22)S3, a Cisco 10720 router may reload with the
following logs displayed:
%TOASTER-2-FAULT: T0 HW Exception: CPU[t0r3c3] NULLRD at 0x0C94 LR 0x0818
%TOASTER-2-FAULT: T0 Exception summary: CPU[t0r3c3] Stat=0x00000006 HW=0x00000800
LB=0x00000000 SW=0x00000000
Conditions: This symptom occurs only after adding a new subinterface to the router, and traffic starts
passing on it.
Workaround: There is no workaround.
•
CSCec48925
Symptoms: When running in non-redundant PRE mode, after a crash, the line cards do not get reset.
In rare cases, after Cisco IOS software reloads, there may be a mismatch between the Cisco IOS
software and the line card so that the line card does not pass traffic.
Conditions: These symptoms have been observed after Cisco IOS is restarted after a crash when
running in non-redundant PRE mode. Anything that goes through the formal reload path (with a
single PRE1 in the system) will properly reset the line cards on the way down. This fix resets the
cards on the way up as well in case they weren’t reset on the way down.
Workaround: There is no workaround. However, after a Cisco IOS software crash, if a line card is
not passing traffic, resetting the line card might fix the issue. A reload of the chassis will definitely
fix the issue.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1939
Resolved Caveats—Cisco IOS Release 12.0(23)S4
•
CSCec50935
Symptom: An Engine 2 line card crashes.
Condition: This symptom is observed when Traffic Engineering (TE) tunnels are configured.
Workaround: There is no workaround
•
CSCec59882
Symptoms: A Reverse Path Forwarding (RPF) check should be disabled for bootp packets with the
source IP address 0.0.0.0 and the destination IP address 255.255.255.255. However, PXF currently
disables RPF checks for all packets with the source IP address 0.0.0.0.
Conditions: These symptoms have been observed on Cisco IOS Release 12.0(22)S and later.
Workaround: There is no workaround.
Wide-Area Networking
•
CSCdx72556
Symptoms: Link Control Protocol (LCP) negotiations may fail, and a “failed to negotiate with peer”
message may be displayed.
Conditions: This symptom is observed on a Cisco universal access server if the peer sends more than
five Configure-Negative acknowledgments (CONFNAKs) or Configure-Rejects (CONFREJs) on
the link for the current or previous LCP negotiation.
Workaround: Configure the ppp max-failure 10 command on the link to allow the remote peer to
exhaust the Negative acknowledgment (NAK) or Reject acknowledgment (REJ) count and resume
negotiations before the Cisco universal access server drops the link.
•
CSCec13050
Symptoms: A router may reload when doing a show running-config command after creating a
channelized group interface.
Conditions: This symptom may be observed if channelized interfaces had previously been created,
configured with Frame Relay encapsulation and subsequently deleted without removing the
encapsulation first.
Workaround: Remove the Frame Relay encapsulation before deleting the channel group interface.
Resolved Caveats—Cisco IOS Release 12.0(23)S4
Cisco IOS Release 12.0(23)S4 is a rebuild release for Cisco IOS Release 12.0(23)S. The caveats in this
section are resolved in Cisco IOS Release 12.0(23)S4 but may be open in previous Cisco IOS releases.
Basic System Services
•
CSCdv46906
Symptoms: A router may send linkUp traps with the loclfReason attribute set as “Down” and
linkDown traps with the loclfReason attribute set as “Up.”
Conditions: This symptom is observed on a Cisco router.
Workaround: Query the link status using the command-line interface (CLI) or Simple Network
Management Protocol (SNMP).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1940
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S4
•
CSCdz60890
Symptoms: The ifIndex may not synchronize when you use third-party vendor software with
Cisco IOS software and a standby router comes up after a Stateful Switchover (SSO) has occurred.
Conditions: This symptom is observed on a Cisco 12416 that is running Cisco IOS
Release 12.0(24)S and that has line cards that are configured with about 2000 Gigabit Ethernet (GE)
subinterfaces.
Workaround: Reduce the number of GE subinterfaces. (For example, with only 10 GE subinterfaces,
the symptom does not occur.)
•
CSCdz87017
Symptoms: Information about a port adapter (PA) may be missing from the output of a show diag
command.
Conditions: This symptom is observed on a controller with a memory size of 128 MB DRAM and
8192 KB SRAM. The controller displays the following information:
PA Bay 0 Information: Fast-Ethernet PA, 1 ports, 100BaseTX-ISL EEPROM format version
0 HW rev 0.00, Board revision UNKNOWN Serial number: 00000000 Part number: 00-0000-00
PA Bay 1 Information: Fast-Ethernet PA, 1 ports, 100BaseTX-ISL EEPROM format version
1 HW rev 1.00, Board revision A0 Serial number: 08534388 Part number: 73-1688-04
Workaround: There is no workaround.
•
CSCeb11253
Symptoms: A Cisco router may reload because of a watchdog timeout condition when you poll the
ciscoEnvMonTemperatureStatusValue MIB variable.
Conditions: This symptom is observed when the MIB variable has an index that is larger than 6.
Indexes 0 to 6 are valid indexes; indexes that are larger than 6 are not valid indexes.
Workaround: There is no workaround.
•
CSCuk38757
Symptoms: The cardIfTable table is not correctly populated for channelized interfaces. All of the
entries return a value of “-1”.
Conditions: This symptom is observed on a Cisco 7500 series that is running Cisco IOS
Release 12.0(22)S.
Workaround: There is no workaround.
EXEC and Configuration Parser
•
CSCeb29079
Symptoms: When any command that triggers the nonvolatile generation (NVGEN) process is
executed through a new vty session, certain interface configuration commands that support the Best
Effort Method, such as the ip vrf interface configuration command, the ntp disable interface
configuration command, and the service-policy output interface configuration command, may not
properly synchronize with a standby Route Processor (RP) or Performance Routing Engine (PRE)
because of a failure in the post NVGEN process.
For example, when you enter the ip vrf interface configuration command while the show
running-config privileged EXEC command is being executed in a Telnet session, the configuration
of the ip vrf interface configuration command may not properly synchronize with the standby RP
or PRE, and a “Post NVGEN failure” message may be generated.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1941
Resolved Caveats—Cisco IOS Release 12.0(23)S4
Conditions: This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(23)S2 or a later release.
Workaround: Do not enter commands that trigger the NVGEN process while you configure
commands that support the Best Effort Method.
IP Routing Protocols
•
CSCdy13646
Symptoms: A Cisco 12416 router may reload because of a watchdog timeout in the Border Gateway
Protocol (BGP) I/O process.
Conditions: This symptom is observed when a Cisco 12416 router that is configured with 575 BGP
peers and three 1-port OC-12 ATM line cards, each of which is configured with 500 ATM permanent
virtual connection (PVC) subinterfaces, is booted with Cisco IOS Release 12.0(22)S.
Workaround: There is no workaround.
•
CSCdz14924
Symptoms: When the customer edge (CE) peer of a provider edge (PE) router has the neighbor
default-originate router configuration command enabled, which enables the PE router to send the
default route to the CE, the default route may be sent with the wrong mask (255). When this situation
occurs, the CE router sends a notification that states that an illegal network entry has occurred and
flaps the session.
Conditions: This symptom is observed on a Cisco 7200 series router that functions as a PE router
but may also occur on another platform that functions as a PE router.
Workaround: There is no workaround.
•
CSCdz70283
Symptoms: A router may reload when a Virtual Private Network (VPN) neighbor is deleted.
Conditions: This symptom is observed on a Cisco router that has a VPN neighbor.
Workaround: There is no workaround.
•
CSCea01405
Symptoms: A customer edge (CE) router may reject next-hop routes to a provider edge (PE) router.
Conditions: This symptom is observed when the PE router does not advertise itself as the next hop
to the CE router that is configured for external Border Gateway Protocol (eBGP).
Workaround: Configure the PE router as the BGP next hop for the CE router by entering the
neighbor ip-address next-hop-self router configuration command on the PE router.
•
CSCea52921
Symptoms: A router may inadvertently remove link-state advertisements (LSAs) from the
retransmission list and prevent the Open Shortest Path First (OSPF) neighbor from receiving the
latest version of the LSA. This behavior may cause some prefixes to be unreachable.
Conditions: This behavior may occur when the LSA is not received by the neighboring router and
the LSA must be retransmitted. While the LSA is waiting in the neighbor retransmission queue,
certain events may cause a regeneration of the same LSA. If there is no change in the LSA, the router
may mistakenly remove the LSA from the retransmission queues of all neighbors.
Workaround: This symptom normally stops occurring after the LSA is refreshed. If this symptom
continues to occur, unconfigure and reconfigure the network global configuration command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1942
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S4
•
CSCea60188
Symptoms: A Border Gateway Protocol (BGP) next-hop router may not redistribute Virtual Private
Network (VPN) routes.
Conditions: This symptom is observed on a Cisco router that runs Cisco IOS Release 12.0 S or
Release 12.2 S.
Workaround: There is no workaround.
•
CSCeb57086
Symptoms: A Cisco 10000 series that is configured with two Performance Routing Engine 1
(PRE-1) processors may stop functioning as a redundant system.
Conditions: This symptom is observed when you enter the bgp upgrade-cli router configuration
command.
Workaround: Reload the standby PRE-1.
•
CSCin51310
Symptoms: You may not be able to configure the ip vrf receive interface configuration command.
Conditions: This symptom is observed when the interface on which you attempt to configure the ip
vrf receive interface configuration command does not have an IP address configured.
Workaround: First configure an IP address on the interface, then enter the ip vrf receive interface
configuration command on the interface.
Miscellaneous
•
CSCdy32809
Symptoms: Engine 4 plus (E4+) line cards may not fragment outgoing pings properly, causing pings
of packets with a size that is larger than the maximum transmission unit (MTU) to fail.
Conditions: This symptom is observed on E4+ line cards (4-port OC-48 and 1- port OC-192 line
cards) that are installed in a Cisco 12000 series.
Workaround: For pings, use packets with a size that is smaller than the MTU.
•
CSCdy41594
Symptoms: On a Cisco 10000 series edge services router (ESR) that has a Channelized OC-12 line
card and is configured for Synchronous Digital Hierarchy (SDH) framing, the controllers and
interfaces will not come up if you configure an “AU-4-TUG-3” other than number 1.
Conditions: These symptoms have been observed only when “AU-4-TUG-3” number 1 has not been
configured. Once the number 1 controller has been configured, all other controllers function
properly.
Workaround: Configure the number 1 “AU-4-TUG-3” controller before configuring any others. The
controller needs to remain configured for the other controllers to work, even if it is not used.
•
CSCdz30278
Symptoms: A secondary Route Processor (RP) may reload.
Conditions: This symptom is observed on a Cisco router that is configured for Stateful Switchover
(SSO) when a static route in the format “ip route 10.10.10.10 255.255.255.255 ethernet4/0/1” is
configured on the primary RP.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1943
Resolved Caveats—Cisco IOS Release 12.0(23)S4
•
CSCdz42789
Symptoms: When you configure a Virtual Private Network (VPN) on a router that is configured with
dual Route Processors (RPs), a VPN routing/forwarding (VRF) table ID that is associated with a
particular VRF instance may have different values in the active RP and the standby RP. This
situation causes failures in the processing of Cisco Express Forwarding (CEF) interprocess
communication (IPC) messages on the standby RP for CEF IPC messages that contain an
inconsistent VRF table ID, and CEF may be disabled.
Inconsistent VRF table IDs may also cause a memory loss on the standby RP, and when a switchover
occurs from the active RP to the standby RP, more difficulties may occur.
Conditions: These symptoms are observed on router that is configured for Stateful Switchover
(SSO) when VRF instances are deleted.
Workaround: There is no workaround; however, these actions minimize the occurrence of the
symptoms:
– Ensure that no VRF instances are deleted.
– If VRF instances are deleted, wait for few minutes for the deletion to be completed on the active
RP before you configure new VRF instances. The output of the show ip vrf EXEC command
displays the deleted VRF instances (a “*” in front of a VRF instance indicates that the VRF
instance is being deleted).
– If you install a new RP and VRF instances have been deleted from the configuration of the active
RP, reload the router.
•
CSCdz48366
Symptoms: The configuration of commands may cause additional memory to be held by an execute
process.
Conditions: This symptom is observed when commands are configured on a Cisco router.
Workaround: If the execute process belongs to a terminal session or a console session, terminate the
execute session by entering the exit command.
•
CSCdz69177
Symptoms: A spurious memory access may occur on the Versatile Interface Processor (VIP) of a
Cisco 7500 series, even though the VIP does not reload.
Conditions: This symptom is observed when Multiprotocol Label Switching (MPLS) forwarding is
enabled.
Workaround: There is no workaround.
•
CSCdz81721
Symptoms: If the no shutdown interface configuration command is entered on interfaces that are
already in the “up” state, the interfaces enter the “down” state.
Conditions: This symptom is observed on the interfaces of a 16-port OC-3 Packet over SONET
(POS) line card that is installed on a Cisco 12000 series.
Workaround: Reload the router to bring up the interfaces.
•
CSCea29102
This caveat consists of two symptoms, two conditions, and two workarounds:
1.
Symptoms: A Route Processor (RP) may reload when you enter the clear ip bgp * privileged
EXEC command while interfaces flap continuously.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1944
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S4
Conditions: This symptom is observed when Virtual Private Network (VPN) routing/forwarding
(VRF) forwarding is configured on the interfaces that flap.
Workaround: There is no workaround.
2.
Symptoms: An RP may reload when you simultaneously enter the clear ip bgp * privileged
EXEC command and perform an online insertion and removal (OIR) by entering the hw-reload
reset EXEC command.
Conditions: This symptom is observed when you perform an OIR of an interface that has a VRF
configuration in which the connected route is learned via a network statement. The connected
route is removed when you perform the OIR.
Workaround: Do not simultaneously enter the clear ip bgp * privileged EXEC command and
perform an OIR.
•
CSCea34003
Symptoms: A 4-port OC-48 Packet-over-SONET (POS) Engine 4 plus (E4+) line card may stop
forwarding traffic after you reload microcode onto the line card.
Conditions: This symptom is observed on a Cisco 12000 series that is running the gsr-p-mz image
of Cisco IOS Release 12.0(22)S, Release 12.0(23)S, Release 12.0(24)S, or Release 12.0(25)S and
that is functioning as a provider edge (PE) router in a Carrier Supporting Carrier configuration when
the 4-port OC- 48 POS E4+ line card interconnects the Cisco 12000 series and a customer edge (CE)
router.
Workaround: Enter the clear ip bgp privileged EXEC command on the Cisco 12000 series.
•
CSCea42298
Symptoms: The E3 controller of a 1-port multichannel E3 port adapter (PA-MC-E3) card is missing
from the IF-MIB and DS3-MIB MIBs.
Conditions: This symptom is observed when you run the IF-MIB MIB or DS3-MIB MIB for a
PA-MC-E3. The symptom occurs in all Cisco IOS releases.
Workaround: There is no workaround.
•
CSCea42620
Symptoms: A Tag Forwarding Information Base (TFIB) Virtual Private Network version 4 (VPNv4)
entry on an Autonomous System Boundary Router (ASBR) for a prefix may not be reinstalled,
causing traffic for this prefix to continue to flow to a provider edge (PE) router via the previous best
path.
Conditions: This symptom is observed in a Multiprotocol Label Switching (MPLS) VPN
interautonomous system environment in which ASBRs are performing VPNv4 exchanges and in
which a Border Gateway Protocol (BGP) session is active.
The ASBR on which the TFIB VPNv4 entry is not installed should receive a prefix from a Route
Reflector (RR) that selects the best of two available paths between the RR and two PE routers. Both
PE routers should allocate the same label for the prefix. The PE router to which the best path leads
should withdraw the prefix.
Workaround: Clear the BGP session on the ASBR that is connected to the RR.
Alternate Workaround: Withdraw the prefix from the ASBR and readvertise the prefix by clearing
the prefix on the PE router that advertises the prefix.
•
CSCea48741
Symptoms: After a single transmit buffer management (TBM) error occurs on an 8- port OC-3 ATM
line card, the line card may stop forwarding inbound and outbound traffic.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1945
Resolved Caveats—Cisco IOS Release 12.0(23)S4
Conditions: This symptom is observed on a Cisco 12000 series.
Workaround: There is no workaround.
•
CSCea56694
Symptoms: A Cisco 10000 series may reload because of a bus error exception.
Conditions: This symptom is observed if a label value of 500 or greater is entered in the label-value
argument of the show hardware pxf cpu mpls labels label-value privileged EXEC command such
as in the following examples:
Router# show hardware pxf cpu mpls labels 500
or
Router# show hardware pxf cpu mpls labels 2-500
The Cisco 10000 series does not reload if a label value of less than 500 is entered in the label-value
argument of the show hardware pxf cpu mpls labels label-value privileged EXEC command such
as in the following examples:
Router# show hardware pxf cpu mpls labels 499
or
Router# show hardware pxf cpu mpls labels 2-499
Workaround: There is no workaround.
•
CSCea60559
Symptoms: The Simple Network Management Protocol (SNMP) agent may use 99 percent of the
CPU bandwidth of a Route Processor (RP) for an arbitrarily long time (hours or days), without
necessarily generating CPUHOG errors. This situation causes other processes on the router to fail
because these processes do not receive the CPU bandwidth that they require:
– Routes may time out.
– Tunnels may go down.
– Accessing the router via a Telnet connection to a network port may become impossible.
– The command-line interface (CLI) via the console line may become quite slow to respond.
The output of the show snmp summary EXEC command may indicate that the number of requests
is “N” while the number of replies that were sent is “N-1.” The output of the show processes cpu |
include SN EXEC command may indicate that the SNMP process uses 99 percent of the CPU
bandwidth of the RP.
Conditions: These symptoms are observed when the MPLS-LSR-MIB MIB is enabled, you query
the mplsXCTable or a MIB walk occurs, and there are more than 10,000 Multiprotocol Label
Switching (MPLS) labels active. The symptoms are platform independent.
Workaround: Perform the following steps:
1.
Shut down interfaces to bring the total count of active MPLS labels down to far below 10,000.
2.
Disable the MPLS-LSR-MIB MIB by entering the following sequence of commands:
snmp-server view nolsrmib mplsLsrMIB exclude
snmp-server community public view nolsrmib ro
snmp-server view nolsrmib iso include
3.
Enter the no shutdown interface configuration command on all the interfaces that you shut
down in Step 1.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1946
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S4
•
CSCea80474
Symptoms: On a Cisco router that runs IP over Multiprotocol Label Switching (MPLS), the Route
Processor (RP) on which Label Distribution Protocol (LDP) is configured may attempt to access
freed memory, causing the router to reload.
Conditions: This symptom is observed in rare situations on a Cisco router when an interface with
hundreds of associated IP addresses is administratively disabled.
Workaround: There is no workaround.
•
CSCea85463
Symptoms: When NetFlow data is processed at interrupt-level, the CPU utilization of a route
processor (RP) may become high.
Conditions: This symptom is observed on a Cisco 10000 series when NetFlow is configured and
many small data flows are processed on the router.
Workaround: There is no workaround.
•
CSCea87403
Symptoms: Any Transport over MPLS (AToM) traffic may be dropped at the disposition line card.
Conditions: This symptom is observed on a Cisco 12000 series when the Any Transport over MPLS
(AToM): ATM Cell Relay over MPLS feature is enabled on an 8-port OC-3 ATM line card and the
disposition line card is an Engine 3 line card, such as a 4-port OC-12 Packet-over-SONET (POS)
line card or a 1-port OC-48 POS line card.
Workaround: There is no workaround.
•
CSCea91756
Symptoms: On a Cisco platform, free memory may decrease gradually during normal system
operation. When network instability occurs, free memory may decrease in the order of tens of MBs
over a short period of time.
The output of the show processes memory EXEC command indicates that the Border Gateway
Protocol (BGP) router process holds an amount of memory that is increasing as the free memory is
decreasing.
Conditions: This symptom is observed on a Cisco platform that is running Cisco IOS
Release 12.0(23)S1 or a later release and that has the ip default-network network-number global
configuration command enabled.
Workaround: Disable the ip default-network network-number global configuration command to
stop the free memory from decreasing. However, to free up the held memory, reload the platform.
•
CSCeb01485
Symptoms: Interfaces on one Engine 4 (E4) 3-port Gigabit Ethernet (GE) port adapter
(EPA-3GE-SX/LH-LC) may use the same interface description blocks (IDBs) as interfaces of an
adjacent E4 3-port GE port adapter that is installed on the same GE modular baseboard
(EPA-GE/FE-BBRD). This situation may cause forwarding difficulties and Cisco Express
Forwarding (CEF) inconsistencies on other line cards that are installed in the same router. You can
verify the symptoms in the output of the show cef interface EXEC command.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with more than
one GE modular baseboard when several E4 3-port GE port adapters are installed on a single
GE modular baseboard.
Workaround: Reload the router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(23)S4
•
CSCeb02623
Symptoms: A 3-port Gigabit Ethernet line card may stop processing traffic after the Gigabit Route
Processor (GRP) has reloaded.
Conditions: This symptom is observed on a Cisco 12000 series when autonegotiation is enabled.
Workaround: Reload the microcode onto the line card.
•
CSCeb04441
Symptoms: When an ATM link flaps or a remote ATM platform reloads, a Fast Etherchannel may
fail and Enhanced Interior Gateway Routing Protocol (EIGRP) neighbors that are connected via the
Fast Etherchannel may be lost.
Conditions: This symptom is observed on a Cisco 7500 series that runs the rsp-pv-mz image of
Cisco IOS Release 12.0(21)S5.
Workaround: There is no workaround.
•
CSCeb05628
Symptoms: The convergence time after a forced Stateful Switchover (SSO) may be longer than
10 seconds.
Conditions: This symptom is observed on a Cisco 10000 series that is configured for SSO.
Workaround: There is no workaround.
•
CSCeb06989
Symptoms: A value of 4,294,967,295 (hexadecimal 0xffffffff) may appear in the ifIndex field of the
ifTable for the first channelized T3 controller (CT3) of a 6-port CT3 line card that is installed in a
slot of a Cisco 10000 series. This situation causes the ifTable to lose its entries for all other CT3 (or
T3 and DSX3) controllers, making them unavailable for Simple Network Management Protocol
(SNMP) access.
In a situation in which some SNMP access tools treat the ifIndex values as signed integers, these
SNMP access tools may interpret the ifIndex value of 4,294,967,295 as its signed value of -1. When
a router walks tables that are indexed by an abnormal ifIndex value such as -1, loops may occur.
Conditions: This symptom is observed on a Cisco 10000 series that is configured for Route
Processor Redundancy Plus (RPR+) when a switchover occurs. The symptom may also occur when
a Stateful Switchover (SSO) occurs and the Cisco 10000 series software image that is loaded onto
the secondary Route Processor (RP) is a newer version than the software image that is running on
the primary RP, causing the router to default to RPR+ because of the mismatch between the two
software images on the RPs.
At least one channelized interface must be defined on any CT3 controller in order for the symptom
to occur.
You can reproduce the symptom in a simple configuration with two 6-port CT3 line cards in slots
6/0 and 7/0, when the only interface that is defined is a single T1 channel group, 6/0/3/1:0. Before
an RPR+ switchover, the output of the snmpwalk command indicates the following controller
indices:
interfaces.ifTable.ifEntry.ifIndex.3 = 3
interfaces.ifTable.ifEntry.ifIndex.4 = 4
interfaces.ifTable.ifEntry.ifIndex.5 = 5
interfaces.ifTable.ifEntry.ifIndex.6 = 6
interfaces.ifTable.ifEntry.ifIndex.7 = 7
interfaces.ifTable.ifEntry.ifIndex.8 = 8
interfaces.ifTable.ifEntry.ifIndex.9 = 9
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1948
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interfaces.ifTable.ifEntry.ifIndex.10 = 10
interfaces.ifTable.ifEntry.ifIndex.11 = 11
interfaces.ifTable.ifEntry.ifIndex.12 = 12
interfaces.ifTable.ifEntry.ifIndex.13 = 13
interfaces.ifTable.ifEntry.ifIndex.14 = 14
The associated data objects are also shown:
interfaces.ifTable.ifEntry.ifDescr.3 = T3 6/0/0
interfaces.ifTable.ifEntry.ifDescr.4 = T3 6/0/1
interfaces.ifTable.ifEntry.ifDescr.5 = T3 6/0/2
interfaces.ifTable.ifEntry.ifDescr.6 = T3 6/0/3
interfaces.ifTable.ifEntry.ifDescr.7 = T3 6/0/4
interfaces.ifTable.ifEntry.ifDescr.8 = T3 6/0/5
interfaces.ifTable.ifEntry.ifDescr.9 = T3 7/0/0
interfaces.ifTable.ifEntry.ifDescr.10 = T3 7/0/1
interfaces.ifTable.ifEntry.ifDescr.11 = T3 7/0/2
interfaces.ifTable.ifEntry.ifDescr.12 = T3 7/0/3
interfaces.ifTable.ifEntry.ifDescr.13 = T3 7/0/4
interfaces.ifTable.ifEntry.ifDescr.14 = T3 7/0/5
After the RPR+ switchover, the index list for the CT3 controllers contains only the following entry:
interfaces.ifTable.ifEntry.ifIndex.4294967295 = -1
The associated data object is shown only for the controller that is assigned to this index (that is, the
first controller on the line card on which an interface is assigned):
interfaces.ifTable.ifEntry.ifDescr.4294967295 = T3 6/0/0
Workaround: There is no workaround.
•
CSCeb10293
Symptoms: “IPC-3-APP_IPC_FAIL” error message may be printed when Active and Standby Route
Processors (RPs) are running different Cisco IOS software versions.
Conditions: This symptom occurs when at least one of the Cisco IOS releases is Cisco IOS
Release 12.0(23)S2 or an earlier release.
Workaround: Ensure that both images on Active and Standby RPs are running Cisco IOS
Release 12.0(23)S3 or later releases.
•
CSCeb16876
Symptoms: A Cisco router may generate a “SYS-2-GETBUF” message during the “Tag Input”
process and may subsequently reload unexpectedly.
Conditions: This symptom is observed when the router fragments a Multiprotocol Label Switching
(MPLS) packet.
Workaround: There is no workaround.
•
CSCeb19690
Symptoms: Packets may drop from an Engine 2 (E2) line card on which an outbound access control
list (ACL) is configured.
Conditions: This symptom is observed on a Cisco 12000 series when the access-list
access-list-number deny protocol any any global configuration command is configured on the E2
line card and you have entered 0 for the protocol argument.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(23)S4
The symptom does not occur on an E2 line card on which an inbound ACL and the access-list
access-list-number deny protocol any any global configuration command are configured and you
have entered 0 for the protocol argument.
Workaround: There is no workaround.
•
CSCeb21103
Symptoms: Multiprotocol Label Switching (MPLS) labels may be imposed erroneously on multicast
packets.
Conditions: This symptom is observed on a Cisco 10720 when multicast packets are transmitted via
Packet-over-SONET interfaces that are configured for MPLS.
Workaround: There is no workaround.
•
CSCeb29070
Symptoms: When you enter the copy running-config startup-config EXEC command or any other
command that affects the configuration, the copy process may not be successful or the configuration
may not be saved, and a “File table overflow” error message may be generated. After this situation
has occurred, any other file-operation attempts will fail too with a “File table overflow” error
message.
Conditions: This symptom is observed on a Cisco router that is configured with dual Route
Processors (RPs) and that runs Cisco IOS Release 12.0(23)S2 when you enter any command that
affects the configuration while the show running-config EXEC command is being executed, which
takes a relatively long time when the running configuration is large.
To clear the symptom, reload the router.
Workaround: Do not enter any command that affects the configuration while the show
running-config EXEC command is being executed.
•
CSCeb35694
Symptoms: When a small packet (a layer-2 packet that is equal to or smaller than 52 bytes, including
the layer-2 packet size, the layer-2 header, and the cyclic redundancy check [CRC]) enters a
Cisco 10720 and is fed back, one buffer element of the 128-byte Parallel Express Forwarding (PXF)
buffer pool is used but not released. This situation eventually causes the 128-byte buffer pool to be
depleted entirely. Because most of the control packets such as the IP routing protocol packets are
small packets and use the 128-byte buffer pool, most control plane functions stop working and
routing-protocol adjacencies go down when the 128-byte buffer pool is depleted, and finally, the
router stops forwarding traffic on all the interfaces.
Conditions: These symptoms are observed when a PXF feedback occurs, for example, when
multicast traffic is configured, or when a policy map is configured to feed back packets.
Workaround: Avoid PXF feedback. For example, properly configure the policy map. If PXF
feedback is inevitable, proactively monitor the 128-byte buffer pool via the output of the show
hardware pxf cpu buffers privileged EXEC command:
Router# show hardware pxf cpu buffers
FP buffers
pool size # buffer available allocate failures low buffer drops
---------------------------------------------------------------------------0 9344 1293 1293 0 0 1 1664 12930 12930 0 0 2 640 26746 26746 0 0 3 256 34072 34072
0 0 4 128 59934 49987 0 0 ^^^^^ Before the 128-byte buffer pool is depleted entirely,
reset the 128-byte buffer pool. Reload the microcode onto the PXF by entering the
microcode reload pxf privileged EXEC command. However, be careful, because by
reloading microcode onto the PXF, you may cause routing- protocol adjacencies to be
dropped and the PXF to stop forwarding traffic.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1950
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Resolved Caveats—Cisco IOS Release 12.0(23)S4
•
CSCeb43130
Symptoms: Packets may be dropped by a Cisco 12000 IP Services Engine (ISE) line card if they are
locally generated or forwarded in the slow pass by the line card, and if they exit the router through
an ATM Engine 0 line card (1-port OC-12 ATM or 4-port OC-3 ATM). For example, these packets
may be locally generated by ISE line card NetFlow export packets, Internet Control Message
Protocol (ICMP) echo replies, or ICMP unreachable messages that exit the router through an
Engine 0 ATM line card.
Packets that match the conditions listed below may be dropped. If they are NetFlow export packets,
they can be seen in the output of the show ip flow export command in the line “export packets were
dropped due to output drops.” If they are ICMP echo reply packets, pings will fail.
Conditions: The following three conditions exist simultaneously for the dropped packets:
– The ingress line card is any ISE line card or the packets are locally generated by this line card.
– The egress line card is any ATM Engine 0 line card (1-port OC-12 ATM or 4-port OC-3 ATM).
– The packets are forwarded by the ingress line card CPU in the slow pass, not by the forwarding
ASIC in the fast pass.
This caveat affects Cisco IOS Release12.0(21)S, Release 12.0(22)S, Release 12.0(23)S, and
Release 12.0(24)S. It does not apply to Release 12.0(25)S and later releases.
Workaround: There is no workaround.
•
CSCeb43936
Symptoms: Line Remote Defect Indicators (LRDIs) may be transmitted on both the working line
and the protect line after an automatic protection switching (APS) switchover has occurred.
Conditions: This symptom is observed when a 4-port OC-3 ATM line card is configured for APS
and a Loss of Signal (LOS) occurs.
Workaround: There is no workaround.
•
CSCeb45912
Symptoms: Ports on an 8-port OC-3 ATM line card may fail to come up and may generate the
following continuous SONET alarms:
%SONET-4-ALARM: ATM10/6: ~SLOF ~SLOS ~LAIS ~LRDI ~PAIS ~PRDI PLOP
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(23)S1.
Workaround: Reload the line card.
•
CSCeb50742
Symptoms: Layer 2 may forward an incorrect MAC address when a policed packet is rerouted to a
next-hop address.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with an Engine 4
plus line card when policy-based routing (PBR) is configured.
Workaround: There is no workaround.
•
CSCeb51428
Symptoms: A Cisco router may reload unexpectedly after you have modified an access control list
(ACL) and have entered the clear pxf interface privileged EXEC command.
Conditions: This symptom is observed on a Cisco 10000 series.
Workaround: Do not enter the clear pxf interface privileged EXEC command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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1951
Resolved Caveats—Cisco IOS Release 12.0(23)S4
•
CSCeb54951
Symptoms: A Performance Route Processor (PRP) on a Cisco 12000 series can reload with a
SIGTRAP exception after receiving a 1612 bytes or longer frame on an Ethernet0 or Ethernet1
interface.
Conditions: This symptom is observed only on the PRP. The Gigabit Route Processor (GRP) is not
affected.
Workaround: Isolate the PRP Ethernet ports to an isolated Ethernet segment.
•
CSCeb59097
Symptom: The interface index (ifIndex) values of the interfaces of a 4-port OC-48
Packet-over-SONET (POS) Engine 4 plus (E4+) line card may fail to be deregistered after an online
insertion and removal (OIR) has been performed, and the following error messages may be
generated:
%COPTMONMIB-3-ENTRYPRESENT: An entry is already present for the registering in terface
with ifIndex 2
%COPTMONMIB-3-ENTRYPRESENT: An entry is already present for the registering in terface
with ifIndex 3
%COPTMONMIB-3-ENTRYPRESENT: An entry is already present for the registering in terface
with ifIndex 4
%COPTMONMIB-3-ENTRYPRESENT: An entry is already present for the registering in terface
with ifIndex 5
Conditions: This symptom is observed on a Cisco 12410 that runs Cisco IOS Release 12.0(23)S3
and that is configured with the following line cards, neighbors, and peers:
– One 1-port OC-48 POS Engine 2 line card.
– One 4-port OC-48 POS E4+ line card that is configured for Multiprotocol Label Switching
(MPLS) and that is using Label Distribution Protocol (LDP) on all but one of its ports.
– Four Open Shortest Path First (OSPF) neighbors that advertise a total of 9000 label switched
paths (LSPs).
– Six Border Gateway Protocol (BGP) peers that advertise a total of 140,000 routes.
Workaround: There is no workaround.
•
CSCeb59165
Symptoms: A standby card may not be able to switch to the active state.
Conditions: This symptom is observed in a Redundancy Framework (RF) environment when ATM,
High-Level Data Link Control (HDLC), or Frame Relay clients synchronize data during the
“standby-bulk” state.
Workaround: There is no workaround.
•
CSCeb61694
Symptoms: A primary Performance Routing Engine 1 (PRE-1) may reload because of memory
corruption.
Conditions: This symptom is observed on a Cisco 10000 series that is configured with redundant
PREs when you enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on an interface of a 1-port Gigabit Ethernet line card.
Workaround: There is no workaround. Note that the symptom does not occur with a 1-port Gigabit
Ethernet half-height line card.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1952
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•
CSCeb66997
Symptoms: A Cisco 10720 may reload.
Conditions: This symptom is observed under rare circumstances when a SONET bit error rate (BER)
is reported.
Workaround: There is no workaround.
•
CSCeb67098
Symptoms: When a Weighted Random Early Detection (WRED) configuration is present and a
policy map with WRED configuration is applied to any interface of a Cisco 10720 router, the
Parallel Express Forwarding (PXF) Intelligent Protection Switching (IPS) buffer may leak. The
“toaster IPC buffer” counter can be observed with the show buffer command.
When the buffer pool is empty, the following error message can be observed, attempts to Telnet into
the router may fail, and the Cisco IOS software may reload:
%CAMR_QUEUE_CFG_GENERAL-3-EREVENT: Error @
../toaster/camr_rp/camr_tt_queue_cfg.c:463
-Traceback= 500DB204 500DB2BC 503954D8 503986EC 50330A58
%SYS-2-MALLOCFAIL: Memory allocation of 18196 bytes failed from
0x502C5BD0, alignment 32
Pool: I/O Free: 552 Cause: Not enough free memory
Alternate Pool: None Free: 0 Cause: No Alternate pool
-Process= "Pool Manager", ipl= 0, pid= 5
-Traceback= 50308EEC 5030A8E8 502C5BD8 5031DD3C 5031DE7C
Conditions: These symptoms occur only when a WRED configuration is present and a policy map
with WRED configuration is applied to any interface of a Cisco 10720 router. The higher the rate at
which the Route Processor (RP) sends packets to PXF, the faster the PXF IPC buffer leaks. The
leaking is usually very slow, and it takes weeks to drain the buffer pool.
Workaround: Remove all policy maps that include the random-detect interface configuration
command from all interfaces.
•
CSCeb68608
Symptoms: An Engine 2 line card that is configured with Virtual Private Network (VPN)
routing/forwarding (VRF) instances and Sampled NetFlow (SNF) may reload.
Conditions: This symptom is observed on a Cisco 12000 series when you enter the no mpls ip global
configuration command to remove Multiprotocol Label Switching (MPLS) from the configuration.
Workaround: Remove SNF from the configuration before you enter the no mpls ip global
configuration command.
•
CSCeb68913
Symptoms: An Engine 4 line card may reload unexpectedly.
Conditions: This symptom is observed on a Cisco 12000 series when you enter the clear cef
linecard EXEC command to clear Cisco Express Forwarding (CEF) from the line card.
Workaround: There is no workaround.
•
CSCeb70227
Symptoms: In a tag switching-to-IP switching scenario, the value of the precedence field of an IP
header may change. This behavior is incorrect in Pipe mode.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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1953
Resolved Caveats—Cisco IOS Release 12.0(23)S4
Conditions: This symptom is observed on a Cisco 12000 series when the following conditions are
present:
– The router is part of an MPLS label-switched path (LSP).
– The traffic through the LSP has its label removed from the packet (also referred to as
“popping”).
– The traffic is received on an Enhanced Services (ES, also referred to as Engine 4 plus) line card.
Workaround: Deconfigure and reconfigure the tag switching-to-IP switching configuration and the
MPLS traffic engineering (TE) tunnels on the interface of the ES line card.
•
CSCeb70527
Symptoms: Some policy-based routing (PBR) rules may cause a Route Processor (RP) to reload
unexpectedly with a bus error. When a route map that causes the RP to reload is saved to the startup
configuration, the router may not boot up.
Conditions: This symptom is observed on a Cisco 12000 series when the PBR rules are applied to
the interfaces of an IP Services Engine (ISE) line card and occurs usually when the route map is
modified after it has already been applied to the interfaces.
Workaround: Remove PBR from the interfaces of the ISE line card.
If you are unable to boot the router, enter a break signal on the console during the bootup procedure
and configure the configuration register to ignore the startup configuration. To do so, follow the
steps that are described in the Password Recovery Procedure for the Cisco 12000 Series Routers at
the following location:
http://www.cisco.com/warp/public/474/pswdrec_12000.shtml
•
CSCeb70543
Symptoms: The command-line interface (CLI) may pause indefinitely after you perform a manual
online insertion and removal (OIR) of the standby Performance Route Processor (PRP).
Conditions: This symptom is observed on a Cisco 12410 that runs the c12kprp-p-mz image of
Cisco IOS Release 12.0(23)S3.
Workaround: Reload the active PRP.
•
CSCeb73758
Symptoms: When you configure a Cisco 10000 series, messages similar to the following ones may
appear, and a VLAN may not be enabled:
%GENERAL-3-EREVENT: c10k_dot1q_vlan_enable: No tt_info
-Traceback= 60142770 60142A50 603AEC40 603AE06C 603ADCE0 6036EAD8 60193BA8 60380DD4
60B85BEC 60B861D4 603D6FAC 603D6F98
%GENERAL-3-EREVENT: get_injection_vcci: no info for VLAN ID 972
-Traceback= 600DF180 6009AF2C 6009B178 603A831C 604BB804 605013F0 605018A8 605014E0
602B8D84 602B94A4 604F2DC0 604F33F4 60504DB4 60504BA4 60504984 6052351C
%GENERAL-3-EREVENT: get_injection_vcci: no info for VLAN ID 972
-Traceback= 600DF180 6009AF2C 6009B178 603A831C 604BB804 605013F0 605018A8 60504E0
602B8D84 602B94A4 604F2DC0 604F33F4 60504DB4 60504BA4 60504984 6052351C
Conditions: This symptom is observed on a Cisco 10000 series when you change the encapsulation
of a LAN subinterface to dot1q encapsulation while the subinterface is shut down.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(23)S4
When the symptom occurs, the output of the show hardware pxf cpu subblocks privileged EXEC
command lists “noSB” for the affected subinterface, as is indicated in the following example:
Router# show hard pxf cpu sub | i GigabitEthernet4
GigabitEthernet4/0/0
up
12000 4
PXF
1
81C4A800 4
GigabitEthernet4/0/0.500
administ 12000 4
PXF
1
81C4A800 noSB
Workaround: Change the encapsulation of the subinterface to dot1q when the subinterface is not
shut down. The state of the main interface is irrelevant. After you change the encapsulation, you can
shut down the subinterface again.
When the subinterface is created while the main interface is shut down, the subinterface and the
VLAN do not function properly. Perform the following steps to recover the VLAN:
•
1.
Ensure that the subinterface is not shut down.
2.
(Optional) Enter the no encapsulation dot1q native subinterface configuration command.
3.
Remove the subinterface.
4.
Recreate the subinterface.
5.
Change the encapsulation back to dot1q.
CSCeb78329
Symptoms: After a Route Processor Redundancy Plus (RPR+) switchover occurs, the deletion of an
existing permanent virtual circuit (PVC)/permanent virtual path (PVP) fails. This situation prevents
you from recreating the same PVC/PVP. You can create a new PVC/PVP, but once you delete it, you
cannot recreate it because the PVC remains in the active state.
Conditions: This symptom is observed on a Cisco 10000 series that runs Cisco IOS Release 12.0 S
or Release 12.0 SX.
Workaround: There is no workaround. To enable the router to return to normal operation, reload the
router.
•
CSCeb78610
Symptoms: The interface protocol may not come up for a 1-port OC-12 Packet-over-SONET (POS)
line card when the encapsulation frame-relay interface configuration command is configured.
Conditions: This symptom is observed on a Cisco 10000 series when the 1-port OC-12 POS line card
is connected back-to-back to another line card in another Cisco 10000 series.
Workaround: There is no workaround.
•
CSCeb82737
Symptoms: When you shut down the last port of an 8-port Fast Ethernet half-height line card (port
7), all the other ports on the line card may stop transmitting traffic.
Conditions: This symptom is observed on a Cisco 10000 series.
Workaround: Do not shut down port 7. If port 7 is shut down, enter the no shutdown interface
configuration command on the interface to enable traffic to resume on the other interfaces.
•
CSCeb83784
Symptoms: The following error message may appear for a 3-port Gigabit Ethernet Engine 2 line
card, and the line card may reset:
%LCGE-3-SOP_BAD_PACKET: Found corrupt pkts in tx-sop-sram.
Conditions: This symptom is observed on a Cisco 12000 series that runs Cisco IOS
Release 12.0(23)S3.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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1955
Resolved Caveats—Cisco IOS Release 12.0(23)S3
•
CSCeb86866
Symptoms: Traffic forwarding may not be fully restored when you remove a deny input access
control list (ACL) from an interface of a 16-port OC-3 Packet-over-SONET (POS) IP Services
Engine (ISE) line card.
Condition: This symptom is observed on a Cisco 12410 that is configured with a 16-port OC-3 POS
ISE line card when unicast Reverse Path Forwarding (uRPF) is configured on the interface from
which you remove the deny input ACL.
Workaround: There is no workaround. To restore traffic forwarding to its proper performance, reload
the line card.
•
CSCec10557
Symptoms: When you configure unicast Reverse Path Forwarding (uRPF) on a 1-port OC-48
Packet-over-SONET (POS) Engine 2 line card while traffic is passing through the interface, traffic
forwarding may stop.
Conditions: This symptom is observed on a Cisco 12416 that runs the gsr-p-mz image of Cisco IOS
Release 12.0(23)S3, that is configured with three 1-port OC-48 POS Engine 2 line cards, and that is
configured with three Border Gateway Protocol (BGP) peers.
Workaround: To restore traffic forwarding, reload the line card. To prevent the symptom from
occurring, enter the shutdown interface configuration command on the interface before you
configure uRPF. Then, enter the no shutdown interface configuration command on the interface.
Alternate Workaround: Ensure that uRPF is configured in the startup configuration file before you
boot up the router.
•
CSCin30562
Symptoms: After a switchover occurs, an active Route Processor (RP) that is operating in the Route
Processor Redundancy plus (RPR+) mode may not be able to switch Layer 2 Tunneling Protocol
(L2TP) version 3 packets using distributed Cisco Express Forwarding (dCEF) (in the dCEF mode
and may punt them to the RP CEF mode).
Conditions: This symptom is observed on the RP of a Cisco 7500 series that is running Cisco IOS
Release 12.0(24)S.
Workaround: Disable and reenable dCEF.
•
CSCin39123
Symptoms: A Cisco router that is configured for Any Transport over Multiprotocol Label Switching
(AToM) may send AToM packets that are missing control words, even though control-word
imposition is enabled. When another Cisco router receives such malformed packets, the router does
not handle these packets properly during disposition.
Conditions: This symptom may occur on all Cisco routers that employ software switching with
AToM enabled. This symptom has specifically been observed on a Cisco 7200 series, Cisco 7400
series, and Cisco 7500 series that are configured for AToM.
On a Cisco 7200 series router that is processing a heavy traffic load, the reception of malformed
packets may cause the router to pause indefinitely.
Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(23)S3
Cisco IOS Release 12.0(23)S3 is a rebuild release for Cisco IOS Release 12.0(23)S. The caveats in this
section are resolved in Cisco IOS Release 12.0(23)S3 but may be open in previous Cisco IOS releases.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Basic System Services
•
CSCdy74705
Symptoms: A memory corruption may occur on a Network Processing Engine 200 (NPE-200).
Conditions: This symptom is observed on the NPE-200 of a Cisco 7200 series router. This symptom
is observed when a high amount of traffic is present on the router and when there are packet sizes
that are greater than 1524 bytes in size. The occurrence of this symptom may be related to port
adapter arrangements.
Workaround: Rearrange the port adapters or upgrade to Cisco IOS Release 12.0(24)S or a later
release.
•
CSCea22886
Symptoms: When an entry in the ciscoPingTable MIB variable is set to be valid, high memory
utilization may occur gradually because memory is not released by the “dead*” process of a Simple
Network Management Protocol (SNMP) ping.
Conditions: This symptom is observed on a Cisco 12000 series after the router has been upgraded
from an earlier Cisco IOS release to Cisco IOS Release 12.2(23)S.
Workaround: Exclude the ciscoPingTable MIB variable from the configuration by entering the
snmp-server view view name ciscoPingTable excluded global configuration command.
•
CSCea36491
Symptoms: When a Telnet session is made to a router after a VTY session pauses indefinitely, the
user in the Telnet session may not be able to enter the configuration mode. When these symptoms
occur, interfaces may enter the wedged state with Simple Network Management Protocol (SNMP)
traffic.
Conditions: This behavior is observed on ATM and Packet over SONET (POS) interfaces. This
behavior is not platform-specific.
Workaround: Disable Simple Network Management Protocol (SNMP) configuration traps by
entering the no snmp-server enable traps config global configuration command.
•
CSCeb08027
Symptoms: The snmp mib target list global configuration command is not displayed when the
show running-config EXEC command is entered on the secondary Performance Routing Engine
(PRE). However, the snmp mib target list global configuration command is displayed when the
show startup-config EXEC command is entered on the PRE.
Conditions: This symptom is observed on the PRE of a Cisco 10000 series.
Workaround: There is no workaround.
IP Routing Protocols
•
CSCdu53656
A Cisco device running IOS and enabled for the Border Gateway Protocol (BGP) is vulnerable to a
Denial of Service (DOS) attack from a malformed BGP packet. The BGP protocol is not enabled by
default, and must be configured in order to accept traffic from an explicitly defined peer. Unless the
malicious traffic appears to be sourced from a configured, trusted peer, it would be difficult to inject
a malformed packet. BGP MD5 is a valid workaround for this problem.
Cisco has made free software available to address this problem. For more details, see the advisory
at http://www.cisco.com/warp/public/707/cisco-sa-20040616-bgp.shtml.
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•
CSCdw82270
Symptoms: When the default-information originate router configuration command is entered on a
Cisco 12000 series via the Border Gateway Protocol (BGP), the default route is learned correctly
but is entered incorrectly into the BGP routing table. This behavior may cause the Cisco 12000
series to have operating issues with other routers because the Cisco 12000 series does not have a
correct default route.
Conditions: This symptom is observed on a Cisco 12000 series.
Workaround: Perform either of the following steps:
– Enter a static default route.
– Configure an access control list (ACL) to prevent packets from being propagated from the
incorrect default route.
•
CSCdz09296
Symptoms: Transit traffic that uses Open Shortest Path First (OSPF) routes may be briefly
interrupted after consecutive switch-over. This affects only OSPF configurations with
message-digest authentication.
Conditions: This symptom is observed on Cisco routers that are running Cisco IOS
Release 12.0(22)S when the following conditions are present:
The message-digest authentication is configured for OSPF.
More than one Route Processor (RP) switchover occurs within minutes of each other.
Workaround: There is no workaround. Traffic resumes without user intervention. To prevent future
traffic interruptions on subsequent switchovers, disable the message-digest authentication for OSPF.
•
CSCdz10505
Symptoms: When a neighbor under virtual route forwarding (VRF) is configured using the bgp
graceful-restart router configuration command, the session does not begin. A notification
regarding wrong OPEN message is generated.
Conditions: This symptom is observed only when the router is configured using the bgp
graceful-restart router configuration command.
Workaround: There is no workaround.
•
CSCdz24314
Symptoms: A Border Gateway Protocol (BGP) session reset occurs because of a notification that
indicates a defective OPEN message.
Conditions: This symptom is observed when using the both option in the following command in
router configuration mode:
neighbor ip-address [capability] orf prefix-filter [receive | send | both]
Workaround: Configure only the receive or send options of the neighbor-orf prefix-filter router
configuration command.
•
CSCea13075
Symptoms: The Multi Exit Discriminator (MED) that is received from a confederation external peer
may be ignored in best path selection. The output of the show ip bgp longer-prefixes EXEC
command does not indicate that any MED values were received.
Conditions: This symptom is observed when Multiprotocol Label Switching (MPLS) Virtual Private
Network (VPN) configurations are present.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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•
CSCea28131
A Cisco device running IOS and enabled for the Border Gateway Protocol (BGP) is vulnerable to a
Denial of Service (DOS) attack from a malformed BGP packet. The BGP protocol is not enabled by
default, and must be configured in order to accept traffic from an explicitly defined peer. Unless the
malicious traffic appears to be sourced from a configured, trusted peer, it would be difficult to inject
a malformed packet. BGP MD5 is a valid workaround for this problem.
Cisco has made free software available to address this problem. For more details, see the advisory
at http://www.cisco.com/warp/public/707/cisco-sa-20040616-bgp.shtml.
•
CSCea32226
Symptoms: A router may reload when the show ip bgp neighbors EXEC command is entered.
Conditions: This symptom is observed if the show ip bgp neighbors EXEC command is entered
while the neighbor soft-reconfiguration router configuration command is enabled, or when Border
Gateway Protocol (BGP) paths are dampened.
Workaround: Disable the neighbor soft-reconfiguration router configuration command or avoid
dampening the BGP paths.
•
CSCea42500
Symptoms: If the default-information originate router configuration command is entered on the
Virtual Private Network (VPN) routing/forwarding (VRF) instance of a Cisco 12000 series that has
the address-family ipv4 vrf vrf-name router configuration command configured using the Border
Gateway Protocol (BGP), the default route is learned correctly but the default route is entered
incorrectly in the BGP routing table. This behavior may result in unexpected behavior on the other
router if the other router does not have a correct default route.
The default static route of the VRF is not advertised by BGP after the default static route is
configured under the VRF, and BGP may advertise the incorrect default route that is in the BGP
routing table.
Conditions: This symptom is observed on a Cisco 12000 series that is running BGP.
Workaround: Perform either of the following steps:
– Enter a static default route under the VRF configuration.
– Configure an access control list (ACL).
•
CSCea64725
Symptoms: If a peer group is slow to establish and comes up while other members of the peer group
are converging, the recently established member may not advertise the routes that were sent to the
other members.
Conditions: This symptom occurs only if the new peer group member comes up while the other
members of a peer group are converging. This symptom does not occur if the new peer group
member comes up after the other members of the peer group have finished converging.
Workaround: The routes can be readvertised by entering the clear ip bgp peer-group-name soft out
privileged EXEC command for any peer that has missing routes.
•
CSCeb00172
Symptoms: When the neighbor {ip-address | peer-group-name} default-originate router
configuration command is used with a peer group, peers that belong to that peer group come up at
a different time from when the Border Gateway Protocol (BGP) is formatting updates. Because of
this behavior, the router may not advertise all routes to members of the peer group.
Conditions: This symptom is observed with IP version 4 (IPv4) unicast and Virtual Private Network
(VPN) routing/forwarding (VRF) address family (AF) packets.
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Workaround: There is no workaround.
•
CSCeb00180
Symptoms: Border Gateway Protocol (BGP) update generation may pause indefinitely when BGP
is converging.
Conditions: This symptom may occur under any of the following six conditions when BGP is
converging:
1.
When non-peer-group peer sessions flap or when the clear ip bgp address privileged EXEC
command is entered several times for a non-peer-group peer.
2.
When the clear ip bgp * soft out privileged EXEC command is entered repeatedly in rapid
succession.
3.
When peers are moved in or out of peer groups.
4.
When routers that are configured with unicast assured forwarding (AF) and AF only are
reloaded.
5.
When all members of a peer group are cleared by performing either a hard reset or a soft reset.
In this situation, only the peer group is affected.
6.
When some routes are advertised to or withdrawn from the router while the router is converging,
some peers in a peer group may not receive all the updates.
Workaround: There is no workaround for conditions 1 through 5.
To recover from condition 6, enter the clear ip bgp neighbor-address soft out privileged EXEC
command. For the neighbor-address argument, use the IP address of the peer that did not receive all
of the updates.
ISO CLNS
•
CSCea00846
Symptoms: After a switchover, the Intermediate System-to-Intermediate System (IS-IS) takes about
10 minutes to fully recover and to install routes in the IP routing table.
Conditions: This symptom is observed on a Cisco 12000 series configured with IS-IS. The amount
of time required for the Gigabit Ethernet (GE) interface to load after a switchover is very close to
the amount of time of the IS-IS adjacency timeout. The device under test (DUT) is the designated
router.
Workaround: There is no workaround.
Miscellaneous
•
CSCdx59003
Symptoms: A Cisco 12000 series router may report incorrect environmental values, as the following
environmental logs display:
%ENV_MON-2-VOLTAGE: MBUS 5V supply (slot 1) volts has reached SHUTDOWN level at 5 m(V)
%ENV_MON-2-TEMP: Hotpoint temp sensor (slot 17) temperature has reached SHUTDOWN level
at 756(C)
%ENV_MON-2-VOLTAGE: Card 3.3v supply (slot 17) volts has reached CRITICAL level at
2560 m(V)
Although the environmental logs indicate that the shutdown level has been reached, the router does
not shut down the line cards for which the incorrect environmental values are reported.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S3, Release 12.0(21)S5, Release 12.0(21)ST2, or Release 12.0(22)S.
Workaround: There is no workaround.
•
CSCdx61684
Symptoms: The traffic on a Cisco 12000 series 3-port Gigabit Ethernet line card (3GE-GBIC-SC)
is stopped after the shutdown interface configuration command followed by the no shutdown
interface configuration command is entered on the interface while there is a traffic load on the
interface.
Conditions: This symptom is observed on a 3GE-GBIC-SC line card.
Workaround: Configure autorenegotiation, or reload the 3GE-GBIC-SC line card.
•
CSCdy51183
Symptoms: A router that is running cell-mode tag switching or Multiprotocol Label Switching
(MPLS) on a label controlled ATM (LC-ATM) interface may reload when it receives a more specific
prefix for a label mapping or binding than the one that is already allocated. For example, the router
may reload when it receives the prefix 10.1.1.0/24 if a binding was already allocated for 10.1.1.1/32
on the basis of the routing entry 10.1.0.0/16.
Conditions: This symptom is observed on an Edge Label Switch Router (ELSR) or Label Switch
Controller (LSC).
Workaround: There is no workaround for an ELSR. To prevent an LSC from reloading, disable the
headend label virtual circuits (LVCs) by entering the tag-switching atm disable-headend-vcs
global configuration command.
•
CSCdy56799
Symptoms: Spurious access errors may occur on a Cisco 7500 series router configured with
distributed Cisco Express Forwarding (dCEF) and Web Cache Communication Protocol (WCCP).
Conditions: This symptom is observed on Cisco 7500 series router configured with dCEF and
WCCP.
Workaround: Disable dCEF on the interfaces that are facing the web cache engines where the
spurious access errors occur so that incoming WCCP generic routing encapsulation (GRE) packets
are punted to the Route Processor (RP) and CEF switched.
For more information about spurious access errors, see the Cisco document at the following
location:
http://www.cisco.com/warp/public/63/spuraccess.html
•
CSCdy67706
Symptoms: A switchover from the working interface to the protect interface may take a long time.
Conditions: This symptom is observed on a Cisco 10000 series router when the SONET Single
Router APS (SR-APS) feature is enabled.
Workaround: A temporary solution is to configure the protect interface as the working interface.
•
CSCdy89749
Symptoms: A Gigabit Ethernet Interface Processor plus (GEIP+) may report many alignment errors
and the CPU utilization may stay at 100 percent.
Conditions: This symptom is observed on a Cisco 7500 series router.
Workaround: There is no workaround.
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•
CSCdz04297
Symptoms: A router may pause indefinitely instead of restarting.
Conditions: This symptom is observed when the router is handling invalid addresses in the cached
address space.
Workaround: There is no workaround.
•
CSCdz22591
Symptoms: Resource Reservation Protocol (RSVP) hello may incorrectly declare lost
communications with a neighbor, and fast reroute may be triggered.
Conditions: This symptom is observed when RSVP is configured on a Packet over SONET (POS)
interface with a hello interval of 60 milliseconds or less on a Cisco router that is running Cisco IOS
Release 12.0(24)S. This symptom does not exist when hello is configured on an Ethernet interface.
Workaround: Configure hello intervals longer than 60 milliseconds.
•
CSCdz37875
Symptoms: Traceback messages may be detected when a user checks the log file of a standby
Performance Routing Engine (PRE).
Conditions: This symptom is observed on a router that has a 6-port OC-3 Packet over SONET (POS)
line card.
Workaround: There is no workaround.
•
CSCdz46443
Symptoms: An ingress line card may reload after the no shutdown interface configuration command
is entered on the line card while traffic is present.
Conditions: This symptom is observed in a Multiprotocol Label Switching (MPLS) tunnel head that
has a 1-port edge service (ES) Packet-over-SONET (POS) OC- 192c/STM-64 line card configured
on both the ingress and egress line cards. This symptom is observed when the ip cef accounting
per-prefix non-recursive global configuration command is configured.
Workaround: There is no workaround.
•
CSCdz59683
Symptoms: After the ALPHA application-specific integrated circuit (ASIC) is reset because of error
recovery (that may be caused by parity errors in ALPHA memory), the port or fetch descriptors that
select correct threads in ALPHA microcode are not programmed correctly. This behavior may
prevent certain configured features, such as IP version 6 (IPv6) or IP Virtual Private Network (VPN)
routing/forwarding (VRF), from working correctly.
Conditions: This symptom is observed on the line card of a Cisco 12000 series.
Workaround: Reset the line card.
•
CSCdz63442
Symptoms: Link utilization may be lower than expected.
Conditions: This symptom is observed on a Cisco 10000 series router that is running Cisco IOS
Release 12.0(23)S1 when class-based weighted fair queueing (CBWFQ) is configured on multiple
VLANs.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Workaround: Try one or more of the following options to improve the link utilization:
•
1.
Reduce the number of VLANs that are configured.
2.
Send burstier traffic. (Doing so will most likely be more effective on higher bandwidth
interfaces).
3.
Do not configure maximum utilization parameters on any queues.
CSCdz66463
Symptoms: An ATM interface does not come up after a Cisco 10000 series router has reloaded.
Conditions: This symptom is observed on a Cisco 10000 series router that is running Cisco IOS
Release 12.0(23)S1.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected interface.
•
CSCdz67600
Symptoms: An Engine 4 Plus (E4+) Packet-over-SONET (POS) line card may reload when the
access control list (ACL) of a port is changed.
Conditions: This symptom is observed when the ACL of a port is changed when there already is an
ACL configured on the port of an E4+ POS line card.
Workaround: There is no workaround.
•
CSCdz69846
Symptoms: An Engine 4 plus (E4+) line card may reload and display the following error messages
in the log or crash info:
%TX192-3-CPUIF: Error=0x100
%TX192-3-CPUIF_ERR: Underrun Error: Read Pointer crosses Write Pointer.
Conditions: This symptom is observed on the E4+ line card of a Cisco 12400 series that is
performing multicast packet fragmentation.
Workaround: There is no workaround.
•
CSCdz71127
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
•
CSCdz72673
Symptoms: A Cisco router that is functioning as a Multiprotocol Label Switching (MPLS) Virtual
Private Network (VPN) provider edge (PE) router may reload with an “address error” message.
Conditions: This symptom is observed at bootup time when the PE and customer edge (CE)
interfaces are coming up. The symptom occurs when a locally learned VPN routing/forwarding
(VRF) route temporarily loses its local label. This condition leads to some data structures being
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Resolved Caveats—Cisco IOS Release 12.0(23)S3
cleaned up but still retaining references to the local label. It may also occur after bootup in the case
of interface flaps. The reload is not a common occurrence, however, and may need additional
triggers.
A list of the affected releases can be found at
http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCdv49909. Cisco IOS
releases that are not listed in the “First Fixed-in Version” field at this location are not affected.
Workaround: There is no workaround.
•
CSCea00096
Symptoms: Packet throttling is activated because of congestion even when it is not configured. This
behavior is indicated by the following error message:
%LC_CX3-4-THROTTLE: Packet throttling activated due to congestion
Conditions: This symptom is observed on a Cisco 12416 router that is configured with 200 Border
Gateway Protocol (BGP) peers and that has three 6- port channelized T3 (6xCT3) line cards. Each
of the line cards is configured with an even distribution of about 1500 Frame Relay subinterfaces.
Workaround: There is no workaround.
•
CSCea00954
Symptoms: IP multicast hardware counter memory is not freed on an Engine 4 (E4) or Engine 4 Plus
(E4+) line card after multicast routes are cleared from the routing table.
Conditions: This symptom occurs only when the E4 or E4+ line card runs out of mtrie node memory.
The line card will run out of mtrie memory when there are more routes on the router than the line
card can handle.
Workaround: There is no workaround.
•
CSCea02355
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
•
CSCea03424
Symptoms: An OC-48 Packet-over-SONET (POS) interface may flap immediately after a high
availability (HA) Fast Software Upgrade (FSU).
Conditions: This symptom is observed on a Cisco 10000 series when an HA FSU is performed from
an image of Cisco IOS Release 12.0(23)S1 to an image of Release 12.0(23)S2.
Workaround: There is no workaround.
•
CSCea04762
Symptoms: Some export packets sent from an Engine 4+ (E4+) line card are not received by the
NetFlow collector.
Conditions: This condition is observed on the E4+ line card when the export packets are exported
out of a traffic engineering (TE) or tag interface and the router is running Cisco IOS
Release 12.0(22)S2.
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Workaround: Export the packets out of the non-TE or non-tag interface. This means that export
packets must be sent out as IP packets from the E4+ line card.
•
CSCea10156
Symptoms: An Engine 4 plus (E4+) line card may reload unexpectedly.
Conditions: This symptom is observed when more than one adjacency is established across the
interfaces of the E4+ line card while the ip cef accounting per-prefix non-recursive global
configuration command is enabled. This symptom may occur when there is no traffic present on the
line card.
Workaround: Disable the ip cef accounting per-prefix non-recursive global configuration
command.
•
CSCea10890
Symptoms: The output of the show ip interface EXEC command does not display the number of
Reverse Path Forwarding (RPF) packet drops but indicates a value of “0” for the number of RPF
packet drops. However, the global RPF count in the output of the show ip traffic | inc drop EXEC
command is correct.
Conditions: This symptom is observed on a Cisco 10000 series that has Parallel Express Forwarding
(PXF) switching enabled.
Workaround: There is no workaround. This is caveat has been closed.
•
CSCea12157
Symptoms: The following error message may be observed on a line card:
%SLOT n: .... : %LC-3-ERRRECOVER: Corrected a transient error on line card.
This error may be observed even though an actual hardware error has not occurred on the line card.
If a hardware error does occur, it will generate additional error messages to identify the source of
the hardware error in addition to the error message listed above.
Conditions: This symptom may be observed on a Cisco Engine 0 line card when a feature that
requires a micro code change is configured.
Workaround: There is no workaround. Ignore the error message.
•
CSCea14108
Symptoms: Pings from a customer edge (CE) router may fail in an Any Transport over Multiprotocol
Label Switching (AToM) network.
Conditions: This symptom is observed when Ethernet over Multiprotocol Label Switching
(EoMPLS) AToM is configured.
Workaround: There is no workaround.
•
CSCea14348
Symptoms: The integrity of the payload may not be retained on a Cisco 10700 series that is running
Cisco IOS Release 12.0(24)S.
Conditions: This symptom is observed on Cisco 10700 series that is operating in the Ethernet over
Multiprotocol Label Switching (EoMPLS) port mode with a Packet over SONET (POS) interface
that is connected to a Multiprotocol Label Switching (MPLS) backbone.
Workaround: There is no workaround.
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•
CSCea25707
Symptoms: A Cisco router may reload because of a software condition when running the LDP-MIB
MIB. The router reloads because of a process watchdog timeout in the “SNMP ENGINE” process
and logs an entry similar to the following one and logs a traceback:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = SNMP ENGINE.
%Software-forced reload
Unexpected exception, CPU signal 23, PC = 0x606F1FC4 ... Cause 00000024 (Code 0x9):
Breakpoint exception
Conditions: This symptom is observed after the router ID has been changed and when Label
Distribution Protocol (LDP) sessions have been added or removed.
Workaround: Do not change the router ID. If the router ID has been changed, do not run the
LDP-MIB MIB.
•
CSCea27683
Symptoms: An Engine 4 (E4) line card may reload after it displays the following error messages:
%TX192-3-PAM_MODULE: status = 0x2, mask= 0x3F - MODULE: Error signal from PIM module.
-Traceback=
%TX192-3-PAM_PIM: status = 0x3D6, mask= 0x1A1 - PIM: header start offset >= 16kB.
-Traceback=
Conditions: These symptoms are observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(24)S under the following conditions:
– IP traffic is sent from the IP Services Engine (ISE) Engine 3 (E3) line card to Engine 4 (E4) or
Engine 4 plus (E4+) line cards.
– The tag-switching ip interface configuration command is enabled on the E4 and E4+ line cards.
– The IP packets are 78 bytes in size.
– An Intermediate System-to-Intermediate System (IS-IS) link flap causes a change in the
behavior of forwarded IP traffic that arrives at the ISE line card from one incoming link to two
outgoing links or from two incoming links to one outgoing link in which one of the active
outgoing links is an E4 or E4+ line card.
Workaround: There is no workaround.
•
CSCea28471
Symptoms: A Versatile Interface Processor (VIP) may reload.
Conditions: This symptom is observed on a VIP if Multiprotocol Label Switching (MPLS), Egress
Netflow, and distributed Cisco Express Forwarding (dCEF) are configured.
Workaround: Disable DCEF or the Egress Netflow.
•
CSCea28914
Symptoms: A Fabric Interface ASIC (FIA) controller halt condition may be observed on the
Engine 4 (E4) or Engine 4 plus (E4+) line card of a Cisco 12410.
Conditions: This symptom is observed when the hw-module slot 17 shut EXEC command is
entered while a primary Clock Scheduler Card (CSC) is installed in slot 17 of the E4 or E4+ line
card of a Cisco 12410. This symptom is observed when the Cisco 12410 is running Cisco IOS
Release 12.0(21)S6.
Workaround: Avoid entering the hw-module slot 17 shut EXEC command.
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•
CSCea32240
Cisco products running IOS contain vulnerabilities in the processing of H.323 messages, which are
typically used in packetized voice or multimedia applications. Features such as NAT and IOS
Firewall must inspect H.323 messages and may be vulnerable as well. A test suite has been
developed by the University of Oulu to target this protocol and identify vulnerabilities.
Support for the H.323 protocol was introduced in Cisco IOS Software Release 11.3T, and all later
Cisco IOS releases are affected if configured for various types of Voice/Multimedia Application
support. The vulnerabilities can be exploited repeatedly to produce a denial of service (DoS).
There are workarounds available that may mitigate the impact, but these techniques may not be
appropriate for use in all customer networks.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040113-h323.shtml.
•
CSCea32479
Symptoms: It may take a long time for a Cisco 12000 series to remove 250,000 Virtual Private
Network version 4 (VPNv4) entries from an Engine 3 (E3) line card. While the router removes the
VPNv4 entries, new VPNv4 entries cannot be updated on the line card.
Conditions: This symptom is observed when the router handles a large number of VPNv4 entries on
its line cards (more than 80,000) and when a Border Gateway Protocol (BGP) session flaps (the
session remains down for a few minutes). This behavior causes the router to remove all VPNv4
entries and repopulate the VPNv4 entries a few minutes later.
Workaround: There is no workaround.
•
CSCea33501
Symptoms: Parallel Express Forwarding (PXF) reloads with the “0x680” software exception type in
column 5 (T1RxC1).
Conditions: This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(21)ST5 but may also occur in Release 12.0 S.
Workaround: There is no workaround.
•
CSCea35292
Symptoms: When Multiprotocol Label Switching (MPLS) traffic or MPLS Virtual Private Network
(VPN) traffic is being forwarded by a Cisco 10720 router, about 50 percent of multicast traffic will
be punted to a Route Processor (RP) and forwarded by the RP. The expected behavior is that
multicast traffic should be forwarded by Parallel Express Forwarding (PXF) as long as a multicast
route (mroute) entry exists. If many packets are punted to the RP, and the RP queue is congested,
some of the multicast traffic that is being punted to the RP will be dropped. For example, multicast
traffic may be dropped from a multicast application such as video or TV broadcast.
Conditions: This symptom is observed on a Cisco 10720 router that is running Cisco IOS
Release 12.0(22)S, Release 12.0(23)S1, or Release 12.0(24)S when the following conditions are
met:
– The router forwards MPLS or MPLS VPN traffic and multicast traffic.
– The RP queue is congested.
Workaround: Stop the MPLS or MPLS VPN traffic.
•
CSCea38449
Symptoms: Traffic may not be forwarded to an egress line card if an uncorrected parity error is
detected.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1967
Resolved Caveats—Cisco IOS Release 12.0(23)S3
Conditions: This symptom is observed on an Engine 3 (E3) IP Services Engine (ISE) line card of a
Cisco 12000 series.
Workaround: Reload the microcode of the line card after the error recovery process occurs.
•
CSCea42366
Symptoms: A corrupted VLAN ID may be created when a VLAN ID rewrite operation is configured
on the VLAN interface of a Cisco 10720. When this symptom occurs, the Canonical Format
Identifier (CFI) bit of the incoming 802.1q header is not preserved.
Conditions: These symptoms are observed with input packets that have the CFI bit of the 802.1q
header set to a value of “1” (CFI=1) and when the new VLAN ID value has a value of “0” for bit 4
(when the count is made from the least significant bit position). The new VLAN ID value (that is
produced by the VLAN ID rewrite operation) for the output packet will have an incorrect value of
“1” for bit 4.
The CFI bit of the incoming packet is not preserved when the value of the CFI bit is “1” and the
outgoing packet has a incorrect CFI bit value of “0”.
Workaround: There is no workaround.
•
CSCea42527
Cisco products running IOS contain vulnerabilities in the processing of H.323 messages, which are
typically used in packetized voice or multimedia applications. Features such as NAT and IOS
Firewall must inspect H.323 messages and may be vulnerable as well. A test suite has been
developed by the University of Oulu to target this protocol and identify vulnerabilities.
Support for the H.323 protocol was introduced in Cisco IOS Software Release 11.3T, and all later
Cisco IOS releases are affected if configured for various types of Voice/Multimedia Application
support. The vulnerabilities can be exploited repeatedly to produce a denial of service (DoS).
There are workarounds available that may mitigate the impact, but these techniques may not be
appropriate for use in all customer networks.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040113-h323.shtml.
•
CSCea42826
Cisco products running IOS contain vulnerabilities in the processing of H.323 messages, which are
typically used in packetized voice or multimedia applications. Features such as NAT and IOS
Firewall must inspect H.323 messages and may be vulnerable as well. A test suite has been
developed by the University of Oulu to target this protocol and identify vulnerabilities.
Support for the H.323 protocol was introduced in Cisco IOS Software Release 11.3T, and all later
Cisco IOS releases are affected if configured for various types of Voice/Multimedia Application
support. The vulnerabilities can be exploited repeatedly to produce a denial of service (DoS).
There are workarounds available that may mitigate the impact, but these techniques may not be
appropriate for use in all customer networks.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040113-h323.shtml.
•
CSCea44309
Cisco products running IOS contain vulnerabilities in the processing of H.323 messages, which are
typically used in packetized voice or multimedia applications. Features such as NAT and IOS
Firewall must inspect H.323 messages and may be vulnerable as well. A test suite has been
developed by the University of Oulu to target this protocol and identify vulnerabilities.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1968
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S3
Support for the H.323 protocol was introduced in Cisco IOS Software Release 11.3T, and all later
Cisco IOS releases are affected if configured for various types of Voice/Multimedia Application
support. The vulnerabilities can be exploited repeatedly to produce a denial of service (DoS).
There are workarounds available that may mitigate the impact, but these techniques may not be
appropriate for use in all customer networks.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040113-h323.shtml.
•
CSCea45073
Symptoms: Traffic and routing outage may be observed on a router for several minutes.
Conditions: This symptom is observed on a Cisco 12000 series when a line card reload event is
triggered by an uncorrected soft memory error and by a simultaneously bounding policy-based
routing (PBR) policy that is on an IP Services Engine (ISE) interface.
The uncorrected soft memory error trigger is observed to occur before the trigger that is caused by
the simultaneously bounding policy-based routing policy.
Workaround: There is no workaround.
•
CSCea45451
Symptoms: An active Performance Route Processor (PRP) may pause indefinitely and not enter the
ROM monitor (ROMmon) mode after its firmware is upgraded. When this behavior occurs, the
secondary PRP takes over as the primary PRP.
Conditions: This symptom is observed when the upgrade all EXEC command is entered on the
active PRP of a router that is running Cisco IOS Release 12.0(23)S and that has a dual PRP
configuration while both PRPs are enabled.
Workaround: Power-cycle the router to exit the indefinite pause state. To prevent the active PRP
from pausing indefinitely, avoid booting up both of the PRPs simultaneously. Boot up only the first
PRP to the enabled state and upgrade the PRP. Perform the same procedure with the second PRP.
•
CSCea52787
Symptoms: A memory leak may be observed on a line card with the Multicast Distributed Switching
(MDS) line card process when the ip multicast-routing global configuration command is enabled
while there are tunnel interfaces configured.
Conditions: This symptom occurs when the affected line card runs out of memory because of a
memory leak and the MDFS process on the line card attempts to allocate memory. This symptom
occurs only when multicast routing is enabled by entering the ip multicast-routing distributed
global configuration command and when a traffic engineering (TE) tunnel is configured.
Workaround: There is no workaround.
•
CSCea53471
Symptoms: A Cisco 12000 series that is configured with a Performance Route Processor 1 (PRP-1)
may pause indefinitely.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with a PRP-1 when
the configuration is being saved after it has previously received a break signal on the console. This
symptom does not affect the Gigabit Route Processor (GRP).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1969
Resolved Caveats—Cisco IOS Release 12.0(23)S3
The break signal can be received by the router when it is sent intentionally by a terminal or when it
is unintentionally received as noise on the console connection. Unintentional noise may occur if a
terminal or terminal server that is connected to the router is powered off or when certain terminals
or personal computer terminal emulators are first connected. When the router pauses indefinitely, it
must be power-cycled to be restored to a normal working condition.
Workaround: There is no workaround.
•
CSCea54482
Symptoms: A switch fabric card (SFC) switchover may occur, cyclic redundancy check (CRC)
Fabric Interface ASIC (FIA) errors may occur, and the following error message may be displayed
on a Cisco 12400 series:
FABRIC-3-ERR_HANDLE Due to CRC error from slot 8, shutdown the fabric card on slot 22
Note that the slot numbers (that is, 8 and 22) are just examples.
Conditions: These symptoms are observed after a Cisco 12400 series router that is configured with
one or more Engine 4 plus line cards is reloaded with a new Cisco IOS release that causes a
maintenance bus (MBus) download condition and while traffic is being processed on the router.
Workaround: After the router is reloaded with the new Cisco IOS release, reload the router for a
second time.
•
CSCea61480
Symptoms: An Engine 4 10-port Gigabit Ethernet (GE) line card may reload or you may not be able
to ping across the modular GE interfaces of the line card.
Conditions: This symptom is observed on a Cisco 12410 that has a redundant Clock Scheduler Card
(CSC) after you have performed an online insertion and removal (OIR) of the master (CSC).
Workaround: There is no workaround.
•
CSCea62360
Symptoms: A Cisco 12000 series Engine 3 (E3) line card may log
“EE48-2-GULF_TX_SRAM_ERROR” error messages if certain packet types are forwarded
incorrectly.
Conditions: This symptom is observed on Multiprotocol Label Switching (MPLS) Virtual Private
Network (VPN) provider edge (PE) routers when multicast traffic is destined for the customer edge
(CE) router.
Workaround: There is no workaround.
•
CSCea62725
Symptoms: The Automatic Protection Switching (APS) function may not failover after a line card
is reset.
Conditions: This symptom is observed when a line card is reset (either by entering the hw-module
reset EXEC command or by manually resetting the line card).
Workaround: There is no workaround.
•
CSCea67032
Symptoms: Some interfaces of a Cisco 10000 series 6-port channelized T3 line card may not come
up.
Conditions: This symptom is observed when you configure the T3 controller with any combination
of time slots, but using more than 15 and fewer than 21 time slots.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1970
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S3
•
CSCea68251
Symptoms: A Cisco 10720 may reboot when you enter the no srp reject H.H.H interface
configuration command on a Spatial Reuse Protocol (SRP) interface.
Conditions: This symptom is observed intermittently. If there is no valid entry to be removed for the
srp reject H.H.H interface configuration command, the command negation has no impact.
Workaround: There is no workaround.
•
CSCea68657
Symptoms: A router may not boot to the configured Cisco IOS software version when the full path
of the Cisco IOS image is specified in the boot system flash global configuration command, such
as in the following example:
boot system flash disk0:c12kprp-p-mz
Conditions: This symptom is observed on a Cisco 12000 series router that is configured with dual
Performance Route Processors (PRPs).
Workaround: Configure the boot system flash global configuration command without specifying
the device name, such as in the following example:
boot system flash c12kprp-p-mz
•
CSCea77271
Symptoms: Packets may be dropped by a 3-port line card for a Cisco 12000 series Internet router.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is configured with
a 3-port line card and that is running Cisco IOS Release 12.0(21)ST or Release 12.0(22)S when the
following conditions are met:
– Some subinterfaces are configured for Ethernet over Multiprotocol Label Switching (EoMPLS).
– Some subinterfaces are configured for IP.
– Any interface on the router is configured with an output access control list (ACL).
– A packet is received on an IP subinterface and its 802.1p VLAN priority bits are different than
the IP precedence bits and it is supposed to switch to the interface where the output ACL is
applied.
Workaround: Remove the output ACL if possible or use Cisco IOS Release 12.0(23)S or a later
release.
•
CSCea80322
Symptoms: All ports of an Engine 0 (E0) digital service 3 (DS3) card may remain in an “up/down”
condition indefinitely.
Conditions: This symptom is observed on Engine 0 (E0) DS3 cards when one of the ports receives
a “yellow” alarm.
Workaround: Enter the microcode reload global configuration command to microcode reload the
DS3 card.
•
CSCea86678
Symptoms: Auto negotiation may not work as expected on a router.
Conditions: This symptom is observed when a Cisco 10720 router is used in a network that has a
Cisco Catalyst 6500 switch and a vendor-specific optical repeater.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1971
Resolved Caveats—Cisco IOS Release 12.0(23)S3
•
CSCea87709
Symptoms: A standby Performance Routing Engine (PRE) may reload continuously, and the router
may enter the “standby cold-bulk” redundancy state.
Conditions: This symptom is observed with certain configurations. The standby PRE may reload
continuously when a new image is loaded after the hw-module reset standby-cpu reset global
configuration command is entered or after a switchover occurs.
Workaround: There is no workaround.
•
CSCea89519
Symptoms: A standby Gigabit Route Processor (GRP) may reload with a bus error.
Conditions: This symptom is observed after the ATM interface of a Cisco 12000 series is shut down.
Workaround: There is no workaround.
•
CSCea91024
Symptoms: Line cards that are installed on a Cisco 12000 series may reload.
Conditions: This symptom is observed when a Virtual Private Network (VPN) routing/forwarding
(VRF) instance is added or deleted, and a loopback interface is configured with one of the VRF
instances.
Workaround: There is no workaround.
•
CSCea91692
Symptoms: On a Cisco 12000 series router that is configured with an Engine-2-based line card that
carries both Multiprotocol Label Switching (MPLS) and IP traffic and that is forwarding packets to
an output port (that has a committed access rate [CAR] rule configured on an Engine-0, Engine-1 or
Engine-2-based output line card), the IP traffic may be dropped because of an incorrect packet
switching application-specific integrated circuit (PSA) Cisco Express Forwarding (CEF) entry.
Conditions: This symptom is observed on a Cisco 12000 series that has been upgraded from
Cisco IOS Release 12.0(21)S5 to Release 12.0(22)S or Release 12.0(23)S. This configuration
requires that the traffic enter the router on an Engine 2 line card and leave the router on an Engine-0,
Engine-1, or Engine 2-based line card that has an output CAR applied to its port.
Workaround: Remove the output CAR rule from the egress line card to restore traffic.
•
CSCeb00391
Symptoms: The following error message may be displayed on a router:
%ALIGN-3-SPURIOUS: Spurious memory access made at 0x50164CDC reading 0x0
Conditions: This symptom is observed on a Cisco 12000 series.
Workaround: There is no workaround.
•
CSCeb01992
Symptoms: Occasional ping failures may be observed over a VLAN interface.
Conditions: This symptom is observed on the VLAN interface of a Cisco 12000 series modular
Gigabit Ethernet line card. The Cisco 12000 series modular Gigabit Ethernet line card is connected
to Cisco Catalyst switches over VLAN interfaces.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1972
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S3
•
CSCeb05519
Symptoms: The core router Multiprotocol Label Switching (MPLS) forwarding entry has the correct
outgoing interface but has an incorrect label to use for sending traffic to the edge router. The
incorrect label is identical to the label that is sent by another core router for the same prefix through
another interface.
Conditions: This symptom is observed in a service provider network when the route to the prefix
that has the incorrect MPLS forwarding entry is configured using a static recursive route and the
specific IP address that is specified in the ip route prefix mask ip-address global configuration
command is changed by topology changes to go through a different adjacent router. The incorrect
outgoing Label Distribution Protocol (LDP) or Tag Distribution Protocol (TDP) label corresponds
to the router that was adjacent prior to the routing change.
Workaround: To clear this condition, enter the clear ip route {network [mask] | *} EXEC command
to cause MPLS to create a new forwarding entry that has the correct interface and label for the prefix.
To prevent this condition from occurring, advertise the route to the prefix in question using an
Interior Gateway Protocol (IGP).
Alternate Workaround: Configure a static nonrecursive route to the prefix and IP address of the
next-hop router by entering the ip route prefix mask ip-address interface-type interface-number
global configuration command.
•
CSCeb14687
Symptoms: Border Gateway Protocol (BGP) may send incomplete updates to the peer routers, and
some routers may not send full routes to their peer routers. This behavior may cause some routes to
be missing from the peer.
Conditions: This symptom is observed when a slow BGP peer in a peer group comes up while BGP
is in the process of sending updates to the peer routers. This symptom is not platform specific.
Workaround: Enter the clear ip bgp peer-address soft out EXEC command to clear this condition.
Avoid using a peer group if possible.
•
CSCeb14998
Symptoms: An Engine 2 line card that is configured with virtual routing and forwarding may reload.
Conditions: This symptom is observed under either one of the following conditions:
– When the shutdown interface configuration command followed by the no shutdown interface
configuration command is entered on a loopback interface.
– When tag switching is removed globally and then reenabled.
The line card does not come back up after it reloads and must be manually reloaded.
Workaround: There is no workaround.
•
CSCuk39189
Symptoms: Leaks may be observed for some Virtual Private Network routing and forwarding (VRF)
routes in the global Forwarding Information Base (FIB) table when a VRF is deleted and recreated.
Conditions: This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0 S
or Release 12.2 T.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1973
Resolved Caveats—Cisco IOS Release 12.0(23)S2
•
CSCuk41552
Symptoms: When you enter the show cef idb EXEC command on a primary Route Processor (RP),
the output of the command displays that for two subinterfaces of the same interface that should have
the same interface number, one of the subinterfaces has a “-” sign in the “IIndex” column and both
subinterfaces have the same number in the “FIndex” column.
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(24)S and may also occur on a Cisco 7500 series and a Cisco 10000 series. The
symptom occurs when there are multiple subinterfaces on one hardware interface, when a Stateful
Switchover (SSO) occurs, and when the original active RP (that becomes the new standby RP)
reloads.
Workaround: There is no workaround.
TCP/IP Host-Mode Services
•
CSCdz28034
Symptoms: A router may reload while you change the maximum transmission unit (MTU) size to
64 bytes on an OC-12 or OC-24 Packet-over-SONET (POS) interface.
Conditions: This symptom is observed on a Cisco 10000 series router or a Cisco 12000 series router
when Multiprotocol Label Switching (MPLS) is enabled on the interface.
Workaround: There is no workaround.
•
CSCea60379
Symptoms: A Cisco router may leak memory at a rate of up to 100 KB per day, resulting in the
gradual reduction of the available memory.
Conditions: This symptom is observed on a Cisco router that is running Label Distribution Protocol
(LDP). The symptom may be caused by applications that use TCP as the transport protocol.
Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Cisco IOS Release 12.0(23)S2 is a rebuild of Cisco IOS Release 12.0(23)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(23)S2 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
•
CSCdv51360
Symptoms: A data-link switching (DLSw) peer may be stuck in the “AB_PEND” state and a TCP
session may be stuck in the “SYNSENT” state after an IP outage occurs between two DLSw routers.
Conditions: This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(3)T
but may also occur in other releases such as Release 12.0 S or Release 12.2 S.
Workaround: Use the show tcp brief EXEC command to determine the Transmission Control Block
(TCB) of the hung TCP session. Enter the clear tcp tcb address privileged EXEC command to clear
the TCB of the hung TCP session. The DLSw peers will reconnect as long as there is IP connectivity
between the DLSw peers.
•
CSCdw01726
Symptoms: A Simple Network Management Protocol version 3 (SNMPv3) user configuration is
changed when a router is reloaded.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1974
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Conditions: This symptom is observed when an SNMPv3 user is created using message digest 5
(MD5) authentication by entering the following commands:
Router# snmp group groupy v3 auth
Router# snmp user abcdefghij groupy v3 auth md5 abcdefghij
The engine ID is then changed by entering the following command:
snmp-server engineID local 00000009020000024B0008FE
An SNMP walk is performed by entering the following command, the configuration is saved, and
the router is reloaded:
Router# snmpwalk -v 3 -u abcdefghij -A abcdefghij -a MD5 -l AuthNoPriv device-name
The SNMP walk is successful and the following debug header output is displayed when the debug
snmp EXEC command is entered:
Incoming SNMP packet: v3 packet security model: v3 security level: auth username:
abcdefghij
The router is reloaded and a second SNMP walk is performed by entering the following command:
Router# snmpwalk -v 3 -u abcdefghij -A abcdefghij -a MD5 -l AuthNoPriv device-name
After the second SNMP walk is performed, the command does not generate any output and the
following debug header output is displayed when the debug snmp EXEC command is entered:
Incoming SNMP packet: v3 packet security model: v3 security level: noauth: username:
abcdefghij
Workaround: Do not change the default engine identity (ID).
•
CSCdx00274
Symptoms: A single-port Fast Ethernet 100BASE-TX port adapter (PA-FE-TX) may stop receiving
burst traffic packets.
Conditions: This symptom is observed on a PA-FE-TX that is installed in a Cisco 7206VXR router.
Workaround: Clear the symptom by entering the shutdown interface configuration command
followed by the no shutdown interface configuration command on the affected interface of the
PA-FE-TX.
•
CSCdy23771
Symptoms: An incomplete adjacency is created between a provider edge (PE) router and a customer
edge (CE) router. This situation causes a ping from one CE router to another CE router to fail.
Conditions: This symptom is observed in a Multiprotocol Label Switching (MPLS) Virtual Private
Network (VPN) environment.
Workaround: First send a ping from the PE router to the CE router. After that, you can send a ping
from one CE router to the other CE router.
•
CSCdy36238
Symptoms: Group G (*,G) multicast route (mroute) state joins may no longer be sent. This situation
may cause traffic to stop flowing after the group G mroute state times out.
Conditions: This symptom is observed after Protocol Independent Multicast (PIM) is disabled and
then reenabled on an interface that serves as the only PIM interface on a router.
Workaround: There is no workaround.
•
CSCdy37606
Symptoms: A Cisco 12000 series may generate the following message:
%LINK-3-TOOSMALL: Interface POS3/0, Output runt packet of 0 bytes
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1975
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(21)S5, when an error occurs on an Engine 2 line card and when both sampled NetFlow
and Multiprotocol Label Switching (MPLS) are enabled.
Workaround: Disable sampled NetFlow. Note that this workaround affects service because disabling
sampled NetFlow causes Cisco Express Forwarding (CEF) to reload on the line card.
•
CSCdy40742
Symptoms: After a Border Gateway Protocol (BGP) neighbor resets, CPU utilization may run very
high on a Cisco 12000 series.
Conditions: This symptom is observed when the default-metric BGP command is enabled in the
BGP router configuration.
Workaround: There is no workaround.
•
CSCdy41660
Symptoms: For a short period of time, a forwarding engine can continue to send traffic to an
interface that has just been shut down. Depending on traffic rates, this may consume all of the output
buffer on the line card, causing the other interfaces on that line card to go down.
Conditions: This symptom is observed under rare circumstances.
Workaround: There is no workaround.
•
CSCdy49411
Symptoms: Traffic policing may not function.
Conditions: This symptom is observed on the Network Processing Engine (NPE) of a Cisco 7200
series router.
Workaround: There is no workaround.
•
CSCdy51437
Symptoms: A Versatile Interface Processor (VIP) may reload because of a direct memory access
(DMA) receive error and may display a message that is similar to the following:
CYASIC Error Interrupt register 0x2000000
DMA Receive Error
CYASIC Other Interrupt register 0x180
QE HIGH Priority Interrupt
Unknown CYA oisr bit 0x00000080
QE RX HIGH Priority Interrupt
QE TX HIGH Priority Interrupt
CYBUS Error Cmd/Addr 0x8000068, CYBUS Error Data 0x0
MPUIntfc/PacketBus Error register 0x0
Conditions: This symptom is observed while there is a large amount of Internet MIX (IMIX) traffic
on a 2-port Fast Ethernet port adapter (PA-2FE) that is installed on the VIP of a Cisco 7500 series.
Workaround: There is no workaround.
•
CSCdy54493
Symptoms: A “%SNMP-3-CPUHOG: Processing GetNext of ciscoFlashDeviceEntry.5.8” error
message is displayed during a Simple Network Management Protocol (SNMP) query on
ciscoFlashDeviceEntry.
Conditions: These symptoms can occur on any Cisco router that is running Cisco IOS software.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1976
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Temporary Workaround: Exclude ciscoFlashMIB by entering the snmp-server global configuration
command. If SNMP must be enabled on the Flash devices, then there is no workaround.
•
CSCdy60008
Symptoms: If you change the interface bandwidth or delay, a router may reload.
Conditions: This symptom is observed after Enhanced Interior Gateway Routing Protocol (EIGRP)
is terminated via the no router eigrp as-number global configuration command or the no ip routing
global configuration command, causing the EIGRP process list to be invalid.
Workaround: Reload the router after you have terminated EIGRP.
•
CSCdy61223
Symptoms: When an input access control list (ACL) is configured and multiple broadcast Address
Resolution Protocol (ARP) requests are received, packet loss and performance degradation may
occur because of a “format error” that is reported in the output of the show ip traffic EXEC
command.
Conditions: This symptom is observed when you have enabled NetFlow on an interface of a 1-port
Gigabit Ethernet line card that is installed in a Cisco 12000 series that is running Cisco IOS
Release 12.0(16)S or Release 12.0 (22)S.
Workaround: Although the condition is triggered by multiple broadcast ARP requests, it only occurs
if NetFlow, input ACLs, and ACL hardware checking are configured. Disabling any of these features
will prevent the condition from occurring. For example, to remove the ACL hardware checking on
the 1-port Gigabit Ethernet line card, enter the no access-list hardware salsa command.
•
CSCdy73551
Symptoms: Packets are not exported from a Cisco 12000 series 1-port Gigabit Ethernet line card.
Conditions: This symptom is observed when an input access control list (ACL) and Sampled
NetFlow (SNF) are configured using the access-list hardware salsa command.
Workaround: There is no workaround.
•
CSCdz74925
Symptoms: A 4-port OC-48 Packet-over-SONET (POS) Engine 4 plus (E4+) line card may stop
forwarding traffic after you have reloaded microcode onto the line card.
Conditions: This symptom is observed on a Cisco 12000 series that is running the gsr-p-mz image
of Cisco IOS Release 12.0(24)S in a carrier supporting carrier configuration when the 4-port OC-48
POS E4+ line card interconnects a provider edge (PE) and a provider (P) router.
Workaround: Enter the clear ip bgp privileged EXEC command on the PE router.
•
CSCdy75434
Symptoms: A line card in a provider edge (PE) router that is running IP version 6 (IPv6) in a
Multiprotocol Label Switching (MPLS) environment (also referred to as a 6PE router) or in any
connected router may reload because of a fabric ping failure, and the following error message may
be generated:
%FIB-3-FIBDISABLE: Fatal error, slot 1: IPC Failure: timeout
%GRP-3-COREDUMP: Core dump incident on slot 1, error: Fabric ping failure (seq:3279)
%GRP-4-RSTSLOT: Resetting the card in the slot: 1,Event:
EV_LC_E4_CORE_DUMP_DECLINE_DUP
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1977
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Conditions: This symptom is observed on a Cisco 12000 series that functions as a 6PE router or on
any connected router when an IPv6 default route is removed from another 6PE router and traffic is
flowing through the IPv6 default route while the route update following the route removal is being
processed. When the IPv6 default route is removed, one or more line cards may reload on any router
that receives the route update.
Workaround: There is no workaround.
•
CSCdy79494
Symptoms: An Engine 2 egress line card that is installed in a Cisco 12000 series that is functioning
as a provider edge (PE) router reloads when a customer edge (CE) router starts sending traffic, and
the following error messages are generated:
* %LCLOG-3-INVSTATE: LC logger in an invalid state (LC=3,state=WAITING FOR
TEXT,msg=MSG START) -Traceback= 503583F8 502F6464 5021C54C 5021C538 SLOT 3:
%LC-3-PSAERRS: PSA PSA_CPU_GS_INT error 4 SLOT 3:
%LC-3-PSAERR: PSA error: if_err 0 adr FC00002C cmd 5 data 0 pipe 0,fs 0,prep 0 (pc
1E5),pop 0 (pc 19C),plu 0,tlu 0,plu sdram 0 adr 0 synd 0 ch *
%GRP-3-FABRIC_UNI: Unicast send timed out (3). * %LCINFO-3-CRASH: Line card in slot
3 crashed
Conditions: This symptom is observed only when the ip cef accounting non-recursive per-prefix
global configuration command is enabled.
Workaround: There is no workaround.
•
CSCdy80592
Symptoms: A Cisco 12000 series may reload because of a redzone corruption.
Conditions: This symptom is observed on a Cisco 12000 series that is running the gsr-k4p-mz image
of Cisco IOS Release 12.0(21)S1.
Workaround: There is no workaround.
•
CSCdy87260
Symptoms: On a dual Route Processor (RP) router that has the Route Processor Redundancy Plus
(RPR+) feature enabled, the configuration synchronization may fail when two break instances are
sent on the standby RP.
Conditions: This symptom is observed on a Cisco 12000 series only if the user sends two break
instances on the standby RP.
Workaround: There is no workaround.
•
CSCdy87479
Symptoms: An OC-12 Dynamic Packet Transport (DPT) line card may reload when IP version 6
(IPv6) is configured on the interface.
Conditions: This symptom is observed when IPv6 traffic enters the interface.
Workaround: Unconfigure IPv6 on the interface, and use tunnels instead.
•
CSCdz06100
Symptoms: A permanent virtual circuit (PVC) on a standby Route Processor (RP) may go down after
the oam-pvc manage interface-ATM-VC configuration command is enabled. This behavior may
cause the RP to take a longer time to be brought up after an RP switchover occurs. Traffic on a
Cisco 12000 series or Cisco 10000 series Edge Services Router (ESR) may be interrupted for about
10 seconds when this behavior occurs.
Conditions: This symptom is observed on the standby RP of a Cisco 10000 series that is running
Cisco IOS Release 12.0(23)S.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1978
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Workaround: Enter the no oam-pvc manage interface-ATM-VC configuration command to disable
generation of Operation, Administration, and Maintenance (OAM) loopback cells and OAM
management on the ATM PVC.
•
CSCdz07032
Symptoms: When you add a new Performance Routing Engine (PRE) to a Cisco 10000 series, the
startup configuration may not be copied to the new PRE. Verify that the configuration exists by
entering the dir sec- nvram: EXEC command or the dir standby-nvram: EXEC command,
depending on the Cisco IOS software image that you are running.
Conditions: The conditions under which this symptom occurs are not known at this time.
Workaround: Cut over to the new PRE, and save the configuration.
•
CSCdz10165
Symptoms: A Tag Forwarding Information Base (TFIB) entry for a Virtual Private Network (VPN)
routing/forwarding (VRF) static recursive route that is configured for multihop Border Gateway
Protocol (BGP) may be lost.
Conditions: This symptom is observed after the egress interface flaps.
Workaround: There is no workaround.
•
CSCdz12745
Symptoms: When a Cisco 12000 series Engine 2 Packet-over-SONET (POS) line card collects
statistics for locally assigned Multiple Protocol Label Switching (MPLS) label entries, it may lose
the outgoing label entries for the associated prefixes. All the prefixes show up as untagged, and it
may be difficult or impossible to reach the prefixes.
Conditions: This symptom is observed on a Cisco 12000 series Engine 2 POS line card.
Workaround: To recover from the situation, reset the line card.
•
CSCdz16897
Symptoms: The Path Remote Defect Indication (PRDI) may not be handled properly during an
Automatic Protection Switching (APS) switchover. This situation does not affect service.
Conditions: This symptom is observed on a Cisco 10000 series OC-12 ATM line card when an APS
switchover occurs because of poor line quality.
Workaround: There is no workaround.
•
CSCdz17230
Symptoms: Loadsharing may occur unevenly.
Conditions: This symptom is observed on a Cisco 12000 series line card that does not support 16
hash buckets for loadsharing when Cisco Express Forwarding still attempts to use 16 hash buckets
instead of the maximum number of hash buckets that is supported by the hardware.
Workaround: There is no workaround.
•
CSCdz18497
Symptoms: A router may loop indefinitely when a Simple Network Management Protocol (SNMP)
walk is performed against certain objects. The SNMP walk will not cycle if a specific interface is
specified.
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(21)S6.
Workaround: Reload the router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1979
Resolved Caveats—Cisco IOS Release 12.0(23)S2
•
CSCdz18851
Symptoms: A spurious memory error may occur when the microcode of an Engine 3 (E3) 16-port
OC-3 (16xOC-3) Packet over SONET (POS) line card is reloaded.
Conditions: This symptom is observed on the E3 16xOC-3 POS line card of a Cisco 12000 series.
Workaround: There is no workaround.
•
CSCdz19320
Symptoms: A Cisco 12000 series Engine 4 plus line card may reload after a forced switchover.
Conditions: This symptom is observed when Stateful Switchover (SSO) and Intermediate
System-to-Intermediate System (IS-IS) are configured.
Workaround: Disable IS-IS.
•
CSCdz21375
Symptoms: A memory leak may occur on a line card.
Conditions: This symptom is observed on the line card of a Cisco 12000 series after NetFlow is
disabled on the last interface of a line card that has NetFlow enabled. This symptom is observed
while there are more than 1900 flow records in the NetFlow cache of the line card.
Workaround: Keep NetFlow enabled on at least one interface on the line card.
•
CSCdz25228
Symptoms: An Engine 2 (E2) line card may reload after it reboots.
Conditions: This symptom is observed on the E2 line card of a Cisco 12000 series that is running
the gsr-p-mz image of Cisco IOS Release 12.0(23)S. The E2 line card is configured with 128 line
input access control list (ACLs), Virtual Private Network (VPN), and has Frame Relay configured
on one of the interfaces.
Workaround: There is no workaround.
•
CSCdz25339
Symptoms: An unusually formatted Multicast Source Discovery Protocol (MSDP) packet may cause
memory corruption and a router to reload.
Conditions: This symptom is observed on a Cisco router when it has a peer relationship with a
specific third-party vendor router that is running a recent software release.
Workaround: Shut down the peer relationship by entering the ip msdp shutdown peer-address
global configuration command.
•
CSCdz28113
Symptoms: Manual Layer 2 Tunneling Protocol (L2TP) version 3 tunnels fail when two or more
tunnels are configured to different destination provider edge (PE) routers. All of the traffic that
enters the tunnel is forwarded to the same PE regardless of the configured PE address. This symptom
is also observed when the user starts off with one manual tunnel configuration that points to a
particular PE router and later changes the configuration to point to a different PE router.
Assuming that PE router 1 (PE1) is the initial router that the manual configuration points to and PE
router 2 (PE2) is the subsequent PE router that the configuration is subsequently configured to point
to, traffic will be sent to PE1 even after the configuration has been altered to point to PE2.
Conditions: This symptom is observed when the user has more than one manual L2TP version 3
tunnel configured and when at least one of those tunnels is going to a different destination IP address
than the other tunnels.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1980
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Workaround: Use negotiated L2TP sessions or enable keepalive processing on the manual L2TP
version 3 tunnels.
•
CSCdz29044
Symptoms: An Engine 3 line card that connects a provider edge (PE) router and a customer edge
router, both of which are running the Carrier Supporting Carrier feature, may reload.
Conditions: This symptom is observed on a Cisco 12000 series that is running the gsr-p-mz image
of Cisco IOS Release 12.0(23)S, that is functioning as a PE router, and that is running the Carrier
Supporting Carrier feature when you reload microcode on one of multiple line cards that connects
the PE router to a provider (P) router.
Note that the symptom occurs on an Engine 3 line card that connects the PE router and the CE router,
but the microcode is reloaded onto another line card that connects the PE router and the P router.
Workaround: There is no workaround.
•
CSCdz31376
Symptom: A Versatile Interface Processor (VIP) may reload unexpectedly if the following sequence
is performed:
1) Enable distributed Cisco Express Forwarding (dCEF) by entering the ip cef distributed
global configuration command.
2) Disable the NetFlow Flow-cache or NetFlow switching for IP routing (using the no ip
route-cache flow global configuration command).
3) Configure Cisco Express Forwarding (CEF) using the ip cef global configuration command.
4) Re-enable dCEF by entering the ip cef distributed global configuration command.
5) Re-enable ip flow-cache commands, or enter the ip route-cache flow command.
6) Configure CEF using the ip cef global configuration command.
Conditions: This symptom was observed durning Cisco internal testing using VIP software, version
12.0(22.4)S.
Workaround: Re-enable ip flow-cache or ip route-cache flow commands before re-enabling dCEF,
or upgrade to Release 12.0(23)S2 (recommended). This issue is resolved in 12.0(24)S.
•
CSCdz31864
Symptoms: The OC-48 Packet-over-SONET (POS) bandwidth on a Performance Routing Engine 1
(PRE1) may not exceed 1.2 Gbps. The bandwidth should be able to scale to 1.4 Gbps.
Conditions: This symptom is observed on a Cisco 10000 series.
Workaround: There is no workaround.
•
CSCdz32724
A line card that is facing the core of a Multiprotocol Label Switching (MPLS) Virtual Private
Network (VPN) may generate packet switch application-specific integrated circuit (ASIC) (PSA)
error messages and may stop sending traffic to the core of the network. The following output may
be observed when the show interface gigabit ethernet interface EXEC command is entered.
%LC-3-PSAERRS: PSA PSA_CPU_GS_INT error 4
%LC-3-PSAERR: PSA error: if_err 0 adr FC00002C c md 5 data 0 pipe 0,fs 0,prep 0 (pc
1EC),pop 0 (pc 19F),plu 0,tlu 0,plu sdram 0 a dr 0 synd 0 check 4D00,tlu sdram 0 adr
0 synd 0 check 0,ssdram 0 adr 0,gather 0, pl 1822D92,plmuxcnts 61, pludefpsr 22000,
plupsr 22000, pludsr 0
Conditions: These symptoms are observed on a Cisco 12000 series 3-port Gigabit Ethernet line card
when the line card flaps.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1981
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Workaround: There is no workaround.
•
CSCdz32988
Symptoms: The CPU on a Cisco 7500 series Versatile Interface Processor (VIP) or on a Cisco 12000
series line card may persistently show very high utilization (99 percent) reported against the “TAG
Stats Background” process, as is displayed in the output of the show processes cpu EXEC
command:
CPU utilization for five seconds: 100%/1%; one minute: 99%; five minutes: 99%
PID
53
Runtime(ms)
31226460
Invoked
uSecs
5Sec
1Min
5Min
603427
51748
98.39% 98.60% 97.08%
TTY Process
0 TAG Stats Backgr
This situation does not directly impact the router operation because the “TAG Stats Background”
process is a low priority process. However, the show mpls forwarding-table EXEC command does
not provide accurate counters when this situation occurs.
Conditions: This symptom, which is a rare race condition, may occur when parallel paths are
configured.
Workaround: Enter the no tag ip aggregate hidden command on the route processor. Note that doing
so will prevent the counters of the show mpls forwarding-table EXEC command from being
updated.
To restore normal VIP or line card operation, reload microcode onto the affected VIP or line card.
•
CSCdz33176
Symptoms: A Cisco router that is functioning as a dedicated Border Gateway Protocol (BGP) Route
Reflector (RR) in a network that is configured for BGP may display a message very similar to the
following one on its console:
%SYS-3-CPUHOG: Task ran for 30020 msec (6/6), process = BGP Router, PC = 6080D21C.
When the message is displayed, the BGP router process causes the CPU utilization of the router to
become high for one to several minutes, depending on the number of prefixes, neighbors, and
updates.
Conditions: This symptom is observed when the router is running Cisco IOS Release 12.0(22)S or
a later release, when it has a large number of neighbors that are configured in peer groups or update
groups, when it has a large number of prefixes to send or receive, and when most of the neighbors
start at the same time, or when the BGP sessions of the neighbors are reset at the same time using
the clear ip bgp * EXEC command.
The symptom is also observed in the above-mentioned network topology when the client of a BGP
RR is reset using the clear ip bgp * EXEC command.
Workaround: Do not reset all the BGP neighbor routers at the same time when RRs are used in a
BGP configuration.
Alternate Workaround: Use Cisco IOS Release 12.0 ST.
•
CSCdz33882
Symptoms: A Route Processor (RP) may reload.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with dual RPs in
Stateful Switchover (SSO) mode and that has about 200 Intermediate System-to-Intermediate
System (IS-IS) neighbors when Nonstop Forwarding (NSF) is configured under the IS-IS process.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1982
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S2
•
CSCdz34552
Symptoms: A Cisco 10720 router that is functioning as a provider (P) router may stop correctly
performing Multiprotocol Label Switching (MPLS) label disposition, which can be verified in the
output of the show hardware pxf cpu mpls label privileged EXEC command.
Conditions: This symptom is observed in a fully meshed network of provider edge (PE) routers that
are connected via 802.1q links and occurs when a link breaks.
Workaround: There is no workaround. To clear the situation, enable explicit null labels or enter the
clear ip bgp privileged EXEC command.
•
CSCdz35853
Symptoms: When a SONET link is not stable, the following error messages may be generated on a
1-port OC-48 Port Packet-over-SONET (POS)/Synchronous Digital Hierarchy (SDH) IP Services
Engine (ISE) line card:
SLOT 1: %EE48-3-GULF_RX_MOFIFO: Overflow detected. Corrective action taken.
SLOT 1: %EE48-3-GULF_RX_BYTE_TO_WORD: Out of synchronization, bitmap= 0xE. Corrective
action taken.
Conditions: This symptom is observed under rare circumstances on a Cisco 12000 series that is
running Cisco IOS Release 12.0(22)S2.
Workaround: Reload the line card.
•
CSCdz35977
Symptoms: IP multicast routes (mroutes) may not be downloaded to some line cards when a router
is reloaded. The show ip mroute EXEC command can be entered on the Route Processor (RP) and
the show ip mds forwarding EXEC command on the line cards to verify if mroutes are missing
from the line cards.
Conditions: This symptom is observed when hardware-assisted multicast forwarding is used on a
line card and occurs only if two line cards are reloaded simultaneously.
Workaround: Enter the clear ip mroute EXEC command on the line card to clear this symptom.
•
CSCdz36445
Symptoms: Traffic does not resume after a Cisco 12000 series has reloaded.
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(24)S in an IP version 6 (IPv6) environment and that is configured with Engine 3 line
cards.
Workaround: There is no workaround.
•
CSCdz39645
Symptoms: Engine 4 (E4), Engine 4 Plus (E4+), Gigabit Ethernet, and Packet-over-SONET (POS)
line cards on the transmit (TX) side may drop multicast packets. The multicast packets are meant to
be fragmented by the Tx slow path.
Conditions: This symptom is observed on any incoming receive (RX) line card if the maximum
transmission unit (MTU) of any outgoing interfaces is less than the size of the incoming packet. This
symptom will not occur in the TX fast path or with non-fragmented packets.
Workaround: There is no workaround.
•
CSCdz42268
Symptoms: Virtual Router Redundancy Protocol (VRRP), Hot Standby Routing Protocol (HSRP),
and other applications may not work as expected.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1983
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Conditions: This symptom is observed on an Ethernet line card after either an online insertion and
removal (OIR) or a microcode reload procedure is performed.
Workaround: There is no workaround.
•
CSCdz42976
Symptoms: Open Shortest Path First (OSPF) or Intermediate System-to-Intermediate
System (IS-IS) protocol adjacencies may be incomplete.
Conditions: This symptom is observed on a Cisco router after it is loaded with Cisco IOS
Release 12.0(21)ST5 but may also occur in Cisco IOS Release 12.0 S. This symptom may affect
connectivity across Engine 2 (E2) interfaces.
Workaround: There is no workaround.
•
CSCdz45031
Symptoms: The distance eigrp router configuration command may not be displayed in the
configuration although the configured values are applied to the routes. After you reload the router,
the distance for Enhanced Interior Gateway Routing Protocol (EIGRP) routes returns to its default
value.
Conditions: This symptom is observed on a Cisco router when you use EIGRP between a provider
edge (PE) and customer edge (CE) router in a Multiprotocol Label Switching (MPLS) environment.
Workaround: There is no workaround.
•
CSCdz45055
Symptoms: OPM (Optical Power Monitoring) may provide incorrect or nonrealistic values and may
report that modules are down while they are functioning fine.
Conditions: This symptom is observed when you use small form-factor pluggable (SFP) optical
modules that are externally calibrated.
Workaround: There is no workaround.
•
CSCdz45760
Symptoms: A useless partial Shortest Path First (SPF) calculation may occur.
Conditions: This symptom is observed when an Open Shortest Path First (OSPF) link-state
advertisement (LSA) for a 0.0.0.0 destination is refreshed.
Workaround: Use a static default route.
•
CSCdz46604
Symptoms: Multilink adjacencies may show up as invalid.
Conditions: This symptom is observed on the Engine 3 (E3) Quad OC-12 line card of a Cisco 12000
series that is running Cisco IOS Release 12.0(21)S3. It may not be possible to clear this symptom
by entering the clear cef line EXEC command or by reloading the microcode on the line card.
Workaround: There is no workaround.
•
CSCdz47189
Symptoms: An Engine 3 (E3) 4-port OC-12 (4xOC-12) or E3 OC-48 Packet over SONET (POS) line
card may reload and generate traceback messages.
Conditions: This symptom is observed when the gsr-p-mz image of Cisco IOS Release 12.0(24)S is
loaded on a Cisco 12406 router in an Inter Autonomous System Multiprotocol Label Switching
(MPLS) Virtual Private Network (VPN) of an IP version 4 (IPv4) Border Gateway Protocol (BGP)
label distribution environment. The E3 4xOC-12 line card may be operating either in the
channelized mode or the POS mode.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1984
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Workaround: No workaround is necessary as the line cards will recover without user intervention.
•
CSCdz48235
Symptoms: A Cisco 12000 series may reload because of a bus error.
Conditions: This symptom is observed on a Cisco 12000 series that has dual Gigabit Route
Processors (GRPs) and that is operating in the Route Processor Redundancy (RPR) mode. This
symptom is observed after the Cisco 12000 series is upgraded to Cisco IOS Release 12.0(23)S.
Workaround: There is no workaround.
•
CSCdz52218
Symptoms: The VLAN ID may be rewritten to zero on an egress provider edge (PE) router.
Conditions: This symptom is observed in the Ethernet over Multiprotocol Label Switching
(EoMPLS) Port Transport mode when the underlying packets are 802.1q packets with a nonzero
class of service (CoS) value.
Workaround: There is no workaround.
•
CSCdz52438
Symptoms: The forwarding state change of a multicast route on a line card may affect the fast path
forwarding state of another multicast route. This behavior may cause the latter stream to be punted
to the CPU of the line card and lead to a high CPU utilization condition.
Conditions: This symptom is observed on the 2-port OC-48 (2xOC-48) Spatial Reuse Protocol
(SRP) line card of a Cisco 12400 series.
Workaround: Enter the clear ip mroute * EXEC command on the router to refresh the forwarding
states of all multicast routes.
•
CSCdz53743
Symptoms: A Cisco 12000 image may time out and fail to load via TFTP.
Conditions: This symptom is observed when a Cisco 12000 boot loader image is used to load the
main Cisco IOS software image via TFTP. This symptom occurs because the boot loader image uses
“00:00:00:00:00:00” as the MAC address for Ethernet 0. This symptom is observed in Cisco IOS
Releases 12.0(20)S, 12.0(20)ST, and later releases.
Workaround: There is no workaround.
•
CSCdz53850
Symptoms: A standby Route Processor (RP) may reload.
Conditions: This symptom is observed on the standby RP of a dual RP Cisco 12000 series when a
line card on the Cisco 12000 series or a neighboring router is reloaded. This symptom occurs when
a line card has a large number of encapsulation entries (3000 entries).
Workaround: There is no workaround.
•
CSCdz54539
Symptoms: An Engine 4 plus line card that is installed in a Cisco 12400 series may be reset by the
Route Processor (RP) because of interprocess communication (IPC) failures. The following errors
may be displayed:
%CPUIF-3-NO_MEM: sendreq_freeq is NULL.
%MDS-2-LC_FAILED_IPC_ACK: RP failed in getting Ack for IPC message of size 148 to LC
in slot 3 with sequence 58638, error = timeout
%FIB-3-FIBDISABLE: Fatal error, slot 3: IPC Failure: timeout
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1985
Resolved Caveats—Cisco IOS Release 12.0(23)S2
%GRP-4-RSTSLOT: Resetting the card in the slot: 3,Event:
EV_AUTO_LC_RELOAD_ON_FIBDISABLE ]
Conditions: These symptoms are observed when route flapping occurs; route flapping may generate
a high volume of IPC traffic.
Workaround: There is no workaround.
•
CSCdz55717
Symptoms: Configuring OSPF (Open Shortest Path First) sham links in a Multiprotocol Label
Switching (MPLS) Virtual Private Network (VPN) environment may cause a memory leak in the
OSPF router process.
Conditions: This symptom is observed in a MPLS-VPN environment. The area area-id sham-link
source-address destination-address cost number global configuration command is used and OSPF
adjacency is formed over the sham-link. Each time an OSPF acknowledgment is sent over the
sham-link, some memory is allocated that is never freed.
Workaround: There is no workaround.
•
CSCdz55944
Symptoms: Switch fabric cards (SFCs) may fail on a Cisco 12410 router.
Conditions: This symptom is observed when there is an upgrade to a Cisco IOS release.
Workaround: There is no workaround.
•
CSCdz55995
Symptoms: Packet or byte counters may not be accurate.
Conditions: This symptom is observed when a parity error occurs on a Cisco 12000 series Engine 4
or Engine 4 plus line card.
Workaround: There is no workaround.
•
CSCdz56010
Symptoms: A router may reload while it is booting up if a different line card is installed in place of
a 4-port channelized OC-3 (4xOC-3) line card in the even slot.
Conditions: This symptom can be reproduced by performing the following steps:
a. Configure a Cisco 10000 series with two 4xOC-3 line cards in adjacent odd or even slots.
b. Save the running configuration to ensure that the card commands are saved in the running
configuration.
c. Reload the router.
d. Remove and replace the 4xOC-3 line card in the even slot with a different line card.
e. Boot the router.
Workaround: The following steps may prevent the router from reloading:
a. Remove the 4xOC-3 line card from the even slot.
b. Enter the no card 4/0 command.
c. Copy the running configuration to the startup configuration.
d. Reload the router.
•
CSCdz56792
Symptoms: A Quad OC-12 ATM line card that is configured for the Carrier Supporting Carrier
feature may reset or report an error.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1986
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(22)S3 and that is functioning as a customer carrier customer edge (CE) router, after
you enter the no mpls ip global configuration command followed by the mpls ip global
configuration command.
Workaround: There is no workaround.
•
CSCdz58674
Symptoms: When an area border router receives type-4 link-state advertisements (LSAs) via the
nonbackbone, the router may incorrectly generate type-4 LSAs into the backbone. This situation
may cause a routing loop to occur.
Conditions: This symptom is observed in Cisco IOS Release 12.0(22)S or a later release or
Release 12.2(10) or a later release.
Workaround: Reset the Open Shortest Path First (OSPF) process by entering the clear ip ospf
process privileged EXEC command.
•
CSCdz59591
Symptoms: The append modifier does not append data to named files on Advanced Technology
Attachment (ATA) devices and the original contents of the named file remains unchanged.
Conditions: This symptom affects Cisco IOS releases that have the fix for CSCdz27200.
Workaround: There is no workaround.
•
CSCdz60152
Symptoms: When you configure additional access control entry (ACE) entries with Layer 4 fields
on a 128-line input access control list (ACL) that is configured on an Engine 4 plus (E4+) line card,
the line card may reload.
Conditions: This symptom is observed on a Cisco 12000 series 1-port 10-Gigabit Ethernet E4+ line
card.
Workaround: Do not add more than 128 ACEs with Layer 4 fields. If more than 128 ACEs with
Layer 4 fields are required, remove the ACL form the E4+ line card, add the ACEs with Layer 4
fields, and then reapply the ACL to the line card.
•
CSCdz60229
Cisco devices which run Cisco IOS software and contain support for the Secure Shell (SSH) server
are vulnerable to a Denial of Service (DoS) if the SSH server is enabled on the device. A malformed
SSH packet directed at the affected device can cause a reload of the device. No authentication is
necessary for the packet to be received by the affected device. The SSH server in Cisco IOS software
is disabled by default.
Cisco will be making free software available to correct the problem as soon as possible.
The malformed packets can be generated using the SSHredder test suite from Rapid7, Inc.
Workarounds are available. The Cisco PSIRT is not aware of any malicious exploitation of this
vulnerability.
This advisory is available at http://www.cisco.com/warp/public/707/ssh-packet-suite-vuln.shtml
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1987
Resolved Caveats—Cisco IOS Release 12.0(23)S2
•
CSCdz63938
Symptoms: On a Cisco router that is configured for distributed Cisco Express Forwarding (dCEF)
and Border Gateway Protocol (BGP) and that has a large number of BGP routes, the following
messages may be displayed:
%SYS-2-MALLOCFAIL: Memory allocation of 32768 bytes failed from 0x5021F524, alignment
0
Pool: Processor Free: 23492 Cause: Not enough free memory
Alternate Pool: None Free: 0 Cause: No Alternate pool
-Process= "BGP Router", ipl= 0, pid= 153
-Traceback= 502243C8 50227438 5021F52C 5010E0A4 50124FF0 504F0F50 504C01B0 504C0868
50701408 50702614 50C5AF48 507026B0 506D1920 5021C80C 5021C7F8
%FIB-3-NORPXDRQELEMS: Exhausted XDR queuing elements while prep
In addition, CEF may be disabled and a message very similar to the following message may be
displayed:
%FIB-2-FIBDOWN: CEF has been disabled due to a low memory condition.
If new BGP neighbors are peering at the same time, the following message may also be displayed:
%SYS-3-CPUHOG: Task ran for 29984 msec (4/0), process = BGP Router, PC = 506D0DF4.
-Traceback= 506D0DFC 5021C80C 5021C7F8
When this last message is displayed, the BGP router process may cause the CPU utilization of the
router to become high for one to several minutes, depending on the number of prefixes and neighbors
that are configured and the number of updates that are occurring.
Conditions: These symptoms are observed under rare conditions on a distributed platform router,
such as the Cisco 12000 series, that is configured with line cards and that is running Cisco IOS
Release 12.0 S when you run the router beyond its physical limitations, especially when you run the
router for a long time under very low memory conditions and with, or along with, a large number of
routes, peers, and line cards. All of these conditions may lead to abnormality in the steady state
performance of the router.
If CEF is disabled because of low memory conditions, you can reenable it by entering the ip cef
distributed global configuration command.
Workaround: Limit the number of BGP routes on the router in relation to the memory that is installed
in the router. For example, on a Cisco 12000 series that is configured with 256 MB of memory and
based on different parameter of the routes, limit the maximum number of routes that BGP installs
to about 150,000 routes.
First Alternate Workaround: Increase the memory on the router and on the line cards to
accommodate the large number of routes. For example, if a Cisco 12000 series is configured with
256 MB of memory, increase the memory to 512 MB to enable better performance with a large
number of routes.
Second Alternate Workaround: Adjust the BGP parameters by applying aggregation features or
enabling the auto-summary router configuration command for BGP, or by using the
aggregate-address router configuration command to reduce the number of BGP routes. These
actions can help to reduce the memory usage of BGP and CEF.
Closing Comments: This caveat is closed because it is related to the limitation that is posed by
256 MB of memory. Future releases may include changes to BGP to enable BGP to use less transient
memory when it builds updates.
•
CSCdz65683
Symptoms: Interfaces that are configured on the 8xOC-3 Engine 2 line card or the 16xOC-3
Engine 2 line card may not be recovered from a down/down state.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1988
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S2
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(24)S.
Workaround: There is no workaround.
•
CSCdz69295
Symptoms: A router may reload when a route that is learnt via Intermediate System-to-Intermediate
System (IS-IS) IP version 6 (IPv6) has more than eight equal-cost paths.
Conditions: This symptom is observed when more than eight equal-cost links are configured
between two IS-IS IPv6 routers. Depending on the network topology, the symptom may also occur
when there are less then eight equal-cost links between an IS-IS IPv6 router and its neighbors.
Workaround: Ensure that there are less than eight equal-cost links configured between two IS-IS
IPv6 routers.
•
CSCdz69362
Symptoms: Tag forwarding counter may no longer function when parity errors occur on an
Engine 4 plus line card.
Conditions: This symptom is observed on a Cisco 12000 series.
Workaround: There is no workaround.
•
CSCdz71662
Symptoms: A Cisco router may fail because of a bus error while an online insertion and removal
(OIR) is in progress.
Conditions: This symptom is observed on a Cisco 12000 series when the show environment
command is being executed while an OIR is in progress.
Workaround: Do not perform an OIR when the show environment command is being executed.
•
CSCdz74588
Symptoms: Traffic on a load-sharing path may be switched to the wrong destination or dropped
altogether.
Conditions: This symptom is observed when a Cisco 12000 series Engine 4 (E4) line card is on the
ingress side, there is a load-sharing path or multiple paths on the egress side, and a hidden class of
service (CoS) global configuration command is configured on the router.
Workaround: Remove the extra load-sharing paths, and make it one single outgoing path.
•
CSCdz81035
Symptoms: When you write a crashinfo file to an Advanced Technology Attachment (ATA) Flash
disk, the file on the ATA Flash disk may be corrupt and unusable.
Conditions: This symptom is observed on any Cisco device that enables the crashinfo file to be
written to an ATA Flash disk.
Workaround: There is no workaround.
•
CSCdz81906
Symptoms: A T1 or E1 link that is configured under AU-4-TUG-3 controllers 4 through 12 on a
1-port channelized OC-12 line card that is using Synchronous Digital Hierarchy (SDH) framing may
not come up.
Conditions: This symptom is observed on a Cisco 10000 series when the 1-port channelized OC-12
line card is connected to a third-party vendor device. Note that the symptom does not occur when
you use AU-4-TUG-3 controllers 1 through 3.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1989
Resolved Caveats—Cisco IOS Release 12.0(23)S2
•
CSCdz83304
Symptoms: T3 links on a 4-port channelized OC-3 line card may not come up under Synchronous
Digital Hierarchy (SDH) framing.
Conditions: This symptom is observed on a Cisco 10000 series when the 4-port channelized OC-3
line card interoperates with a third-party vendor device.
Workaround: There is no workaround.
•
CSCdz88629
Symptoms: An interface of a 3-port Gigabit Ethernet line card may not come up.
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(23)S1 after you enter the shutdown interface configuration command followed by the
no shutdown interface configuration command on the interface.
Workaround: Reload microcode onto the line card.
First Alternate Workaround: Unplug the cable of the line card, and then plug it in again.
Second Alternate Workaround: Enter the shutdown interface configuration command followed by
the no shutdown interface configuration command on the back-to-back interface.
•
CSCdz88744
Symptoms: A Gigabit Ethernet Engine 2 or an Engine 4 plus line card may reload when you perform
an online insertion and removal (OIR) of the Clock and Scheduler Card (CSC).
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0 S.
Workaround: There is no workaround.
•
CSCea00642
Symptoms: A 24-port channelized E1/T1 line card may produce a traceback, and the serial interface
may not come up.
Conditions: This symptom is observed on a Cisco 10000 series when you change the mode on the
line card from E1 to T1.
Workaround: There is no workaround.
•
CSCea01869
Symptoms: If a 3-port Gigabit Ethernet (GE) Engine 2 (E2) line card is configured for dot1q VLAN
operation and an inbound access control list (ACL) is applied to the main interface, the line card will
be paused by the Gigabit Route Processor (GRP), reporting Fabric Unicast timeout errors. Note that
3-port GE E2 line cards do not support per subinterface ACL processing.
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(24)S or a later release with both normal and extended ACLs. The line card will
continue to pause until the ACL is either removed from the interface configuration or ACL is
removed from the configuration using the no access- list access-list-number global configuration
command.
Workaround: There is no workaround.
•
CSCea04669
Symptoms: When you use the break key to reset the secondary Gigabit Route Processor (GRP) on a
Cisco 12000 series that is configured with two GRPs, the primary GRP may first pause and then
reload when the following watchdog timeout occurs:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout process = Fabric ping
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1990
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S1
This situation may impact the process of replacing a defective secondary GRP.
Conditions: This symptom is observed regardless of the redundancy mode (Route Processor
Redundancy [RPR], Route Processor Redundancy Plus [RPR+], or Stateful Switchover [SSO]).
Workaround: There is no workaround.
•
CSCea04756
Symptoms: “IBC divert PAK” and “Camr-3-INTPROC” errors may occur.
Conditions: This symptom is observed on a Cisco 10720 router.
Workaround: There is no workaround.
•
CSCea06591
This caveat is closed.
Symptoms: When you apply a 448-line access control list (ACL) on an Engine 2 (E2) line card to
control outbound traffic, Cisco Express Forwarding (CEF) may be disabled on the E2 line card and
on other E2 line cards in the chassis.
Conditions: This symptom is observed on a Cisco 12000 series when there are about 200,000 Border
Gateway Protocol routes and is about 3,000 Interior Gateway Protocol (IGP) (or Intermediate
System-to- Intermediate System [IS-IS]) routes. All E2 line cards have 256 MB of memory.
Workaround: To prevent CEF from being disabled, and to minimize usage of packet switch
application-specific integrated circuit (ASIC) (PSA) memory, enter the access-list hardware psa
limit 128 global configuration command. Doing so enables all ACL lines to be processed at the CPU
of the line card.
•
CSCin14188
Symptoms: The ifIndex Persistence feature does not function after a switchover.
Conditions: This symptom is observed in a high availability (HA) Stateful Switchover (SSO)
environment.
Workaround: To reenable the ifIndex Persistence feature, enter the write memory EXEC command
after the switchover.
•
CSCin27782
Symptoms: Permanent virtual circuits (PVCs) that are managed by Operation, Administration, and
Maintenance (OAM) cells may not come up.
Conditions: This symptom is observed on an 8-port ATM Inverse MUX T1 port adapter
(PA-A3-8T1IMA) or an 8-port ATM Inverse MUX E1 port adapter (PA-A3-8E1IMA) that is
installed in a Cisco 7200 series or Cisco 7500 series router that is running Cisco IOS
Release 12.2(13)T or a later release, or Release 12.0 S.
Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(23)S1
Cisco IOS Release 12.0(23)S1 is a rebuild of Cisco IOS Release 12.0(23)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(23)S1 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
•
CSCdp15126
Symptoms A packet that is destined for a next hop may not be policy-routed.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1991
Resolved Caveats—Cisco IOS Release 12.0(23)S1
Conditions These symptoms are observed when you enable policy routing on a Fast Ethernet
Inter-Switch Link (ISL) subinterface.
Workaround There is no workaround.
•
CSCdt38855
Symptoms A Cisco 7200 series router that has data-link switching (DLSw) configured may reload
because of a software condition.
Conditions This symptom is observed on a Cisco 7200 series router that is running Cisco IOS
Release 12.0(15) when DLSw with TCP encapsulation is sent over an X.25 network and when an
X.25 transmission attempt fails because packets are dropped.
Workaround There is no workaround.
•
CSCdv49909
Symptoms Parallel links may not be used efficiently on a Cisco router when Multiprotocol Label
Switching (MPLS) traffic is load balanced over parallel links to a customer premises equipment
(CPE) device.
Conditions This symptom is observed when a Virtual Private Network (VPN) routing and
forwarding (VRF) static route to a remote loopback interface is configured and both parallel links
to the same CPE device are configured to the same loopback interface without an IP address using
the ip unnumbered interface configuration command.
Possible Workaround Define the following configurations on the provider edge (PE) and customer
edge (CE) routers to achieve load balancing with static VRF routes.
PE Configuration
interface multilink250
ip vrf forwarding YELLOWVPN
ip address 10.0.0.1 255.255.255.0
interface multilink251
ip vrf forwarding YELLOWVPN
ip address 10.1.0.1 255.255.255.0
The links in the CE configuration must be configured with 10.0.0.2 and 10.1.0.2.
10.10.0.1/32 is the CE loopback and must be advertised to the PE via Routing Information Protocol
(RIP) or with another router protocol. A static route may be used.
CE Configuration:
ip route vrf YELLOWVPN 10.10.0.1 255.255.255.255 10.0.0.2
ip route vrf YELLOWVPN 10.10.0.1 255.255.255.255 10.1.0.2
The following output defines static routes for the CE prefix:
ip route vrf YELLOWVPN 192.168.200.0 255.255.255 0 10.10.0.1
•
CSCdw67052
Symptoms The ATM traffic in a Cisco 12000 series ATM Quad OC-3 line card with Segmentation
and Reassembly (SAR) 3.1.3 may not work properly. Cell drops may occur in the background traffic
because of the usage parameter control (UPC) configuration in the ATM switch. The ping timeout
may be 15 out of 1000 pings, with a packet size of 18,000 bytes.
Conditions These symptoms are observed on a Cisco 12000 series router with the UPC on the ATM
switch set to “DROP.” (The symptoms are not observed on a Cisco 7200 series routers or a
Cisco 7500 series routers under the same scenario.)
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1992
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S1
The symptoms occur when the ATM variable bit rate-non-real time (VBR-NRT) permanent virtual
circuit (PVC) has a peak cell rate (PCR) of 46, the sustainable cell rate (SCR) is set to 23, and the
maximum burst size (MBS) is set to 100.
Workaround Reduce the MBS by about 10 percent, for example, to 90.
•
CSCdx67497
Symptoms Source/destination pairs may not be switched in hardware and may receive degraded
service.
Conditions This symptom is observed when IP version 6 (IPv6) load balancing is performed with
3 paths on a Cisco 12000 series Engine 3 line card and occurs on source/destination pairs that hash
to 15. The symptom does not occur when load balancing is performed with 1, 2, 5, or 8 paths.
Workaround There is no workaround.
•
CSCdx87577
Symptoms Memory allocation failures occur on a Cisco router that has authentication, authorization,
and accounting (AAA) configured, and “%SYS-2- MALLOCFAIL” messages are displayed. When
you enter the show memory summary command, the command output shows that many small
blocks are used by the AAA processes.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(15)S3.
Workaround There is no workaround.
•
CSCdx94479
Symptoms The convergence time after four Stateful Switchovers (SSOs) on a Cisco 10000 series
edge services router is 11 seconds but should never be longer than 10 seconds.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdy22528
Symptoms Configuring 6000 Access Control Entry (ACE) entries or more in an access control list
(ACL) causes Cisco IOS software to reload.
Conditions This symptom is observed on a Cisco 10000 series router that is configured with a
Performance Routing Engine 1 or 2 (PRE1 or PRE2).
Workaround There is no workaround.
•
CSCdy27414
Symptoms An interface of a Cisco 10000 series channelized T3 (CT3) line card may not dequeue
packets. When the link on a CT3 card flaps, one or more interfaces may not recover. The output
queue of the interface may become full with PPP/High-Level Data Link Control (HDLC) packets
and may stay in the “Up/Down” state.
Conditions These symptoms are observed when a chip of a third-party vendor on a Cisco 10000
series CT3 line card is defective.
Workaround There is no workaround; return the CT3 line card for repair.
The fix for this caveat adds a software procedure that periodically checks if the pointers that link the
partial packet buffer RAM blocks are becoming corrupted. When a corrupted pointer is detected, the
associated interface is removed and then replaced, which may cause the interface to be incapable of
transmitting traffic for up to 10 seconds. When this condition is detected and repaired, a message is
logged to the Route Processor and the line card log to notify the user.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1993
Resolved Caveats—Cisco IOS Release 12.0(23)S1
•
CSCdy33457
Symptoms A Cisco 12000 series Engine 0 (E0) Packet-over-SONET (POS) line card reloads and
causes the router to lose all its routes. A back-to-back ping on other line cards fails and causes Open
Shortest Path First (OSPF) Border Gateway Protocol (BGP) to go down.
Conditions These symptoms are observed when you change the maximum transmission unit (MTU)
of a port channel while traffic is flowing.
Workaround Reload the E0 POS line card.
•
CSCdy34113
Symptoms A Cisco 7500 series router may reload at a packet enqueue utility.
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(22)S when all of the following conditions are met:
– A Frame Relay (FR) link is configured on a Versatile Interface Processor (VIP) interface.
– Frame Relay Traffic Shaping (FRTS) is enabled for FR circuits via the map-class frame-relay
global configuration command, and distributed traffic shaping is not enabled on the Route
Switch Processor (RSP).
– You deencapsulate the interface by using the no encapsulation frame-relay interface
configuration command, and you unconfigure the interface by entering the no map-class
frame-relay global configuration command.
– While you unconfigure FRTS, FR encapsulation occurs, and the traffic load is still high so that
the shaping function is activated and outbound packets on per-virtual circuit (VC) queues are
throttled.
Workaround Avoid the situation in which all of the above-mentioned conditions take place
concurrently. For example, when an FR link is configured on a VIP interface and you require traffic
shaping, use distributed FRTS, or unconfigure FRTS while user traffic is low so as not to activate
the shaping function.
•
CSCdy36665
Symptoms Operation, Administration, and Maintenance (OAM)-managed permanent virtual circuits
(PVCs) on an 8-port T1 ATM port adapter with Inverse Multiplexing over ATM (IMA).
(PA-A3-8T1IMA) or an 8-port E1 ATM port adapter with IMA (PA-A3-8E1IMA) may not come up
as expected.
Conditions This symptom is observed on a PA-A3-8T1IMA or a PA-A3-8E1IMA of a Cisco 7200
series or Cisco 7500 series router that is running Cisco IOS Release 12.2(11.5)T or a later release.
Workaround There is no workaround.
•
CSCdy40021
Symptoms Reassembly table entries may indicate incorrectly that they are still active following the
removal of an associated Multilink PPP (MLP) configuration.
Conditions This symptom is observed when you remove a large MLP configuration in a single step,
that is, when you use a single configuration file to shut down the bundle and remove the bundle from
the running configuration.
Workaround Use one configuration file to shut down the bundle and another (separate and unique)
configuration file to remove the bundle from the running configuration.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1994
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S1
•
CSCdy43435
Symptoms Virtual Private Network routing/forwarding (VRF) does not function properly on a
Frame Relay link between a provider edge (PE) router and a customer edge (CE) router, and the CE
router cannot ping the PE router.
Conditions These symptoms are observed on a Frame Relay link between a Cisco 10000 series
router that is functioning as a PE router and another Cisco 10000 series router that is functioning as
a CE router.
Workaround Reload the PE router to make the link between the PE router and the CE router
function.
•
CSCdy51151
Symptoms When a Cisco 12000 series Engine 3 line card receives a tag packet with an IP version 4
(IPv4) packet that has options underneath it or with a non-IPv4 packet such as an IP version 6 (IPv6)
packet, the packet may be send to the line card CPU for processing.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)ST2.
Workaround There is no workaround.
•
CSCdy54337
Symptoms An interface on a 2-port Fast Ethernet port adapter (PA-2FE) may stop transmitting if this
interface or the other interface on the same port adapter goes down or flaps under a heavy traffic
load. The interface that stops transmitting may display the following messages:
%RSP-3-RESTART: interface FastEthernet3/0/0, not transmitting
%RSP-3-RESTART: interface FastEthernet3/0/0, output frozen
%RSP-3-RESTART: cbus complex
Conditions This symptom is observed on the PA-2FE on a Cisco 7500 series Versatile Interface
Processor 4 (VIP4) that is configured with Fast Ether Channel (FEC). This symptom is observed
when the port adapter is carrying a heavy traffic load and when part of the traffic is originating from
a port adapter (PA-A3) that is located on the same VIP.
Workaround There is no workaround.
•
CSCdy57048
Symptoms A Telnet session from a terminal over a vty connection to a Cisco 7206VXR router may
pause indefinitely.
Conditions This symptom is observed on a Cisco 7206VXR router that is running Cisco IOS
Release 12.2(4)XZ5, that is configured with a Network Processing Engine 300 (NPE-300), and that
is functioning as a Multiprotocol Label Switching Virtual Private Network (MPLS VPN) provider
edge (PE) router when large text displays are dumped on the screen of the terminal.
The symptom is caused by a corrupt TCP Telnet packet that is generated by the router.
Workaround There is no workaround.
•
CSCdy58872
Symptoms Pins across a link bundle fail when the attached line cards are either 1-port or 3-port
Gigabit Ethernet line cards.
Conditions This symptom is observed on a connection between two Cisco 12000 series routers with
at least one of the routers configured with a Next Generation Release Process (NGRP). The
symptom occurs on the c12kprp-p-mz image of Cisco IOS Release 12.0(22.3)S and later releases.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1995
Resolved Caveats—Cisco IOS Release 12.0(23)S1
•
CSCdy61234
Symptoms Many interprocess communications (IPC) messages are sent to a Cisco 12000 series
Gigabit Ethernet (GE) line card, and the nonblocking IPC command queue becomes full.
Conditions These symptoms are observed on a Cisco 12000 series router that is configured with a
GE line card when you use TFTP to copy a configuration with many VLANS (that is, 800 or more
VLANs) to the running configuration.
Workaround Copy the configuration with many VLANS to the startup configuration, and reload the
router.
•
CSCdy63771
Symptoms Virtual Private Network (VPN) routing/forwarding (VRF) may not function on a
High-Speed Serial Interface (HSSI) port adapter.
Conditions This symptom is observed on a Cisco 7500 series router.
Workaround Remove and reconfigure the affected subinterface on the HSSI port adapter.
•
CSCdy64917
Symptoms A Cisco 12000 series Engine 2 line card may reload.
Conditions This symptom is observed when traffic engineering (TE) metric is used.
Workaround There is no workaround.
•
CSCdy65658
Symptoms A policy map with multiple class maps does not synchronize correctly with a standby
Route Processor (RP).
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround Reload the standby RP.
•
CSCdy67945
Symptoms When you enter a loopback remote line interface configuration command on a 6-port
channelized T3 line card, the command may fail and may cause a T1 connection to flap.
Conditions This symptom is observed on both American National Standards Institute (ANSI) and
Bell Communications Research (Bellcore) loopbacks on networks that are sensitive to T1 framing
errors.
When you enter the loopback remote line interface configuration command, the line card causes a
brief change of frame alignment (COFA) error. Normally, this error goes unnoticed. However, some
devices react to these errors with an alarm indication signal (AIS). Each time the loopback request
is initiated (that is, if the T1 connection is configured for remote loopbacks each time the T1
connection comes up), the AIS brings the T1 connection down.
Workaround There is no workaround.
•
CSCdy68292
Symptoms The following error messages may be generated on a Cisco 12000 series Engine 4 plus
(E4+) OC-192 line card:
SLOT 6: %RX192-3-HINTR: status = 0x4000000, mask = 0x7EFFFF FF - Parity error on
rx_pbc_mem.
-Traceback= 4039CEF0 4044ECEC 400C85B0
SLOT 6: %SYS-2-INTSCHED: ’sleep for’ at level 7
-Process= "CEF IPC Background", ipl= 7, pid= 52
-Traceback= 400CABB8 400B9D24 403F5EB0 4044E040 400CEAE4 400C7108
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1996
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S1
SLOT 6: %SYS-2-INTSCHED: ’sleep for’ at level 7
-Process= "CEF IPC Background", ipl= 7, pid= 52
-Traceback= 400CABB8 400B9D24 403F5EB0 4044E040 400CEAE4 400C7108
Cisco Express Forwarding (CEF) on the E4+ OC-192 line card may become disabled, and the
associated port stays in an “Up/Up” state.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-k4p-mz
image of Cisco IOS Release 12.0(21)S3 or the gsr-p-mz image of Cisco IOS Release 12.0(21)ST2.
Workaround Enter the microcode reload slot-number global configuration command on the E4+
OC-192 line card.
•
CSCdy73102
Symptoms When a primary Multiprotocol Label Switching traffic engineering (MPLS TE) tunnel
reoptimizes over another link, a traffic drop may occur.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S1 following a Fast Reroute (FRR) operation.
Workaround Configure the primary label switched path tunnel (LSP tunnel) as an explicit tunnel.
•
CSCdy73244
Symptoms Guarantees may not be achieved for some classes for a certain combination of bandwidth
assignments within a service policy.
Conditions This symptom is observed when you use the following bandwidth allocation: class 1,
8 kbps; class 2 64 kbps; class 3 16 kbps; class 4 14 kbps; parent class, 120 kbps.
Workaround Sightly adjust the bandwidth of one of the classes. In the above example, changing
class 3 to 14 kbps or class 4 to 16 kbps would solve the situation.
•
CSCdy76986
Symptoms Distributed switching may not function for packets.
Conditions This symptom is observed on a distributed multilink interface on a Cisco 7500 series
router that is running Cisco IOS Release 12.0(22.4)S1.
Workaround There is no workaround.
•
CSCdy77591
Symptoms On a Cisco 7500 router that is configured for High Availability, when you enter the
shutdown interface configuration command on a serial interface, the following error message is
displayed on the standby Route Processor (RP) and the standby RP reloads:
%HA-2-CCB_PLAYBACK_ERROR: CCB playback failed.
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0 S.
Workaround There is no workaround.
•
CSCdy78371
Symptoms An Engine 2 Quad OC-12 line card that has interfaces configured for Virtual Private
Network (VPN) and that has a Frame Relay subinterface may reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22.4)S1 when a microcode bundle is configured and loaded onto
the Engine 2 Quad OC-12 line card.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1997
Resolved Caveats—Cisco IOS Release 12.0(23)S1
•
CSCdy78970
Symptoms A Cisco 12000 series Engine 2 line card may generate the following error messages:
SLOT 14: %LCPOS-3-SOP: TX:BadLenCtr. Source=0x1 (Plim), halt_minor0=0x8001 (1000 0000
0000 00sl, s/l=TooShort/long)
SLOT 14: %GSR-3-INTPROC: Process Traceback= 400CCE60 400C90F0 40010A24
-Traceback= 4033F424 4044ED54 400C88B0
Conditions This symptom is observed when you remove and reinsert switch fabric on a Cisco 12000
series router while traffic is flowing.
Workaround There is no workaround.
•
CSCdy80866
Symptoms When you configure more than 64 Inter-Switch Link (ISL) VLANs, a Versatile Interface
Processor (VIP) may reload.
Conditions This symptom is observed on a Cisco 7500 series router.
Workaround Use only dot1q encapsulation.
•
CSCdy86210
Symptoms NetFLow stops functioning after an online insertion and removal (OIR) of a switch fabric
card (SFC).
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround Disable and reenable the ip route-cache flow sampled interface configuration
command.
•
CSCdy89001
Symptoms An Engine 4 Packet-over-SONET (POS) line card reloads.
Conditions This symptom is observed on an Engine 4 Packet-over-SONET (POS) line card in a
Cisco 12000 series Internet router during several online insertion and removal (OIR) procedures on
a Clock Scheduler Card (CSC).
Workaround There is no workaround.
•
CSCdy89041
Symptoms A memory leak of about 0.5 MB occurs in the “Pre Command NV Buffer” process.
Conditions This symptom is observed when you connect to a Cisco 12000 series Route Processor
(RP) through a vty.
Workaround There is no workaround.
•
CSCdy89663
Symptoms A Cisco 12000 series router may reload when an interface flaps.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S during multicast traffic.
Workaround There is no workaround.
•
CSCdz00085
Symptoms A Cisco router that is functioning as a provider edge (PE) router may install an outgoing
point of presence (POP) label instead of an outgoing aggregate label for a connected Virtual Private
Network (VPN) routing/forwarding (VRF) route.
Conditions This symptom is observed in a carrier supporting carriers topology with a Cisco router
that is running Cisco IOS Release 12.2(12.10)T1 and that is functioning as a PE router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
1998
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S1
Temporary Workaround Enter the shutdown interface configuration command followed by the no
shutdown interface configuration on the VRF interface until the symptom occurs again.
Alternate Temporary Workaround Reload the router. However, after having done so, when you enter
the shutdown interface configuration command followed by the no shutdown interface
configuration command on the VRF interface the symptom will occur again.
•
CSCdz02817
Symptoms The Binary Synchronous Communications (Bisync) IP (BIP) counter displays a value of
46623 instead of 5.
Conditions This symptom is observed on a Cisco 10000 series 4-port channelized OC-3 line card.
Workaround There is no workaround.
•
CSCdz07354
Symptoms Enhanced Interior Gateway Routing Protocol (EIGRP) resets the routing table when you
enter the write memory EXEC command, write terminal EXEC command, or show
running-config privileged EXEC command.
Conditions This symptom is observed on a Cisco 7505, Cisco 7507, and Cisco 7513 router.
Workaround There is no workaround.
•
CSCdz07393
Symptoms When you apply a combination of IP version 6 (IPv6), an access control list (ACL), and
Sampled NetFlow to an interface on an Engine 4 plus line card, the line card may reload.
Conditions This symptom is observed while IPv6 traffic is flowing.
Workaround There is no workaround.
•
CSCdz08851
Symptoms Resource Reservation Protocol (RSVP) Hello detection may not trigger a Fast Reroute
(FRR) switchover.
Conditions This symptom is observed when you use RSVP Hello detection to enable Multiprotocol
Label Switching traffic engineering (MPLS TE) FRR protection on shared interfaces.
Workaround There is no workaround.
•
CSCdz09657
Symptoms An IP version 6 (IPv6) automatic tunnel cannot be created.
Conditions This symptom is observed on a Cisco 12000 series router when you reload the router
after you have enabled the tunnel mode ipv6ip auto-tunnel command and have saved the command
in the startup configuration. The tunnel interface is not enabled for IPv6, and the routing table does
not show the correct route nor a static route to the tunnel.
Workaround Enter the no tunnel source type number interface configuration command followed by
the tunnel source type number interface configuration command on the tunnel interface.
•
CSCdz11618
Symptoms Counters for policy-based routing (PBR) update at an incorrect route map.
Conditions This symptom is observed when matching conditions are not defined for a route map.
Workaround When matching conditions are not defined for a route map, the situation is treated as a
“permit ip any any” condition; assign the access-list access-list-number permit ip any any global
configuration command as the matching condition for the route map.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
1999
Resolved Caveats—Cisco IOS Release 12.0(23)S1
•
CSCdz12053
Symptoms The entPhysicalParentRelPos MIB object does not return the correct value for the
physical slots in a Cisco 10000 series router chassis.
Conditions This symptom is observed on a Cisco 10000 series router that is running the
c10k-p10-mz image of Cisco IOS Release 12.0(23)S.
Workaround There is no workaround.
•
CSCdz14160
Symptoms A Cisco 12000 series Route Processor (RP) may reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(23)S during Fast Reroute (FRR) testing.
Workaround There is no workaround.
•
CSCdz14266
Symptoms When you change a class queue from low latency queueing (LLQ) to non-LLQ, or the
other way around, or when you simply remove and recreate a class queue, the queue of the next class
disappears, as is displayed in the output of the show hardware pxf cpu queue interface privileged
EXEC command.
Conditions This symptom is observed on a Cisco 10000 series router when you change or create a
class queue using the no priority policy-map class configuration command followed by the priority
policy-map class configuration command or using the no bandwidth policy-map class
configuration command followed by the bandwidth policy-map class configuration command.
Workaround There is no workaround.
•
CSCdz18265
Symptoms A static crossconnect setup may fail.
Conditions This symptom is observed when you configure a static crossconnect that is using an
interface that is down. When the interface comes up, the static crossconnect is not set up in the Label
Forwarding Information Base table.
Workaround Remove the static crossconnect using the no mpls static crossconnect global
configuration command and reapply the static crossconnect using the mpls static crossconnect
global configuration command.
•
CSCdz19881
Symptoms An input access control list (ACL) may not take effect.
Conditions This symptom is observed on a Cisco 12000 series Engine 4 plus interface on which the
VRF Selection feature is enabled.
Workaround There is no workaround.
•
CSCdz20079
Symptoms Configuring the hw-module slot shutdown global configuration command in the startup
configuration may cause a router to reload.
Conditions This symptom is observed on a Cisco 10000 series router when you attempt to boot from
an eboot image.
Workaround Do not configure the hw-module slot shutdown global configuration command in the
startup configuration.
Alternate Workaround Change the configuration register to “0x40” to ignore the configuration during
the bootup process.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2000
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S1
•
CSCdz21278
Symptoms A destination interface may not have a value in the NetFlow cache (that is, the destination
interface may be null), but it should have a value.
Conditions This symptom is observed when the egress interface is on a Cisco 12000 series Engine 0
line card and a rate limit access list is applied to the egress interface. The rate limit access list may
not cause packets to be dropped, but the destination interface is null in the NetFlow cache.
Workaround Disable the rate limit on the output interface.
•
CSCdz23286
Symptoms A Cisco 12000 series router may reload during the bootup process.
Conditions This symptom is observed when you attempt to boot up the Cisco 12000 series router
with an image of Cisco IOS Release 12.0(23)S and occurs before the image is loaded onto the router.
Workaround There is no workaround.
•
CSCdz27562
Symptoms Executing an snmpwalk command on loopback interfaces does not yield any results.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround Execute the snmpwalk command on the physical interfaces instead.
•
CSCdz31778
Symptoms Slow path forwarding on an Engine 3 line card of a provider edge (PE) router that is
running IP version 6 (IPv6) in a Multiprotocol Label Switching (MPLS) environment (also referred
to as a 6PE router) may not function.
Conditions This symptom is observed on a Cisco 12000 series router that is functioning as a 6PE
router and occurs because the 6PE disposition does not function for aggregate 6PE labels on the
Engine 3 line card.
Workaround There is no workaround.
•
CSCdz37224
Symptoms “Alpha” error messages may be observed on the ingress or egress interface of a
Cisco 12000 series 4-port OC-12c/STM-4c Packet over SONET (POS) synchronous digital
hierarchy IP services engine line card. The following messages may be displayed on the egress
interface of the Cisco 12000 series 4-port OC-12c/STM-4c POS synchronous digital hierarchy IP
services engine line card:
%EE48-3-ALPHAERRS: TX ALPHA: ALPHA_CPU_PIPELINE_CTRL_INT error 1 SLOT 2:
%EE48-3-ALPHAPAIR: TX ALPHA: POP PAIR
Conditions This symptom is observed if the shape, bandwidth, random detect, or priority value is
configured and if both the set ip-dscp-value quality of service (QoS) policy map configuration
command and the set mpls experimental policy map configuration command are disabled. This
symptom is observed on a Cisco 12016 router that is running the gsr-p-mz image of Cisco IOS
Release 12.0(21)S or Release 12.0(21)ST2a.
Workaround Remove the transmit (TX) service policy and use Per Interface Rate Control (PIRC)
instead.
Additional Notes The same symptom may occur when an error recovery is performed for hardware
failures such as data path parity errors. The symptom under those circumstances would be a failed
recovery. There is no workaround for the occurrence of this symptom when an error recovery is
performed.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2001
Resolved Caveats—Cisco IOS Release 12.0(23)S1
•
CSCdz38742
Symptoms There may not be any label bindings on a Label Switch Router (LSR), but a Label
Distribution Protocol (LDP) session may not be impaired.
Conditions This symptom is observed when an LDP session flaps quickly.
Workaround After you have brought down the LDP session, remove all label bindings, and bring the
session up again.
•
CSCdz39560
Symptoms Multiprotocol Label Switching (MPLS) Fast Reroute (FRR) may not function properly
on an Engine 2 ingress line card.
Conditions This symptom is observed on a Cisco 12000 series router when a tunnel that is protected
by FRR is a one-hop tunnel to a second router. A third router that is connected to the first and second
router provides the backup path. When the primary path between the first and second router goes
down, traffic is not redirected over the backup path.
Workaround There is no workaround.
•
CSCin20514
Symptoms A Cisco 7200 series or Cisco 7500 series router may reload because a packet is not
cleaned up properly.
Conditions This symptom is observed under rare circumstances when the Cisco 7200 series or
Cisco 7500 series router is configured for Multiprotocol Label Switching (MPLS) through a 1-port
Gigabit Ethernet port adapter (PA-GE) or an Enhanced Gigabit Ethernet Interface Processor
(GEIP+).
Workaround There is no workaround.
•
CSCin21259
Symptoms The ENTITY MIB fails to recognize redundant power supplies and recognizes only one
power supply. In addition, the power supply, fans, and chassis interface are displayed as non
field-replaceable units (non-FRUs).
Conditions This symptom is observed on a Cisco 7507 and a Cisco 7513 router.
Workaround There is no workaround.
•
CSCuk37313
Symptoms When you configure an IP version 6 (IPv6) access list to match Encapsulated Security
Payload (esp) or Authentication Header Protocol (ahp) protocol literal values, the access list appears
to be configured to match IPv6 only.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCuk37975
Symptoms A router may reload while applying an Access Control List (ACL) to forwarded traffic
via the ipv6 traffic-filter interface configuration command.
Conditions This symptom is observed when you enter illegal syntax in the submode of the ipv6
access-list global configuration command.
Workaround Do not enter illegal syntax in the submode of the ipv6 access-list global configuration
command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2002
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCuk39337
Symptoms Virtual Private Network routing/forwarding (VRF) does not function properly on a
Frame Relay link between a provider edge (PE) router and a customer edge (CE) router, and the CE
router cannot ping the PE router.
Conditions These symptoms are observed on a Frame Relay link between a Cisco 10000 series
router that is functioning as a PE router and another Cisco 10000 series router that is functioning as
a CE router.
Workaround Reload the PE router to make the link between the PE router and the CE router
function.
Resolved Caveats—Cisco IOS Release 12.0(23)S
All the caveats listed in this section are resolved in Cisco IOS Release 12.0(23)S. This section describes
only severity 1, severity 2, and select severity 3 caveats.
Basic System Services
•
CSCdw91761
Symptoms A Cisco 7200 series router reloads because of a bus error, a watchdog timeout, or an
unspecified error (that is, no reload error message is provided).
Conditions This symptom is observed on a Cisco 7200 series router that is configured with a
Network Processing Engine 200 (NPE-200), a PA-A1 port adapter, and a PA-FE port adapter when
a medium to high traffic load occurs and the traffic load consists of large packet sizes.
Workaround Reduce traffic.
Alternate Workaround Use another model Network Processing Engine.
•
CSCdx39018
Symptoms The ifOutOctets counter may decrease over a five-minute interval, but the counter is still
accurate on a long term basis.
Conditions This symptom is observed on a Cisco 7500 series router when quality of service (QoS)
is configured on the egress Versatile Interface Processor (VIP)
Workaround Disable QoS.
•
CSCdx47520
Symptoms Simple Network Management Protocol (SNMP) ifIndexes may change after a
switchover. This situation may occur when the bulk-synchronization of SNMP ifIndexes does not
function.
Conditions This symptom is observed on a Cisco 7500 series router, Cisco 10000 series router, and
Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdx68230
Symptoms A CPU hog condition may be observed on a router, and the router may reload.
Conditions These symptoms are observed when the snmp-server community global configuration
command is executed on a Cisco router that is running Cisco IOS Release 12.1 and that has several
thousand logical entities configured.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2003
Resolved Caveats—Cisco IOS Release 12.0(23)S
Workaround There is no workaround.
•
CSCdx76361
Symptoms A router that is configured with a Route Switch Processor (RSP) drops multicast packets,
which situation leads to a loss of connectivity.
Conditions This symptom is observed in a bridging environment, when the router that is configured
with the RSP is running the rsp-jsv-mz image of Cisco IOS Release 12.2(10.7)T1 or
Release 12.2(11.2) and the subscriber trunk is configured with a multicast policy that is set to
“permit.”
Workaround There is no workaround.
•
CSCdx94801
Symptoms When you configure a Cisco 12000 series Internet router with ATM interfaces, the
secondary Route Processor (RP) reloads.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx96327
Symptoms A router may reload if the no ip routing interface configuration command is configured
on a router that has NetFlow configured.
Conditions This symptom is observed on a router while traffic is flowing through the router on the
interface that has NetFlow configured.
Workaround Remove NetFlow before entering the no ip routing interface configuration command,
or stop traffic from going through the interface that has NetFlow configured before entering the no
ip routing interface configuration command.
•
CSCdy02831
Symptoms A Multilayer Switch Feature Card 2 (MSFC2) may reload when the no ip routing global
configuration command is entered.
Conditions This symptom is observed on a Catalyst 6000 MSFC2 that is running Cisco IOS
Release 12.1(12)E.
Workaround Do not disable IP routing on the MSFC2.
•
CSCdy06086
Symptoms The snmp-server host host-addr version 2c community-string global configuration
command cannot be configured if the community-string argument is already configured via the
snmp-server community string global configuration command.
Conditions This symptom is observed in Cisco IOS Release 12.0 S and is related to the introduction
of the SNMP Support for VPNs feature.
Workaround There is no workaround.
•
CSCin15495
Symptoms The output counters that are associated with an interface may remain zero, even though
traffic is passed through the interface.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2004
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCuk36939
Symptoms Cisco IOS software fails to set up the Gigabit Ethernet Interface Processor (GEIP) MIBs
correctly on a Cisco 7500 series router.
Conditions This symptom is observed when the hierarchy on the GEIP is incorrect; the port adapter
and interface are shown at the same level as the GEIP. The GEIP should be at the top of the hierarchy,
followed by the port adapter, followed by the interface.
Workaround There is no workaround.
EXEC and Configuration Parser
•
CSCdy27230
Symptoms The router isis global configuration command is not properly synchronized to a standby
Route Processor (RP). This situation prevents the standby RP from loading the correct
configuration.
Conditions This symptom is observed when a router is running in redundancy mode.
Workaround There is no workaround.
•
CSCdy53980
Symptoms The Open Shortest Path First (OSPF) network ip-address wildcard-mask area area-id
router configuration command is accepted in an active Route Processor (RP) but not properly
synchronized to the standby RP. The first command that you enter is synchronized correctly to the
standby RP, but commands that are subsequently entered are not properly synchronized to the
standby RP.
Conditions This symptom is observed on a Cisco 12000 series router when Stateful Switchover
(SSO) is enabled.
Workaround There is no workaround.
Interfaces and Bridging
•
CSCdx53873
Symptoms Multiprotocol Label Switching (MPLS) packets that are greater than 1498 bytes may not
be received on a router.
Conditions This symptom is observed on a Cisco 7500 router that is running Cisco IOS
Release 12.2(10a) and that is using dot1q encapsulation.
Workaround There is no workaround.
•
CSCdx84574
Symptoms A Versatile Interface Processor (VIP) may reload and restart after a Fast Ethernet port
adapter (PA-FE) is installed.
Conditions This symptom is observed on a VIP that is installed in a Cisco 7500 series router.
Workaround There is no workaround.
•
CSCdx87818
Symptoms The following error message may be displayed on a router when a Cisco IOS software
upgrade is performed:
%SYS-6-STACKLOW: Stack for process ATM PA Helper running low, 0/3000
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2005
Resolved Caveats—Cisco IOS Release 12.0(23)S
Conditions This symptom is observed on a Cisco 7500 series router when you upgrade from
Cisco IOS Release 12.0(7)T to Release 12.1(14).
Workaround There is no workaround.
•
CSCdx87965
Symptoms A router that is configured with a multichannel port adapter reloads because of a bus error
exception.
Conditions This symptom is observed when link flaps occur or interfaces are reset on a router that
is configured with PA-MC-T1, PA-MC-E1, PA-MC-E3, or PA- MCX port adapters.
Workaround There is no workaround.
•
CSCdx91957
Symptoms The mtu interface configuration command changes into the ip mtu interface
configuration command when the VLAN ID changes on a subinterface of a Cisco 12000 series
3-port Gigabit Ethernet line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdy03204
Symptoms An Ethernet driver on an Ethernet interface may receive and forward packets that are not
destined for itself.
Conditions This symptom is observed on an Ethernet interface that has the promiscuous mode
enabled in a network that has multiple Hot Standby Router Protocol (HSRP) groups. This symptom
is also observed when no transparent bridging is occurring.
Workaround There is no workaround.
•
CSCdy09509
Symptoms A buffer leak may be observed in the small buffers on a router.
Conditions This symptom is observed on a Cisco 7200 series router that is running Cisco IOS
Release 12.2(10a) and that is using distributed Link Fragmentation and Interleaving (dLFI).
Workaround There is no workaround.
•
CSCdy38335
Symptoms A router that is configured with a 2-port Fast Ethernet 100BASE-FX port adapter
(PA-2FE-TX) may reload when the packet cleanup is not performed properly in the interrupt path
of the port adapter.
Conditions This symptom is observed on a Cisco 7200 series router and a Cisco 7500 series router.
Workaround There is no workaround.
•
CSCdy44854
Symptoms A router may be able to send but not be able to receive traffic via a Fast Ethernet
subinterface that is configured for dot1q encapsulation.
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(21)ST3.
Workaround Reload the router, or reload microcode onto the Versatile Interface Processor (VIP) by
entering the microcode reload slot-number global configuration command. Both workarounds
cause a traffic interruption.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2006
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy46927
Symptoms When you reload a Cisco 7500 series Versatile Interface Processor (VIP) or a
Cisco 12000 series line card that is configured with VLAN subinterfaces that are in a shutdown
state, the VLAN interfaces become active again.
Conditions This symptom is observed on distributed Cisco IOS platforms, such as the Cisco 7500
series router and the Cisco 12000 series router.
Workaround After the VIP or the line card has reloaded, enter the no shutdown interface
configuration command followed by the shutdown interface configuration command for the
affected subinterfaces.
•
CSCdy51470
Symptoms Label controlled ATM (LC-ATM) bindings may not come up after a Stateful Switchover
(SSO) is performed.
Conditions This symptom is observed on a Cisco 7500 series router that is configured with an
LC-ATM interface.
Workaround There is no workaround.
•
CSCdy51498
Symptoms A 1-port ATM Enhanced OC12/STM4 port adapter (PA-A3-OC12) that is configured
with multiple Low Latency Queueing (LLQ) streams that are running near peak cell rate (PCR) may
drop packets. The output of the show interfaces command displays that packets are sent out but that
no packets are coming in. Input or output packet drops are not displayed.
Conditions This symptom is observed during a test on a Cisco 7500 series router that is running
Cisco IOS Release 12.0(22)S.
Temporary Workaround Enter the clear interface type number EXEC command each time the
symptom occurs.
•
CSCin10839
Symptoms A router may reload after a channelized T3 (CT3) port adapter that is configured as part
of a Multilink PPP (MLP) bundle is removed, and the MLP bundle interface is shut down.
Conditions This symptom is observed in a network in which two Cisco 7200 series routers are
connected back-to-back via channelized T3 (CT3) port adapters. Channel groups are created and
configured for MLP, and a bundle interface multilink is created on both of the routers in this setup.
Workaround There is no workaround.
•
CSCin16706
Symptoms Open Shortest Path First (OSPF) multicast packets are not received on a 1-port Fast
Ethernet 100BASE-TX port adapter (PA-FE-TX).
Conditions This symptom is observed on a PA-FE-TX port adapter on a Cisco 7500 router that is
configured with OSPF. The PA-FE-TX does not receive OSPF multicast traffic because MAC
multicast entries are not added to the MAC table.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2007
Resolved Caveats—Cisco IOS Release 12.0(23)S
IP Routing Protocols
•
CSCdu43164
Symptoms A memory leak may occur on a Cisco 7200 series router. The memory leak is caused by
the Border Gateway Protocol (BGP) I/O process and occurs at the rate of 100 KB to 130 KB per
hour (about 2.5 MB to 3 MB per day) after the show memory summary | incl BGP privileged
EXEC command is entered. This situation occurs regardless of whether a BGP neighbor is flapping.
The output of the show processes memory | incl bgp privileged EXEC command shows the
following:
Router# show processes memory | incl bgp
PID TTY Allocated Freed Holding Getbufs Retbufs Process ... 104 0 3522569548
2139398320 21965976 297916 5184 BGP I/O ...
The show memory summary | incl bgp privileged EXEC command indicates that the “BGP (1)
update” function allocates memory without deallocating it again after the process is completed:
Router# show memory summary | incl bgp
Alloc PC Size Blocks Bytes What ... 0x607C42E0 65496 333 21810168 BGP (1) update ....
Conditions This symptom is observed on a Cisco 7206VXR router that is functioning as a Provider
Edge (PE) router and that is running Cisco IOS Release 12.1(5a) in a Multiprotocol Label Switching
Virtual Private Network (MPLS VPN) network.
Workaround Reload the router.
•
CSCdx32611
Symptoms After you detach an interface from a Virtual Private Network (VPN) routing/forwarding
(VRF) instance using the no ip vrf forwarding vrf-name command, the adjacency information that
is associated with the removed interface still shows up in the VRF table.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdx48854
Symptoms In a failover configuration of a designated router (DR) and a non-DR, the DR fails, does
not clear its connected flag, and continues to send Protocol Independent Multicast (PIM)
join messages upstream. This situation causes unnecessary traffic. Upon failback, the non-DR does
not clear its connected flag and continues to sends join-packet messages upstream long after the
outgoing interface list of the mroute entry becomes empty.
Conditions This symptom is observed in a failover configuration of a DR and a non-DR that have
directly connected receivers.
Workaround Clear the mroute entry.
•
CSCdx53795
Symptoms If a peer advertises a replacement path (with the same multi-exit discriminator [MED] as
the original path), the new path is inserted in the previous position of the original path.
Conditions This symptom may be observed on a Border Gateway Protocol (BGP) router that is using
deterministic MED. When this symptom occurs, the replacement path may not be grouped with
paths from the same autonomous system number (ASN). This ordering may result in incorrect
routing and may cause routing loops.
Workaround Disable and reenable deterministic MED on the router after the router enters the
incorrect state.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2008
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx70216
Symptoms A router may reload. Also, a Multilayer Switch Feature Card 2 (MSFC 2) may reload
with a bus error in the not so stubby area (NSSA) part of the Open Shortest Path First (OSPF) code.
Conditions This symptom is observed on any Cisco router that is running a Cisco IOS software
release when a link-state advertisement (LSA) with an incontiguous mask is sent to a router.
Workaround Do not send address LSAs with illegal masks, that is masks that are not contiguous, to
a router.
•
CSCdx74432
Symptoms Memory allocation (MALLOC) failures may be observed when Border Gateway
Protocol (BGP) updates are generated, and the following error message may be displayed:
%SYS-2-MALLOCFAIL: Memory allocation of 2093048 bytes failed from 0x602BDB08,
alignment 0 Pool: Processor Free: 1546596 Cause: Not enough free memory
Alternate Pool: None Free: 0 Cause: No Alternate pool
Conditions This symptom is observed on a Cisco router.
Workaround There is no workaround.
•
CSCdx74764
Symptoms A Performance Route Processor (PRP) can cause exception when trying to reload the
router.
Conditions This symptom is observed on a PRP that is running Cisco IOS Release 12.0(21)3S and
that has BGP/Interior Gateway Protocol (IGP) with Multiprotocol Label Switching-traffic
engineering (MPLS-TE).
Workaround There is no workaround.
•
CSCdx75987
Symptoms Tracebacks may occur.
Conditions This symptom is observed when you use the offset list router configuration command in
Enhanced Interior Gateway Routing Protocol (EIGRP) and when you remove a summary address
from an interface that has a Virtual Private Network (VPN) routing/forwarding (VRF) instance
defined.
Workaround There is no workaround.
•
CSCdx79227
Symptoms A router may reload after the show ip mroute summary EXEC command is entered.
Conditions This symptom is observed on Cisco router that is running Cisco IOS Release 12.2.
Workaround There is no workaround.
•
CSCdx83393
Symptoms A router may reload when the Sham-Link Support feature is configured.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2009
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx84465
Symptoms A router that has Fast Reroute (FRR) enabled may reload.
Conditions This symptom is observed when the input interface for a label switched path goes down
and the label switched path has not been fast rerouted at the previous hop (PHOP) or at a hop before
the PHOP.
Workaround There is no workaround.
•
CSCdx86622
Symptoms Enhanced Interior Gateway Routing Protocol (EIGRP) may log a spurious access.
Conditions This symptom is observed during a test on a Cisco 7500 series router that is running the
rsp-pv-mz image of Cisco IOS Release 12.0(21.4)SY.
Workaround There is no workaround.
•
CSCdx87316
Symptoms In rare circumstances, a downstream multicast router may have a group in the mroute
table, yet the upstream multicast router does not show the downstream multicast router in the
outgoing interface list.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Issue the clear ip mroute group interface configuration command.
•
CSCdx89413
Symptoms Subnets in the /31 range may not be accepted.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S.
Workaround There is no workaround.
•
CSCdy04712
Symptoms A router that is configured with the neighbor address or the neighbor ibgp peer-group
name nlri unicast multicast Border Gateway Protocol (BGP) commands does not automatically
translate the no auto-summary command into the multicast address family.
Conditions The symptom is observed on a Cisco router when more than one address family is used
under BGP.
Workaround Manually add the no auto-summary command into the multicast address family.
•
CSCdy28568
Symptoms A route reflector does not change the nexthop to itself, even when it is set to do so via a
route map.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdy42103
Symptoms A watchdog timeout may cause a software-forced reload on a router.
Conditions This symptom is observed on a Cisco 7500 router that is using the Border Gateway
Protocol (BGP).
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2010
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy44251
Symptoms The Forwarding Information Base (FIB) table on a Cisco 12000 series Gigabit Route
Processor (GRP) may be missing entries for directly connected subnets.
Conditions This symptom is observed on a Cisco 12000 series router after you have removed a large
number of routes.
Workaround Enter the clear ip route network EXEC command for the affected prefixes. The
following is an example:
Router# show ip cef 10.2.0.4 255.255.255.224
%Prefix not found
Router# clear ip route 10.2.0.4 255.255.255.224
Router# show ip cef 10.2.0.4 255.255.255.224
10.2.0.4/30, version 285154, epoch 0, attached, connected, cached adjacency to POS1/0
0 packets, 0 bytes via POS1/0, 0 dependencies valid cached adjacency
•
CSCdy51434
Symptoms A router may reload unexpectedly if MD5 authentication is used with Open Shortest Path
First (OSPF). The following message may be displayed when you enter the show version EXEC
command:
System returned to ROM by error - a Software forced crash, PC 0x12345678
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(22)S. The symptom occurs only when corrupted OSPF packets are present.
Workaround Remove MD5 authentication for OSPF.
ISO CLNS
•
CSCdy38827
Symptoms A Cisco router may install a suboptimal Intermediate System-to- Intermediate System
(IS-IS) route into its routing table. Depending on the topology, this situation may create a routing
loop.
Conditions This symptom is observed on an IS-IS Level 1 - Level 2 (L1L2) router that is running
Cisco IOS Release 12.0 S or Release 12.0 ST and that has prefixes configured that are allowed to be
leaked into Level 1, that is, prefixes that match the access list that is specified within the
redistribute isis ip level-2 into level-1 distribute-list command. When route leaking is not
configured, this condition is not observed.
Workaround There is no workaround. The condition resolves itself when the affected route is cleared
by entering the clear ip route network EXEC command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2011
Resolved Caveats—Cisco IOS Release 12.0(23)S
Miscellaneous
•
CSCdt41343
Symptoms A Cisco router may reload during the bootup process.
Conditions This symptom is observed when a syslog server and syslog source interface have been
defined before the source interface has been parsed and the configuration of the router is directly
written from TFTP to NVRAM memory or you upgrade from Cisco IOS Release 12.0 to
Release 12.1 or Release 12.2.
Workaround Place the syslog server and syslog source interface configurations after the source
interface itself. To do this, you must edit the configuration offline, copy it to NVRAM memory, and
then reboot the router.
•
CSCdv01994
Symptoms Memory allocation failures (MALLOCFAIL) may be observed on a router after it is
reloaded.
Conditions This symptom is observed on a Cisco 7500 series router.
Workaround There is no workaround.
•
CSCdv04641
Symptoms When you apply a crypto map to a tunnel interface that has the ip cef distributed global
configuration command enabled, a message very similar to the following one will appear:
Router(config)# interface Tunnel0
Router(config-if)# crypto map testtag
ERROR: The VIP interface must be configured with cef distributed switching before
enabling encryption.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdv11028
Symptoms A queue may become stuck and display messages that are similar to the following:
%GRP-3-FABRIC_UNI: Unicast send timed out %QM-4-STUCK: Port 0 Queue mask 0x1
Conditions This symptom is observed when an OC-48 Packet-over-SONET (POS) interface is
flapping and when updates are received.
Workaround Perform a microcode reload of the line card.
•
CSCdv23918
Symptoms Pattern loss may occur on a T1 channel that is configured under a Virtual Tributary
level 1.5 (VT1.5) stream on a router line card when you use the clock source internal controller
configuration command.
Conditions This symptom is observed on a Cisco 10000 series 1-port channelized OC-12 line card.
Workaround Use the clock source line controller configuration command.
•
CSCdw16580
Symptoms On a router that is configured as a provider edge (PE) router with multiple Virtual Private
Network (VPN) routing/forwarding (VRF) instances, the VRF routing table may not be imported to
the same PE router when routes are imported between the VRFs even when the PE router is
displayed on the Border Gateway Protocol (BGP) VPN4 table.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2012
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
Conditions This symptom is observed on a PE router in a Multiprotocol Label Switching (MPLS)
and VPN environment.
Workaround There is no workaround.
•
CSCdw50585
This caveat describes two symptoms, two conditions, and two workarounds:
Symptoms A The Egress NetFlow feature can be configured on a core Multiprotocol Label Switching
(MPLS) interface by using the mpls netflow egress command-line interface (CLI) command.
However, the Egress NetFlow feature is designed to work only on the outbound Virtual Private
Network routing/forwarding (VRF) interfaces of an MPLS network. Enabling it in any other
location should be considered a misconfiguration.
Conditions A Conditions do not apply to this situation.
Workaround A Do not configure the Egress NetFlow feature on any MPLS core interface. If the
feature is enabled on any MPLS core interface, enter the no mpls netflow egress command to
disable the feature.
Symptoms B IP packets that are looped back are wrongly accounted for. A new flow in the opposite
direction should be created for those IP packets.
Conditions B This symptom is observed on an outgoing MPLS egress flow.
Workaround B There is no workaround.
•
CSCdx01917
Symptoms Serial interfaces on a Cisco 10000 series 1-port channelized OC-12 line cards remain in
a Down/Down state after the router has reloaded and the interfaces are defined in the startup
configuration.
Conditions This symptom is observed when the startup configuration contains a large number of
serial interfaces that are defined on multiple 1-port channelized OC-12 line cards.
Workaround Delete and recreate the affected interfaces.
•
CSCdx35300
Symptoms A Gigabit Ethernet input queue may become wedged.
Conditions This symptom is observed on a Cisco 7400 router.
Workaround There is no workaround.
•
CSCdx38125
Symptoms Traceback messages may be displayed after the ip accounting mac-address input
interface configuration command is configured on VLANs that have an input access control list
(ACL) present. The counters that are based on the source and destination MAC address stop
incrementing after the traceback messages are observed.
Conditions These symptoms are observed on a 3-port Gigabit Ethernet line card when VLAN traffic
is coming in.
Workaround Remove the input ACL from the VLAN interface.
•
CSCdx42158
Symptoms A Buffer Management ASIC (BMA) error may occur, and the following messages are
displayed:
SLOT 2:00:10:20: %LC-3-BMAERRS: FrFab BMA PLIM error 100000
SLOT 2:00:10:20: %LC-3-BMAERR: FrFab BMA error: msstat 440340B2 dma0 800 dma1 0 dma2
0 qm 1FFFF8 plim 100000 fia 0 l3 0 ms 0 sdram 0
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2013
Resolved Caveats—Cisco IOS Release 12.0(23)S
Conditions This symptom is observed on a Cisco 12000 series 6-port channelized T3 line card and
2-port channelized OC-3 line card and occurs when a packet with zero length is received by the
BMA.
Workaround There is no workaround.
•
CSCdx45205
Symptoms Open Shortest Path First (OSPF) fails across a multilink bundle.
Conditions This symptom is observed when a Cisco 7500 series router is placed back-to-back with
any other peer router in a distributed Multilink PPP (dMLP) configuration that has links in a
multilink bundle. When any of the links are removed from the bundle on the side of the peer router,
the OSPF connectivity is lost for few seconds on the Cisco 7500 series router side and then recovers
immediately.
Workaround There is no workaround.
•
CSCdx47884
Symptoms When SONET level alarms occur, such as Loss of Signal (LOS), the SONET line active
alarms field and the alarm indication signal (AIS) monitoring counter may indicate that no alarms
are present when you are viewing the output from the show controllers sonet slot port line-number
privileged EXEC command.
Conditions This symptom is observed when the line summary in the output of the show controllers
sonet slot port line-number privileged EXEC command for a SONET controller on a Cisco 10000
series line card neither properly displays nor counts the AIS when a line alarm condition is present.
Workaround Use the section and path information in the output of the show controllers sonet slot
port line-number privileged EXEC command to interpret whether a line alarm condition is present
or not.
•
CSCdx47936
Symptoms If you configure modular quality of service (QoS) using the command-line interface
(CLI) on a 4-port OC-48 Dynamic Packet Transport (DPT) line card, a Cisco 12000 series Internet
router fails.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(21)ST1.
Workaround Configure QoS using the traditional method.
•
CSCdx59056
Symptoms Label Distribution Protocol (LDP) and Border Gateway Protocol (BGP) with
IPv4+labels could be applied to the same Virtual Private Network (VPN) routing/forwarding
instance (VRF) on the same router, which is restricted in the current code. Hence, the feature cannot
work properly.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)3S1.
Workaround There is no workaround.
•
CSCdx61632
Symptoms If there is a sequence mismatch between peer routers that have an interconnected
multilink interface, the recovery sequence for the router that is out of synchronization may take an
extended period of time and may affect the traffic that is on the router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2014
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
Conditions This symptom is observed on a Cisco 7500 series router that is running Multilink PPP
(MLP).
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected multilink interface.
•
CSCdx62768
Symptoms Traffic fails after a Performance Routing Engine (PRE) cutover on the provider edge (PE)
router.
Conditions This symptom is observed on a Cisco 10000 series edge services router.
Workaround There is no workaround.
•
CSCdx65248
Symptoms Cisco Express Forwarding (CEF) may be disabled on an ATM OC-3 line card after a
memory leak occurs.
Conditions This symptom is observed on an ATM OC-3 line card.
Workaround There is no workaround.
•
CSCdx66281
Symptoms A Cisco router that is running Cisco Express Forwarding (CEF) for IP version 6 (IPv6)
may reload when you enter the show ipv6 cef internal EXEC command.
Conditions This symptom is observed when the IPv6 CEF forwarding table is changed while you
enter the show ipv6 cef internal EXEC command.
Workaround There is no workaround.
•
CSCdx67602
Symptoms An indefinite output pause may occur on a serial interface that is a member of a multilink
group, and the following logs may be seen:
%RSP-3-RESTART: interface Serial3/0/0, not transmitting Serial3/0/0: microcode reload
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.2(10) with a PA-4T-V35 port adapter inserted in the Versatile Interface Processor
(VIP)2-50 or in the VIP2-40 and where one physical interface is a member of a multilink group and
another interface is configured for High-Level Data Link Control (HDLC), and where Cisco Express
Forwarding (CEF) is enabled globally and disabled on the multilink interface (bundle master), and,
lastly, where distributed weighted fair queuing (WFQ) is enabled on the interface configured for
HDLC.
Workaround There is no workaround.
•
CSCdx71843
Symptoms A loopback fails on an Engine 2 line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.3)S2.
Workaround There is no workaround.
•
CSCdx72807
Symptoms You may not be able to attach a service policy to an unspecified bit rate (UBR) ATM
permanent virtual circuit (PVC). You can attach policies to variable bit rate (VBR) and available bit
rate (ABR) PVCs if the bandwidth specified in the policy is lower than peak cell rate (PCR).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2015
Resolved Caveats—Cisco IOS Release 12.0(23)S
Conditions This symptom is observed on a Cisco 7500 series router.
Workaround There is no workaround.
•
CSCdx73104
Symptoms An Engine 4 plus line card may perform Multiprotocol Label Switching (MPLS) Virtual
Private Network (VPN) label disposition incorrectly and punt all packets that have sizes that are
close to the maximum transmission unit (MTU) of the egress VPN interface to the line card CPU.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21.3)S2.
Workaround Increase the MTU of the egress interface.
•
CSCdx73666
Symptoms Some channelized devices may be left down. Via Cisco Discovery Protocol (CDP) you
can see that these devices are connected to different E1 controllers and time slots than those that
were initially configured.
Conditions This symptom is observed on a Cisco 10000 series router that is running Cisco IOS
Release 12.0(21)ST when the redundancy force-failover main-cpu command is used.
Workaround A temporary workaround is to reconfigure the correct controller details.
•
CSCdx73672
Symptoms Traffic may be dropped on a Cisco 12000 series router that is configured with an
Engine 2 (E2) line card.
Conditions This symptom is observed when the following conditions are present:
– Traffic enters the router through the E2 line card.
– The E2 line card performs hardware-accelerated multicast switching because the hw-module
slot number ip multicast hw-accelerate global configuration command is enabled.
– An output access control list (ACL) is configured on the egress interface.
Workaround Remove the hardware-accelerated multicast configuration, and reload the line card.
•
CSCdx73857
Symptoms A router may fail to warn you that a policy map oversubscribes link bandwidth.
Conditions This symptom is observed when you use nested policies on Frame Relay or Gigabit
Ethernet interfaces and the sum of the shape rate of all permanent virtual circuits (PVCs) or VLANs
is greater than the interface bandwidth of the Frame Relay or Gigabit Ethernet interfaces.
Workaround Enter the show policy-map interface EXEC command to ensure that the policy map
is successfully applied.
•
CSCdx73916
Symptoms The Multiprotocol Label Switching (MPLS) forwarding table does not display a label for
an aggregate route.
Conditions This symptom is observed on a Cisco 10720 Internet router and affects only the
aggregate routes that are explicitly configured under the Border Gateway Protocol (BGP)
configuration using the aggregate- address address mask summary- only command.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2016
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx74709
Symptoms The Ring Access Controller (RAC) watchdog timer expires and forces the RAC to enter
the pass-through mode.
Conditions This symptom typically occurs when CPU utilization remains at 100 percent for more
than 90 seconds.
Workaround There is no workaround.
•
CSCdx74864
Symptoms A bus error may occur on a router and the router returns to the ROM monitor (ROMmon)
prompt.
Conditions This symptom is observed on a Cisco 10000 series edge services router when running an
ATM test, atm_mult_card_mult_port_vbr_aggr_segm_and_reas_change_pcr. This error seems to
happen on the unconfiguration part of the test.
Workaround There is no workaround.
•
CSCdx76028
Symptoms Spurious accesses and alignment errors may occur on a Versatile Interface Processor
(VIP), which may cause routes or interfaces to go down.
Conditions These symptoms are observed on a Cisco 7500 series router that has Multiprotocol Label
Switching (MPLS) NetFlow enabled on the egress side through the mpls netflow egress interface
configuration command.
Workaround Configure the ip cef global configuration command or the no ip route-cache
distributed interface configuration command.
•
CSCdx76085
Symptoms A few out of 1000 interfaces are not up after a Trivial File Transfer Protocol (TFTP)
loading configuration has occurred.
Conditions This symptom is observed on a Cisco 10000 series edge services router.
Workaround There is no workaround.
•
CSCdx76645
Symptoms A backup Clock Switch Card 0 (CSC 0) may enter the “going on” state.
Conditions This symptom is observed when an online insertion and removal (OIR) is performed on
a Cisco 12406 router with the primary clock on CSC 1 (slot 17).
Workaround There is no workaround.
•
CSCdx76907
Symptoms A Versatile Interface Processor (VIP4-80) may reload with a bus error when distributed
Multilink PPP (dMLP) is configured.
Conditions This symptom occurs when traffic is passed through the dMLP bundle and occurs just
after the interface comes up. This symptom is specific to the dMLP feature and will occur only if
dMLP is configured on a platform. The dMLP feature is independent of other features and does not
affect other features.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2017
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx79262
Symptoms Line cards may reload while trying to send traffic in a basic Virtual Private Network
(VPN) setup.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S.
Workaround There is no workaround.
•
CSCdx79282
Symptoms NetFlow statistics may not be recorded for some packet flows.
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(20)ST3. If there are many active flows and they stop all at once, the
NetFlow statistics for many of the flows may not be recorded.
Workaround There is no workaround.
•
CSCdx79327
Symptoms Under rare situations Parallel Express Forwarding (PXF) may reload with the following
message:
%PXF-2-FAULT: T0 Local Bus Exception: CPU[t0r1c1] TBACB
Conditions This symptom is observed on a Cisco 10000 series edge services router. The symptom
persists while forwarding to a particular IP address. The address cannot readily be predetermined.
In Cisco IOS Release 12.0(20)ST, Release 12.0(21)ST, and Release 12.0(21)SX on Performance
Routing Engine (PRE)-1, no reload occurs, but traffic for the affected IP address is not forwarded.
Workaround There is no workaround.
•
CSCdx80546
Symptoms A standby Route Processor (RP) may reload when a primary configuration is changed.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx80891
Symptoms If policing is enabled using the modular quality of service QoS command-line interface
CLI (MQC), it may not work with Class-Based Weighted Fair Queueing (CBWFQ) on a Frame
Relay subinterface, although it may work properly with Low Latency Queueing (LLQ).
Conditions This symptom is observed on a Cisco 7500 series router when packets are Cisco Express
Forwarding (CEF) switched instead of distributed Cisco Express Forwarding (dCEF) switched.
Also, if output policing is enabled on the router, output policing and output queueing may not work.
Workaround Disable output policing, or make sure that packets are dCEF switched instead of
non-dCEF switched.
•
CSCdx80911
Symptoms An Ethernet over Multiprotocol Label Switching Ether Frame with a destination MAC
address that starts from 0x4 may high drop on the egress provider edge (PE) router.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2018
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx80940
Symptoms The Tag Forwarding Information Base (TFIB) is not enabled on a router.
Conditions This symptom is observed on a Cisco 12000 series router if the tag-switching ip
interface configuration command is not configured on any interface on a Carrier Supporting Carrier
customer edge (CSC- CE) router or if the tag tdp discovery direct-hello accept global
configuration command is not configured on a CSC-CE, and if there is only IP version 4 (IPv4)
Border Gateway Protocol (BGP) label distribution between the Carrier Supporting Carrier provider
edge (CSC-PE) router and the CSC-CE router.
Workaround Configure the tag-switching ip interface configuration command on an interface on the
router.
•
CSCdx81556
Symptoms Virtual Private Network (VPN) routing/forwarding (VRF) VLAN packet switch ASIC
(PSA) registry memory does not reinitialize when another PSA loads and then unloads because
higher-priority PSA features are being configured and then unconfigured. This situation prevents
VRF VLAN forwarding to function.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx81839
Symptoms Routes from a remote customer edge (CE) router may not appear on another CE router.
Or, routes from a remote CE router may appear on another CE router, but the addresses from the
remote CE router cannot be pinged. Virtual Private Network (VPN) routes between the CEs may be
lost.
Conditions These symptoms are observed when the MPLS VPN Inter-AS—IPv4 BGP Label
Distribution feature is enabled on two Multiprotocol Label Switching (MPLS) VPN autonomous
systems that are separated by a non-MPLS VPN autonomous system, and when the interfaces on the
autonomous system border routers (ASBRs) between the MPLS VPN autonomous systems and the
non-MPLS VPN autonomous system are interfaces of 3-port Gigabit Ethernet line cards. The ASBR
routers are Cisco 12406 routers that are running the gsr-p-mz image of Cisco IOS
Release 12.0(22.1)S1.
In the above-mentioned topology, if you enter the clear ip route * EXEC command on any of the
ASBRs or CE routers, VPN routes between the CEs may be lost.
Workaround Do not enter the clear ip route * EXEC command on any of the ASBRs or CE routers.
If you need to enter the clear ip route * EXEC command, reload the ASBR router on each side of
the Gigabit Ethernet link (that is, the ASBR at the side of the MPLS VPN autonomous system and
the ASBR at the side of the non-MPLS VPN autonomous system).
Note
•
Reloading a router may have a severe impact upon a network and its users, depending upon
the topology and the time of day.
CSCdx82050
Symptoms The Virtual Private Network (VPN) routing/forwarding (VRF) selection driver may not
initialize the VRF selection registers when the VRF selection bundle is loaded.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround Reload microcode onto the line card.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2019
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx82381
Symptoms Traceback may occur under certain instances when Border Gateway Protocol (BGP)
invokes the Tag Forwarding Information Base (TFIB) module of a provider edge (PE) router that is
running IPv6 in a Multiprotocol Label Switching (MPLS) environment (also referred to as a 6PE
router) to add a router when nexthop is not set.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx82969
Symptoms Adding multicast group entries via the ip igmp join-group group-address interface
configuration command to a Cisco 10000 series Gigabit Ethernet Half-Height line card causes the
line card to reset and eventually the router to reload.
Conditions This symptom is observed when about 50 multicast group entries are added via the ip
igmp join-group group-address interface configuration command.
Workaround Add fewer multicast group entries, and add them gradually.
•
CSCdx83597
Symptoms Label Distribution Protocol (LDP) may not come up. The show mpls ldp discovery
command displays the following output message:
TDP running; needs TDP identifier ..
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(21.4)S only if the router is capable of using Stateful Switchover (SSO) after a
switchover.
Workaround Reload the active Route Processor (RP).
•
CSCdx83707
Symptoms Parallel Express Forwarding (PXF) may reload and restart.
Conditions This symptom is observed on a Cisco 10000 series edge services router when deleting
an attached policy map.
Workaround Remove the policy from all interfaces before deleting the policy from the
configuration.
•
CSCdx84445
Symptoms A line card may be stuck in the off-for-download state.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S2. This symptom may be indicated in the output of the show cef linecard EXEC
command.
Workaround There is no workaround.
•
CSCdx84984
Symptoms On a router that is configured with two Route Processors (RPs) and that has the Route
Processor Redundancy Plus (RPR+) feature enabled, if the standby RP is reloaded before it is fully
initialized, the global configuration on the active RP gets locked.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21.4)S. The symptom occurs only if the standby RP is reloaded by an operator
command while a bulk synchronization is performed on the running configuration.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2020
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx86498
Symptoms A ping fails over a Multiprotocol Label Switching Traffic Engineering (MPLS-TE)
tunnel.
Conditions This symptom is observed on a Cisco 12000 series Internet router when the uplink
interface is a Gigabit Ethernet line card.
Workaround There is no workaround.
•
CSCdx86570
Symptoms Spurious accesses occur on a per-packet basis on a Versatile Interface Processor (VIP).
In addition, interfaces and routing protocols on the affected VIP and other interfaces on the router
may flap.
Conditions This symptom is observed on a Cisco 7500 series router when Multiprotocol Label
Switching (MPLS) is enabled on one of the VIP interfaces.
Workaround There is no workaround.
•
CSCdx86907
This caveat describes two symptoms, two conditions, and two workarounds:
Symptoms A An access control list (ACL) does not operate correctly to match Layer 4 Operation
(L4Op) entries. The ACL clears the logical operator unit (LOU) while it is still being used by other
interfaces.
Conditions A This symptom is observed when an ACL is removed from one interface after the ACL
is applied to multiple interfaces.
Workaround A Remove the ACL from all interfaces to which the ACL has been applied and reapply
the ACL to the interfaces as needed.
Symptoms B A ternary content addressable memory (TCAM) LOU capacity error may occur even
though the number of used LOUs in the existing ACLs is less than the set limit.
Conditions B This symptom is observed when two different ACLs are applied to two different
interfaces (ACL A on interface A and ACL B on interface B). When ACL A is applied to interface
B, the LOU from ACL B is not cleared. This behavior causes LOUs to be wasted in TCAM.
Workaround B First remove ACL B from the interface, and then reapply ACL A to that interface.
•
CSCdx87271
Symptoms A standby Route Processor (RP) may reload after a Route Processor Redundancy Plus
(RPR+) switchover.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S.
Workaround There is no workaround.
•
CSCdx87293
Symptoms When Field Diagnostics are executed on a line card, Framer Loopback tests may fail if
fiber is connected to the line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S.
Workaround Do not run Field Diagnostics on line cards that have fiber connected to them.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2021
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx87951
Symptoms When you configure a Packet-over-SONET interface, a call control block (CCB)
playback error occurs, and a standby Route Processor (RP) reloads. The following error messages
are generated:
%HA-3-SYNC_ERROR: CCB Playback error.
%HA-5-SYNC_RETRY: Reloading standby and retrying sync operation (retry 1).
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0 S after a Stateful Switchover (SSO) has occurred.
Workaround There is no workaround.
•
CSCdx87998
Symptoms Fast Reroute (FRR) does not fully deconfigure.
Conditions This symptom is observed when the mpls traffic-eng signaling forwarding sync
command is enabled.
Workaround Do not use FRR when the mpls traffic-eng signaling forwarding sync command is
enabled.
•
CSCdx88897
Symptoms Label distribution protocol (LDP) cannot create a Tag Information Base (TIB) entry for
0.0.0.0, which prevents LDP from performing label switching on a packet that is routed using the
default route.
Conditions This symptom is observed in Cisco IOS Release 12.0(21.4)S, Release 12.0(21.4)SY,
Release 12.2(11.3), Release 12.2(11.3)S, and Release 12.2(11.3)T.
Workaround There is no workaround.
•
CSCdx90522
Symptoms Multicast packets are not reaching the IP/Open Shortest Path First (OSPF) layer in a
router.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx90908
Symptoms The value of the ciscoEnvMonTemperatureThreshold variable is incorrectly reported as
7 degrees or 65,535 degrees. This condition causes the Device Fault Manager (DFM) to send
high-temperature alarms for sensors that indicate that the value of the
ciscoEnvMonTemperatureThreshold variable is equal to 7 degrees.
Conditions These symptoms are observed on a Cisco 12016 router.
Workaround There is no workaround.
•
CSCdx91397
Symptoms The Multilink PPP (MLPPP) sequence number may not be updating correctly, and traffic
is sent to the Route Processor (RP).
Conditions This symptom is observed after a Performance Routing Engine (PRE) switchover on a
Cisco 10000 series router that is running Cisco IOS Release 12.0(21.4)S and that is connected to a
Cisco 7500 series router via a channelized T3 interface.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the multilink interfaces after the cutover.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2022
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdx91482
Symptoms A master Route Switch Processor 8 (RSP8) may reload after an online insertion and
removal (OIR) of a line card.
Conditions This symptom is observed on a Cisco 7500 series router that is configured with dual
RSP8s.
Avoiding an OIR following the bootup of the slave RSP8 reduces the chance that the master RSP8
will reload. The symptoms have not been observed on other RSPs (that is, other than the RSP8s).
Workaround There is no workaround.
•
CSCdx92027
Symptoms A Route Switch Processor 8 (RSP8) pauses indefinitely.
Conditions This symptom is observed when you enter the ip cef global configuration command on
a Cisco 7500 series router that is running Cisco IOS 12.1(12c)E.
Workaround There is no workaround.
•
CSCdx92475
Symptoms A Cisco IOS Versatile Interface Processor Software (SVIP) for a Cisco 7500 series router
may fail to compile because of new function calls that are not included in its crypto-related
subsystem.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx92768
Symptoms When a permanent virtual connection (PVC) that is configured on a Cisco 12000 series
Engine 2 8-port OC-3 ATM line card is changed from a virtual circuit (VC) bundle to regular VC
mode, the PVC stops forwarding traffic. In addition, the MacString appears to be broken and an error
message indicates that there are spurious memory accesses.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx93548
Symptoms You may not be able to change the mode of a 24-port channelized E1/T1 line card from
E1 to T1, from T1 to E1, or—as a test—from its present mode to its present mode.
In the examples below, line card 2/0 is already configured in the T1 mode:
Router(config)# card 2/0 24che1t1-1 mode e1
Card provisioning conflict
Router(config)# card 2/0 24che1t1-1 mode t1
Card provisioning conflict
Conditions This symptom is observed on a Cisco 10000 series router that is running the
c10k-p10-mz image of Cisco IOS Release 12.0 S.
Workaround There is no workaround.
•
CSCdx93629
Symptoms The following error messages may be displayed on a router:
SLOT 8:00:27:52: %EE48-5-TM_PROC: TCAM Delete Table not free(40), Alpha:RX Lbl:4099
Appl:2 fail: 40
-Traceback= 403503E0 403504FC 40356E34 4035779C 403579B0 400B3DFC400B3DE8
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2023
Resolved Caveats—Cisco IOS Release 12.0(23)S
SLOT 8:00:28:00: %EE48-5-TM_PROC: TCAM Delete Invalid Parameters(35), Alpha:RX
Lbl:4099 Appl:2 fail: 35
-Traceback= 403503E0 403504FC 40356E34 4035779C 403579B0 400B3DFC400B3DE8
The access control list (ACL) stops functioning properly after this symptom occurs.
Conditions This symptom is observed if the same ACL is applied to multiple interfaces on an IP
Service Engine (ISE) that is installed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx94144
Symptoms A Versatile Interface Processor (VIP) reloads after a Stateful Switchover (SSO) has
occurred.
Conditions This symptom is observed on a Cisco 7500 series router.
Workaround There is no workaround.
•
CSCdx94390
Symptoms The following error message appears on a Cisco 12000 series Internet router when you
enable a turbo access control list (Turbo ACL):
%SYS-2-MALLOCFAIL: Memory allocation of 10980020 bytes failed from 0x400BE22C,
alignment 32
Pool: Processor Free: 25912464 Cause: Memory fragmentation
Alternate Pool: None Free: 0 Cause: No Alternate pool
-Process= "TurboACL", ipl= 0, pid= 41
-Traceback= 400BB150 400BD4E4 400BE234 40BCDBE4 40BCDA70 40BCDAB8 40BCDAB8 40BCD97C
40BCFD00 40BD1650 400B3DFC 400B3DE8
Conditions This symptom is observed on a a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S2 and that is configured with an 8-port Fast Ethernet 100-Base-TX
interface with 128 MB of route memory.
Workaround Turn off compiled access lists using the no access-list compiled global configuration
command.
•
CSCdx94409
Symptoms Fast Reroute (FRR) tunnels that are created bidirectionally for each of two parallel links
(that is, a total of four backup tunnels) fail to remain up when one or both of the links go down.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx94588
Symptoms A CyBus 10 error and a QAERROR occur after a Stateful Switchover (SSO) has
occurred.
Conditions This symptom is observed on a Cisco 7500 series router when the standby Route Switch
Processor (RSP) is being reloaded.
Workaround There is no workaround.
•
CSCdx94633
Symptoms A router may reload under a heavy packet load.
Conditions This symptom is observed when large IP version 6 (IPv6) packets (of 18,008 bytes) are
sent to an IPv6 nonbroadcast multiaccess (NBMA) tunnel source address.
The symptoms are caused by the use of a packet flag after the packet has been returned to the system.
This is incorrect, but only causes a router with a heavy packet load to reload.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2024
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
Workaround Set the maximum transmission units (MTUs) correctly, both on the IPv6 tunnel
interface and on the IP version 4 (IPv4) interfaces, to ensure that fragmentation of IPv6 packets
occurs only at the IPv6 layer and not at the IPv4 layer.
•
CSCdx94730
Symptoms An IronBus error occurs on a Cisco 10000 series 1-port channelized OC-12 line card.
The console log shows the following information:
%C10KEVENTMGR-1-IRONBUS_FAULT: Ironbus Event 2/1, Restarting Ironbus
%IPCGRP-3-SYSCALL: System call for command 203 (slot2/0): ipc_send_rpc_blocked failed
(Cause: timeout)
-Traceback= 603C4208 603C4698 603C53E8 6013BFC0 60089C64 600248D4 60024C4C 6035270C
603526F8%IPCOIR-3-TIMEOUT: Timeout waiting for a response from slot 2/0.
%IPCOIR-2-CARD_UP_DOWN: Card in slot 2/0 is down. Notifying 1choc12-1 driver.
%C10K_ALARM-6-INFO: ASSERT CRITICAL slot 2 Card Stopped Responding OIR Alarm
%IPCOIR-5-CARD_DETECTED: Card type 1choc12-1 (0x1BB) in slot 2/0
%IPCOIR-5-CARD_LOADING: Loading card in slot 2/0
%C10K-5-LC_NOTICE: Slot[2/0] 1choc12-1 Image Downloaded...Booting...
%PXF_DMA-3-IRONBUS_NOTRUNNING: Data path to slot 2/1 failed to synchronize (TIB Not
Running)
Conditions This symptom is observed on a Cisco 10000 series edge services router when you copy
a configuration for creating 768 DS0 interfaces under a Virtual Tributary (VT) on the 1-port
channelized OC-12 line card onto the running configuration.
Workaround Limit the number of DS0 interfaces to 575 or fewer.
•
CSCdx96063
Symptoms Missing Tag Forwarding Information Base (TFIB) entries may be observed after the
clear ip route * privileged EXEC command is entered.
Conditions This symptom is observed in a cell-based Multiprotocol Label Switching (MPLS)
network while the multiple virtual circuit (VC) feature is enabled.
Workaround Use the clear ip route prefix privileged EXEC command instead of the clear ip route
* privileged EXEC command.
•
CSCdx96315
Symptoms A line card reloads when you remove a static route from a Cisco 12000 series Internet
router.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdx96410
Symptoms Traffic that is travelling into the core from a autonomous system border router (ASBR)
is dropped from an inter-autonomous system setup because some packets that are travelling out of
the ASBR are corrupted in the hardware of a Cisco 12000 series Engine 2 line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdy01077
Symptoms The following error messages may be displayed on the console port of a
Cisco Catalyst 6000 switch:
%TFIB-7-SCANSABORTED: TFIB scan not completing. MAC string updated.
%TFIB-DFC8-7-SCANSABORTED: TFIB scan not completing. MAC string updated. *
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2025
Resolved Caveats—Cisco IOS Release 12.0(23)S
The messages may continue to be displayed until the Cisco Catalyst 6000 switch is reloaded. The
error messages are informational and indicate that an excessive amount of network or line transitions
may cause an excessive number of Forwarding Information Base (FIB) scans. Processes that are
attempting to converge on the network may cause the Route Processor (RP) and the Switch
Processor (SP) CPU utilization to occasionally reach 100 percent.
Conditions This symptom is observed on a Cisco Catalyst 6000 switch that is running Cisco IOS
Release 12.2.
Workaround There is no workaround.
•
CSCdy01678
Symptoms Traffic is forwarded to the correct egress interface, but no labels are imposed on the
traffic.
Conditions This symptom is observed in a Multiprotocol Label Switching Virtual Private Network
(MPLS VPN) inter-autonomous system when an Engine 4 plus line card receives traffic on a VPN
routing/forwarding (VRF) interface on an autonomous system border router (ASBR).
Workaround There is no workaround.
•
CSCdy02248
Symptoms A standby Route Processor (RP) may reload.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(22.1)S when a microcode reload occurs after Border Gateway Protocol
(BGP) peers come up accompanied by high CPU utilization.
Workaround There is no workaround.
•
CSCdy02479
Symptoms Some Hot Standby Router Protocol (HSRP) hello packets may drop. The output of the
debug standby command and the debug ip packet detail command shows if packets drop.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with an
8-port Fast Ethernet line card when HSRP is enabled.
Workaround Enter the debug line card no-throttle EXEC command from the line card console, and
verify that the HSRP packets no longer drop.
•
CSCdy03533
Symptoms A Cisco 10720 router cannot forward full line-rate OC-48 Spatial Reuse Protocol (SRP)
transit traffic on an inner ring, an outer ring, or on both rings if the SRP frame size (including the
cyclic redundancy check [CRC]) is between 52 and 102 bytes. The transit performance can be as
low as 1.6 Gbps in one direction. Any frame size that is larger than 102 bytes can be forwarded at
full line rate.
Conditions This symptom is observed on high-rate small-transit SRP frames on a Cisco 10720
router that is running Cisco IOS Release 12.0(19)SP, Release 12.0(20)SP, or Release 12.0(21)SP.
Workaround There is no workaround.
•
CSCdy04039
Symptoms A 3-port Gigabit Ethernet card may reload following the configuration of Border
Gateway Protocol (BGP) Policy Accounting on either the main interface or a subinterface.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21.4)S2.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2026
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy04062
Symptoms A tunnel that is configured for IP version 6 (IPv6) does not pass traffic.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.1)S.
Workaround There is no workaround.
•
CSCdy04143
Symptoms The rate-limit output bps interface configuration command is not supported if the bps
argument has a value of 80,000 or higher.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy04218
Symptoms You cannot set a maximum transmission unit (MTU) size other than the default size.
Conditions This symptom is observed on a Packet-over-SONET interface that is configured on a
Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy04271
Symptoms When Route Processor Redundancy Plus (RPR+) is enabled and you perform a
microcode reload on an active Route Processor (RP) but the router is not configured with a standby
RP, the configuration mode pauses indefinitely.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.01)S.
Workaround There is no workaround.
•
CSCdy05218
Symptoms On all components of a standby Route Processor (RP), dir, show, copy, and write
commands may fail.
Conditions This symptom is observed on a Cisco 12000 series router when the active RP is running
a release earlier than Cisco IOS Release 12.0(21.1)S1 and the standby RP is running Cisco IOS
Release 12.0(21.1)S1 or a later release.
Workaround There is no workaround.
•
CSCdy09292
Symptoms Physical inverse multiplexing over ATM (IMA) ports are not indexed in the IF-MIB.
Conditions This symptom is observed on a Cisco router that has IMA interfaces. This symptom is
resolved in Cisco IOS Release 12.2(3)T but may occur in Cisco IOS Release 12.2(8)T and
Release 12.2(10.3)T2.
The following example of the IF-MIB shows ATM1/IMA0 (index 43), but the interface is not
indexed:
ifDescr.40
ifDescr.41
ifDescr.42
ifDescr.43
ifDescr.44
ifDescr.45
ifDescr.46
=
=
=
=
=
=
=
ATM1/7-aal5 layer
ATM1/7.0-aal5 layer
Null0
ATM1/ima0 <---ATM1/ima0-atm layer
ATM1/ima0.0-atm subif
ATM1/ima0-aal5 layer
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2027
Resolved Caveats—Cisco IOS Release 12.0(23)S
ifDescr.47 = ATM1/ima0.0-aal5 layer
ifDescr.48 = ATM1/ima0.40-atm subif
ifDescr.49 = ATM1/ima0.40-aal5 layer
Workaround There is no workaround.
•
CSCdy09632
Symptoms An access control list (ACL) may fail when there are more than 128 ACLs configured.
Conditions This symptom is observed on any Engine 2 line card that is installed in a Cisco 12000
series router that is running Cisco IOS Release 12.0(22.1)S.
Workaround There is no workaround.
•
CSCdy09979
Symptoms A Route Processor (RP) may reload when traffic engineering (TE) tunnels are
configured.
Conditions This symptom is observed on an RP that is running the gsr-p-mz image of Cisco IOS
Release 12.0(22.1)S. The reload typically occurs after one or more tunnels are removed by entering
the no interface interface-type interface-number global configuration command.
Workaround Do not remove the tunnel interfaces.
•
CSCdy10293
Symptoms A Versatile Interface Processor (VIP) on a Cisco 7500 series router may run out of
memory and generate the following memory allocation (MALLOC) failure messages:
%SYS-2-MALLOCFAIL: Memory allocation of 65556 bytes failed from 0x6010EB8C, alignment
32 Pool: Processor Free: 173756 Cause: Memory fragmentation Alternate Pool: None Free:
0 Cause: No Alternate pool
-Process= "CEF IPC Background", ipl= 0, pid= 31
The show process memory section in the output of the show tech EXEC command indicates that the
Multiprotocol Label Switching (MPLS) Cisco Express Forwarding (CEF) interprocess
communication (IPC) background process is holding up a large portion of the memory.
Conditions This symptom is observed on the VIP of a Cisco 7500 series router.
Workaround There is no workaround.
•
CSCdy11148
Symptoms An active Route Processor (RP) is not able to access any of components of the standby
RP, and the router cannot enable the Stateful Switchover (SSO) feature.
Conditions These symptoms are observed when the active RP is running Cisco IOS
Release 12.0(22)S on a Cisco 7500 series, Cisco 10000 series, or Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy12694
Symptoms The line protocol of several channels that are configured on several 24-port channelized
E1/T1 line cards does not come up.
Conditions This symptom is observed during scaling tests and occurs at a pseudorandom pattern
when seven 24-port channelized E1/T1 line cards are installed in a Cisco 10000 series router and
168 ports are configured as 24 time-slot channels with PPP encapsulation. In this configuration, the
line protocol of 8 out of 168 channels does not come up.
Workaround To recover from the situation, enter the hw-module slot reload EXEC command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2028
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy13460
Symptoms Multiprotocol Label Switching (MPLS) packets that come in on a dense OC-48 Spatial
Reuse Protocol (SRP) ring are not correctly handled and switched to the next hop. IP traffic works
fine.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdy13504
Symptoms Basic Frame Relay connectivity does not function on a Cisco 7200 series router.
Conditions This symptom is observed on a Cisco 7200 series router that is running the c7200-p-mz
image of Cisco IOS Release 12.0(22)S or Release 12.0(22.1)S1.
Workaround There is no workaround.
•
CSCdy14361
Symptoms When a Cisco 10720 router is forwarding Multiprotocol Label Switching (MPLS)
packets at a very high rate, the Parallel Express Forwarding (PXF) data plane may reload.
Conditions This symptom is observed when the Cisco 10720 router is forwarding MPLS traffic near
the system limitation of 2 million packets per second and a routing change occurs that causes traffic
to be forwarded to the Packet-over-SONET (POS)/Spatial Reuse Protocol (SRP) uplink interface
instead of to an interface on the Fast Ethernet (FE) or Gigabit Ethernet (GE) line card, or the other
way around, that is, to the interface on the FE or GE line card instead of to the POS/SRP uplink
interface.
Workaround There is no workaround.
•
CSCdy15610
Symptoms IP traffic that leaves a Virtual Private Network routing/forwarding (VRF) interface that
has dot1q encapsulation enabled may not have Address Resolution Protocol (ARP) entries and may
fail.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(22.01)S1.
Workaround There is no workaround.
•
CSCdy15917
Symptoms Policy-based routing commands on subinterfaces of an IP Service Engine (ISE) line card
may not take effect properly.
Conditions This symptom is observed on a Cisco 12000 series router when multiple Frame Relay
subinterfaces are configured on an ISE line card.
Workaround There is no workaround.
•
CSCdy17735
Symptoms A single headend rewrite that is used by all prefixes that are routed over a tunnel is not
updated properly when the label switched path tunnel state changes and there are no prefixes being
routed over the tunnel.
In addition, the output of the show mpls traffic-eng fast-reroute database command inaccurately
represents the entries that are contained within the Fast Reroute (FRR) database. Prefix information
is not applicable to the headend tunnel rewrite and should be displayed separately.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2029
Resolved Caveats—Cisco IOS Release 12.0(23)S
The output of the show mpls traffic-eng fast-reroute database command does not display any
tunnel data, but, as long as the headend tunnel is up, there should always be one entry for the
headend tunnel.
Conditions These symptoms are observed when FRR protection is enabled on a tunnel, when there
are no prefixes being routed over this tunnel, and when Label Distribution Protocol (LDP) is not
enabled.
Workaround There is no workaround.
•
CSCdy18236
Symptoms A Cisco 12000 series Engine 4 plus line card reloads during the bootup process.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdy18641
Symptoms A router may reload unexpectedly when a Layer 2 Tunneling Protocol (L2TP) connection
is established.
Conditions This symptom is observed on a Cisco 7401ASR router that is used as a Layer 2
Tunneling Protocol (L2TP) network server (LNS).
Workaround There is no workaround.
•
CSCdy19913
Symptoms A virtual circuit (VC) bundle fails on an Virtual Private Network routing/forwarding
(VRF) interface of an Engine 2 8-port OC-3 STM-1 ATM line card.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected interface.
•
CSCdy20257
Symptoms When customer edge (CE) routers are connected over a Layer 2 Tunneling Protocol
version 3 (L2TPv3) tunnel, pings may not go through.
Conditions This symptom is observed when the CE routers are connected to provider edge (PE)
routers via Gigabit Ethernet links that have 802.1 encapsulation enabled. If the links are changed to
Fast Ethernet, the symptom does not occur.
Workaround There is no workaround.
•
CSCdy20461
Symptoms After a standby Route Processor (RP) has fully initialized and you perform a microcode
reload followed by a Route Processor Redundancy Plus (RPR+) switchover, both the active RP and
the standby RP pause indefinitely when the line cards are coming back up.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.1)S1 in a configuration with 2000 ATM subinterfaces and 200 Border Gateway
Protocol (BGP) peers that are advertising 180,000 BGP routes.
Workaround There is no workaround. To recover from the situation, send a break.
•
CSCdy21549
Symptoms When PPP encapsulation is enabled on Section Data Communications Channel (SDCC)
interfaces on an OC-48 line card, connectivity is lost.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2030
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
Conditions This symptom is observed on a Cisco 10000 series router.
Workaround Use only High-Level Data Link Control (HDLC) encapsulation.
•
CSCdy22453
Symptoms When Multiprotocol Label Switching traffic engineering (MPLS TE) reoptimizes to a
PPP link that just came up, traffic may be dropped for up to 1 minute.
Conditions This symptom is observed when Label Distribution Protocol (LDP) is enabled.
Workaround Use High-Level Data Link Control (HDLC).
Alternate Workaround Disable LDP.
•
CSCdy22521
Symptoms An Engine 4 (E4) Packet-over-SONET (POS) line card that is functioning as an ingress
IP version 6 (IPv6) interface for traffic that is routed over IPv6 tunnels may reload.
Conditions This symptom is observed on a Cisco 12000 series router when traffic is flowing through
the E4 POS line card.
Workaround There is no workaround.
•
CSCdy22744
Symptoms The fix for CSCdx47695 that was integrated into Cisco IOS Release 12.0(21)S3
introduced a throttling mechanism that may be used when the physical layer interface module
(PLIM) is congested. The throttling mechanism prevents interfaces or a bundle, or both, from
flapping when bidirectional traffic with small packets is sent through either a 6-port channelized T3
line card or a 2-port channelized OC-3/STM-1 (DS1/E1) line card.
The throttling mechanism produces a severe performance impact, although no link flaps occur.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround. The fix for this caveat consists of a knob for the throttling.
•
CSCdy23912
Symptoms A Cisco 7200 series router reloads when you enter the show access-list compiled EXEC
command.
Conditions This symptom is observed on Cisco 7200 series router that is configured with a Network
Processing Engine G1 (NPE-G1) when there is an empty IP version 4 (IP4) or IP version 6 (IPv6)
access control list (ACL).
Workaround Ensure that the IPv4 or IPv6 ACL is not empty when you enter the show access-list
compiled EXEC command.
•
CSCdy24263
Symptoms If you perform an online insertion and removal (OIR) of a 4-port Packet-over-SONET
OC-3c/STM-1 line card before a standby Route Processor (RP) is fully initialized, the line card
disappears from the Cisco IOS configuration after the standby RP is fully initialized.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.2)S and that has the Route Processor Redundancy Plus (RPR+) feature enabled,
2000 ATM subinterfaces configured, and 200 Border Gateway Protocol (BGP) peers configured that
are advertising 180,000 BGP routes.
Workaround Boot both the active RP and the standby RP at the same time.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2031
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy25563
Symptoms When a Cisco 12000 series router is booted up or when a 10-port 1-Gigabit Ethernet line
cards is reloaded, a CPUHOG message may occur in the Cisco Express Forwarding (CEF) line card
interprocess communication (IPC) background process, as is displayed in the following error
message:
%SYS-3-CPUHOG: Task ran for 3120 msec (0/0), process = CEF LC IPC Background, PC =
40CEC7E0.
-Traceback= 40CEC7E8 40CDCDC0 40CF2498 40CEF65C 40CEF90C 40CEFBDC 40CF0604 40 0B9BCC
400B9BB8
Conditions This symptom is observed on a Cisco 12416 router that is running Cisco IOS
Release 12.0(22.1)S1 and that is configured with a Performance Route Processor (PRP), two 10-port
1-Gigabit Ethernet line cards, two 8/16-port OC-3 Packet-over-SONET (POS) line cards, each of
which is configured with an even distribution of about 2000 Frame Relay permanent virtual circuit
(PVC) subinterfaces, and 700 Border Gateway Protocol (BGP) peers.
Workaround There is no workaround.
•
CSCdy25753
Symptoms The Any Transport over Multiprotocol Label Switching (AToM) feature does not
generate syslog messages that indicate if or when labels are being imposed or withdrawn on remote
provider edge (PE) routers.
Conditions This symptom is observed when AToM virtual circuit (VC) labels are imposed or
withdrawn.
Workaround If available in the software image that you are running, enable the debug logging
commands.
•
CSCdy26487
Symptoms An E1 interface may report that it is handling more than its maximum bandwidth of
1984 kbps.
Conditions This symptom is observed on an E1 channel group that is configured with 31 time slots.
Workaround There is no workaround.
•
CSCdy26606
Symptoms A Versatile Interface Processor (VIP) that has a High-Speed Serial Interface (HSSI)
reloads continuously after the router is reloaded.
Conditions This symptom is observed when the HSSI interface is in the shutdown state and when it
is configured for Frame Relay encapsulation while a quality of service (QoS) with priority feature
is enabled.
Workaround Enter the no shutdown interface configuration command on the interface or remove
the QoS policy before reloading the router.
mechanism, for which the default position is “Off.”
•
CSCdy27294
Symptoms On a Cisco 12000 series router that is functioning as a provider edge (PE) router and that
is configured with Engine 2 line cards in a Multiprotocol Label Switching Virtual Private Network
(MPLS VPN) environment, route aggregation in Border Gateway Protocol (BGP) breaks
connectivity because the more specific routes are not in the BGP VPN routing/forwarding (VRF)
table.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2032
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
Conditions This symptom is observed when there are multiple customer edge (CE) routers attached
to a 3-port Gigabit Ethernet line card, when route aggregation is used in the BGP IP version 4 (IPv4)
VRF address family, and when more specific routes are suppressed.
Workaround Ensure that the more specific routes are imported into the BGP VRF table by either
redistribution or network statements.
•
CSCdy28243
Symptoms After a Cisco 12000 series router performs a switchover, a Cisco Express Forwarding
(CEF) CPUHOG message occurs and the router reloads.
Conditions This symptom is observed when the Cisco 12000 series router is configured for IP
routing and has IP CEF enabled and when the Address Resolution Protocol (ARP) table is filled with
50,000 entries.
Workaround There is no workaround.
•
CSCdy28534
Symptoms Attempting to perform a Fast Software Upgrade (FSU) causes a standby Route Switch
Processor (RSP) to enter a continuous reboot cycle.
Conditions This symptom is observed on a Cisco 7500 series router when you attempt to perform an
FSU from Cisco IOS Release 12.0(22)S to Release 12.0(22.2)S or later releases.
Workaround Perform a full software upgrade instead of an FSU.
•
CSCdy29545
Symptoms Packets that are traversing an Engine 4 plus (E4+) OC-192 line card in a Cisco 12000
series router that has tag switching enabled may be dropped.
Conditions This symptom is observed in a traffic engineering (TE) configuration and occurs when
traffic is load balancing across multiple TE tunnels at the headend or when label imposition is
performed over multiple paths.
Workaround Enter the clear ip route network mask command on the ingress side of the OC-192 link.
Use caution because entering the clear ip route * command may invoke the symptoms.
•
CSCdy29962
Symptoms Traffic that is destined for a line card is forwarded to a Route Processor (RP).
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22.2)S when you apply an access control list (ACL) to a Virtual
Private Network routing/forwarding (VRF) interface of an Engine 2 Packet-over-SONET line card.
Workaround There is no workaround.
•
CSCdy29983
Symptoms Border Gateway Protocol (BGP) policy accounting counters on a 3-port Gigabit Ethernet
line card increment incorrectly.
The output of the show cef interface type number statistics EXEC command displays that the
average rate of index 1 through 3 is about 200 to 300 Mbps while the actual traffic is about 400 kbps.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2033
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy30438
Symptoms An Engine 4 line card may reload and may become stuck in the REQ DUMP state.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.2)S when you enter the show controllers forwarding memory manager
command.
Workaround There is no workaround. The show controllers forwarding memory manager
command is a line-card specific command. Although it is not a hidden command, in general, you
should not use it.
•
CSCdy30484
Symptoms An Engine 2 3-port Gigabit Ethernet line card that receives a tag packet with a Time to
Live (TTL) value of 1 may reload.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy30595
Symptoms A Route Processor reloads and returns to the ROM monitor (ROMmon) prompt.
Conditions This symptom is observed on a Cisco 12000 series router when you attach a Cell Loss
Priority (CLP) bit setting hierarchical policy to an interface of an Engine 2 8-port OC-3 ATM line
card.
Workaround There is no workaround.
•
CSCdy30761
Symptoms Extended pings fail to send packets in a mixed IP and Multiprotocol Label Switching
(MPLS) network.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22.2)S.
Workaround There is no workaround.
•
CSCdy30797
Symptoms A line card does not recover from a system interruption such as a router reload or a
microcode reload onto the line card.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with an
Engine 2 line card on which 100 Virtual Private Network (VPN) Frame Relay subinterfaces are
configured.
Workaround There is no workaround. However, in rare cases the line card may recover from an
additional router reload.
•
CSCdy31191
Symptoms Packets that enter a provider edge (PE) router over an Engine 4 plus (E4+) line card may
not be filtered properly.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with an E4+
1-port OC-192 or an E4+ 4-port OC-48 line card, when the packets are forwarded out of a Virtual
Private Network routing/forwarding (VRF) customer-facing interface that has an output access
control list (ACL) configured.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2034
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy31315
Symptoms A Cisco 12000 series router may reload in the ipc_open_port_by_name function.
Conditions This symptom is observed on a Cisco 12416 router that is running Cisco IOS
Release 12.0(22.1)S1 and that is configured with a Performance Route Processor (PRP), two
8/16-port OC-3 Packet-over-SONET (POS) line cards, each of which is configured with 1000
permanent virtual circuit (PVC) subinterfaces, and 700 Border Gateway Protocol (BGP) peers.
Workaround There is no workaround.
•
CSCdy31765
Symptoms The following symptoms may be observed on a Cisco 12000 series Engine 2 (E2) ingress
line card that is installed in a provider edge (PE) router.
When traffic is destined for an IP address for which the Cisco Express Forwarding (CEF) adjacency
is an Ethernet MAC address and the Address Resolution Protocol (ARP) cache is either empty or
incomplete, traffic is punted to the CPU of the line card. The CPU attempts to resolve the adjacency
and drops the traffic.
While the ARP cache for the Ethernet MAC address is incomplete but traffic is being received for
the IP address, the CPU utilization of the line card may increase to 99 percent. This situation may
lead to a loss of Interior Gateway Protocol (IGP) neighbors and fabric-unicast ping timeouts, which
in turn may cause the line card to reload.
When the CEF adjacency moves from an incomplete state to a MAC address, buffer management
application-specific integrated circuit (ASIC) (BMA) errors are triggered and packet switch ASIC
(PSA) pipeline stall messages may be displayed:
%LC-3-BMAERRS: ToFab BMA BMA error status error 10
%QM-3-ERROR: ToFab Register 0x40007.
-Traceback= 403F0074 4036DBF4 40498814 400CCF98
%LC-3-BMAERRS: ToFab BMA QM error 1
Conditions These symptoms are observed in a Multiprotocol Label Switching Virtual Private
Network (MPLS VPN) in which a Cisco 12000 series router that is functioning as a PE router is
connected to a provider (P) router through an E2 line card and the connection between the PE router
and the customer edge (CE) router is a Gigabit Ethernet link.
Workaround The following sequence of commands will prevent the loss of IGP neighbors and
fabric-unicast ping timeouts:
a. Enter the attach slot-number privileged EXEC command for the E2 line card.
b. Enter the enable EXEC command.
c. Enter the configure terminal privileged EXEC command.
d. Enter the controller hw-throttle privileged EXEC (hidden) command.
This sequence of commands will not prevent BMA errors and PSA pipeline stall messages, but will
prevent the IGP neighbors from being lost and the line card from reloading. Note that these
commands will no longer be enabled if the line card or router reloads.
•
CSCdy32226
Symptoms After a forced switchover, the new standby Route Processor (RP) does not come up
properly. The startup configuration fails to synchronize to the new standby RP.
Conditions These symptoms are observed on a Cisco 12000 series router after you have entered the
redundancy force-switchover EXEC command.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2035
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy33106
Symptoms An IP Service Engine (ISE) line card reloads because of a software error.
Conditions This symptom is observed after you have reloaded a Cisco 12000 series router that is
running Cisco IOS Release 12.0(21)S or a later release while traffic was active, and the ISE line card
has Virtual Private Networks (VPNs) configured on Frame Relay subinterfaces. After the router has
reloaded, the line card comes up, reports a software error, and reloads.
Workaround First terminate the traffic before you reload the router. After the router has reloaded,
resume the traffic after the ISE line card has reached the Cisco IOS “Run” state.
•
CSCdy34017
Symptoms An access control list (ACL) with an Internet Control Message Protocol (ICMP) entry
may be incorrectly processed by (the packet switch ASIC [PSA] of) an Engine 2 line card.
Conditions This symptom is observed on a Cisco 12000 series Engine line card when an ACL entry
matches an ICMP packet that is specifying its type but not its code.
Workaround Specify the code in all ICMP entries.
•
CSCdy35263
Symptoms A Cisco 12000 series 4-port ATM line card repeatedly reloads after you have performed
a microcode reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22)S when the carrier supporting carrier feature configured on the
4-port ATM line card.
Workaround There is no workaround.
•
CSCdy36370
Symptoms Label controlled ATM (LC-ATM) bindings may not come up after a Stateful Switchover
(SSO) is performed.
Conditions This symptom is observed on a Cisco 7500 series router that is configured with an
LC-ATM interface.
Workaround There is no workaround.
•
CSCdy37630
Symptoms A customer edge (CE) router cannot send Virtual Private Network (VPN) traffic to other
CE routers that are connected to the same network core.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22.3)S and that is functioning as a CE router that is attached to a
provider edge (PE) router. The PE router is configured with an Engine 4 plus dense OC-48 line card
that is facing the network core.
Workaround There is no workaround.
•
CSCdy38681
Symptoms A 1-port ATM Enhanced OC12/STM4 port adapter (PA-A3-OC12) that is configured
with multiple Low Latency Queueing (LLQ) streams that are running near peak cell rate (PCR) may
drop packets. The output of the show interfaces command displays that packets are sent out but no
packets are coming in. Input or output packet drops are not displayed.
Conditions This symptom is observed during a test on a Cisco 7500 series router that is running
Cisco IOS Release 12.0(22)S.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2036
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
Temporary Workaround Enter the clear interface type number EXEC command each time the
symptom occurs.
•
CSCdy39079
Symptoms If a channel is shut down while there is a large amount of line-rate traffic flowing through
a line card, the channel may stay down even after you enter the no shutdown interface configuration
command on the interface on which the channel is configured. If you enter the shutdown interface
configuration command followed by the no shutdown interface configuration command multiple
times on the affected interface, the channel still does not come back up.
Conditions This symptom is observed under rare situations.
Workaround There is no workaround. To recover from the situation, reload the line card.
•
CSCdy39795
Symptoms The CPUs of all line cards on a router may show very high utilization, and interprocess
communication (IPC) between the Route Processor (RP) and the line cards may fail, which may
disable the Forwarding Information Base (FIB) and Multicast Distributed Fast Switching (MDFS)
and may cause line cards to reload.
Conditions These symptoms are observed on a Cisco 12400 series router that is running Cisco IOS
Release 12.0(22.3)S when there is a large number of Multiprotocol Label Switching traffic
engineering (MPLS TE) tunnel interfaces configured and the ip multicast-routing distributed
global configuration command is enabled.
Workaround There is no workaround.
•
CSCdy40704
Symptoms When you disable Link Bundling on the interfaces of a Cisco 12000 series Engine 2 line
card, single-mode Link Bundling microcode is not unloaded.
Conditions This symptom is observed when Link Bundling is configured on a Cisco 12000 series
router.
Workaround Reload default microcode onto the affected line cards.
•
CSCdy41363
Symptoms Incoming traffic may be dropped because of giant packets.
Conditions This symptom is observed when packets that are larger than 16,000 bytes come in and
cause a significant memory leak in the packet memory.
Workaround There is no workaround.
•
CSCdy41415
Symptoms The global configuration mode becomes unlocked before a standby Route Processor (RP)
is fully booted up.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.03)S and that is configured with two RPs.
Workaround There is no workaround.
•
CSCdy41605
Symptoms Traffic cannot pass out of a priority queue.
Conditions This symptom is observed on a Cisco 10000 series router when a priority queue is
configured on any interface.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2037
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy41760
Symptoms A standby Route Processor (RP) fails to come up to standby mode and reloads when a
switchover occurs.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with two
RPs. The LED shows that the secondary RP is in standby mode, but if you make a console
connection to the standby RP, the standby RP fails to respond.
Workaround There is no workaround.
•
CSCdy43056
Symptoms Continuous fragmented generic routing encapsulation (GRE) packets in the core may
cause a line card to reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S, Release 12.0(22)S, or Release 12.0(22.3)S.
Workaround There is no workaround.
•
CSCdy43671
Symptoms An Engine 0 ATM line card may reload.
Conditions This symptom is observed under rare circumstances when a Cisco 12000 series router is
booted up with Cisco IOS Release 12.0(21)ST3.
Workaround There is no workaround.
•
CSCdy46586
Symptoms “CBUS-4-FIXBADTXVC” tracebacks occur when traffic is being passed. These
tracebacks have no operational side effects.
Conditions This symptom is observed in Cisco IOS Release 12.0 S when Xconnect uses Layer 2
Tunneling Protocol version 3 (L2TPv3) for channelized interfaces with PPP or High-Level Data
Link Control (HDLC) encapsulation.
Workaround There is no workaround.
•
CSCdy46676
Symptoms Performance degradation may occur on an Engine 4 plus line card when traffic
engineering (TE) tunnel load balancing is enabled.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.3)S.
Workaround There is no workaround.
•
CSCdy47173
Symptoms A Route Processor (RP) may reload when you install a Flash card in slot 1 of the RP.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy47439
Symptoms The input queue on a Packet-over-SONET (POS) channel (that is, a physical interface in
a channel group) may be wedged.
Conditions This symptom is observed on a Cisco 12000 series router when you configure a POS
channel.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2038
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy47645
Symptoms You cannot attach an output service policy with Class-Based Weighted Fair Queueing
(CBWFQ) to an ATM subinterface that is configured for tag switching.
Conditions This symptom is observed on a Cisco 7500 series router.
Workaround There is no workaround.
•
CSCdy48075
Symptoms If an active Performance Routing Engine (PRE) fails before a standby Performance
Route Processor (PRP) is fully configured, the standby PRP may not perform a switchover correctly.
Conditions This symptom is observed on a Cisco 10000 series router in a redundant configuration.
Workaround Do not force a switchover until the standby PRP is fully initialized. If the active PRP
fails and the standby PRP does not switch over correctly, reload the standby PRP.
•
CSCdy48985
Symptoms During Intermediate System-to-Intermediate System (IS-IS) fragmentation through a
Layer 2 Tunneling Protocol version 3 (L2TPv3) session, a “%LINK-4-TOOBIG” error may occur.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.3)S.
Workaround There is no workaround.
•
CSCdy50509
Symptoms An extended security access control list (ACL) that has the “lt 0” or “gt 65535” keyword
should not match any port. However, when you use a Turbo ACL that has the access-list compiled
global configuration command enabled, the “lt 0” or “gt 65535” keyword will match any port.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Remove the “lt 0” or “gt 65535” keyword.
•
CSCdy51197
Symptoms Fast Reroute (FRR) may fail to trigger if the cause of the failure is registered in the Route
Processor (RP) when the link state is already down.
Conditions This symptom may be observed when triggers are delayed, for example when the pos
delay triggers interface configuration command is enabled.
Workaround Disable the pos delay triggers interface configuration command.
•
CSCdy52055
Symptoms The running configuration is no longer synchronized after you perform an online
insertion and removal (OIR) of the line card followed by a Stateful Switchover (SSO).
Conditions This symptom is observed on a Cisco 10000 series router that is functioning in a high
availability (HA) environment and that is connected to a Cisco 12000 series router via an 8-port Fast
Ethernet line card, a Gigabit Ethernet line card, or a Gigabit Ethernet Half-Height line card, when
the following sequence of events occurs:
a. The IP address of the line card is configured and saved to the startup configuration.
b. The Cisco 12000 series router issues a continuous ping.
c. You perform and OIR on the line card that connects the Cisco 10000 series router to the
Cisco 12000 series router.
d. When the continuous ping of the Cisco 12000 series router is registered again, you enter the
redundancy force-failover main-cpu EXEC command on the Cisco 10000 series router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2039
Resolved Caveats—Cisco IOS Release 12.0(23)S
The output of the show running-config EXEC command and the show ip interface brief EXEC
command displays that the line card that connects the Cisco 10000 series router to the Cisco 12000
series router no longer has an IP address configured.
Workaround To restore the proper configuration, enter the copy startup-config running-config
EXEC command.
•
CSCdy52168
Symptoms A standby Performance Routing Engine (PRE) may not detect all line cards, which
causes traffic not to resume after a Stateful Switchover (SSO) has occurred.
Conditions This symptom is observed on a Cisco 10000 series router.
Workaround There is no workaround.
•
CSCdy52429
Symptoms Label controlled ATM (LC-ATM) bindings may not come up after a Stateful Switchover
(SSO) is performed.
Conditions This symptom is observed on a Cisco 7500 series router that is configured with an
LC-ATM interface.
Workaround There is no workaround.
•
CSCdy53082
Symptoms There is no local tag in the Label Forwarding Information Base (LFIB) for a prefix or tag
that is learnt through IP version 4 (IPv4) Border Gateway Protocol (BGP).
Conditions This symptom is observed when the prefix or tag is redistributed through Interior
Gateway Protocol (IGP)/Label Distribution Protocol (LDP).
Workaround There is no workaround.
•
CSCdy54559
Symptoms If a policy map configuration is based on Multiprotocol Label Switching (MPLS)
experimental (EXP) bits, the Weighted Random Early Detection (WRED) profile matching on the
EXP bits is not accepted by the policy map.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy54781
Symptoms The software access control list (ACL) counter may not increase, but the hardware
counter does.
Conditions This symptom is observed when you apply an ACL to multiple interfaces and then
update the ACL.
Workaround First remove the ACL from the interfaces, update the ACL, and then apply the ACL
again to the interfaces.
•
CSCdy55441
Symptoms If a 128-line input access control list (ACL) is configured on an Engine 2 Quad OC-12
line card that has interfaces configured for Virtual Private Network (VPN) and one subinterface for
Frame Relay, the line card may reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22)S.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2040
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy55672
Symptoms Cisco Express Forwarding (CEF) entries are not installed correctly for loopback IP
version 6 (IPv6) addresses.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround To enable the entries to be installed, enter the shutdown interface configuration
command followed by the no shutdown interface configuration command on the affected interface.
•
CSCdy57386
Symptoms A router may reload when you change the router identity (ID).
Conditions This symptom is observed when an Any Transport over Multiprotocol Label Switching
(AToM) virtual circuit (VC) is operational.
Workaround To ensure that the router ID is not changed, configure a loopback interface and enter
the mpls ldp router-id loopback force command.
•
CSCdy59030
Symptoms On an active Route Processor (RP), label virtual circuits (LVCs) are created, but on a
standby RP, LVCs are not created and the control virtual circuit (VC) is blocked. When a switchover
occurs, LVCs are still present on an ATM line card. Because the Multiprotocol Label Switching
(MPLS) feature only deletes tag entries that time out, stray VCs may remain configured on the router
without being noticed.
Conditions These symptoms are observed when tag switching is configured over an ATM interface
that is installed in a router that functions in an MPLS environment. When the control VC is set up,
ATM LVCs are created automatically when routes are created, but they are only created on the active
RP and not on the standby RP.
Workaround There is no workaround.
•
CSCdy59340
Symptoms Multiprotocol Label Switching Virtual Private Network (MPLS VPN) may not function
on the subinterfaces of a 3-port Gigabit Ethernet (GE) line card. Border Gateway Protocol (BGP)
becomes stuck in the “open sent” state on a provider edge (PR) router that is connected to one end
of the GE link.
Conditions These symptoms are observed on a Cisco 12000 series router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(22.4)S when Ethernet over MPLS (EoMPLS) microcode
is loaded onto the 3-port GE line card.
Workaround There is no workaround.
•
CSCdy59895
Symptoms Traffic is not sent through a network when you use an ATM link between a Cisco
customer edge (CE) router and a Cisco provider edge (PE) router.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22.4.)S.
Workaround There is no workaround.
•
CSCdy65452
Symptoms A standby Route Processor (RP) reloads during initialization.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with two RPs
when the Stateful Switchover (SSO) feature is enabled.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2041
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy66571
Symptoms The shadow state on a standby Route Processor (RP) remains down after you enter the
shutdown interface configuration command followed by the no shutdown interface configuration
command on the router interfaces.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with two RPs
when the Stateful Switchover (SSO) feature is enabled.
Workaround There is no workaround.
•
CSCdy67004
Symptoms The following error message may be displayed on the console of a standby Performance
Routing Engine (PRE):
%CHSTM1-3-STATESYNC: Redundancy state synchronization failure slot 1/0 - (invalid
parameters)
This message indicates that some of the redundancy features are not functioning correctly on a
1-port channelized OC-12 line card.
Conditions This symptom is observed when at least one 1-port channelized OC-12 line card is
installed in a Cisco 10000 series router that is configured with redundant PREs.
Workaround There is no workaround.
•
CSCdy73001
Symptoms If a primary Clock Scheduler Card (CSC) is pulled out and reinserted while traffic
through an OC-48 line card is running, the inbound traffic will stop being forwarded and the line
card may reload.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy74457
Symptoms The forwarding of IP version 6 (IPv6) packets from a Cisco 12000 series Engine 3 line
card to a Cisco 12000 series Engine 0 line card does not function for certain directly connected hops.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S or Release 12.0(22)S1.
Workaround There is no workaround.
•
CSCdy74512
Symptoms Layer 2 Tunneling Protocol version 3 (L2TPv3) Ethernet Xconnect does not transport
802.3-encapsulated packets such as Systems Network Architecture (SNA) packets, Connectionless
Network Protocol (CLNP) packets, and Intermediate System-to-Intermediate System (IS-IS)
packets.
Conditions This symptom is observed on Cisco 7200 series routers and low-end platforms. The
symptom is also observed on Cisco 7500 series routers in nondistributed mode.
Workaround There is no workaround.
•
CSCdy75485
Symptoms All Layer 2 management packets are dropped, which causes all interfaces that depend
upon keepalives to transition to the down state.
Conditions This symptom is observed on a Cisco 10000 series router in a configuration with a large
numbers of interfaces.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2042
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy76964
Symptoms When you configure Per-Packet Load Balancing (PPLB) and Layer 2 Tunneling Protocol
version 3 (L2TPv3) on a 3-port Gigabit Ethernet line card, L2TPv3 may drop packets.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.4)S.
Workaround Disable PPLB on the line card.
•
CSCdy78808
Symptoms An Engine 2 line card may generate “QM-4-STUCK” messages and may stop forwarding
traffic.
Conditions This symptom is observed on a Cisco 12000 series router when an adjacent router is
booted up.
Workaround Reload microcode onto the Engine 2 line card.
•
CSCdy81016
Symptoms An ATM interface may have some initialization difficulties. Although a ping can pass the
ATM interface, when the ATM interface sends traffic and the traffic rate is more than 10 packets per
second, the packets will be dropped.
Conditions This symptom is observed randomly. After the router has booted up, some ATM
subinterfaces function correctly, whereas some do not.
Workaround Remove the virtual circuit (VC) under the affected subinterface, and reconfigure the
VC.
•
CSCdy81098
Symptoms A Cisco router may reload when a Multiprotocol Label Switching traffic engineering
(MPLS TE) tunnel interface changes to the “Up” state.
Conditions This symptom is observed when load-balanced Interior Gateway Protocol (IGP) paths
are configured.
Workaround There is no workaround.
•
CSCdy81738
Symptoms The routes in a Cisco Express Forwarding (CEF) table may be mismatched between the
Gigabit Route Processor (GRP) and the line cards. You can clear the mismatch by entering the clear
cef linecard EXEC command, but if the routes are relearned, the situation will reoccur.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(21)S4 or Release 12.0(22)S when an access control list (ACL) is
configured to deny Simple Network Management Protocol (SNMP) packets.
Workaround Disable the ACL that denies the SNMP packets.
Alternate Workaround Run Cisco IOS Release 12.0(21)S3.
•
CSCdy82049
Symptoms Applying some features that are found in the Vanilla uCode bundle on interfaces that
have Xconnect enabled may cause Internet Control Message Protocol (ICMP) to fail when the
maximum transmission unit (MTU) is exceeded.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.4)S.
Workaround Remove the above-mentioned features from interfaces that have Xconnect enabled.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2043
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCdy86230
Symptoms The Small Form-Factor Plugable (SFP) command-line interface (CLI) is enabled on
production images. It should be enabled on nonproduction images and disabled on production
images.
Conditions This symptom is observed in Cisco IOS Release 12.0 S.
Workaround There is no workaround.
•
CSCdy87479
Symptoms An OC-12 Dynamic Packet Transport (DPT) line card may reload when IP version 6
(IPv6) is configured on the interface.
Conditions This symptom is observed when IPv6 traffic enters the interface.
Workaround Unconfigure IPv6 on the interface, and use tunnels instead.
•
CSCdy87514
Symptoms A Gigabit Route Processor (GRP) or line card may reload at
tfib_frr_update_group_output_if.
Conditions This symptom is observed on a Cisco 12000 series router that is configured for
Multiprotocol Label Switching traffic engineering (MPLS TE) with Fast Reroute (FRR).
Workaround There is no workaround.
•
CSCdy89077
Symptoms A Cisco 12000 series Engine 2 line card may incorrectly drop all packets that are
destined for the router. This condition may result in the loss of routing protocol packets, and the
protocol connectivity with neighbors may reset.
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(18)ST or a later release, or Release 12.0(22)S or a later release when heavy utilization
of the CPU of the line card occurs.
Workaround There is no workaround.
•
CSCdz00424
Symptoms A line card reloads when you enter the shutdown PVC range configuration command
followed by the no shutdown PVC range configuration command on a permanent virtual circuit
(PVC) through which traffic flows.
Conditions This symptom is observed only when there are multiple PVCs configured and does not
occur when a single PVC is shut down and brought up again.
Workaround There is no workaround.
•
CSCdz06149
Symptoms When an input access control list (ACL) is configured and the ip unreachables interface
configuration command is enabled (which is enabled by default) on an interface, a low rate of packet
leakage occurs for those packets that are dropped by the ACL. The rate is the same or less than the
expected rate of Internet Control Message Protocol (ICMP) unreachable packets that are sent back
to the source. The leak occurs only for IP packets (without the IP Header [L3] option) that have a
size that is smaller than 56 bytes.
Conditions This symptom is observed in Cisco IOS Release 12.0 S on a Cisco 12000 series 4-port
OC-48c/STM-16c Packet-over-SONET Enhanced Services line card and on a Cisco 12000 series
1-port OC-192c/STM-64 Packet-over-SONET Enhanced Services line card.
This symptom does not occur in Cisco IOS Release 12.0 ST.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2044
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
Workaround Enter the no ip unreachables interface configuration command on the interface to
prevent the packet leakage. However, in this situation, ICMP unreachable packets are not sent back
to the source when packets are dropped by the ACL.
•
CSCdz06300
Symptoms The IP Source Tracker feature unexpectedly stops functioning on a line card, and packets
for the source-tracked destination are not forwarded because the IP Source Tracker feature is stuck
in the throttling mode.
Conditions This symptom is observed on a Cisco 12000 series Engine 2 line card. To determine if
the line card is in the above-mentioned condition, enable the debug lc hw-throttle hidden
command; if the following message recurs every two seconds—even when there is low CPU
utilization—the IP Source Tracker feature is stuck in the throttling mode:
SLOT 0: GLC_HW: Disabled HW DOS throttling (CPU at 0%, sched skew: -1%)
Workaround Reload the line card.
•
CSCdz07976
Symptoms An Engine 2 line card may reload continuously.
Conditions This symptom is observed on a Cisco 12000 series router when a router that is adjacent
to the Cisco 12000 series router is rebooted while Border Gateway Protocol (BGP) policy
accounting is configured on the Engine 2 line card and traffic is flowing through the line card.
Workaround There is no workaround. When this situation occurs, stop the traffic that is flowing
through the Engine 2 line card until Cisco Express Forwarding (CEF) is loaded onto the line card.
•
CSCin10067
Symptoms When member links are removed from a multilink bundle (M2) and configured as
members of another multilink bundle (M5), the M5 multilink bundle does not come up.
Conditions This symptom is observed only with the distributed Multilink PPP (MLP) feature when
a member link is reconfigured to be a member link of another multilink bundle. This symptom is
observed only on Cisco 7500 series and Cisco 7600 series routers.
Workaround There is no workaround.
•
CSCin10568
Symptoms Untagged entries appear in the Tag Forwarding Information Base (TFIB).
Conditions This symptom is observed when you toggle a Label Distribution Protocol (LDP)/Tag
Distribution Protocol (TDP) session by toggling the LDP router identification (ID). This situation
occurs in Cisco IOS Release 12.0 (21.1)S2, Release 12.0(21.1)SY2, Release 12.2(8.4),
Release 12.2(8.4)S, Release 12.2(8.5)T, or later versions of the above-mentioned releases.
Workaround Enter the clear ip route network command to recover from the situation.
•
CSCdz10787
Symptoms When a label switching router (LSR) reroutes some destinations and selects another
interface, the upstream LSR for these destinations may lose the headend label bindings for them.
Conditions This symptom is observed in a Multiprotocol Label Switching (MPLS) ATM network
when Intermediate System-to-Intermediate System (IS-IS) is used as the routing protocol.
Temporary Workaround Enter the clear ip route network EXEC command for the affected
destinations until the symptom occurs again.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2045
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCin12742
Symptoms The alarm indication signal (AIS) that is sent by a port adapter is not recognized. The
AIS that is sent by the port adapter does not conform to existing standards.
Conditions This symptom is observed in a network in which two T3 multichannel port adapters
(PA-MC-2T3) are configured in a back-to-back configuration for M23 framing.
Workaround There is no workaround.
•
CSCuk35272
Symptoms A Cisco 12000 series Internet router may reload when the shutdown interface
configuration command followed by the no shutdown interface configuration command is entered
on a multilink bundle that is connected to a Cisco 7200 series router.
Conditions This symptom is observed on a Cisco 12000 series Internet router that has a 2-port
CHOC3/STM1 T1/E1 line card that is connected through an Add-Drop Multiplexor (ADM) to a
Cisco 7200 series router that has a channelized E1 PRI port adapter. This symptom is observed in
Cisco IOS Release 12.0(17)ST6 and Release 12.0(21)ST2.
Workaround There is no workaround.
•
CSCuk35313
Symptoms A Cisco 12000 series 8-port Packet-over-SONET OC-3c/STM-1 line card may reload.
Conditions This symptom is observed when the encapsulation type of one of the interfaces of the
line card is set to Frame Relay.
Workaround There is no workaround.
•
CSCuk35848
Symptoms Adjacencies that are required to forward packets to an IP Service Engine (ISE) line card
are not created properly, and packets cannot be forwarded through a pseudowire or tunnel.
Conditions This symptom is observed on a Cisco 12000 series router when Layer 2 Tunneling
Protocol version 3 (L2TPv3) and generic routing encapsulation (GRE) are configured.
Workaround There is no workaround.
•
CSCuk36097
Symptoms The “receive” adjacency of an IP Service Engine (ISE) line card may not be created
correctly on ingress line cards. This situation prevents a generic routing encapsulation (GRE) tunnel
from forwarding packets.
Conditions This symptom is observed when a Cisco 12000 series router is configured with an ISE
line card and with more than one GRE tunnel.
Workaround There is no workaround.
•
CSCuk36359
Symptoms A Layer 2 Tunneling Protocol version 3 (L2TPv3) connection may not function because
the tunnel endpoint cannot be learned.
Conditions This symptom is observed in Cisco IOS Release 12.0(22.1)S.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2046
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(23)S
•
CSCuk37123
Symptoms Traffic that is sent from an Engine 3 line card over the switch fabric to Multilink PPP
(MLP) bundles that are configured on a 2-port channelized OC-3/STM-1 (DS1/E1) line card drops.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S2 or Release 12.0(22.3)S and that is configured with a 4-port IP Service Engine
(ISE) OC-12c/STM-42 Packet-over-SONET line card and a 2-port channelized OC-3/STM-1
(DS1/E1) line card.
Workaround There is no workaround.
•
CSCuk37799
Symptoms A Cisco 12000 series IP Service Engine (ISE) line card reloads when you exceed the
hardware limitation during the configuration of an access control list (ACL).
Conditions This symptom is observed after you have first attached the ACL to several Frame Relay
subinterfaces.
Workaround First configure the ACL, and then attach it to the subinterfaces.
•
CSCuk38075
Symptoms Web Cache Communication Protocol (WCCP) does not function properly when
Cisco Express Forwarding (CEF) is enabled. Bypass packets from the cache engine are dropped
instead of being forwarded.
Conditions This symptom is observed when both WCCP and CEF are enabled.
Workaround Disable CEF on the router, and rely on IP fast switching.
Novell IPX, XNS, and Apollo Domain
•
CSCdx83726
Symptoms A router may display a bus error or, if a hard watchdog reset is performed, the router may
display a hard watchdog reset_message.
Conditions This symptom is observed on a router that is running Cisco IOS Release 12.2 PI when
Internetwork Packet Exchange (IPX) Enhanced Interior Gateway Routing Protocol (EIGRP) is being
used.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2047
Resolved Caveats—Cisco IOS Release 12.0(23)S
Wide-Area Networking
•
CSCdv16842
Symptoms A router may reload when it is performing heavy IP Control Protocol (IPCP) address
negotiations such as those that occur when several hundred links are brought up simultaneously on
an ATM or Frame Relay interface.
Conditions This symptom is observed when several hundred IPCP sessions are renegotiated without
a recycle of Link Control Protocol (LCP).
Workaround There is no workaround.
•
CSCdw87830
Symptoms If you copy the configuration to the running configuration using TFTP, not all of the
multilink bundles may transition into the “Up” state.
Conditions This symptom is observed on a Cisco 10000 series router that has a configuration with
many multilink bundles.
Workaround There is no workaround.
•
CSCdy16126
Symptoms Frame Relay switching does not work on a router when distributed Cisco Express
Forwarding (CEF) is configured.
Conditions This symptom is observed if a switched data-link connection identifier (DLCI) is
configured directly on a Local Management Interface (LMI) DTE interface on a Cisco 7500 router
that has distributed Cisco Express Forwarding (DCEF) configured by entering the frame-relay
interface-dlci dlci interface configuration command.
This symptom does not occur with an LMI DCE or a Network Node Interface (NNI).
Workaround Use the frame-relay route interface configuration command on the DTE instead of the
frame-relay interface-dlci dlci interface configuration command.
•
CSCdy17559
Symptoms The frame-relay map interface configuration command may not synchronize correctly
to a standby Route Processor (RP).
Conditions This symptom is observed on a Cisco 12000 series router when Frame Relay switching
occurs. The symptom is not observed when back-to-back Frame Relay encapsulation is configured.
Workaround There is no workaround.
•
CSCdy27349
Symptoms A locally switched Frame Relay connection that is enabled with the connect Frame
Relay global configuration command may remain administratively down after a Stateful Switchover
(SSO) has occurred, even though the permanent virtual circuit (PVC) state is “active.”
Conditions This symptom is observed on a Cisco 7500 series router. The symptom does not occur
when you enable the locally switched Frame Relay connection with the frame-relay route interface
configuration command.
Workaround To reestablish the connection, enter the no shutdown interface configuration command
in the connect submode.
Alternate Workaround To reestablish the connection, enter the shutdown interface configuration
command followed by the no shutdown interface configuration command on one of the Frame
Relay interfaces.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2048
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S6
•
CSCin15119
Symptoms A router may reload because of an SSS memory allocation failure (MALLOCFAIL)
during a session establishment.
Conditions This symptom is observed on a Cisco router that functions as a Virtual Private Dialup
Network (VPDN) home gateway (HGW) that is using Layer 2 Forwarding (L2F), Layer 2 Tunneling
Protocol (L2TP), or PPP Tunnel Protocol (PPTP) as the tunneling protocol.
Workaround There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(22)S6
Cisco IOS Release 12.0(22)S6 is a rebuild of Cisco IOS Release 12.0(22)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(22)S6 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
IP Routing Protocols
•
CSCec16481
A Cisco device running Internetwork Operating System (IOS) and enabled for the Open Shortest
Path First (OSPF) Protocol is vulnerable to a Denial of Service (DoS) attack from a malformed
OSPF packet. The OSPF protocol is not enabled by default.
The vulnerability is only present in IOS release trains based on 12.0S, 12.2, and 12.3. Releases based
on 12.0, 12.1 mainlines and all IOS images prior to 12.0 are not affected. Refer to the Security
Advisory for a complete list of affected release trains.
Further details and the workarounds to mitigate the effects are explained in the Security Advisory
which is available at the following URL:
http://www.cisco.com/warp/public/707/cisco-sa-20040818-ospf.shtml.
Miscellaneous
•
CSCdy74384
Symptoms: Per Interface Rate Control (PIRC) does not act on IP traffic that would have otherwise
been tagged (MPLS) if the current hop was not the penultimate hop for a given destination. PIRC
does not act on IP traffic with destination addresses that have an implicit-null label as their label
binding.
Conditions: This symptom is observed on a Cisco 12000 series router.
Workaround: There is no workaround.
•
CSCdz54497
This caveat consists of two symptoms, two conditions, and two workarounds:
Symptom 1: The interface index of a tunnel interface may be corrupt, and the output of the show
running-config privileged EXEC command may display the following information:
%FIB-2-IFINDEXILLEGAL: An internal software error occurred. Argument ifindex is out
of bounds at -1.
Condition 1: This symptom is observed on a Cisco 7500 series after a switchover has occurred and
you first add a tunnel interface, then remove the tunnel interface, and then add the tunnel interface
again.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2049
Resolved Caveats—Cisco IOS Release 12.0(22)S6
Workaround 1: There is no workaround.
Symptom 2: Cisco Express Forwarding (CEF) may not form adjacencies across a 2-port
multichannel T3 port adapter (PA-MC-2T3+) as is indicated in the output of the show cef interface
type number EXEC command (in this example, serial interface 12/0/0/8:0 is used):
% CEF IDB corresponding to Serial12/0/0/8:0 is not found
Condition 2: This symptom is observed on a Cisco 7500 series after a switchover has occurred and
you first add a serial interface, then remove the serial interface, and then add the serial interface
again.
Workaround 2: There is no workaround.
•
CSCea05010
Symptoms: An outgoing adjacency for a Virtual Private Network (VPN) routing/forwarding (VRF)
prefix always points to a virtual interface in distributed Cisco Express Forwarding (dCEF).
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S5.
Workaround: There is no workaround.
•
CSCeb54951
Symptoms: A Performance Route Processor (PRP) on a Cisco 12000 series can reload with a
SIGTRAP exception after receiving a 1612 bytes or longer frame on an Ethernet0 or Ethernet1
interface.
Conditions: This symptom is observed only on the PRP. The Gigabit Route Processor (GRP) is not
affected.
Workaround: Isolate the PRP Ethernet ports to an isolated Ethernet segment.
•
CSCeb81538
Symptoms: An Engine 4 line card may reload when an Engine 2 line card sends a corrupt
Multiprotocol Label Switching (MPLS) packet.
Conditions: This symptom is observed on a Cisco 12000 series that is configured for MPLS.
Workaround: There is no workaround.
•
CSCec13559
Symptoms: On Packet-over-SONET (POS) Engine 2 line cards for a Cisco 12000 series router,
IP2TAG traffic does not get rate limited by Per Interface Rate Control (PIRC).
Conditions: This symptom is observed when PIRC is enabled on ingress interface, Multiprotocol
Label Switching (MPLS) is enabled on egress interface, and the IP destination is more than one hop
away. This symptom is also observed on Engine 2 Gigabit Ethernet line cards.
Workaround: There is no workaround.
•
CSCec16725
Symptoms: Ethernet over Multiprotocol Label Switching (EoMPLS) disposition fails for an egress
Packet-over-SONET (POS) Engine 4 plus (E4+) line card. Tag bytes increment as traffic comes in,
but nothing is sent out the egress 3-port Gigabit Ethernet (GE) interface.
Conditions: This symptom is observed on a Cisco 12416 router that is running Cisco IOS
Release 12.0(22)S5.
Workaround: Use a different card or router for the EoMPLS disposition, but do not use the E4+ line
card.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2050
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S5
•
CSCec20473
Symptoms: A 3-port Gigabit Ethernet (GE) line card may stop transmitting traffic.
Conditions: This symptom is observed on a Cisco 12000 series that is configured as a Multiprotocol
Label Switching (MPLS) provider edge (PE) router that is running Cisco IOS Release 12.0(25)S1.
Workaround: Use the hw-module slot x reload privileged EXEC command.
Resolved Caveats—Cisco IOS Release 12.0(22)S5
Cisco IOS Release 12.0(22)S5 is a rebuild of Cisco IOS Release 12.0(22)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(22)S5 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
Basic System Services
•
CSCdv75121
Symptoms: A master Route Switch Processor (RSP) may cause a router to pause indefinitely or
reload.
Conditions: This symptom is observed on a Cisco 7500 series router that is configured with a line
card when the write memory EXEC command is entered and when the line card reloads while the
write memory EXEC command is being processed.
Workaround: There is no workaround.
•
CSCdz87017
Symptoms: Information about a port adapter (PA) may be missing from the output of a show diag
EXEC command.
Conditions: This symptom is observed on a controller with a memory size of 128 MB DRAM and
8192 KB SRAM. The controller displays the following information:
PA Bay 0 Information: Fast-Ethernet PA, 1 ports, 100BaseTX-ISL EEPROM format version
0 HW rev 0.00, Board revision UNKNOWN Serial number: 00000000 Part number: 00-0000-00
PA Bay 1 Information: Fast-Ethernet PA, 1 ports, 100BaseTX-ISL EEPROM format version
1 HW rev 1.00, Board revision A0 Serial number: 08534388 Part number: 73-1688-04
This condition is seen after upgrading from Cisco IOS Release 12.2(11)T to Cisco IOS
Release 12.2(13)T.
Workaround: There is no workaround.
IP Routing Protocols
•
CSCdu53656
A Cisco device running IOS and enabled for the Border Gateway Protocol (BGP) is vulnerable to a
Denial of Service (DOS) attack from a malformed BGP packet. The BGP protocol is not enabled by
default, and must be configured in order to accept traffic from an explicitly defined peer. Unless the
malicious traffic appears to be sourced from a configured, trusted peer, it would be difficult to inject
a malformed packet. BGP MD5 is a valid workaround for this problem.
Cisco has made free software available to address this problem. For more details, see the advisory
at http://www.cisco.com/warp/public/707/cisco-sa-20040616-bgp.shtml.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2051
Resolved Caveats—Cisco IOS Release 12.0(22)S5
•
CSCdx02283
Symptoms: A Cisco router does not register correctly with a Route Processor (RP) over a generic
routing encapsulation (GRE) tunnel. The output of the debug ip pim [group] privileged EXEC
command shows that the register is being sent but that the RP does not receive it.
Conditions: This symptom is observed on a Cisco router that has a directly connected source in a
GRE tunnel environment.
Workaround: There is no workaround.
•
CSCdz10505
Symptoms: When a neighbor under virtual route forwarding (VRF) is configured using the bgp
graceful-restart router configuration command, the session does not begin. A notification
regarding the wrong OPEN message is generated.
Conditions: This symptom is observed only when the router is configured using the bgp
graceful-restart router configuration command.
Workaround: There is no workaround.
•
CSCea28131
A Cisco device running IOS and enabled for the Border Gateway Protocol (BGP) is vulnerable to a
Denial of Service (DOS) attack from a malformed BGP packet. The BGP protocol is not enabled by
default, and must be configured in order to accept traffic from an explicitly defined peer. Unless the
malicious traffic appears to be sourced from a configured, trusted peer, it would be difficult to inject
a malformed packet. BGP MD5 is a valid workaround for this problem.
Cisco has made free software available to address this problem. For more details, see the advisory
at http://www.cisco.com/warp/public/707/cisco-sa-20040616-bgp.shtml.
•
CSCea64725
Symptoms: If a peer group is slow to establish and comes up while other members of the peer group
are converging, the recently established member may not advertise the routes that were sent to the
other members.
Conditions: This symptom occurs only if the new peer group member comes up while the other
members of a peer group are converging. This symptom does not occur if the new peer group
member comes up after the other members of the peer group have finished converging.
Workaround: The routes can be readvertised by entering the clear ip bgp peer-group-name soft out
privileged EXEC command for any peer that has missing routes.
•
CSCeb00172
Symptoms: When the neighbor {ip-address | peer-group-name} default-originate router
configuration command is used with a peer group, peers that belong to that peer group come up at
a different time from when the Border Gateway Protocol (BGP) is formatting updates. Because of
this behavior, the router may not advertise all routes to members of the peer group.
Conditions: This symptom is observed with IP version 4 (IPv4) unicast and Virtual Private Network
(VPN) routing/forwarding (VRF) address family (AF) packets.
Workaround: There is no workaround.
•
CSCeb00180
Symptoms: Border Gateway Protocol (BGP) update generation may pause indefinitely when BGP
is converging.
Conditions: This symptom may occur under any of the following six conditions when BGP is
converging:
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2052
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S5
1. When non-peer-group peer sessions flap or when the clear ip bgp address privileged EXEC
command is entered several times for a non-peer-group peer.
2. When the clear ip bgp * soft out privileged EXEC command is entered repeatedly in rapid
succession.
3. When peers are moved in or out of peer groups.
4. When routers that are configured with unicast assured forwarding (AF) and AF only are reloaded.
5. When all members of a peer group are cleared by performing either a hard reset or a soft reset. In
this situation, only the peer group is affected.
6. When some routes are advertised to or withdrawn from the router while the router is converging,
some peers in a peer group may not receive all the updates.
Workaround: There is no workaround for conditions 1 through 5.
To recover from condition 6, enter the clear ip bgp neighbor-address soft out privileged EXEC
command. For the neighbor-address argument, use the IP address of the peer that did not receive all
of the updates.
•
CSCeb14687
Symptoms: Border Gateway Protocol (BGP) may send incomplete updates to the peer routers, and
some routers may not send full routes to their peer routers. This behavior may cause some routes to
be missing from the peer.
Conditions: This symptom is observed when a slow BGP peer in a peer group comes up while BGP
is in the process of sending updates to the peer routers. This symptom is not platform specific.
Workaround: Enter the clear ip bgp peer- address soft out EXEC command to clear this condition.
Avoid using a peer group if possible.
Miscellaneous
•
CSCdx59003
Symptoms: A Cisco 12000 series Internet router may report incorrect environmental values, as the
following environmental logs display:
%ENV_MON-2-VOLTAGE: MBUS 5V supply(slot 1) volts has reached SHUTDOWN level at 5 m(V)
%ENV_MON-2-TEMP: Hotpoint temp sensor(slot 17) temperature has reached SHUTDOWN level
at 756(C) %ENV_MON-2-VOLTAGE: Card 3.3v supply(slot 17) volts has reached CRITICAL
level at 2560 m(V)
Although the environmental logs indicate that the shutdown level has been reached, the router does
not shut down the line cards for which the incorrect environmental values are reported.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)S3, Release 12.0(21)S5, Release 12.0(21)ST2, or Release 12.0(22)S.
Workaround: There is no workaround.
•
CSCdy89749
Symptoms: A Gigabit Ethernet Interface Processor plus (GEIP+) may report many alignment errors
and the CPU utilization may stay at 100 percent.
Conditions: This symptom is observed on a Cisco 7500 series router.
Workaround: There is no workaround.
•
CSCdz04297
Symptoms: A router may pause indefinitely instead of restarting.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2053
Resolved Caveats—Cisco IOS Release 12.0(22)S5
Conditions: This symptom is observed when the router is handling invalid addresses in the cached
address space.
Workaround: There is no workaround.
•
CSCdz22526
Symptoms: If distributed Cisco Express Forwarding (dCEF) is configured on a generic routing
encapsulation (GRE) provider edge (PE) router, IP packets are ignored and dropped on the Versatile
Interface Processor (VIP) interface.
Conditions: This symptom is observed on a Cisco 7500 series that is running Cisco IOS
Release 12.2(12.14)T.
Workaround: Use Cisco Express Forwarding (CEF).
•
CSCdz59683
Symptoms: After the ALPHA application-specific integrated circuit (ASIC) is reset because of error
recovery (that may be caused by parity errors in ALPHA memory), the port or fetch descriptors that
select correct threads in ALPHA microcode are not programmed correctly. This behavior may
prevent certain configured features, such as IP version 6 (IPv6) or IP Virtual Private Network (VPN)
routing/forwarding (VRF), from working correctly.
Conditions: This symptom is observed on the line card of a Cisco 12000 series.
Workaround: Reset the line card.
•
CSCdz71127
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
•
CSCdz72673
Symptoms: A Cisco router that is functioning as a Multiprotocol Label Switching (MPLS) Virtual
Private Network (VPN) provider edge (PE) router may reload with an “address error” message.
Conditions: This symptom is observed at bootup time when the PE and customer edge (CE)
interfaces are coming up. The symptom occurs when a locally learned VPN routing/forwarding
(VRF) route temporarily loses its local label. This condition leads to some data structures being
cleaned up but still retaining references to the local label. It may also occur after bootup in the case
of interface flaps. The reload is not a common occurrence, however, and may need additional
triggers.
A list of the affected releases can be found at
http://www.cisco.com/cgi-bin/Support/Bugtool/onebug.pl?bugid=CSCdv49909. Cisco IOS
releases that are not listed in the “First Fixed-in Version” field at this location are not affected.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2054
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S5
•
CSCea02355
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
•
CSCea14108
Symptoms: Pings from a customer edge (CE) router may fail in an Any Transport over Multiprotocol
Label Switching (AToM) network.
Conditions: This symptom is observed when Ethernet over Multiprotocol Label Switching
(EoMPLS) AToM is configured.
Workaround: There is no workaround.
•
CSCea23999
Symptoms: A router may reload during a class of service (CoS) update in a Weighted Random Early
Detection (WRED) drops routine even though CoS and WRED are not configured on the router.
Conditions: This symptom is observed on a Cisco 12000 series.
Workaround: There is no workaround.
•
CSCea25707
Symptoms: A Cisco router may reload because of a software condition when running the LDP-MIB
MIB. The router reloads because of a process watchdog timeout in the “SNMP ENGINE” process
and logs an entry similar to the following one and logs a traceback:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = SNMP ENGINE.
%Software-forced reload
Unexpected exception, CPU signal 23, PC = 0x606F1FC4 ... Cause 00000024 (Code 0x9):
Breakpoint exception
Conditions: This symptom is observed after the router ID has been changed and when Label
Distribution Protocol (LDP) sessions have been added or removed.
Workaround: Do not change the router ID. If the router ID has been changed, do not run the
LDP-MIB MIB.
•
CSCea28471
Symptoms: A Versatile Interface Processor (VIP) may reload.
Conditions: This symptom is observed on a VIP if Multiprotocol Label Switching (MPLS), Egress
NetFlow, and distributed Cisco Express Forwarding (dCEF) are configured.
Workaround: Disable dCEF or Egress NetFlow.
•
CSCea28475
Symptoms: There is a mismatch between hardware and software Cisco Express Forwarding (CEF)
entries. The following EXEC commands are used to identify this situation:
show ip cef prefix internal
show ip hardware-cef prefix
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2055
Resolved Caveats—Cisco IOS Release 12.0(22)S5
Conditions: This symptom is observed on Cisco 12000 series E2 line cards that are running
Cisco IOS Release 12.0(22)S3 and that have about 100,000 prefixes in the routing table. The
symptom is not observed in Cisco IOS Release 12.0(23)S.
Workaround: Use the clear ip route prefix EXEC command.
•
CSCea28914
Symptoms: On the chassis of a Cisco 12410 Internet router with the primary clock and scheduler
card (CSC) located in slot 17, use of the hw- module slot 17 shutdown EXEC command may cause
a FIA-HALT on the Engine 4 (E4) and Engine 4 Plus (E4+) line cards in the router.
Conditions: This symptom is observed on a Cisco 12410 router that is running Cisco IOS
Release 12.0(21)S6.
Workaround: Do not use the hw-module slot 17 shutdown EXEC command.
•
CSCea32479
Symptoms: It may take a long time for a Cisco 12000 series to remove 250,000 Virtual Private
Network version 4 (VPNv4) entries from an Engine 3 line card. While the router removes the
VPNv4 entries, new VPNv4 entries cannot be updated on the line card.
Conditions: This symptom is observed when the router handles a large number (more than 80,000)
of VPNv4 entries on its line cards and when a Border Gateway Protocol (BGP) session flaps (that
is, the session remains down for a few minutes), causing the router to remove all VPNv4 entries and
to repopulate these entries a few minutes later.
Workaround: There is no workaround.
•
CSCea35292
Symptoms: When Multiprotocol Label Switching (MPLS) traffic or MPLS Virtual Private Network
(VPN) traffic is being forwarded by a Cisco 10720 router, about 50 percent of multicast traffic will
be punted to a Route Processor (RP) and forwarded by the RP. The expected behavior is that
multicast traffic should be forwarded by Parallel Express Forwarding (PXF) as long as a multicast
route (mroute) entry exists. If many packets are punted to the RP, and the RP queue is congested,
some of the multicast traffic that is being punted to the RP will be dropped. For example, multicast
traffic may be dropped from a multicast application such as video or TV broadcast.
Conditions: This symptom is observed on a Cisco 10720 router that is running Cisco IOS
Release 12.0(22)S, Release 12.0(23)S1, or Release 12.0(24)S when the following conditions are
met:
– The router forwards MPLS or MPLS VPN traffic and multicast traffic.
– The RP queue is congested.
Workaround: Stop the MPLS or MPLS VPN traffic.
•
CSCea37882
Symptoms: It may take about 10 minutes before a Versatile Interface Processor (VIP) synchronizes
with a Cisco Express Forwarding (CEF) table.
Conditions: This symptom is observed after you reload the VIP that has the Single Line Card Reload
(SLCR) feature and distributed CEF (dCEF) enabled, when there are about 40,000 prefixes in the
CEF table, and when Border Gateway Protocol (BGP) is in stable condition.
Workaround: Increase the interprocess communications (IPC) cache significantly; when there are
about 40,000 prefixes, increase the IPC cache using the ipc cache 3000 command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2056
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S5
•
CSCea38449
Symptoms: Frame Relay (FR) interfaces and subinterfaces may stop forwarding traffic if a
packet-queueing application-specific integrated circuit (ASIC) error is detected by Cisco IOS
software. Error recovery is invoked, but FR interfaces do not recover properly.
Conditions: This symptom is observed on a Cisco router that is configured with FR.
Workaround: Reload the line card.
•
CSCea52787
Symptoms: A memory leak may be observed on a line card with the Multicast Distributed Switching
(MDS) line card process when the ip multicast- routing global configuration command is enabled
while there are tunnel interfaces configured.
Conditions: This symptom occurs when the affected line card runs out of memory because of a
memory leak and the MDFS process on the line card attempts to allocate memory. This symptom
occurs only when multicast routing is enabled by entering the ip multicast-routing distributed
global configuration command and when a traffic engineering (TE) tunnel is configured.
Workaround: There is no workaround.
•
CSCea53471
Symptoms: A Cisco 12000 series that is configured with a Performance Route Processor 1 (PRP-1)
may pause indefinitely.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with a PRP-1 when
the configuration is being saved after it has previously received a break signal on the console. This
symptom does not affect the Gigabit Route Processor (GRP).
The break signal can be received by the router when it is sent intentionally by a terminal or when it
is unintentionally received as noise on the console connection. Unintentional noise may occur when
a terminal or terminal server that is connected to the router is powered off or when certain terminals
or personal computer terminal emulators are first connected. When the router pauses indefinitely, it
must be power-cycled to be restored to a normal working condition.
Workaround: There is no good workaround. Avoid use of the send break command during a Telnet
session or the use of terminal connections that send a break signal.
•
CSCea54482
Symptoms: A switch fabric card (SFC) switchover may occur, cyclic redundancy check (CRC)
Fabric Interface ASIC (FIA) errors may occur, and the following error message may be displayed
on a Cisco 12400 series:
FABRIC-3-ERR_HANDLE Due to CRC error from slot 8, shutdown the fabric card on slot 22
Note that the slot numbers (that is, 8 and 22) are just examples.
Conditions: These symptoms are observed after a Cisco 12400 series router that is configured with
one or more Engine 4 plus line cards is reloaded with a new Cisco IOS release that causes a
maintenance bus (MBus) download condition and while traffic is being processed on the router.
Workaround: After the router is reloaded with the new Cisco IOS release, reload the router for a
second time.
•
CSCea62360
Symptoms: A Cisco 12000 series Engine 3 (E3) line card may log “EE48-2GULF_TX_SRAM_ERROR” error messages if certain packet types are forwarded incorrectly.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2057
Resolved Caveats—Cisco IOS Release 12.0(22)S5
Conditions: This symptom is observed on Multiprotocol Label Switching (MPLS) Virtual Private
Network (VPN) provider edge (PE) routers when multicast traffic is destined for the customer edge
(CE) router.
Workaround: There is no workaround.
•
CSCea62745
Symptoms: The following error message may be generated often for slot 24 or 25 on a Cisco 12000
series:
%MBUS_SYS-3-NOBUFFER: Message from slot 25 in stream 0 dropped
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(21)S5 or Release 12.0(21)S6.
Workaround: There is no workaround.
•
CSCea74092
Symptoms: A router may incorrectly encapsulate packets when Multicast Distributed Switching
(MDS) is enabled. This situation causes traffic to be blackholed.
Conditions: This symptom is observed on a Cisco router that is configured with MDS and that has
a generic routing encapsulation (GRE) tunnel interface.
Workaround: There is no workaround.
•
CSCea77271
Symptoms: Packets may be dropped by a 3-port Gigabit Ethernet line card that is installed in a
Cisco 12000 series.
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(21)ST or Release 12.0(22)S when the following conditions are met:
– Some subinterfaces are configured for Ethernet over Multiprotocol Label Switching (EoMPLS).
– Some subinterfaces are configured for IP.
– Any interface on the router is configured with an output access control list (ACL).
– A packet is received on an IP subinterface, its 802.1p VLAN priority bits are different than the
IP precedence bits, and it is supposed to switch to the interface on which the output ACL is
applied.
Workaround: If this is an option, remove the output ACL, or use Cisco IOS Release 12.0(23)S or a
later release.
•
CSCea80322
Symptoms: All ports of an Engine 0 (E0) digital service 3 (DS3) card may remain in an “up/down”
condition indefinitely.
Conditions: This symptom is observed on Engine 0 (E0) DS3 cards when one of the ports receives
a “yellow” alarm.
Workaround: Enter the microcode reload global configuration command to microcode reload the
DS3 card.
•
CSCea91692
Symptoms: On a Cisco 12000 series router that is configured with an Engine-2- based line card that
carries both Multiprotocol Label Switching (MPLS) and IP traffic and that is forwarding packets to
an output port (that has a committed access rate [CAR] rule configured on an Engine-0, Engine-1 or
Engine-2-based output line card), the IP traffic may be dropped because of an incorrect packet
switching application-specific integrated circuit (PSA) Cisco Express Forwarding (CEF) entry.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2058
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S5
Conditions: This symptom is observed on a Cisco 12000 series that has been upgraded from
Cisco IOS Release 12.0(21)S5 to Release 12.0(22)S or Release 12.0(23)S. This configuration
requires that the traffic enter the router on an Engine 2 line card and leave the router on an Engine-0,
Engine-1, or Engine 2-based line card that has an output CAR applied to its port.
Workaround: Remove the output CAR rule from the egress line card to restore traffic.
•
CSCeb00391
Symptoms: The following error message may be displayed on a router:
%ALIGN-3-SPURIOUS: Spurious memory access made at 0x50164CDC reading 0x0
Conditions: This symptom is observed on a Cisco 12000 series.
Workaround: There is no workaround.
•
CSCeb05519
Symptoms: The core router Multiprotocol Label Switching (MPLS) forwarding entry has the correct
outgoing interface but has an incorrect label to use for sending traffic to the edge router. The
incorrect label is identical to the label that is sent by another core router for the same prefix through
another interface.
Conditions: This symptom is observed in a service provider network when the route to the prefix
that has the incorrect MPLS forwarding entry is configured using a static recursive route and the
specific IP address that is specified in the ip route prefix mask ip-address global configuration
command is changed by topology changes to go through a different adjacent router. The incorrect
outgoing Label Distribution Protocol (LDP) or Tag Distribution Protocol (TDP) label corresponds
to the router that was adjacent prior to the routing change.
Workaround: To clear this condition, enter the clear ip route {network [mask] | *} EXEC command
to cause MPLS to create a new forwarding entry that has the correct interface and label for the prefix.
To prevent this condition from occurring, advertise the route to the prefix in question using an
Interior Gateway Protocol (IGP).
Alternate Workaround: Configure a static nonrecursive route to the prefix and IP address of the
next-hop router by entering the ip route prefix mask ip-address interface-type interface-number
global configuration command.
•
CSCeb07559
Symptoms: A Cisco 8xOC3 Engine 2 (E2) ATM line card may generate ToFab (Toward the Fabric)
Buffer Management ASIC (BMA) data errors when an output access control list (ACL) is configured
on the Engine 0 card.
Conditions: This symptom is observed on a Cisco 8xOC3 E2 ATM line card that is running
Cisco IOS Release 12.0(22)S3. This release of Cisco IOS software does not support ACLs on a line
card with this configuration.
Workaround: There is no workaround. Disable ACLs on the 8xOC3 E2 ATM line card to prevent
this symptom.
Alternate Workaround: Upgrade to Cisco IOS Release 12.0(22)S5.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2059
Resolved Caveats—Cisco IOS Release 12.0(22)S4
Resolved Caveats—Cisco IOS Release 12.0(22)S4
Cisco IOS Release 12.0(22)S4 is a rebuild of Cisco IOS Release 12.0(22)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(22)S4 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
Basic System Services
•
CSCdy74705
Symptoms: A NPE-200 network processing engine for Cisco 7200 series routers may experience
memory corruption issues.
Conditions: This symptom may occur during periods of high traffic, with packet sizes greater than
1524 bytes, and may seemingly be associated with port adapter (PA) rearrangements.
Workaround: Attempt port adapter rearrangement, or upgrade to a Cisco IOS release that contains
the software workaround (Release 12.0(23.03)S and later).
EXEC and Configuration Parser
•
CSCdy89041
Symptoms: A memory leak of about 0.5 MB occurs in the “Pre Command NV Buffer” process.
Conditions: This symptom is observed when you connect to a Cisco 12000 series Route Processor
(RP) through a vty.
Workaround: There is no workaround.
Interfaces and Bridging
•
CSCdx00274
Symptoms: A single-port Fast Ethernet 100BASE-TX port adapter (PA-FE-TX) on a
Cisco 7206VXR router may stop receiving burst traffic packets.
Conditions: This symptom is observed on a PA-FE-TX.
Workaround: To clear the symptom, enter the shutdown interface configuration command followed
by the no shutdown interface configuration command on the PA-FE-TX interface.
IP Routing Protocols
•
CSCdy60008
Symptoms: If the interface bandwidth or delay is changed, a router may reload.
Conditions: This symptom is observed after Enhanced Interior Gateway Routing Protocol (EIGRP)
is terminated via the no router eigrp as-number global configuration command or the no ip routing
global configuration command, causing the EIGRP process list to be invalid.
Workaround: Reload the router after terminating EIGRP.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2060
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S4
•
CSCdz33176
Symptoms: A Cisco router that is functioning as a dedicated Border Gateway Protocol (BGP) route
reflector in a network that is configured for BGP may display a message very similar to the
following one on its console:
%SYS-3-CPUHOG: Task ran for 30020 msec (6/6), process = BGP Router, PC = 6080D21C.
When the message is displayed, the BGP router process causes the CPU utilization of the router to
become high for one to several minutes, depending on the number of prefixes, neighbors, and
updates.
Conditions: This symptom is observed when the router is running Cisco IOS Release 12.0(22)S or
a later release, when it has a large number of neighbors that are configured in peer groups or update
groups, when it has a large number of prefixes to send or receive, and when most of the neighbors
start at the same time, or when the BGP sessions of the neighbors are reset at the same time using
the clear ip bgp * EXEC command.
The symptom is also observed in the above-mentioned network topology when the client of a BGP
route reflector is reset using the clear ip bgp* EXEC command.
In another network, the symptom is also observed on a Cisco router running 12.0(22)S1 using the
clear ip bgp * soft EXEC command.
Workaround: Do not reset all the BGP neighbor routers at the same time that route reflectors are
used in a BGP configuration.
Alternate Workaround: Use Cisco IOS Release 12.0 ST.
•
CSCdz39544
Symptoms: A Cisco router may discard a Multicast Source Discovery Protocol (MSDP) type length
value (TLV) prematurely.
Conditions: This symptom is observed when an MSDP encapsulated packet receives a TLV with
more than one Source-Active (SA) entry count.
Workaround: There is no workaround.
•
CSCdz45031
Symptoms: The distance eigrp router configuration command may not be displayed in the
configuration although the configured values are applied to the routes. After reloading the router,
the distance for Enhanced Interior Gateway Routing Protocol (EIGRP) routes returns to its default
value.
Conditions: This symptom is observed on a Cisco router when using EIGRP between a provider
edge (PE) and customer edge (CE) router in a Multiprotocol Label Switching (MPLS) environment.
Workaround: There is no workaround.
•
CSCdz45760
Symptoms: A useless partial Shortest Path First (SPF) calculation may occur.
Conditions: This symptom is observed when an Open Shortest Path First (OSPF) link-state
advertisement (LSA) for a 0.0.0.0 destination is refreshed.
Workaround: Use a static default route.
•
CSCdz55717
Symptoms: Configuring OSPF (Open Shortest Path First) sham links in a Multiprotocol Label
Switching (MPLS) Virtual Private Network (VPN) environment may cause a memory leak in the
OSPF router process.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2061
Resolved Caveats—Cisco IOS Release 12.0(22)S4
Conditions: This symptom is observed in a MPLS-VPN environment. The area [area- id] sham-link
[source-address] [destination-address] cost [number] global configuration command is used and
OSPF adjacency is formed over the sham-link. Each time an OSPF acknowledgment is sent over the
sham-link, some memory is allocated that is never freed.
Workaround: There is no workaround.
•
CSCdz58674
Symptoms: When an area border router receives type-4 link-state advertisements (LSAs) via the
nonbackbone, the router may incorrectly generate type-4 LSAs into the backbone. This situation
may cause a routing loop to occur.
Conditions: This symptom is observed in Cisco IOS Release 12.0(22)S or a later release or in
Release 12.2(10) or a later release when the following conditions occur:
– A router (referred to as Router 1) functions as an internal router in one particular area.
– Router 1 has an interarea route to an Autonomous System Boundary Router (ASBR) through
the same area.
– Router 1 is connected with another router (referred to as Router 2) in the backbone area, causing
Router 1 to become an ABR.
In this situation, Router 1 generates type-4 LSAs into the backbone area for the ASBR. This
situation should not occur and may lead to a routing loop.
Workaround: Reset the Open Shortest Path First (OSPF) process by entering the clear ip ospf
process privileged EXEC command.
•
CSCea03118
Symptoms: A provider edge (PE) router fails to advertise Border Gateway Protocol (BGP) routes to
the dual customer edge (CE) routers that converge last.
Conditions: This symptom is observed only on routers that are running Cisco IOS
Release 12.0(23) S1(012)) and causes compatibility issues with router convergence and update
processing.
Workaround: Use Cisco IOS Release 12.0(23)S2 or a later release.
ISO CLNS
•
CSCdz30118
Symptoms: On a Cisco router, Intermediate System-to-Intermediate System (IS-IS) IP version 6
(IPv6) routes may not be inserted into the IPv6 routing table after a reload or after a neighbor’s
interface state changes.
Conditions: This symptom is observed on a Cisco router that is running Cisco IOS Release
12.0(22)S and affects only configurations with level-2-only links.
Workaround: Use the clear isis * configuration command after the reload or the topology change.
Use level-1-2 links instead of level-2-only links.
•
CSCdz33882
Symptoms: A Route Processor (RP) may reload.
Conditions: This symptom is observed on a Cisco 12000 series that is configured with dual RPs in
Stateful Switchover (SSO) mode and that has about 200 Intermediate System-to-Intermediate
System (IS-IS) neighbors when Nonstop Forwarding (NSF) is configured under the IS-IS process.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2062
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S4
•
CSCdz61787
Symptoms: An SPF (shortest path first) loop may occur on a Cisco router.
Conditions: This symptom may be observed on a Cisco router that is running a Cisco IOS release
image that does not support a fix for CSCdz61787, has “ip fast-convergence” configured and there
are specific Intermediate System-to-Intermediate System (IS-IS) metrics.
The show isis spf-log EXEC command shows that the loop is triggered by BACKUPOVFL.
Following is an example of the SPF log output:
Router# show isis spf-log
Level 2 SPF log
01:25:10 0 18 1 BACKUPOVF
01:25:00 0 18 1 BACKUPOVFL
Workaround: Remove “ip fast-convergence” from every router where it is configured by using the
no ip fast-convergence EXEC command.
Alternative workaround: Adjust the IS-IS metrics.
•
CSCea00846
Symptoms: After a switchover, the Intermediate System-to-Intermediate System (IS-IS) takes about
10 minutes to fully recover and to install routes in the IP routing table.
Conditions: This symptom is observed on a Cisco 12000 series configured with IS-IS. The amount
of time required for the Gigabit Ethernet (GE) interface to load after a switchover is very close to
the amount of time of the IS-IS adjacency timeout. The device under test (DUT) is the designated
router.
Workaround: There is no workaround.
Miscellaneous
•
CSCdw10770
Symptoms: A Cisco 12000 series Internet router Engine 2 line card may experience errors, including
CPUHOGs, Cisco Express Forwarding (CEF) shutdown, and unexpected reloads.
Conditions: This symptom is observed on a Cisco Engine 2 line card if a route with multiple paths
is received when the forwarding table already includes more than 25,000 subnets.
It is important to note that Border Gateway Protocol (BGP) routes cannot have multiple paths unless
BGP multipath is specifically configured. Basic BGP best practices can ensure that there is nothing
to trigger this symptom. Workarounds are available to protect the network from Interior Gateway
Protocol (IGP) problems.
Workaround: The following workarounds may be tried for routers at risk from their IGP:
– Ensure that there are no more than 4000 load-balanced IGP (Open Shortest Path First [OSPF],
Intermediate System-to-Intermediate System [IS-IS], Routing Information Protocol [RIP],
Enhanced Interior Gateway Routing Protocol [EIGRP] routes in the routing table.
– Ensure that there are no prefixes with a mask of /11 or shorter (/1 to /11) in the IGP.
Following are a few ways to end up with short-length prefixes in the IGP:
– Summarize routes in the IGP (for example summarize routes from a non backbone area into
area 0).
– Configure an interface with a short-length mask and include that interface in the IGP.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2063
Resolved Caveats—Cisco IOS Release 12.0(22)S4
– Import such a route from another source (static, BGP).
If such a route is present in the IGP, it is recommended that it be broken up into its component /12
or longer prefix routes.
The best practices for routers with BGP implementations include the following:
– Use filters to block all routes with /1 to /7 masks at BGP peer borders.
– Use filters to prevent the routes from being advertised from outside the network.
– Use filters at the customer border to prevent the customers from advertising anything that they
have not explicitly requested.
These filters can be found at the following URL:
http://www.cisco.com/public/cons/isp/security/T-ip-prefix-filter-ingress-loose- check.txt
•
CSCdy22744
Symptoms: The fix for CSCdx47695 that was integrated into Cisco IOS Release 12.0(21)S3
introduced a throttling mechanism that may be used when the physical layer interface module
(PLIM) is congested. The throttling mechanism prevents interfaces or a bundle, or both, from
flapping when bidirectional traffic with small packets is sent through either a 6-port channelized T3
line card or a 2-port channelized OC-3/STM-1 (DS1/E1) line card.
The throttling mechanism produces a severe performance impact, although no link flaps occur.
Conditions: This symptom is observed on a Cisco 12000 series router.
Workaround: There is no workaround. The fix for this caveat consists of a knob for the throttling.
•
CSCdy37606
Symptoms: A Cisco 12000 series may generate the following message:
%LINK-3-TOOSMALL: Interface POS3/0, Output runt packet of 0 bytes
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS Release
12.0(21)S5, when an error occurs on an Engine 2 line card and when both sampled NetFlow and
Multiprotocol Label Switching (MPLS) are enabled.
Workaround: Disable sampled NetFlow. Note that this workaround affects service because disabling
sampled NetFlow causes Cisco Express Forwarding (CEF) to reload on the line card.
•
CSCdy42383
Symptoms: A Cisco 12416 router, that is running Cisco IOS Release 12.0(21)ST2 does not
load-balance traffic properly between two OC-48 packet-over-SONET (POS) interfaces (Engine 2
line cards).
Conditions: It has been observed that when a Cisco 12000 series Internet router has incoming traffic
from an Engine 4 card and outgoing traffic toward Engine 2 parallel links, load balancing does not
work properly. The symptom does not seem to occur when the incoming card has been changed to
an Engine 2 card.
Workaround: There is no workaround.
•
CSCdy46676
Symptoms: Performance degradation may occur on an Engine 4 plus line card when traffic
engineering (TE) tunnel load balancing is enabled.
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.3)S.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2064
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S4
•
CSCdy56799
Symptoms: Spurious access errors may occur on a Cisco 7500 series router.
Conditions: This symptom is observed on Cisco 7500 series that is configured with distributed Cisco
Express Forwarding (dCEF) and Web Cache Communication Protocol (WCCP).
Workaround: Disable dCEF on the interfaces that face the web cache engines where the spurious
access errors occur so that incoming WCCP generic routing encapsulation (GRE) packets are punted
to the route processor and CEF-switched.
For more information about spurious access errors, see the Cisco document at the following
location: http://www.cisco.com/warp/public/63/spuraccess.html.
•
CSCdy59895
Symptoms: Traffic is not sent through a network when an Asynchronous Transfer Mode (ATM) link
is used between a Cisco customer edge (CE) router and a Cisco provider edge (PE) router.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(23)S.
Workaround: There is no workaround.
•
CSCdy61223
Symptoms: When an input access control list (ACL) is configured and multiple broadcast Address
Resolution Protocol (ARP) requests are received, packet loss and performance degradation may
occur because of a “format error” that is reported in the output of the show ip traffic EXEC
command.
Conditions: This symptom is observed when NetFlow is enabled on an interface of a 1-port Gigabit
Ethernet line card that is installed in a Cisco 12000 series Internet router that is running Cisco IOS
Release 12.0(16)S or Release 12.0(22)S.
Workaround: Although the condition is triggered by multiple broadcast ARP requests, it only occurs
if NetFlow, input ACLs, and ACL hardware checking are configured. Disabling any of these features
will prevent the condition from occurring. For example, to remove the ACL hardware checking on
the 1-port Gigabit Ethernet line card, enter the no access-list hardware salsa command.
•
CSCdy67945
Symptoms: When the loopback remote line interface configuration command is executed on a
6-port channelized T3 line card, the command may fail and may cause a T1 connection to flap.
Conditions: This symptom is observed on both American National Standards Institute (ANSI) and
Bell Communications Research (Bellcore) loopbacks on networks that are sensitive to T1 framing
errors.
When the loopback remote line configuration command is executed, the line card causes a brief
change of frame alignment (COFA) error. Normally, this error goes unnoticed. However, some
devices react to these errors with an alarm indication signal (AIS). Each time the loopback request
is initiated (if the T1 connection is configured for remote loopbacks each time the T1 connection
comes up), the AIS brings down the T1 connection.
The actual commands would be as follows:
t1 1 loopback remote line fdl ansi
t1 1 loopback remote line fdl bellcore
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2065
Resolved Caveats—Cisco IOS Release 12.0(22)S4
•
CSCdy87260
Symptoms: The configuration synchronization on a standby Route Processor (RP) may fail if the
break signal is sent twice.
Conditions: This symptom is observed on a Cisco 12000 series that has dual RPs and that has the
Route Processor Redundancy Plus (RPR+) feature enabled. This symptom occurs only if the user
sends the break signal twice on the standby RP.
Workaround: There is no workaround.
•
CSCdz12745
Symptoms: When a Cisco 12000 series Engine 2 Packet-over-SONET (POS) line card collects
statistics for locally assigned Multiple Protocol Label Switching (MPLS) label entries, it may lose
the outgoing label entries for the associated prefixes. All the prefixes show up as untagged, and it
may be difficult or impossible to reach the prefixes.
Conditions: This symptom is observed on a Cisco 12000 series Engine 2 POS line card.
Workaround: To recover from the situation, reset the line card.
•
CSCdz16897
Symptoms: The Path Remote Defect Indication (PRDI) may not be handled properly during an
Automatic Protection Switching (APS) switchover. This situation does not affect service.
Conditions: This symptom is observed on a Cisco 10000 series OC-12 ATM line card when an APS
switchover occurs because of poor line quality.
Workaround: There is no workaround.
•
CSCdz18497
Symptoms: A router may loop indefinitely when a Simple Network Management Protocol (SNMP)
walk is performed against certain objects. (Examples of these objects are ifDescr, ifMTU, and
ifInOctets.) The SNMP walk will not cycle if a specific interface is specified, such as ifDescr.1.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)S2. This symptom occurs only in a situation where Multilink Frame
Relay (MFR) interfaces are configured.
Workaround: Reload the router.
•
CSCdz19320
Symptoms: A Cisco 12000 series Engine 4 plus line card may reload after a forced switchover.
Conditions: This symptom is observed when Stateful Switchover (SSO) is configured and the line
card is switching multicast traffic.
Workaround: There is no workaround.
•
CSCdz22591
Symptoms: Resource Reservation Protocol (RSVP) hello may incorrectly declare lost
communications with a neighbor, and fast reroute may be triggered.
Conditions: This symptom is observed when RSVP is configured on a Packet over SONET (POS)
interface with a hello interval of 60 milliseconds or less on a Cisco router that is running Cisco IOS
Release 12.0(24)S. This symptom does not exist when hello is configured on an Ethernet interface.
Workaround: Configure hello intervals longer than 60 milliseconds.
•
CSCdz25228
Symptoms: An Engine 2 (E2) line card may reload after it reboots.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2066
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S4
Conditions: This symptom is observed on the E2 line card of a Cisco 12000 series Internet router
that is running the gsr-p-mz image of Cisco IOS Release 12.0(23)S. The E2 line card is configured
with 128 line access control list (ACLs), Virtual Private Network (VPN), and has Frame Relay
configured on one of the interfaces.
Workaround: There is no workaround.
•
CSCdz32724
A line card that is facing the core of a Multiprotocol Label Switching (MPLS) Virtual Private
Network (VPN) may generate packet switch application-specific integrated circuit (ASIC) (PSA)
error messages and may stop sending traffic to the core of the network. The following output may
be observed when the show interface gigabit ethernet interface EXEC command is entered.
%LC-3-PSAERRS: PSA PSA_CPU_GS_INT error 4
%LC-3-PSAERR: PSA error: if_err 0 adr FC00002C c md 5 data 0 pipe 0,fs 0,prep 0 (pc
1EC),pop 0 (pc 19F),plu 0,tlu 0,plu sdram 0 a dr 0 synd 0 check 4D00,tlu sdram 0 adr
0 synd 0 check 0,ssdram 0 adr 0,gather 0, pl 1822D92,plmuxcnts 61, pludefpsr 22000,
plupsr 22000, pludsr 0
Conditions: These symptoms are observed on a Cisco 12000 series 3-port Gigabit Ethernet line card
when the line card flaps.
Workaround: There is no workaround.
•
CSCdz32988
Symptoms: The CPU on a Cisco 7500 series Versatile Interface Processor (VIP) or on a Cisco 12000
series line card may persistently show very high utilization (99 percent) reported against the “TAG
Stats Background” process, as is displayed in the output of the show processes cpu EXEC
command:
CPU utilization for five seconds: 100%/1%; one minute: 99%; five minutes: 99% PID
Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process 53 31226460 603427 51748 98.39%
98.60% 97.08% 0 TAG Stats Backgr
This situation does not directly impact the router operation because the “TAG Stats Background”
process is a low priority process. However, the show mpls forwarding-table EXEC command does
not provide accurate counters when this situation occurs.
Conditions: This symptom, which is a rare race condition, may occur when parallel paths are
configured.
Workaround: Enter the no tag ip aggregate hidden command on the route processor. Note that doing
so will prevent the counters of the show mpls forwarding-table EXEC command from being
updated.
To restore normal VIP or line card operation, reload microcode onto the affected VIP or line card.
•
CSCdz36445
Symptoms: Traffic does not resume after a Cisco 12000 series Internet router has reloaded.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is running Cisco
IOS Release 12.0(24)S in an IP version 6 (IPv6) environment and that is configured with Engine 3
line cards.
Workaround: There is no workaround.
•
CSCdz37228
Symptoms: Memory fragmentation may occur on Cisco routers with the MAC accounting feature
enabled.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2067
Resolved Caveats—Cisco IOS Release 12.0(22)S4
Conditions: This symptom may be observed on Cisco 12000 series Internet routers with the MAC
accounting feature enabled that are under DOS attack.
Workaround: Disable the MAC accounting feature.
•
CSCdz37875
Symptoms: Traceback messages may be displayed in the log file of a router.
Conditions: This symptom is observed on the OC-3 Packet over SONET (POS) line card of a Cisco
10000 series that is running Cisco IOS Release 12.0(22)S.
Workaround: There is no workaround.
•
CSCdz42976
Symptoms: Open Shortest Path First (OSPF) or Intermediate System-to-Intermediate System
(IS-IS) protocol adjacencies may be incomplete.
Conditions: This symptom is observed on a Cisco router after it is loaded with Cisco IOS Release
12.0(21)ST5. This symptom may affect connectivity across Engine 2 (E2) interfaces.
Workaround: There is no workaround.
•
CSCdz46604
Symptoms: Multilink adjacencies may show up as invalid.
Conditions: This symptom is observed on the Engine 3 (E3) Quad OC-12 line card of a Cisco 12000
series Internet router that is running Cisco IOS Release 12.0 (21)S3. It may not be possible to clear
this symptom by entering the clear cef linecard EXEC command or by reloading the microcode on
the line card.
Workaround: There is no workaround.
•
CSCdz47189
Symptoms: An Engine 3 (E3) 4-port OC-12 (4xOC-12) or Engine 3 OC-48 Packet over SONET
(POS) line card may reload and generate traceback messages.
Conditions: This symptom is observed when the gsr-p-mz image of Cisco IOS Release 12.0(24)S is
loaded on a Cisco 12406 router in an Autonomous System Multiprotocol Label Switching (MPLS)
Virtual Private Network (VPN) of an IP version 4 (IPv4) Border Gateway Protocol (BGP) label
distribution environment. TheE3 4xOC-12 line card may be operating either in the channelized
mode or the POS mode.
Workaround: No workaround is necessary as the line cards will recover without user intervention.
•
CSCdz48235
Symptoms: A Cisco 12000 series Internet router may reload because of a bus error.
Conditions: This symptom is observed on a Cisco 12000 series that has dual Gigabit Route
Processors (GRP) and that is operating in the Route Processor Redundancy (RPR) mode. This
symptom is observed after the Cisco 12000 series is upgraded to Cisco IOS Release 12.0(23)S.
Workaround: There is no workaround.
•
CSCdz49243
Symptoms: Multiprotocol Label Switching (MPLS) traffic engineering (TE) Fast Reroute (FRR)
may lose all tag labels from a line card.
Conditions: This symptom is observed on a Cisco 12000 series Internet router when the primary
tunnel router is reloaded.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2068
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S4
Workaround: Power cycle the Cisco 12000 series Internet router.
Alternate workaround: Reload the line card.
•
CSCdz53850
Symptoms: A standby Route Processor (RP) may reload.
Conditions: This symptom is observed on the standby RP of a dual RP Cisco 12000 series Internet
router when a line card on the Cisco 12000 series or a neighboring router is reloaded. This symptom
occurs when a line card has a large number of encapsulation entries (3000 entries).
Workaround: There is no workaround.
•
CSCdz54539
Symptoms: An Engine 4 plus line card that is installed in a Cisco 12400 series may be reset by the
Route Processor (RP) because of interprocess communication (IPC) failures. The following errors
may be displayed:
%CPUIF-3-NO_MEM: sendreq_freeq is NULL.
%MDS-2-LC_FAILED_IPC_ACK: RP failed in getting Ack for IPC message of size 148 to LC
in slot 3 with sequence 58638, error = timeout
%FIB-3-FIBDISABLE: Fatal error, slot 3: IPC Failure: timeout
%GRP-4-RSTSLOT: Resetting the card in the slot: 3,Event:
EV_AUTO_LC_RELOAD_ON_FIBDISABLE ]
Conditions: These symptoms are observed when route flapping occurs; route flapping may generate
a high volume of IPC traffic.
Workaround: There is no workaround.
•
CSCdz55944
Symptoms: Switch fabric cards (SFCs) may fail on a Cisco 12410 router.
Conditions: This symptom is observed when there is an upgrade to a Cisco IOS release.
Workaround: There is no workaround.
•
CSCdz55995
Symptoms: When a parity error occurs on an Engine 4/4P line card, the packet and byte counters
may not be accurate.
Conditions: This symptom is observed on a Cisco 12000 series Internet router.
Workaround: There is no workaround.
•
CSCdz56792
Symptoms: A Cisco 12000 series 4-port OC-12 ATM line card that is configured for the Carrier
Supporting Carrier (CSC) feature may reset or report an error.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(22)S3 and that is functioning as a customer carrier customer edge (CE)
router. This symptom occurs after entering the no mpls ip global configuration command followed
by the mpls ip global configuration command.
Workaround: There is no workaround.
•
CSCdz57007
Symptoms: When NetFlow is enabled after configuring distributed switching, and traffic passes, a
Versatile Interface Processor (VIP) may reload.
Conditions: This symptom is observed on a Cisco 7500 series router that functions in a
Multiprotocol Label Switching Virtual Private Network (MPLS VPN) environment.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2069
Resolved Caveats—Cisco IOS Release 12.0(22)S4
Workaround: There is no workaround.
•
CSCdz60229
Symptoms: Cisco devices which run IOS software and contain support for the Secure Shell (SSH)
server are vulnerable to a Denial of Service (DoS) if the SSH server is enabled on the device. A
malformed SSH packet directed at the affected device can cause a reload of the device. No
authentication is necessary for the packet to be received by the affected device. The SSH server in
Cisco IOS is disabled by default.
Conditions: This symptom is observed on all Cisco devices running IOS and containing support for
the Secure Shell (SSH) server.
Workaround: Cisco will be making free software available to correct the problem as soon as
possible.
The malformed packets can be generated using the SSHredder test suite from Rapid7, Inc.
Workarounds are available. The Cisco PSIRT is not aware of any malicious exploitation of this
vulnerability.
This advisory is available at http://www.cisco.com/warp/public/707/ssh-packet-suite-vuln.shtml.
•
CSCdz69362
Symptoms: The tag forwarding counter may no longer function when parity errors occur on an
Engine 4 plus (E4+)line card.
Conditions: This symptom is observed on a Cisco 12000 series Internet router.
Workaround: There is no workaround.
•
CSCdz71662
Symptoms: A router may fail because of a bus error.
Conditions: This symptom is observed if the show environment all EXEC command or the show
environment internals EXEC command is entered while an online insertion and removal (OIR)
procedure is in process.
Workaround: Do not enter the show environment all EXEC command or the show environment
internals EXEC command while an OIR is in progress.
•
CSCdz73799
Symptoms: A traceback condition exists on an Engine 2 (E2) line card of a Cisco 12000 series
Internet router with VPN Routing and Forwarding (VRF) configured on a regular Frame Relay (FR)
packet-over-SONET (POS) interface.
Conditions: This symptom is observed on the E2 line card of a Cisco 12000 series Internet router
that is running the gsr-p-mz image of Cisco IOS Release 12.0(21)ST5. With VRF configured on the
same interface, traceback starts to show. It also becomes impossible to ping on this interface, and
injecting traffic to this interface (FR sub VRF) causes a permanent pause.
Workaround: There is no workaround.
•
CSCdz74588
Symptoms: Traffic on a load-sharing path may be switched to the wrong destination or dropped
altogether.
Conditions: This symptom is observed when a Cisco 12000 series Engine 4 (E4) line card is on the
ingress side, there is a load-sharing path or multiple paths on the egress side, and a hidden class of
service (CoS) global configuration command is configured on the router.
Workaround: Remove the extra load-sharing paths, and make it one single outgoing path.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2070
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S4
•
CSCdz74925
Symptoms: A 4-port OC-48 Packet-over-SONET (POS) Engine 4 plus (E4+) line card may stop
forwarding traffic after you have reloaded microcode onto the line card.
Conditions: This symptom is observed on a Cisco 12000 series that is running the gsr-p-mz image
of Cisco IOS Release 12.0(24)S and that is functioning as a provider edge (PE) router in a carrier
supporting carrier configuration when the 4-port OC-48 POS E4+ line card interconnects the Cisco
12000 series and a customer edge (CE) router.
Workaround: Enter the clear ip bgp privileged EXEC command on the Cisco 12000 series.
•
CSCdz85922
Symptoms: A Cisco 7500 series router or a Cisco 12000 Internet series router could experience a
reload of either the Versatile Interface Processor (VIP) or the line card with the following message:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout, process = TFIB Stats Background
Conditions: Cisco IOS releases with the fix for the caveat CSCdz32988 may show these symptoms.
These symptoms affect only platforms that perform distributed Multiprotocol Label Switching
(MPLS) forwarding. Cisco IOS releases that may contain this symptom include 12.0(21)S,
12.0(22)S, 12.0(23)S, 12.1 and its derivatives and 12.2 mainline. Cisco IOS releases 12.2 T and the
latest 12.0 S software are not susceptible to this symptom.
Workaround: Disable the stats aggregation using the no tag aggregate hidden command.
•
CSCdz88744
Symptoms: A Gigabit Ethernet Engine 2 (E2) or an Engine 4 plus (E4+) line card may reload when
an online insertion and removal (OIR) of the Clock and Scheduler Card (CSC) is performed.
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS Release
12.0 S.
Workaround: There is no workaround.
•
CSCea00096
Symptoms: Packet throttling is activated because of congestion, even when not configured as shown
by the following error message:
%LC_CX3-4-THROTTLE: Packet throttling activated due to congestion
Conditions: This symptom is observed on a Cisco 12416 router that is configured with 200 Border
Gateway Protocol (BGP) peers containing three 6xCT3 line cards, each configured with an even
distribution of ~1500 frame relay subinterfaces.
Workaround: There is no workaround.
•
CSCea00954
Symptoms: IP Multicast hardware counter memory is not freed on an Engine 4/4Plus line card after
multicast routes are cleared from the routing table.
Conditions: This only occurs when the Engine 4/4Plus line card runs out of mtrie node memory, for
example when the routes in the router are more than the line card can handle.
Workaround: There is no workaround.
•
CSCea01869
Symptoms: If a 3-port Gigabit Ethernet (GE) Engine 2 (E2) line card is configured for dot1q VLAN
operation and an inbound access control list (ACL) is applied to the main interface, the line card will
be paused by the Gigabit Route Processor (GRP), reporting Fabric Unicast timeout errors. Note that
3-port GE E2 line cards do not support per subinterface ACL processing.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2071
Resolved Caveats—Cisco IOS Release 12.0(22)S4
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(24)S or a later release with both normal and extended ACLs. The line card will
continue to pause until the ACL is either removed from the interface configuration or ACL is
removed from the configuration using the no access- list access-list-number global configuration
command.
Workaround: There is no workaround.
•
CSCea04669
Symptoms: When resetting the secondary gigabit route processor (GRP) with the break key on a
Cisco 12000 series dual-RP (route processor) router, the primary GRP pauses, then permanently
pauses on watchdog timeout:
Jan 30 00:11:15.216 PST:
%SYS-2-WATCHDOG: Process aborted on watchdog timeout
process = Fabric ping
Conditions: This symptom occurs regardless of the redundancy mode (Route Processor Redundancy
[RPR], Route Processor Redundancy Plus [RPR+], or Stateful Switchover [SSO]) and may impact
the process of replacing a defective slave GRP hardware.
Workaround: There is no workaround.
•
CSCea04762
Symptoms: Some export packets sent from an Engine 4+ (E4+) line card are not received by the
NetFlow collector.
Conditions: This condition is observed on the E4+ line card when the export packets are exported
out of a traffic engineering (TE) or tag interface and the router is running Cisco IOS Release
12.0(22)S2.
Workaround: Export the packets out of the non-TE or non-tag interface. This means that export
packets must be sent out as IP packets from the E4+ line card.
•
CSCea12157
Symptoms: The following error message may be observed on a line card:
%SLOT n: .... : %LC-3-ERRRECOVER: Corrected a transient error on line card.
This error may be observed even though an actual hardware error has not occurred on the line card.
If a hardware error does occur, it will generate additional error messages to identify the source of
the hardware error in addition to the error message listed above.
Conditions: This symptom may be observed on a Cisco Engine 0 line card when a feature that
requires a micro code change is configured.
Workaround: There is no workaround. Ignore the error message.
•
CSCea16176
Symptoms: On a Cisco 12000 series Internet router line card, the fabric error reporting message is
not being turned on after system startup.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)S6, 12.0(21)ST6, or 12.0(23)S2.
Workaround: Physically remove and insert the backup Clock Scheduler Card (CSC) or any Switch
Fabric Card (SFC). This will re enable the line card error reporting mechanism.
Alternate workaround: Enter the hw-module shutdown EXEC command on the backup CSC or on
any SFC. This will also re enable the line card error reporting mechanism.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2072
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S3
•
CSCea22288
Symptoms: An Engine 3 (E3) line card that connects a provider edge (PE) router and a customer
edge (CE) router, both of which are running the Carrier Supporting Carrier feature with IPV4 BGP
labels, may stop forwarding traffic.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(22)S, that is functioning as a PE router, and that is
running the Carrier Supporting Carrier feature when the microcode is reloaded on one of the
multiple line cards that connects the PE router to a provider (P) router.
Workaround: Traffic will resume after performing a micro reload on the E3 line card.
•
CSCea23437
Symptoms: A standby Route Processor (RP) fails to become active after the “test crash” on an active
RP.
Conditions: This symptom is observed on a Cisco 12000 series Internet router that has two RPs with
Route Processor Redundancy (RPR), RPR+, or Stateful Switchover (SSO) mode.
Workaround: Reload the router.
TCP/IP Host-Mode Services
•
CSCdy57048
Symptoms: TCP transmit packets that are sent from a router in some configurations may be
corrupted. This behavior may cause a TCP session to pause indefinitely in one direction.
Conditions: These symptoms are observed with protocols that use TCP transport (Border Gateway
Protocol [BGP] and Telnet are known to be affected). Configurations that may exhibit these
symptoms include interfaces that are configured with Multiprotocol Label Switching (MPLS) or
Multilink PPP (MLP) encapsulation.
Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(22)S3
Cisco IOS Release 12.0(22)S3 is a rebuild of Cisco IOS Release 12.0(22)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(22)S3 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
•
CSCdv51360
Symptoms A data-link switching (DLSw) peer may be stuck in the “AB_PEND” state and a TCP
session may be stuck in the “SYNSENT” state after an IP outage occurs between two DLSw routers.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(3)T.
Workaround Use the show tcp brief EXEC command to determine the Transmission Control Block
(TCB) of the hung TCP session. Enter the clear tcp tcb address privileged EXEC command to clear
the TCB of the hung TCP session. The DLSw peers will reconnect as long as there is IP connectivity
between the DLSw peers.
•
CSCdw01726
Symptoms A Simple Network Management Protocol version 3 (SNMPv3) user configuration is
changed when a router is reloaded.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2073
Resolved Caveats—Cisco IOS Release 12.0(22)S3
Conditions This symptom is observed when an SNMPv3 user is created using message digest 5
(MD5) authentication by entering the following commands:
Router# snmp group groupy v3 auth
Router# snmp user abcdefghij groupy v3 auth md5 abcdefghij
The engine ID is then changed by entering the following command:
snmp-server engineID local 00000009020000024B0008FE
An SNMP walk is performed by entering the following command, the configuration is saved, and
the router is reloaded.
Router# snmpwalk -v 3 -u abcdefghij -A abcdefghij -a MD5 -l AuthNoPriv device-name
The SNMP walk is successful and the following debug header output is displayed when the debug
snmp EXEC command is entered:
Incoming SNMP packet: v3 packet security model: v3 security level: auth username:
abcdefghij
The router is reloaded and a second SNMP walk is performed by entering the following command:
Router# snmpwalk -v 3 -u abcdefghij -A abcdefghij -a MD5 -l AuthNoPriv device-name
After the second SNMP walk is performed, the command does not generate any output and the
following debug header output is displayed when the debug snmp EXEC command is entered:
Incoming SNMP packet: v3 packet security model: v3 security level: noauth : username:
abcdefghij
Workaround Do not change the default engine identity (ID).
•
CSCdw16580
Symptoms On a router that is configured as a provider edge (PE) router with multiple Virtual Private
Network (VPN) routing/forwarding (VRF) instances, the VRF routing table may not be imported to
the same PE router when routes are imported between the VRFs even when the PE router is
displayed on the Border Gateway Protocol (BGP) VPN4 table.
Conditions This symptom is observed on a PE router in a Multiprotocol Label Switching (MPLS)
and VPN environment.
Workaround There is no workaround.
•
CSCdx32611
Symptoms After you detach an interface from a Virtual Private Network (VPN) routing/forwarding
(VRF) instance using the no ip vrf forwarding vrf-name command, the adjacency information that
is associated with the removed interface still shows up in the VRF table.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdx73857
Symptoms A router may fail to warn you that a policy map oversubscribes link bandwidth.
Conditions This symptom is observed when you use nested policies on Frame Relay or Gigabit
Ethernet interfaces and the sum of the shape rate of all permanent virtual circuits (PVCs) or VLANs
is greater than the interface bandwidth of the Frame Relay or Gigabit Ethernet interfaces.
Workaround Enter the show policy-map interface EXEC command to ensure that the policy map
is successfully applied.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2074
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S3
•
CSCdx87577
Symptoms Memory allocation failures occur on a Cisco router that has authentication, authorization,
and accounting (AAA) configured, and “%SYS-2- MALLOCFAIL” messages are displayed. When
you enter the show memory summary command, the command output shows that many small
blocks are used by the AAA processes.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(15)S3.
Workaround There is no workaround.
•
CSCdx87818
Symptoms The following error message may be displayed on a router when a Cisco IOS software
upgrade is performed:
%SYS-6-STACKLOW: Stack for process ATM PA Helper running low, 0/3000
Conditions This symptom is observed on a Cisco 7500 series router when you upgrade from
Cisco IOS Release 12.0(7)T to Release 12.1(14).
Workaround There is no workaround.
•
CSCdx94479
Symptoms The convergence time after four Stateful Switchovers (SSOs) on a Cisco 10000 series
edge services router is 11 seconds but should never be longer than 10 seconds.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdy02248
Symptoms A standby Route Processor (RP) may reload.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(22.1)S when a microcode reload occurs after Border Gateway Protocol
(BGP) peers come up accompanied by high CPU utilization.
Workaround There is no workaround.
•
CSCdy27414
Symptoms An interface of a Cisco 10000 series channelized T3 (CT3) line card may not dequeue
packets. When the link on a CT3 card flaps, one or more interfaces may not recover. The output
queue of the interface may become full with PPP/High-Level Data Link Control (HDLC) packets
and may stay in the “Up/Down” state.
Conditions These symptoms are observed when a chip of a third-party vendor on a Cisco 10000
series CT3 line card is defective.
Workaround There is no workaround; return the CT3 line card for repair.
The fix for this caveat adds a software procedure that periodically checks if the pointers that link the
partial packet buffer RAM blocks are becoming corrupted. When a corrupted pointer is detected, the
associated interface is removed and then replaced, which may cause the interface to be incapable of
transmitting traffic for up to 10 seconds. When this condition is detected and repaired, a message is
logged to the Route Processor and the line card log to notify the user.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2075
Resolved Caveats—Cisco IOS Release 12.0(22)S3
•
CSCdy34113
Symptoms A Cisco 7500 series router may reload at a packet enqueue utility.
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(22)S when all of the following conditions are met:
– A Frame Relay (FR) link is configured on a Versatile Interface Processor (VIP) interface.
– Frame Relay Traffic Shaping (FRTS) is enabled for FR circuits via the map-class frame-relay
global configuration command, and distributed traffic shaping is not enabled on the Route
Switch Processor (RSP).
– You deencapsulate the interface by using the no encapsulation frame-relay interface
configuration command, and you unconfigure the interface by entering the no map-class
frame-relay global configuration command.
– While you unconfigure FRTS, FR encapsulation occurs, and the traffic load is still high so that
the shaping function is activated and outbound packets on per-virtual circuit (VC) queues are
throttled.
Workaround Avoid the situation in which all of the above-mentioned conditions take place
concurrently. For example, when an FR link is configured on a VIP interface and you require traffic
shaping, use distributed FRTS, or unconfigure FRTS while user traffic is low so as not to activate
the shaping function.
•
CSCdy38681
Symptoms A 1-port ATM Enhanced OC12/STM4 port adapter (PA-A3-OC12) that is configured
with multiple Low Latency Queueing (LLQ) streams that are running near peak cell rate (PCR) may
drop packets. The output of the show interfaces command displays that packets are sent out but no
packets are coming in. Input or output packet drops are not displayed.
Conditions This symptom is observed during a test on a Cisco 7500 series router that is running
Cisco IOS Release 12.0(22)S.
Temporary Workaround Enter the clear interface type number EXEC command each time the
symptom occurs.
•
CSCdy43435
Symptoms Virtual Private Network routing/forwarding (VRF) does not function properly on a
Frame Relay link between a provider edge (PE) router and a customer edge (CE) router, and the CE
router cannot ping the PE router.
Conditions These symptoms are observed on a Frame Relay link between a Cisco 10000 series
router that is functioning as a PE router and another Cisco 10000 series router that is functioning as
a CE router.
Workaround Reload the PE router to make the link between the PE router and the CE router
function.
•
CSCdy47631
Symptoms Virtual Private Network version 4 (VPNv4) packet switch ASIC (PSA) traffic may be
punted to a line card, which causes a CPU spike and Interior Gateway Protocol (IGP) instability.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2076
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S3
Conditions This symptom is observed in a Multiprotocol Label Switching (MPLS) VPN in which a
Cisco 12000 series router is configured as a provider edge (PE) router, a Gigabit Ethernet link
connects the customer edge (CE) router to the PE router, and the PE to provider (P) link is an Engine
2 line card. The following is also observed on the PE-P line card:
– For traffic that is destined for an IP address for which the Cisco Express Forwarding (CEF)
adjacency is an Ethernet MAC address and the Address Resolution Protocol (ARP) cache is
either empty or “incomplete” for the destination, IP address traffic is punted to the ingress line
card CPU, which tries to resolve the adjacency or drops the traffic.
– Line card CPU utilization has been observed to spike to 99 percent when the MAC address is
“incomplete” and traffic is being received for the IP address. This situation may cause IGP
neighbors to be lost and cause fabric unicast timeouts, which may cause the line card to fail.
This symptom occurs when a traffic stream that is destined to a prefix that is either directly
connected or resolved via an IP address has an incomplete MAC address.
This caveat addresses the IGP instability. For more information about this symptom, see
CSCdy31765.
Workaround There is no workaround.
•
CSCdy51151
Symptoms When a Cisco 12000 series Engine 3 line card receives a tag packet with an IP version 4
(IPv4) packet that has options underneath it or with a non-IPv4 packet such as an IP version 6 (IPv6)
packet, the packet may be send to the line card CPU for processing.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)ST2.
Workaround There is no workaround.
•
CSCdy51498
Symptoms A 1-port ATM Enhanced OC12/STM4 port adapter (PA-A3-OC12) that is configured
with multiple Low Latency Queueing (LLQ) streams that are running near peak cell rate (PCR) may
drop packets. The output of the show interfaces command displays that packets are sent out but that
no packets are coming in. Input or output packet drops are not displayed.
Conditions This symptom is observed during a test on a Cisco 7500 series router that is running
Cisco IOS Release 12.0(22)S.
Temporary Workaround Enter the clear interface type number EXEC command each time the
symptom occurs.
•
CSCdy55441
Symptoms If a 128-line input access control list (ACL) is configured on an Engine 2 Quad OC-12
line card that has interfaces configured for Virtual Private Network (VPN) and one subinterface for
Frame Relay, the line card may reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22)S.
Workaround There is no workaround.
•
CSCdy68292
Symptoms The following error messages may be generated on a Cisco 12000 series Engine 4 plus
(E4+) OC-192 line card:
SLOT 6: %RX192-3-HINTR: status = 0x4000000, mask = 0x7EFFFF FF - Parity error on
rx_pbc_mem.
-Traceback= 4039CEF0 4044ECEC 400C85B0
SLOT 6: %SYS-2-INTSCHED: ’sleep for’ at level 7
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2077
Resolved Caveats—Cisco IOS Release 12.0(22)S3
-Process= "CEF IPC Background", ipl= 7, pid= 52
-Traceback= 400CABB8 400B9D24 403F5EB0 4044E040 400CEAE4 400C7108
SLOT 6: %SYS-2-INTSCHED: ’sleep for’ at level 7
-Process= "CEF IPC Background", ipl= 7, pid= 52
-Traceback= 400CABB8 400B9D24 403F5EB0 4044E040 400CEAE4 400C7108
Cisco Express Forwarding (CEF) on the E4+ OC-192 line card may become disabled, and the
associated port stays in an “Up/Up” state.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-k4p-mz
image of Cisco IOS Release 12.0(21)S3 or the gsr-p-mz image of Cisco IOS Release 12.0(21)ST2.
Workaround Enter the microcode reload slot-number global configuration command on the E4+
OC-192 line card.
•
CSCdy75434
Symptoms A line card in a provider edge (PE) router that is running IP version 6 (IPv6) in a
Multiprotocol Label Switching (MPLS) environment (also referred to as a 6PE router) or in any
connected router may reload because of a fabric ping failure, and the following error message may
be generated:
%FIB-3-FIBDISABLE: Fatal error, slot 1: IPC Failure: timeout
%GRP-3-COREDUMP: Core dump incident on slot 1, error: Fabric ping failure (seq:3279)
%GRP-4-RSTSLOT: Resetting the card in the slot: 1,Event:
EV_LC_E4_CORE_DUMP_DECLINE_DUP
Conditions This symptom is observed on a Cisco 12000 series router that functions as a 6PE router
or on any connected router when an IPv6 default route is removed from another 6PE router and
traffic is flowing through the IPv6 default route while the route update following the route removal
is being processed. When the IPv6 default route is removed, one or more line cards may reload on
any router that receives the route update.
Workaround There is no workaround.
•
CSCdy78371
Symptoms An Engine 2 Quad OC-12 line card that has interfaces configured for Virtual Private
Network (VPN) and that has a Frame Relay subinterface may reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22.4)S1 when a microcode bundle is configured and loaded onto
the Engine 2 Quad OC-12 line card.
Workaround There is no workaround.
•
CSCdy78808
Symptoms An Engine 2 line card may generate “QM-4-STUCK” messages and may stop forwarding
traffic.
Conditions This symptom is observed on a Cisco 12000 series router when an adjacent router is
booted up.
Workaround Reload microcode onto the Engine 2 line card.
•
CSCdy78970
Symptoms A Cisco 12000 series Engine 2 line card may generate the following error messages:
SLOT 14: %LCPOS-3-SOP: TX:BadLenCtr. Source=0x1 (Plim), halt_minor0=0x8001 (1000 0000
0000 00sl, s/l=TooShort/long)
SLOT 14: %GSR-3-INTPROC: Process Traceback= 400CCE60 400C90F0 40010A24
-Traceback= 4033F424 4044ED54 400C88B0
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2078
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S3
Conditions This symptom is observed when you remove and reinsert switch fabric on a Cisco 12000
series router while traffic is flowing.
Workaround There is no workaround.
•
CSCdy80690
Symptoms A traceback may occur on a Cisco 10000 series router during a postrouter check.
Conditions This symptom is observed during a test of a 1-port channelized OC-12 line card when
data is sent across an Add-Drop Multiplexor (ADM).
Workaround There is no workaround.
•
CSCdy81098
Symptoms A Cisco router may reload when a Multiprotocol Label Switching traffic engineering
(MPLS TE) tunnel interface changes to the “Up” state.
Conditions This symptom is observed when load-balanced Interior Gateway Protocol (IGP) paths
are configured.
Workaround There is no workaround.
•
CSCdy81738
Symptoms The routes in a Cisco Express Forwarding (CEF) table may be mismatched between the
Gigabit Route Processor (GRP) and the line cards. You can clear the mismatch by entering the clear
cef linecard EXEC command, but if the routes are relearned, the situation will reoccur.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(21)S4 or Release 12.0(22)S when an access control list (ACL) is
configured to deny Simple Network Management Protocol (SNMP) packets.
Workaround Disable the ACL that denies the SNMP packets.
Alternate Workaround Run Cisco IOS Release 12.0(21)S3.
•
CSCdy86210
Symptoms NetFLow stops functioning after an online insertion and removal (OIR) of a switch fabric
card (SFC).
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround Disable and reenable the ip route-cache flow sampled interface configuration
command.
•
CSCdy89001
Symptoms An Engine 4 Packet-over-SONET (POS) line card reloads.
Conditions This symptom is observed on an Engine 4 Packet-over-SONET (POS) line card in a
Cisco 12000 series Internet router during several online insertion and removal (OIR) procedures on
a Clock Scheduler Card (CSC).
Workaround There is no workaround.
•
CSCdy89663
Symptoms A Cisco 12000 series router may reload when an interface flaps.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S during multicast traffic.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2079
Resolved Caveats—Cisco IOS Release 12.0(22)S3
•
CSCdz00085
Symptoms A Cisco router that is functioning as a provider edge (PE) router may install an outgoing
point of presence (POP) label instead of an outgoing aggregate label for a connected Virtual Private
Network (VPN) routing/forwarding (VRF) route.
Conditions This symptom is observed in a carrier supporting carriers topology with a Cisco router
that is running Cisco IOS Release 12.2(12.10)T1 and that is functioning as a PE router.
Temporary Workaround Enter the shutdown interface configuration command followed by the no
shutdown interface configuration on the VRF interface until the symptom occurs again.
Alternate Temporary Workaround Reload the router. However, after having done so, when you enter
the shutdown interface configuration command followed by the no shutdown interface
configuration on the VRF interface the symptom will occur again.
•
CSCdz06149
Symptoms When an input access control list (ACL) is configured and the ip unreachables interface
configuration command is enabled (which is enabled by default) on an interface, a low rate of packet
leakage occurs for those packets that are dropped by the ACL. The rate is the same or less than the
expected rate of Internet Control Message Protocol (ICMP) unreachable packets that are sent back
to the source. The leak occurs only for IP packets (without the IP Header [L3] option) that have a
size that is smaller than 56 bytes.
Conditions This symptom is observed in Cisco IOS Release 12.0 S on a Cisco 12000 series 4-port
OC-48c/STM-16c Packet-over-SONET Enhanced Services line card and on a Cisco 12000 series
1-port OC-192c/STM-64 Packet-over-SONET Enhanced Services line card.
This symptom does not occur in Cisco IOS Release 12.0 ST.
Workaround Enter the no ip unreachables interface configuration command on the interface to
prevent the packet leakage. However, in this situation, ICMP unreachable packets are not sent back
to the source when packets are dropped by the ACL.
•
CSCdz06300
Symptoms The IP Source Tracker feature unexpectedly stops functioning on a line card, and packets
for the source-tracked destination are not forwarded because the IP Source Tracker feature is stuck
in the throttling mode.
Conditions This symptom is observed on a Cisco 12000 series Engine 2 line card. To determine if
the line card is in the above-mentioned condition, enable the debug lc hw-throttle hidden
command; if the following message recurs every two seconds—even when there is low CPU
utilization—the IP Source Tracker feature is stuck in the throttling mode:
SLOT 0: GLC_HW: Disabled HW DOS throttling (CPU at 0%, sched skew: -1%)
Workaround Reload the line card.
•
CSCdz07032
Symptoms When you add a new Performance Routing Engine (PRE) to a Cisco 10000 series router,
the startup configuration may not be copied to the new PRE. Verify that the configuration exists by
entering the dir sec-nvram: EXEC command or the dir standby-nvram: EXEC command,
depending on the Cisco IOS software image that you are running.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Cut over to the new PRE, and save the configuration.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2080
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S3
•
CSCdz07354
Symptoms Enhanced Interior Gateway Routing Protocol (EIGRP) resets the routing table when you
enter the write memory EXEC command, write terminal EXEC command, or show
running-config privileged EXEC command.
Conditions This symptom is observed on a Cisco 7505, Cisco 7507, and Cisco 7513 router.
Workaround There is no workaround.
•
CSCdz07393
Symptoms When you apply a combination of IP version 6 (IPv6), an access control list (ACL), and
Sampled NetFlow to an interface on an Engine 4 plus line card, the line card may reload.
Conditions This symptom is observed while IPv6 traffic is flowing.
Workaround There is no workaround.
•
CSCdz07976
Symptoms An Engine 2 line card may reload continuously.
Conditions This symptom is observed on a Cisco 12000 series router when a router that is adjacent
to the Cisco 12000 series router is rebooted while Border Gateway Protocol (BGP) policy
accounting is configured on the Engine 2 line card and traffic is flowing through the line card.
Workaround There is no workaround. When this situation occurs, stop the traffic that is flowing
through the Engine 2 line card until Cisco Express Forwarding (CEF) is loaded onto the line card.
•
CSCdz08851
Symptoms Resource Reservation Protocol (RSVP) Hello detection may not trigger a Fast Reroute
(FRR) switchover.
Conditions This symptom is observed when you use RSVP Hello detection to enable Multiprotocol
Label Switching traffic engineering (MPLS TE) FRR protection on shared interfaces.
Workaround There is no workaround.
•
CSCdz10165
Symptoms A Tag Forwarding Information Base (TFIB) entry for a Virtual Private Network (VPN)
routing and forwarding (VRF) static recursive route that is configured for multihop Border Gateway
Protocol (BGP) may be lost.
Conditions This symptom is observed after the egress interface flaps.
Workaround There is no workaround.
•
CSCdz14924
Symptoms When the customer edge (CE) peer of a provider edge (PE) router has the neighbor
default-originate router configuration command enabled, which enables the PE router to send the
default route to the CE, the default route may be sent with the wrong mask (255). When this situation
occurs, the CE router sends a notification that states that an illegal network entry has occurred and
flaps the session.
Conditions This symptom is observed on a Cisco 7200 series router that functions as a PE router but
may also occur on another platform that functions as a PE router.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2081
Resolved Caveats—Cisco IOS Release 12.0(22)S3
•
CSCdz19881
Symptoms An input access control list (ACL) may not take effect.
Conditions This symptom is observed on a Cisco 12000 series Engine 4 plus interface on which the
VRF Selection feature is enabled.
Workaround There is no workaround.
•
CSCdz20079
Symptoms Configuring the hw-module slot shutdown global configuration command in the startup
configuration may cause a router to reload.
Conditions This symptom is observed on a Cisco 10000 series router when you attempt to boot from
an eboot image.
Workaround Do not configure the hw-module slot shutdown global configuration command in the
startup configuration.
Alternate Workaround Change the configuration register to “0x40” to ignore the configuration during
the bootup process.
•
CSCdz21375
Symptoms A memory leak may occur on a line card.
Conditions This symptom is observed on the line card of a Cisco 12000 series after NetFlow is
disabled on the last interface of a line card that has NetFlow enabled. This symptom is observed
while there are more than 1900 flow records in the NetFlow cache of the line card.
Workaround Keep NetFlow enabled on at least one interface on the line card.
•
CSCdz23286
Symptoms A Cisco 12000 series router may reload during the bootup process.
Conditions This symptom is observed when you attempt to boot up the Cisco 12000 series router
with an image of Cisco IOS Release 12.0(23)S and occurs before the image is loaded onto the router.
Workaround There is no workaround.
•
CSCdz25339
Symptoms An unusually formatted Multicast Source Discovery Protocol (MSDP) packet may cause
memory corruption and a router to reload.
Conditions This symptom is observed on a Cisco router when it has a peer relationship with a
specific third-party vendor router that is running a recent software release.
Workaround Shut down the peer relationship by entering the ip msdp shutdown peer-address
global configuration command.
•
CSCdz29044
Symptoms An Engine 3 line card that connects a provider edge (PE) router and a customer edge
router, both of which are running the Carrier Supporting Carrier feature, may reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(23)S, that is functioning as a PE router, and that is running the
Carrier Supporting Carrier feature when you reload microcode on one of multiple line cards that
connects the PE router to a provider (P) router.
Note that the symptom occurs on an Engine 3 line card that connects the PE router and the CE router,
but the microcode is reloaded onto another line card that connects the PE router and the P router.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2082
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S3
•
CSCdz31682
Symptoms Packet drops may occur in the Cisco Express Forwarding (CEF) and distributed Cisco
Express Forwarding (dCEF) paths after a router has been reloaded and a ping is sent (through the
router) to the IP address of a directly-connected customer edge (CE) router.
Conditions This symptom is observed on a Cisco 7500 series router. The CE router in this
configuration is connected to a Fast Ethernet Virtual Private Network (VPN) routing/forwarding
(VRF) dot1q subinterface on a PE router that has the mpls netflow egress interface configuration
command enabled.
Workaround On the PE router, manually ping the IP address of the directly-connected CE router and
enable the relevant Address Resolution Protocol (ARP) entries to be populated.
First Alternate Workaround Disable the mpls netflow egress interface configuration command on the
subinterface.
Second Alternate Workaround Add a static ARP entry for the VRF subinterface by entering the arp
vrf ip mask mac arpa global configuration command.
Third Alternate Workaround Enter the clear arp privileged EXEC command on the destination CE
router.
•
CSCdz31778
Symptoms Slow path forwarding on an Engine 3 line card of a provider edge (PE) router that is
running IP version 6 (IPv6) in a Multiprotocol Label Switching (MPLS) environment (also referred
to as a 6PE router) may not function.
Conditions This symptom is observed on a Cisco 12000 series router that is functioning as a 6PE
router and occurs because the 6PE disposition does not function for aggregate 6PE labels on the
Engine 3 line card.
Workaround There is no workaround.
•
CSCdz35426
Symptoms A primary Route Processor (RP) and a standby RP may not load the correct image when
a Cisco 12000 series router is reloaded.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S2 or an earlier release when all of the following conditions are present:
– An Advanced Technology Attachment (ATA) disk or a Flash card such as a Personal Computer
Memory Card International Association (PCMCIA) card is installed in both the primary RP and
the standby RP.
– The Route Processor Redundancy (RPR) mode is enabled.
– The boot system tftp ip-address global configuration command is enabled in the configuration.
The symptom does not occur when the Route Processor Redundancy plus (RPR+) mode or the
Stateful Switchover (SSO) feature is enabled.
Workaround Use the RPR+ mode or the SSO feature.
Alternate Workaround for Cisco IOS Release 12.0(22)S2 only After the RPs have booted up, remove the
boot system tftp ip-address global configuration command from the configuration and execute the
upgrade rom-monitor EXEC command to enable the ROM monitor to be upgraded.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2083
Resolved Caveats—Cisco IOS Release 12.0(22)S3
•
CSCdz35853
Symptoms When a SONET link is not stable, the following error messages may be generated on a
1-port OC-48 Port Packet-over-SONET (POS)/Synchronous Digital Hierarchy (SDH) IP Services
Engine (ISE) line card:
SLOT 1: %EE48-3-GULF_RX_MOFIFO: Overflow detected. Corrective action taken.
SLOT 1: %EE48-3-GULF_RX_BYTE_TO_WORD: Out of synchronization, bitmap= 0xE. Corrective
action taken.
Conditions This symptom is observed under rare circumstances on a Cisco 12000 series router that
is running Cisco IOS Release 12.0(22)S2.
Workaround Reload the line card.
•
CSCdz37224
Symptoms “Alpha” error messages may be observed on the ingress or egress interface of a
Cisco 12000 series 4-port OC-12c/STM-4c Packet over SONET (POS) synchronous digital
hierarchy IP services engine line card. The following messages may be displayed on the egress
interface of the Cisco 12000 series 4-port OC-12c/STM-4c POS synchronous digital hierarchy IP
services engine line card:
%EE48-3-ALPHAERRS: TX ALPHA: ALPHA_CPU_PIPELINE_CTRL_INT error 1 SLOT 2:
%EE48-3-ALPHAPAIR: TX ALPHA: POP PAIR
Conditions This symptom is observed if the shape, bandwidth, random detect, or priority value is
configured and if both the set ip-dscp-value quality of service (QoS) policy map configuration
command and the set mpls experimental policy map configuration command are disabled. This
symptom is observed on a Cisco 12016 router that is running the gsr-p-mz image of Cisco IOS
Release 12.0(21)S or Release 12.0(21)ST2a.
Workaround Remove the transmit (TX) service policy and use Per Interface Rate Control (PIRC)
instead.
Additional Notes The same symptom may occur when an error recovery is performed for hardware
failures such as data path parity errors. The symptom under those circumstances would be a failed
recovery. There is no workaround for the occurrence of this symptom when an error recovery is
performed.
•
CSCdz39560
Symptoms Multiprotocol Label Switching (MPLS) Fast Reroute (FRR) may not function properly
on an Engine 2 ingress line card.
Conditions This symptom is observed on a Cisco 12000 series router when a tunnel that is protected
by FRR is a one-hop tunnel to a second router. A third router that is connected to the first and second
router provides the backup path. When the primary path between the first and second router goes
down, traffic is not redirected over the backup path.
Workaround There is no workaround.
•
CSCdz50959
Symptoms The mechanism that checks the packet length may fail and cause the number of “ignore”
errors to increase on an interface that is associated with an E1 controller on a 24-port channelized
E1/T1 line card.
Conditions This symptom is observed on a Cisco 10000 series router when the interface is connected
to a remote device that is configured to send packets that are larger than 8000 bytes or that
erroneously sends packets that are larger than 8000 bytes.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2084
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S2
•
CSCuk36939
Symptoms Cisco IOS software fails to set up the Gigabit Ethernet Interface Processor (GEIP) MIBs
correctly on a Cisco 7500 series router.
Conditions This symptom is observed when the hierarchy on the GEIP is incorrect; the port adapter
and interface are shown at the same level as the GEIP. The GEIP should be at the top of the hierarchy,
followed by the port adapter, followed by the interface.
Workaround There is no workaround.
•
CSCuk39337
Symptoms Virtual Private Network routing/forwarding (VRF) does not function properly on a
Frame Relay link between a provider edge (PE) router and a customer edge (CE) router, and the CE
router cannot ping the PE router.
Conditions These symptoms are observed on a Frame Relay link between a Cisco 10000 series
router that is functioning as a PE router and another Cisco 10000 series router that is functioning as
a CE router.
Workaround Reload the PE router to make the link between the PE router and the CE router
function.
Resolved Caveats—Cisco IOS Release 12.0(22)S2
Cisco IOS Release 12.0(22)S2 is a rebuild of Cisco IOS Release 12.0(22)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(22)S2 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
•
CSCdu00328
Symptoms A Cisco 7500 series router may stop receiving packets on certain interfaces when a Cisco
6500 series switch that is connected through a port channel is reloaded.
Conditions This symptom is observed on a Cisco 7500 router that is connected to a Cisco 6500 series
switch through the port channel. This symptom does not occur if the port channel is removed.
Workaround Run normal IP between the Cisco 7500 series router and the Cisco 6500 series switch
without the port channel configuration.
•
CSCdu43164
Symptoms A memory leak may occur on a Cisco 7200 series router. The memory leak is caused by
the Border Gateway Protocol (BGP) I/O process and occurs at the rate of 100 KB to 130 KB per
hour (about 2.5 MB to 3 MB per day) after the show memory summary | incl BGP privileged
EXEC command is entered. This situation occurs regardless of whether a BGP neighbor is flapping.
The output of the show processes memory | incl bgp privileged EXEC command shows the
following:
Router# show processes memory | incl bgp
PID TTY Allocated Freed Holding Getbufs Retbufs Process ... 104 0 3522569548
2139398320 21965976 297916 5184 BGP I/O ...
The show memory summary | incl bgp privileged EXEC command indicates that the “BGP (1)
update” function allocates memory without deallocating it again after the process is completed:
Router# show memory summary | incl bgp
Alloc PC Size Blocks Bytes What ... 0x607C42E0 65496 333 21810168 BGP (1) update ....
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2085
Resolved Caveats—Cisco IOS Release 12.0(22)S2
Conditions This symptom is observed on a Cisco 7206VXR router that is functioning as a Provider
Edge (PE) router and that is running Cisco IOS Release 12.1(5a) in a Multiprotocol Label Switching
Virtual Private Network (MPLS VPN) network.
Workaround Reload the router.
•
CSCdv49909
Symptoms Parallel links may not be used efficiently on a Cisco router when Multiprotocol Label
Switching (MPLS) traffic is load balanced over parallel links to a customer premises equipment
(CPE) device.
Conditions This symptom is observed when a Virtual Private Network (VPN) routing/forwarding
(VRF) static route to a remote loopback interface is configured and both parallel links to the same
CPE device are configured to the same loopback interface without an IP address using the ip
unnumbered interface configuration command.
Possible Workaround Define the following configurations on the provider edge (PE) and customer
edge (CE) routers to achieve load balancing with static VRF routes.
PE Configuration
interface multilink250
ip vrf forwarding YELLOWVPN
ip address 10.0.0.1 255.255.255.0
interface multilink251
ip vrf forwarding YELLOWVPN
ip address 10.1.0.1 255.255.255.0
The links in the CE configuration must be configured with 10.0.0.2 and 10.1.0.2.
10.10.0.1/32 is the CE loopback and must be advertised to the PE via Routing Information Protocol
(RIP) or with another router protocol. A static route may be used.
CE Configuration
ip route vrf YELLOWVPN 10.10.0.1 255.255.255.255 10.0.0.2
ip route vrf YELLOWVPN 10.10.0.1 255.255.255.255 10.1.0.2
The following output defines static routes for the CE prefix:
ip route vrf YELLOWVPN 192.168.200.0 255.255.255 0 10.10.0.1
•
CSCdx46207
Symptoms A ciscoEnvMonRedundantSupplyNotification trap is not generated when a power supply
is shut down, and a notification message is not displayed on a Cisco 12000 series router.
Conditions This symptom is observed in Cisco IOS Release 12.0(21)S2 on a Cisco 12008 router and
a Cisco 12012 router.
Workaround There is no workaround.
•
CSCdx87998
Symptoms Fast Reroute (FRR) does not fully deconfigure.
Conditions This symptom is observed when the mpls traffic-eng signaling forwarding sync
command is enabled.
Workaround Do not use FRR when the mpls traffic-eng signaling forwarding sync command is
enabled.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2086
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S2
•
CSCdx92027
Symptoms A Route Switch Processor 8 (RSP8) pauses indefinitely.
Conditions This symptom is observed when you enter the ip cef global configuration on a
Cisco 7500 series router that is running Cisco IOS 12.1(12c)E.
Workaround There is no workaround.
•
CSCdx94730
Symptoms An IronBus error occurs on a Cisco 10000 series 1-port channelized OC-12 line card.
The console log shows the following information:
%C10KEVENTMGR-1-IRONBUS_FAULT: Ironbus Event 2/1, Restarting Ironbus
%IPCGRP-3-SYSCALL: System call for command 203 (slot2/0): ipc_send_rpc_blocked failed
(Cause: timeout)
-Traceback= 603C4208 603C4698 603C53E8 6013BFC0 60089C64 600248D4 60024C4C 6035270C
603526F8 %IPCOIR-3-TIMEOUT: Timeout waiting for a response from slot 2/0.
%IPCOIR-2-CARD_UP_DOWN: Card in slot 2/0 is down. Notifying 1choc12-1 driver.
%C10K_ALARM-6-INFO: ASSERT CRITICAL slot 2 Card Stopped Responding OIR Alarm
%IPCOIR-5-CARD_DETECTED: Card type 1choc12-1 (0x1BB) in slot 2/0
%IPCOIR-5-CARD_LOADING: Loading card in slot 2/0
%C10K-5-LC_NOTICE: Slot[2/0] 1choc12-1 Image Downloaded...Booting...
%PXF_DMA-3-IRONBUS_NOTRUNNING: Data path to slot 2/1 failed to synchronize (TIB Not
Running)
Conditions This symptom is observed on a Cisco 10000 series edge services router when you copy
a configuration for creating 768 DS0 interfaces under a Virtual Tributary (VT) on the 1-port
channelized OC-12 line card onto the running configuration.
Workaround Limit the number of DS0 interfaces to 575 or fewer.
•
CSCdy04735
Symptoms The standby Performance Routing Engine (PRE)-1 or Gigabit Route Processor (GRP)
continuously reloads after the hw-module reset command is entered.
Conditions This symptom is observed on a Cisco 12000 series Internet router or Cisco 10000 series
edge services router during an upgrade to Cisco IOS Release 12.0(22.4)S from Cisco IOS
Release 12.0(22)S using the Fast Software Upgrade (FSU) procedure.
Workaround Install the new software image and reload the router without using the dual processor
FSU capability.
•
CSCdy10293
Symptoms A Versatile Interface Processor (VIP) on a Cisco 7500 series router may run out of
memory and generate the following memory allocation (MALLOC) failure messages:
%SYS-2-MALLOCFAIL: Memory allocation of 65556 bytes failed from 0x6010EB8C, alignment
32 Pool: Processor Free: 173756 Cause: Memory fragmentation Alternate Pool: None Free:
0 Cause: No Alternate pool
-Process= "CEF IPC Background", ipl= 0, pid= 31
The show process memory section in the output of the show tech EXEC command indicates that the
Multiprotocol Label Switching (MPLS) Cisco Express Forwarding (CEF) interprocess
communication (IPC) background process is holding up a large portion of the memory.
Conditions This symptom is observed on the VIP of a Cisco 7500 series router.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2087
Resolved Caveats—Cisco IOS Release 12.0(22)S2
•
CSCdy17735
Symptoms A single headend rewrite that is used by all prefixes that are routed over a tunnel is not
updated properly when the label switched path tunnel state changes and there are no prefixes being
routed over the tunnel.
In addition, the output of the show mpls traffic-eng fast-reroute database command inaccurately
represents the entries that are contained within the Fast Reroute (FRR) database. Prefix information
is not applicable to the headend tunnel rewrite and should be displayed separately. The output of the
show mpls traffic-eng fast-reroute database command does not show any tunnel data, but, as long
as the headend tunnel is up, there should always be one entry for the headend tunnel.
Conditions These symptoms are observed when FRR protection is enabled on a tunnel, there are no
prefixes being routed over this tunnel, and Label Distribution Protocol (LDP) is not enabled.
Workaround There is no workaround.
•
CSCdy22453
Symptoms Traffic may be dropped for up to 1 minute on a Multiprotocol Label Switching (MPLS)
traffic engineering (TE) tunnel when the tunnel reoptimizes for a PPP link.
Conditions This symptom is observed only when the MPLS TE tunnel is reoptimizing for a PPP link
that was brought up with Label Distribution Protocol (LDP) enabled.
Workaround Disable LDP or configure High-Level Data Link Control (HDLC).
•
CSCdy27220
Symptoms A ciscoEnvMonRedundantSupplyNotification trap is not generated when a power supply
is shut down, and a notification message is not displayed on a Cisco 12000 series Internet router.
Conditions This symptom is observed on the following Cisco 12000 series routers that run
Cisco IOS Release 12.0(21)S3:
– Cisco 12016 router
– Cisco 12404 router
– Cisco 12406 router
– Cisco 12410 router
– Cisco 12416 router
Workaround There is no workaround.
•
CSCdy27294
Symptoms Virtual Routing and Forwarding (VRF) route aggregation under Border Gateway
Protocol (BGP) fails causing a loss of end-to-end connectivity between Provider Edge routers if
more specific routes are not installed in the BGP VRF table.
Conditions This symptom is observed on a Cisco 12000 series Internet router under the following
conditions:
– The router is deployed as a Provider Edge (PE) router and has Engine 2 line cards that are
running Multiprotocol Label Switching (MPLS) Virtual Private networks (VPNs).
– Route aggregation is used in BGP IPv4 VRF address family and more specific routes are
suppressed.
– Multiple Customer Edge (CE) routers are connected to a 3-port Gigabit Ethernet line card.
Workaround Ensure that the more specific routes are imported into the BGP VRF table by
configuring redistribution or network statements.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2088
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S2
•
CSCdy29545
Symptoms Packets that are traversing an Engine 4 plus (E4+) OC-192 line card in a Cisco 12000
series router that has tag switching enabled may be dropped.
Conditions This symptom is observed in a traffic engineering (TE) configuration and occurs when
traffic is load balancing across multiple TE tunnels at the headend or when label imposition is
performed over multiple paths.
Workaround Enter the clear ip route network mask command on the ingress side of the OC-192 link.
Use caution because entering the clear ip route * command may invoke the symptoms.
•
CSCdy29983
Symptoms Border Gateway Protocol (BGP) policy accounting counters on a 3-port Gigabit Ethernet
line card increment incorrectly.
The output of the show cef interface type number statistics EXEC command displays that the
average rate of index 1 through 3 is about 200 to 300 Mbps while the actual traffic is about 400 kbps.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy30484
Symptoms An Engine 2 3-port Gigabit Ethernet line card that receives a tag packet with a Time to
Live (TTL) value of 1 may reload.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy31765
Symptoms The following symptoms may be observed on a Cisco 12000 series Engine 2 (E2) ingress
line card that is installed in a provider edge (PE) router.
When traffic is destined for an IP address for which the Cisco Express Forwarding (CEF) adjacency
is an Ethernet MAC address and the Address Resolution Protocol (ARP) cache is either empty or
incomplete, traffic is punted to the CPU of the line card. The CPU attempts to resolve the adjacency
and drops the traffic.
While the ARP cache for the Ethernet MAC address is incomplete but traffic is being received for
the IP address, the CPU utilization of the line card may increase to 99 percent. This situation may
lead to a loss of Interior Gateway Protocol (IGP) neighbors and fabric-unicast ping timeouts, which
in turn may cause the line card to reload.
When the CEF adjacency moves from an incomplete state to a MAC address, buffer management
application-specific integrated circuit (ASIC) (BMA) errors are triggered and packet switch ASIC
(PSA) pipeline stall messages may be displayed:
%LC-3-BMAERRS: ToFab BMA BMA error status error 10
%QM-3-ERROR: ToFab Register 0x40007.
-Traceback= 403F0074 4036DBF4 40498814 400CCF98
%LC-3-BMAERRS: ToFab BMA QM error 1
Conditions These symptoms are observed in a Multiprotocol Label Switching Virtual Private
Network (MPLS VPN) in which a Cisco 12000 series router that is functioning as a PE router is
connected to a provider (P) router through an E2 line card and the connection between the PE router
and the customer edge (CE) router is a Gigabit Ethernet link.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2089
Resolved Caveats—Cisco IOS Release 12.0(22)S2
Workaround The following sequence of commands will prevent the loss of IGP neighbors and
fabric-unicast ping timeouts:
a. Enter the attach slot-number privileged EXEC command for the E2 line card.
b. Enter the enable EXEC command.
c. Enter the configure terminal privileged EXEC command.
d. Enter the controller hw-throttle privileged EXEC (hidden) command.
This sequence of commands will not prevent BMA errors and PSA pipeline stall messages, but will
prevent the IGP neighbors from being lost and the line card from reloading. Note that these
commands will no longer be enabled if the line card or router reloads.
•
CSCdy34017
Symptoms An access control list (ACL) with an Internet Control Message Protocol (ICMP) entry
may be incorrectly processed by (the packet switch ASIC [PSA] of) an Engine 2 line card.
Conditions This symptom is observed on a Cisco 12000 series Engine line card when an ACL entry
matches an ICMP packet that is specifying its type but not its code.
Workaround Specify the code in all ICMP entries.
•
CSCdy35263
Symptoms A Cisco 12000 series 4-port ATM line card repeatedly reloads after you have performed
a microcode reload.
Conditions This symptom is observed on a Cisco 12000 series router that is running the gsr-p-mz
image of Cisco IOS Release 12.0(22)S, and with the carrier supporting carrier feature configured on
the 4-port ATM line card.
Workaround There is no workaround.
•
CSCdy38827
Symptoms A Cisco router may install a suboptimal Intermediate System-to-Intermediate System
(IS-IS) route into its routing table. Depending on the topology, this situation may create a routing
loop.
Conditions This symptom is observed on an IS-IS Level 1 - Level 2 (L1L2) router that is running
Cisco IOS Release 12.0 S or Release 12.0 ST and that has prefixes configured that are allowed to be
leaked into Level 1, that is, prefixes that match the access list that is specified within the
redistribute isis ip level-2 into level-1 distribute-list command. When route leaking is not
configured, this condition is not observed.
Workaround There is no workaround. The condition resolves itself when the affected route is cleared
by entering the clear ip route network EXEC command.
•
CSCdy43671
Symptoms An Engine 0 ATM line card may reload.
Conditions This symptom is observed under rare circumstances when a Cisco 12000 series router is
booted up with Cisco IOS Release 12.0(21)ST3.
Workaround There is no workaround.
•
CSCdy44251
Symptoms The Forwarding Information Base (FIB) table on a Cisco 12000 series Gigabit Route
Processor (GRP) may be missing entries for directly connected subnets.
Conditions This symptom is observed on a Cisco 12000 series router after you have removed a large
number of routes.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2090
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S2
Workaround Enter the clear ip route network for the affected prefixes. The following is an example:
Router# show ip cef 10.2.0.4 255.255.255.224
%Prefix not found
Router# clear ip route 10.2.0.4 255.255.255.224
Router# show ip cef 10.2.0.4 255.255.255.224
10.2.0.4/30, version 285154, epoch 0, attached, connected, cached adjacency to POS1/0
0 packets, 0 bytes via POS1/0, 0 dependencies valid cached adjacency
•
CSCdy44790
Symptoms When using Multiprotocol Label Switching traffic engineering (MPLS TE) Fast ReRoute
(FRR), an FRR label switched path (LSP) tunnel may go down after being rerouted over the backup
tunnel.
Conditions This symptom is observed when the point of local repair is running an interim build of
Cisco IOS Release 12.0(24)S and the merge point (MP) is running an interim build of Cisco IOS
Release 12.0(23)S. The symptom occurs because the MP does not properly reflect the Logical
Interface Handle (LIH) that it receives in the “Path” message. When the LIH changes after initial
establishment of the LSP tunnel, it returns a corresponding “Resv” message (that is, corresponding
to the “Path” message). This “Resv” message does not properly reflect the LIH. The only condition
under which the LIH changes after establishment of the LSP tunnel is when fast rerouting is enabled
on the LSP tunnel.
Workaround There is no workaround.
•
CSCdy47173
Symptoms A Route Processor (RP) may reload when you install a Flash card in slot 1 of the RP.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy48075
Symptoms If an active Performance Routing Engine (PRE) fails before a standby PRP is fully
configured, the standby PRP may not perform a switchover correctly.
Conditions This symptom is observed on a Cisco 10000 series router in a redundant configuration.
Workaround Do not force a switchover until the standby PRP is fully initialized. If the active PRP
fails and the standby PRP does not switchover correctly, reload the standby PRP.
•
CSCdy51197
Symptoms Fast Reroute (FRR) may fail to trigger if the cause of the failure is registered in the Route
Processor (RP) when the link state is already down.
Conditions This symptom may be observed when triggers are delayed, for example when the
pos delay triggers interface configuration command is enabled.
Workaround Disable the pos delay triggers interface configuration command.
•
CSCdy51434
Symptoms A router may reload unexpectedly if MD5 authentication is used with Open Shortest Path
First (OSPF). The following message may be displayed when you enter the show version EXEC
command:
System returned to ROM by error - a Software forced crash, PC 0x12345678
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(22)S. The symptom occurs only when corrupted OSPF packets are present.
Workaround Remove MD5 authentication for OSPF.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2091
Resolved Caveats—Cisco IOS Release 12.0(22)S2
•
CSCdy63771
Symptoms Virtual Private Network (VPN) routing/forwarding (VRF) may not function on a
High-Speed Serial Interface (HSSI) port adapter.
Conditions This symptom is observed on a Cisco 7500 series router
Workaround Remove and reconfigure the affected subinterface on the HSSI port adapter.
•
CSCdy66571
Symptoms The shadow state on a standby router processor (RP) remains down after you enter the
shutdown interface configuration command followed by the no shutdown interface configuration
command on the router interfaces.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with two RPs
when the Stateful Switchover (SSO) feature is enabled.
Workaround There is no workaround.
•
CSCdy68938
Symptoms A Resource Reservation Protocol (RSVP) message containing a MESSAGE_ID object
(as described in RFC 2961) is received multiple times.
Conditions This symptom is observed when a router that is running a version of Cisco IOS software
that does not support RSVP Refresh Overhead Reduction Extensions (RFC 2961) receives the RSVP
message that contains a MESSAGE_ID object. The router fails to send a PathErr or ResvErr reply
in response, causing the neighboring router to retransmit the RSVP (PathErr or ResvErr) message
multiple times. The retransmissions can have a negative affect on Multiprotocol Label Switching
traffic engineering (MPLS TE) tunnel scalability, convergence, or both convergence and scalability.
Workaround There is no workaround.
•
CSCdy71240
Symptoms A Parallel Express Forwarding (PXF) network processor reloads when traffic is destined
for a Multiprotocol Label Switching traffic engineering (MPLS TE) tunnel.
Conditions This symptom is observed in a configuration in which two Cisco 10000 series routers are
connected back-to-back via an MPLS TE tunnel, when you ping the MPLS TE tunnel from a remote
end.
Workaround There is no workaround.
•
CSCdy73102
Symptoms When a primary Multiprotocol Label Switching traffic engineering (MPLS TE) tunnel
reoptimizes over another link, a traffic drop may occur.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S1 following a Fast Reroute (FRR) operation.
Workaround Configure the primary label switched path tunnel (LSP tunnel) as an explicit tunnel.
•
CSCdy74457
Symptoms The forwarding of IP version 6 (IPv6) packets from a Cisco 12000 series Engine 3 line
card to a Cisco 12000 series Engine 0 line card does not function for certain directly connected hops.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22)S or Release 12.0(22)S1.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2092
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdy75485
Symptoms All Layer 2 management packets are dropped, which causes all interfaces that depend
upon keepalives to transition to the down state.
Conditions This symptom is observed on a Cisco 10000 series router in a configuration with a large
numbers of interfaces.
Workaround There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(22)S1
Cisco IOS Release 12.0(22)S1 is a rebuild release for Cisco IOS Release 12.0(22)S. The caveats in this
section are resolved in Cisco IOS Release 12.0(22)S1 but may be open in previous Cisco IOS releases.
•
CSCdu72708
Symptoms The ip address negotiated interface configuration command must be applied to the
configuration of an interface before any other PPP commands.
Conditions This symptom is observed when the on-demand address pool (ODAP) on-board
Dynamic Host Configuration Protocol (DHCP) server is used.
Workaround There is no workaround.
•
CSCdv39804
Symptoms A bus error may occur on a router, and the following message may be displayed:
%ALIGN-1-FATAL: Illegal access to a low address, addr=0x1A8, pc=xxxxxxxx,
ra=xxxxxxxx, sp=xxxxxxxx
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0 S.
Workaround There is no workaround.
•
CSCdw41164
Symptoms A Versatile Interface Processor (VIP) may reload because of an error at the
ct3sw_check_tx process.
Conditions This symptom is observed on a Cisco 7000 series VIP that is running Cisco IOS
Release 12.0(16)S4.
Workaround There is no workaround.
•
CSCdx09745
Symptoms A Cisco 7200 series router that is using Cisco Express Forwarding (CEF) switching may
reload after you enter the show queue interface-name interface-number privileged EXEC command
for a serial interface.
The output of the show ip interface EXEC command is very similar to the following message and
indicates that the normal CEF switching vector is used:
IP CEF switching is enabled
IP Fast switching turbo vector
IP Normal CEF switching turbo vector
Conditions This symptom is observed on a Cisco 7200 series router when CEF switching is used and
there are packets in the queue when you enter the show queue interface-name interface-number
privileged EXEC command.
Workaround On any of the serial interfaces that has weighted fair queueing (WFQ) enabled, enter
the following sequence of commands (note that in this example, interface “serial 4/1” is used):
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2093
Resolved Caveats—Cisco IOS Release 12.0(22)S1
Router(config)# interface s4/1
Router(config-if)# no fair-queue
Router(config-if)# fair-queue
This sequence of commands will set the correct switching vector as follows:
IP CEF switching is enabled
IP Fast switching turbo vector
IP Feature CEF switching turbo vector
This workaround must be applied each time the router reloads.
•
CSCdx45151
Symptoms The Cisco Express Forwarding (CEF) table of a Cisco 12000 series Engine 0
Packet-over-SONNET (POS) line card gets almost completely cleared and then builds up again.
Conditions This symptom is observed after a Stateful Switchover (SSO) on an Engine 0 POS line
card that is configured with 110,000 routes and about 600 interfaces. After the protocol has
converged, all the entries of the old epoch are purged and the entries of the new epoch take over.
Workaround There is no workaround.
•
CSCdx63504
Symptoms After a Cisco IOS software upgrade, redistribution may stop functioning on a router.
Conditions This symptom is observed on a router that is configured with Border Gateway Protocol
(BGP).
Workaround Remove and reconfigure the BGP configuration, or reboot the router.
•
CSCdx68619
Symptoms NetFlow aggregation does not function.
Conditions This symptom is observed in Cisco IOS Release 12.0 S and Release 12.0 ST when either
only the mpls netflow egress interface configuration command is configured on an interface or both
the ip route-cache flow and mpls netflow egress interface configuration commands are configured
on the same interface or on different interfaces, but the NetFlow cache is allocated through the mpls
netflow egress interface configuration command.
Workaround There is no workaround.
•
CSCdx69785
Symptoms A Cisco 12000 series Engine 2 OC-48 Packet-over-SONET line card that is configured
as a generic routing encapsulation (GRE) tunnel-server card enters an error state and reports the
following error message:
QM-4-STUCK: Port 0 Queue mask 0x1
The line card should recover from this error state but fails to do so.
Conditions These symptoms are observed when the line card is overloaded with tunnel traffic.
Workaround There is no workaround. To recover from the error state, perform a microcode reload
of the line card.
•
CSCdx71829
Symptoms When you delete a subinterface from a router, the reserved bandwidth may not be
returned, decreasing the total bandwidth of the interface under which the subinterface is configured.
Conditions This symptom is observed when the subinterface has bandwidth reserved because of a
service policy shape command.
Workaround Remove the service policy before you delete the subinterface.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2094
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdx80124
Symptoms Gigabit Route Processor (GRP) and GRP-B temperatures are incorrectly reported as NA.
Conditions This symptom is observed when the show environment [temperatures] privileged
EXEC command is running on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx82485
Symptoms Under rare circumstances, a router that is configured with Protocol-Independent
Multicast (PIM) may pause indefinitely.
Conditions This symptom is observed when an interface that has PIM enabled is shut down. This
symptom may also occur when other configuration operations are performed on a PIM-enabled
interface. This symptom affects only port adapters such as the 8-port 10BASE-T Ethernet port
adapter (PA-8E) and the 8-port 10BASE-T Ethernet port adapter (PA-4E) that are using a particular
third-party vendor chip.
Workaround Use a different Ethernet card, or avoid using PIM.
•
CSCdx85342
Symptoms A Route Processor (RP) may boot up with the boot helper image instead of the regular
image, or a Cisco 12000 series line card that is configured under the primary RP may reset because
of interprocess communications (IPC) failures and generate the following error message:
* UTC: %FIB-3-FIBDISABLE: Fatal error, slot 0: IPC Failure: timeout
The two above mentioned symptoms are mutually exclusive.
Conditions These symptoms are observed on a Cisco 12000 series router when the router is
configured with a primary RP and a standby RP and you load the gsr-boot-mz image from Bootflash
using the boot system tftp global configuration command.
The symptoms affect only the gsr-boot-mz image (the gsr-p-mz image is not affected) and may occur
in the following Cisco IOS releases:
– 12.0(20.3)S
– 12.0(20.3)S1
– 12.0(20.3)ST
– 12.0(20.3)ST1
– 12.0(20.3)ST2
– 12.0(20.3)ST3
– 12.0(20.4)S
– 12.0(20.4)S1
– 12.0(20.4)S2
– 12.0(20.4)ST
– 12.0(20.4)ST1
– 12.0(20)ST
– 12.0(20)ST1
– 12.0(20)ST2
– 12.0(20)ST3
– 12.0(20)ST4
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2095
Resolved Caveats—Cisco IOS Release 12.0(22)S1
– 12.0(20)ST5
– 12.0(21.1)S
– 12.0(21.1)S1
– 12.0(21.1)S2
– 12.0(21.1)S3
– 12.0(21.2)S
– 12.0(21.3)S
– 12.0(21.3)S1
– 12.0(21.3)S2
– 12.0(21.3)S3
– 12.0(21.4)S
– 12.0(21.4)S2
– 12.0(21.4)S3
– 12.0(21)S
– 12.0(21)S1
– 12.0(21)S2
– 12.0(21)S3
– 12.0(21)S4
– 12.0(21)ST
– 12.0(21)ST1
– 12.0(21)ST2
– 12.0(21)ST3
– 12.0(21)ST4
– 12.0(22)S
– 12.0(22.1)S
Workaround Use a gsr-boot-mz boot image that was released earlier than Release 12.0(20.3)S or
later than Release 12.0(22.1)S.
•
CSCdx86830
Symptoms An end-to-end ping fails between a local customer edge (CE) router and a remote CE
router if the local CE router is connected to a provider edge (PE) router. This PE router is connected
to another CE router that runs the Carrier Supporting Carrier feature. The network path includes
several other routers and eventually leads to the remote CE router.
Conditions This symptom is observed in an internal Border Gateway Protocol (iBGP) IPv4 label
distribution environment at the local CE router when there are three labels in the label stack of the
PE router.
Workaround Enter the neighbor next-hop-self router configuration command on the CE router that
runs the Carrier Supporting Carrier feature to configure this CE router as the next hop for the PE
router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2096
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdx87434
Symptoms Large packet losses occur when a Stateful Switchover (SSO) Nonstop Forwarding (NSF)
switchover occurs.
Conditions This symptom is observed on a Cisco 7500 series router that is configured with Versatile
Interface Processors (VIPs) and is caused by an improper configuration of distributed Cisco Express
Forwarding (dCEF) and weighted fair queueing (WFQ).
Workaround Follow these steps:
a. Verify what type of queueing is configured on a VIP interface by entering the show interfaces
privileged EXEC command and verifying the “Queueing Strategy” field.
b. If the “Queueing Strategy” field indicates WFQ, change the field value to VIP-based WFQ by
entering the fair-queue interface configuration command on the VIP interface.
•
CSCdx89425
Symptoms When a line card reloads while multicast traffic is being sent to its ingress interface, the
line card may reload again.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx89548
Symptoms An interface on a Cisco 7500 series channelized T3 port adapter cannot ping a directly
connected interface because of adjacency difficulties.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the interface on the channelized T3 port adapter.
•
CSCdx93291
Symptoms The Cisco 10000 series edge services router does not support the OperStatus and
presence indicator for the fan and power modules: the ciscoEnvMonFanStatusTable and the
ciscoEnvMonSupplyStatusTable in the CISCO-ENVMON-MIB are not supported.
Conditions This symptom is observed in Cisco IOS Release 12.0(21)S and later releases.
Workaround There is no workaround.
•
CSCdy00245
Symptoms A Cisco 7500 series Packet-over-SONET (POS) port adapter that is installed in a
Versatile Interface Processor (VIP) reloads at vip_ip_fib_fs_tag.
Conditions This symptom is observed when a Cisco 7500 series router that serves as a Multiprotocol
Label Switching Traffic Engineering (MPLS-TE) tunnel head with Fast Reroute (FRR) enabled
performs a Stateful Switchover (SSO) while traffic is entering through the POS port adapter.
Workaround There is no workaround.
•
CSCdy01211
Symptoms A Multilink Frame Relay interface is rejected by the parser during bootup.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2097
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdy01271
Symptoms A Cisco 12000 series 6-port channelized T3 (6CT3-SMB) line card reloads when the
encapsulation on a serial interface on the line card is changed from High-Level Data Link control
(HDLC) to Frame Relay.
Conditions This symptom is observed on a Cisco 12000 series Internet router after a Stateful
Switchover (SSO).
Workaround There is no workaround.
•
CSCdy02298
Symptoms A line card may reload.
Conditions This symptom is observed on a Cisco 12000 series Internet router when a policy map is
configured with “priority” in one class, the policy map is attached to an interface of an Engine 4 plus
line card, and “bandwidth percent” is added to another class on the same policy map.
Workaround Do not configure “bandwith percent” on a policy map if the policy map already has
“priority” configured in a class.
•
CSCdy03361
Symptoms Packet drops may occur in the Cisco Express Forwarding (CEF) and distributed Cisco
Express Forwarding (dCEF) paths after a router is reloaded when a ping is sent (through the router)
to the IP address of a directly connected customer edge (CE) router.
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.2(6). The CE router in this setup is connected to a Fast Ethernet Virtual Private Network
(VPN) routing/forwarding (VRF) dot1q subinterface that has the mpls netflow egress interface
configuration command configured.
Workaround The Cisco 7500 series router can ping the IP address of the directly connected CE
router and cause the relevant Address Resolution Protocol (ARP) entries to be populated.
Alternate Workaround A Remove the mpls netflow egress interface configuration command from the
subinterface.
Alternate Workaround B Add a static ARP entry for the VRF subinterface by entering the arp vrf ip
mask mac arpa global configuration command.
Alternate Workaround C Enter the clear arp privileged EXEC command on the destination CE router.
•
CSCdy04472
Symptoms Polling for numbered ATM subinterfaces and unnumbered Frame Relay interfaces does
not return any data. When the ifInNUcastPkts, ifOutNUcastPkts, and ifOutQLen variables are
among the first of multiple objects that are bundled together in an snmpget command, some or all
of these variables return the message “no such variable.”
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(19)S2.
Workaround Retrieve the variables individually or via an snmpwalk command.
•
CSCdy05017
Symptoms An Engine 2 line card may reload.
Conditions This symptom is observed when tag switching is enabled on a Cisco 12000 series
Internet router that has Engine 2 line cards while load balancing is occurring in the Cisco Express
Forwarding (CEF) path.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2098
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdy05963
Symptoms A Cisco 12000 series standby Route Processor (RP) remains disabled in Route Processor
Redundancy Plus (RPR+) or Stateful Switchover (SSO) mode. The standby RP boots up from the
ROM monitor (ROMmon) mode but does not initialize completely.
Conditions This symptom is observed when you use the send break EXEC command to return the
standby RP to the ROMmon prompt, but not when you use the standby reload command for the
same purpose.
Workaround There is no workaround.
•
CSCdy06278
Symptoms Multilink PPP (MLPPP) interfaces are in a “Down/Down” state after a Stateful
Switchover (SSO) occurs.
Conditions This symptom is observed on a Cisco 7500 series router.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the MLPPP interfaces.
•
CSCdy06328
Symptoms The memory usage of a Cisco 12000 series Route Processor (RP) is very high.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(21)S1 and that is configured with an IP Services Engine
(ISE) line card with v8 NetFlow enabled.
Workaround There is no workaround.
•
CSCdy09407
Symptoms During a Stateful Switchover with Nonstop Forwarding (SSO/NSF), transit traffic may
be interrupted for a brief period of time. This condition is temporary, is related to timing, and may
be platform-dependent.
This condition occurs when the following sequence of events occurs:
a. The Open Shortest Path First (OSPF) loopback interface comes up first during the switchover.
b. A router link-state advertisement (LSA) is scheduled for the area associated with the loopback
interface.
c. One or more other OSPF interfaces come up, and neighbors of those interfaces enter a “Full”
state while the router LSA is scheduled.
d. The router LSA is finally generated and flooded to the neighbors that are in a “Full” state.
The end result is that the neighbors that are in a “Full” state cause some OSPF routes to be
temporarily deleted. This condition is most easily observed when there are OSPF neighbors on a
broadcast network segment with designated routers (DRs) and backup designated routers (BDRs).
Conditions This symptom is observed on a Cisco 12000 series router, but could also occur on a
Cisco 7500 series or Cisco 10000 series router.
Workaround Ensure that the loopback interface address is not included in one of the OSPF network
statements under the router ospf global configuration command. If the loopback address needs to
be advertised into the OSPF, it can often be advertised by redistributing connected subnets with a
route map that specifically permits the loopback interface.
•
CSCdy10448
Symptoms Open Shortest Path First (OSPF) does not propagate the routes into a Multiprotocol Label
Switching (MPLS) Virtual Private Network (VPN).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2099
Resolved Caveats—Cisco IOS Release 12.0(22)S1
Conditions This symptom is observed when VPN routing/forwarding (VRF) instances are
configured on the neighboring router.
Workaround There is no workaround.
•
CSCdy10739
Symptoms Disassociating slots without removing ATM virtual circuits (VCs) causes the ATM VCs
to go into an inactive state.
Conditions This symptom is observed when the Automatic Protection System (APS) feature is
enabled and you delete the ATM VCs after the slots are disassociated.
Workaround Delete the ATM VCs before you disassociate the slots.
•
CSCdy11698
Symptoms A Cisco 12000 series imposition line card does not handle the hop limit correctly.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.1)S and that is functioning as a provider edge (PE) router that is running IPv6 in a
Multiprotocol Label Switching (MPLS) environment (also referred to as a 6PE router).
Workaround There is no workaround.
•
CSCdy13708
Symptoms Sampled NetFlow (SNF) may fail to sample the packets that have been denied by an
access control list (ACL).
Conditions This symptom is observed when an ACL and SNF are applied to the same interface on a
Cisco 12000 series Engine 2 line card.
Workaround There is no workaround.
•
CSCdy15862
Symptoms A Gigabit Route Processor (GRP) may reload after a cache parity error occurs on a 1-port
Gigabit Ethernet (GE) or 8-port Fast Ethernet (FE) line card.
Conditions This symptom is observed a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S3 or Release 12.0(22)S and that is configured with an Engine 1 1-port GE or
Engine 1 8-port FE line card.
The GRP will reload only in the rare event that the cache parity error occurs in a CPU cache line
that contains a control packet.
Workaround Deconfigure the Error-Correction Code (ECC) software feature by entering the no
service cerf global configuration command.
For more information, see the document at the following location:
http://www.cisco.com/warp/public/770/fn16911.shtml
•
CSCdy15975
Symptoms A Cisco 10000 series line card sends a “link up state” message before the interprocess
communication (IPC) is established. This situation causes the Cisco IOS software to report the line
card to be down.
Conditions This symptom is observed when you enter the hw-module slot number reset EXEC
command on a Cisco 10000 series router, and a large number (that is, 4000) point-to-point virtual
circuits (VCs) are configured.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2100
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdy17360
Symptoms With Route Processor Redundancy Plus (RPR+) enabled, when you send a break twice
on an active Route Processor (RP), the second synchronization fails. The active RP does not attempt
to reload the standby RP.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.1)S1 in a configuration with 2000 ATM subinterfaces and 200 Border Gateway
Protocol (BGP) peers that are advertising 180,000 BGP routes.
Workaround There is no workaround.
•
CSCdy18324
Symptoms Per-packet load balancing does not function on an interface that is configured with basic
Multiprotocol Label Switching (MPLS).
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S or a later release.
Workaround There is no workaround.
•
CSCdy19736
Symptoms A T3 (DS3) interface on a Cisco 10000 series 8-port E3/T3 line card fails to ping.
Conditions This symptom is observed after a Cisco 10000 series router has reloaded.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the line card.
•
CSCdy19877
Symptoms A Cisco 12000 series Route Processor (RP) may reload because of a Resource
Reservation Protocol (RSVP) database code error.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.2(22)S when you attempt to configure a large number of Multiprotocol Label Switching
Traffic Engineering (MPLS-TE) tunnels and memory allocation (MALLOC) errors occur.
Workaround There is no workaround.
•
CSCdy21552
Symptoms A Cisco 10000 series router may display an incorrect number of channelized OC-12 line
cards in the output of the show version EXEC command. The number of channelized OC-12 line
cards that is reported is usually double the number of the actual number of channelized OC-12 line
cards.
Conditions This symptom is observed on a Cisco 10000 series router that is configured with
channelized OC-12 line cards. The condition is cosmetic and does not affect system operation.
Workaround You can identify the correct number of channelized OC-12 line cards by entering the
show diag summary EXEC command and determining the slots that contain these line cards. For
example, for a line card in slot 5/0, the output of the show diag summary EXEC command will be
as follows:
Slot/Subslot 5/0: 1choc12-1 card, 1 port
•
CSCdy22120
Symptoms The sysUpTime MIB object, which reports the system uptime, periodically returns a
value smaller than the previous value.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2101
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdy22596
Symptoms Interprocessor communication (IPC) timeout flaps may occur on a Cisco 10000 series
line card.
Conditions This symptom is observed on a Cisco 10000 series router that is running Cisco IOS
Release 12.0(21)ST2.
Workaround There is no workaround.
•
CSCdy22725
Symptoms The sustainable cell rate (SCR) value is lost and becomes zero when you reset an
interface under which a permanent virtual connection (PVC) is defined with the old style syntax and
that has variable bit rate (VBR) traffic parameters. The same PVC disappears completely from the
configuration after the router is rebooted.
Conditions These symptoms are observed on a Cisco 7500 series router.
Workaround Use the new style syntax to define the PVC.
•
CSCdy25884
Symptoms You cannot enable Sampled NetFlow and aggregated NetFlow simultaneously. If you
allow a Sampled NetFlow configuration to overwrite an aggregated NetFlow configuration and then
disable Sampled NetFlow, the aggregated NetFlow configuration is still present.
Conditions This symptom is observed on an interface of a Cisco 7500 series router.
Workaround Delete the aggregated NetFlow configuration before you configure Sampled NetFlow.
•
CSCdy27052
Symptoms A Cisco 7500 series router may reload unexpectedly.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdy27126
Symptoms When all eight ports of an 8-port unchannelized E3/T3 line card are in use, memory
corruption may occur, which may cause random router reloads.
Conditions These symptoms are observed on a Cisco 10000 series router.
Workaround Use only seven ports of the line card.
•
CSCdy27385
Symptoms A Cisco 7500 series router may reload because of an arithmetic exception when the
traffic-shape rate bit-rate burst-size excess-burst-size interface configuration command is applied
to a serial interface.
The output of the show version EXEC command includes the following line, in which
“0xXXXXXXXX” is the address at which the router reloads:
System returned to ROM by error - an arithmetic exception, PC 0xXXXXXXXX
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(13)S2 when the bit rate is smaller than 1000. The router may or may not have generic
traffic shaping configured on its interfaces.
Workaround Do not specify a bit rate that is smaller than or equal to 1000, even though the
command-line interface (CLI) accepts it.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2102
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdy27442
Symptoms If a nonaggregated variable bit rate-non-real time (VBR-NRT) permanent virtual circuit
(PVC) is created while the associated link is in a “Down” state and then deleted before the associated
link ever transitions to the “Up” state (that is, the PVC spends its entire life with the associated link
in a “Down” state), the per-link subscribed rate is not properly maintained (that is, the bandwidth is
not returned to the pool). In rare situations, this situation may lead to an inability to create
nonaggregated PVCs.
Conditions This symptom is observed on a Cisco 10000 series router.
Workaround Ensure that the associated link transitions to the “Up” state.
•
CSCdy30557
Symptoms A Cisco 12000 series Engine 2 8-port OC-3 ATM line card reloads when an
inappropriate value for the Modified Deficit Round Robin (MDRR) bandwidth is attached.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy34152
Symptoms The ifDescr MIB object continues to return information for a 24-port channelized E1/T1
line card after the line card is removed and the no card command is entered.
Conditions This symptom is observed on a Cisco 10000 series router.
Workaround Reload the router.
•
CSCdy34581
Symptoms A Cisco 12000 series router may reload because of a memory corruption.
Conditions This symptom is observed during the configuration of traffic shaping.
Workaround There is no workaround.
•
CSCdy34771
Symptoms All subinterfaces of a Cisco 10000 series OC-3 Packet-over-SONET (POS) line card are
shown to be in a “Down/Down” state while the main POS interface is shown to be in an “Up/Down”
state.
Conditions This symptom is observed when you configure the OC-3 POS interface with 100
data-link connection identifiers (DLCIs).
Workaround Saving the configuration and reloading the router will usually force all DLCIs to come
up.
Alternate Workaround Flapping the main POS interface may bring the line protocol up on the main
interface.
•
CSCdy39282
Symptoms A Cisco 12000 series 2-port channelized OC-3/STM-1 to DS1/E1 line card may fail.
Conditions This symptom is observed in a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.3)S.
Workaround There is no workaround.
•
CSCdy39839
Symptoms A router may reload while calculating shortest path routes.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2103
Resolved Caveats—Cisco IOS Release 12.0(22)S1
Conditions This symptom is observed when you configure the metric-style wide global
configuration command to enable Intermediate System-to-Intermediate System (IS-IS) in a
Multiprotocol Label Switching (MPLS) traffic engineering (TE) environment.
Workaround There is no workaround.
•
CSCdy41516
Symptoms When you configure more than 256 Multilink PPP (MLP) interfaces on a Cisco 10000
series channelized T3 line card, the serial interfaces that belong to a bundle may no longer be
accessible.
Conditions This symptom is observed on a Cisco 10000 series router.
Workaround There is no workaround.
•
CSCdy42349
This caveat consists of two symptoms, two conditions, and two workarounds.
Symptoms A A Versatile Interface Processor (VIP) may reload when you enable the mpls netflow
egress interface configuration command on a dot1q interface.
Conditions A This symptom is observed on a VIP that is installed in a Cisco 7500 series router that
has 802.1q trunking and Virtual Private Network (VPN) configured.
Workaround A There is no workaround.
Symptoms B Alignment errors may occur on Multiprotocol Label Switching (MPLS) packets that are
traversing the feature path, such as the packets that encounter a service policy.
Conditions B This symptom is observed on a Cisco 7200 series router that has 802.1q trunking and
Virtual Private Network (VPN) configured.
Workaround A There is no workaround.
•
CSCdy48247
Symptoms When NetFlow is enabled on a Cisco 10000 series router, the Parallel Express
Forwarding (PXF) network processor may reload, and the router may generate one of the following
messages:
PXF DMA FTC Bad Address Error
TOASTER-2-FAULT: T1 XCM0 Address Error: R1
%TOASTER-2-FAULT: T1 SW Exception: CPU[t1r3c1] 0x00000680 at 0x0DFE LR 0x0934
Conditions This symptom is observed on a Cisco 10000 series router that is running Cisco IOS
Release 12.0(20)ST5, Release 12.0(21)ST4, or Release 12.0(22)S, and is more likely to occur when
there have been buffer allocation failures on the PXF network processor.
Workaround Disable NetFlow.
•
CSCdy50225
Symptoms A Cisco 12000 series router may reload when a line card has failed and you perform a
Simple Network Management Protocol (SNMP) query to cpmCPUTotalTable from a network
management station (NMS).
Conditions This symptom is observed under very rare situations.
Workaround When a line card has failed, do not perform an SNMP query to cpmCPUTotalTable
from an NMS.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2104
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S1
•
CSCdy51751
Symptoms A Cisco 10720 router may exchange labels incorrectly and rewrite a MAC header
incorrectly. For example, the router is supposed to rewrite the MAC header with an Ethernet header
but may rewrite the MAC header with a Packet-over-SONET header. The router may also exchange
a label with one that is not consistent with the Multiprotocol Label Switching (MPLS) Tag
Forwarding Information Base (TFIB).
Conditions This symptom is observed on a Cisco 10720 router that functions as an MPLS provider
(P) router, when all of the following conditions are met:
– The router exchanges MPLS labels.
– There are a huge number of labels in the router, for example, thousands of MPLS traffic
engineering (TE) tunnel midpoints.
– A link on which these tunnel midpoints transit flaps several times, which may cause more than
64,000 MAC rewrite indices.
Workaround There is no workaround.
•
CSCdy54707
Symptoms A line card that has the clock source line configuration command enabled by default
nevertheless provides an internal clock signal, but the Cisco IOS software reports that an (external)
line clock signal is provided.
This condition was discovered when pings to a local IP address were occasionally dropped at regular
intervals. If you reset the line card by entering the hw-module slot shelf-id|slot-number reload
EXEC command, the clock signal is set to internal by default.
Conditions This symptom is observed when a Cisco 10000 series 24-port channelized E1/T1 line
card is initialized through a Cisco IOS reload with the clock source line configuration command
enabled by default.
Workaround First explicitly configure the clock source internal configuration command on the line
card and then configure the clock source line configuration command on the line card.
•
CSCuk35531
Symptoms After an application-specific integrated circuit (ASIC) resets or a line card failure occurs,
interfaces may come up, but the Forwarding Information Base (FIB) is disabled, and the following
error message can be generated:
%FIB-3-FIBDISABLE: Fatal error, slot 2: IPC Failure: timeout
Conditions These symptoms are observed on a 2-port channelized OC-3/STM-1 (DS1/E1) line card
or a 6-port channelized T3 line card that is installed in a Cisco 12000 series router that is running
Cisco IOS Release 12.0(21)ST1.
Workaround There is no workaround.
•
CSCuk36805
Symptoms Deleting a traffic engineering (TE) tunnel by entering the no interface tunnel
tunnel-number command may result in memory corruption and eventually may cause a router to
reload.
Conditions This symptom is observed on a Cisco 7200 series or Cisco 12000 series router that is
running Cisco IOS Release 12.0(22)S or Release 12.0(22.1)S and that has TE tunnel interfaces
configured.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2105
Resolved Caveats—Cisco IOS Release 12.0(22)S
Resolved Caveats—Cisco IOS Release 12.0(22)S
All the caveats listed in this section are resolved in Cisco IOS Release 12.0(22)S. This section describes
only severity 1, severity 2, and select severity 3 caveats.
Basic System Services
•
CSCdt67183
Symptoms Wrong NetFlow statistics may occur on all fast interfaces. Byte counter fields may
overflow in 57 seconds at the OC12 line rate and in 15 seconds at the OC48 line rate. These counters
have to be changed to 64 bit for the export of correct NetFlow statistics.
Conditions This symptom is observed on all fast interfaces.
Workaround There is no workaround.
•
CSCdv27333
Symptoms Intermediate System-to-Intermediate System (IS-IS) hellos and PPP keepalives are
treated like nonpriority packets and dropped by Selective Packet Dropping (SPD) in situations of
congestion. In consequence, the router may loose its IS-IS adjacency or the Layer 2 connectivity,
and the effect of SPD may fail.
Conditions This symptom is observed on a Cisco 7500 series router. In theory, such a situation may
occur only if the router is heavily loaded at the process level or if Cisco Express Forwarding (CEF)
is disabled.
Workaround Avoid using SPD if the input queue fills.
•
CSCdw02017
Symptoms An EVENT-MIB set action may not work correctly.
Conditions The Simple Network Management Protocol (SNMP) read-write community string may
not be set correctly. For EVENT-MIB set actions to occur correctly the SNMP read-write
community string must be set in mteEventSetContextName.
Workaround Use mteEventSetContextName for specifying the community name.
•
CSCdw09442
Symptoms The Route Processor Module (RPM) bootflash is corrupted and generates an invalid file
header magic number. The dir command does not work. The Flash memory can be read only after
a squeeze bootflash operation is performed but nothing can be copied onto the Flash memory.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Format and copy files from the disk to recover the Flash memory.
•
CSCdw39619
Symptoms An aggregate NetFlow cache may report a source mask even when the source address is
not routable. The source prefix may show an incorrect mask in the aggregation cache and display a
corresponding incorrect prefix.
Conditions These symptoms are observed on a Cisco 12000 series Internet router. These symptoms
occur because of an inconsistency in the Cisco Express Forwarding (CEF) write default routes for
the line cards and Route Processor (RP).
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2106
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw50718
Symptoms A router may reload because of a memory corruption.
Conditions This symptom is observed when a Simple Network Management Protocol (SNMP) is set
to the snmp-set smonVlanIdStatsTable elem 64-bit counter. The reload happens only when this
counter is set to certain values.
Workaround There is no workaround except to disable SNMP.
•
CSCdx15180
Symptoms The snmp-server host global configuration command may not be accepted on a router.
The snmp-server host global configuration command may also disappear from the configuration
after the router is reloaded.
Conditions This symptom is observed on a Cisco 2600 router that is running Cisco IOS
Release 12.2(6) or Release 12.2(7).
Workaround There is no workaround.
•
CSCdx25972
Symptoms A router may reload.
Conditions This symptom is observed on a Cisco 1000 series edge services router while a
configuration is being loaded from a TFTP server.
Workaround There is no workaround.
•
CSCdx27891
Symptoms A router may indicate a watchdog timeout instead of a parity error.
Conditions This symptom is observed on routers that have a different memory map compared to the
Cisco 7200 router. In the case reported for a Cisco 12000 series Internet router, KuSeg addresses
start at 0x50000000 instead of 0x60000000, which is where they start for a Cisco 7200 router.
Workaround There is no workaround.
•
CSCdx35920
Symptoms Service Assurance Agent (SAA) latency measurements may show unrealistic spikes.
Conditions This symptom is observed when Border Gateway Protocol (BGP) is running on a router.
Workaround Use the Jitter Probe, which requires the Response Time Reporter (RTR) responder to
be running on the remote Cisco router.
•
CSCdx47520
Symptoms Simple Network Management Protocol (SNMP) ifIndexes may be different after a
switchover. This may be caused by bulk-sync of SNMP ifIndexes being broken.
Conditions This symptom is observed on a Cisco 7500, series routers, Cisco 10000 series edge
services routers, and on Cisco 12000 series Internet routers.
Workaround There is no workaround.
•
CSCdx54922
Symptoms A Performance Route Processor (PRP) having Border Gateway Protocol (BGP)/Interior
Gateway Protocol (IGP) with Multiprotocol Label Switching Traffic Engineering (MPLS-TE) can
cause exception when trying to reload the router. This leads to another reload.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.3)S1.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2107
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx58579
Symptoms A Performance Route Processor (PRP) may reload when a previously unformatted
bootflash is being formatted.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.3)S1.
Workaround There is no workaround.
•
CSCdx71842
Symptoms Adding an extended Border Gateway Protocol (BGP) community-list statement with any
illegal Regular Expression pattern into the global configuration on a router may cause the router to
reload.
The following is an example of a community-list statement that may cause the router to reload:
config t ip community-list expanded test permit (6327:[1_)
Conditions This symptom is observed when running Cisco IOS Release 12.0(19.1)S3 or a later
release.
Workaround Do not enter an extended BGP community-list statement that has an illegal Regular
Expression pattern.
Note
•
This symptom occurs on Cisco IOS Release 12.0(19.1)S3 and on later releases. It does not
happen on Cisco IOS Release 12.0(19.1)S or on earlier releases. It is not specific to any
platform.
CSCdx94801
Symptoms When you configure a Cisco 12000 series Internet router with ATM interfaces, the
secondary Route Processor (RP) reloads.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
EXEC and Configuration Parser
•
CSCdw53946
Symptoms A router may reload unexpectedly.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1.(12)
and that has Network Time Protocol (NTP) configured when a configuration change is made by a
user whose username has a percent (%) sign in it.
Workaround There is no workaround.
•
CSCdx18190
Symptoms The configuration under the “controller” for channelized linecards reappears after
removing it.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.2)S in a dual Route Processor (RP) system. If the configuration under
the “controller” for channelized linecards is removed, it is not synchronized to the standby. Hence,
on a switchover, the configuration reappears.
Workaround Remove the configuration followed by a switchover, and then remove the configuration
again.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2108
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx32133
Symptoms A router may reload with a bus error at address 0x500.
Conditions This symptom is observed on a Cisco 7500 router that has a Route Switch Processor
(RSP4) and that is running Cisco IOS Release 12.2(9.4a).
Workaround There is no workaround.
Interfaces and Bridging
•
CSCdt30389
Symptoms On a router, the PA-2CT1/PRI and PA-2CE1/PRI port adapters may cause occasional
(every 5 seconds or more) packets to get delayed by 100 to 200milli-seconds (ms).
Conditions This symptom is observed on a Cisco 7200 series router that is running Cisco IOS
Release 12.1(5)T1. The symptom is not noticeable unless interpacket delay is monitored at the
output ports or channels of these port adapters for a continuous stream of packets. Furthermore, this
delay is observed for the PRI mode of operation.
Workaround There is no workaround.
•
CSCdu78921
Symptoms A Multilayer Switch Feature Card (MSFC) may reload.
Conditions This symptom is observed after an upgrade from Cisco IOS Release 12.0(7)XE to
Release 12.1(8)AE.
Workaround There is no workaround.
•
CSCdu83983
Symptoms The output rate of an unspecified bit rate (UBR) virtual circuit (VC) can exceed the
configured peak cell rate (PCR) of the VC.
Conditions This symptom is observed on a Cisco 7500 series router with a PA-A3-OC12 port
adapter.
Workaround Configure the VC as variable bit rate nonreal-time (VBR-nrt) on the router, set peak
cell rate (PCR) equal to sustainable cell rate (SCR) and leave any network provisioning of the VC
as UBR.
Note
•
The ATM service category of a VC must not match on an ATM router endpoint and on ATM
network switches as long as equivalent traffic parameters are used.
CSCdv81601
Symptoms A very high negative value may be displayed on the out counters.
Conditions This symptom is observed on a Cisco 7100 router that is running Cisco IOS Release
12.1(9E). This symptom occurs if the packets from the hold queue are dropped.
Workaround There is no workaround.
•
CSCdw28119
Symptoms On a port adapter, some of the permanent virtual connections (PVCs) may not work
properly. Consequently, some of the switched virtual circuits (SVCs) may not come up properly.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2109
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a PA-A1 port-adaptor on a Cisco 7500 series router that is
running Cisco IOS Release 12.2(6.8)T.
Workaround Issue the shutdown interface global command to shut down the ATM interface. Wait
for approximately 40 seconds, and then issue the no shutdown interface global command to enable
the ATM interface.
•
CSCdw32980
Symptoms The following message may appear:
%ATMPA-3-SETUPVCFAILURE: ATM10/0/0: Platform Setup_vc failed for 0/100, vcd 7
Conditions This symptom is observed on a Cisco 7500 series router with a PA-A3-OC12 port
adapter.
Workaround There is no workaround.
•
CSCdw60490
Symptoms A router may use Cisco Express Forwarding (CEF) to switch IP packets that enter an
Inter-Switch Link (ISL) subinterface, regardless of the (interior) destination MAC address.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdw65799
Symptoms An ATM permanent virtual connection (PVC) may remain in the “INAC” state after it is
configured.
Conditions This symptom is observed on a Cisco router that is running the c7200-p-mz.122-7.4.S
image of Cisco IOS Release 12.2(7.4)S.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the ATM interface to restore the PVC.
•
CSCdw75291
Symptoms An autoinstall feature may not function properly.
Conditions This symptom is observed when a Cisco 7204VXR router is autoinstalled with a T3
connection.
Workaround There is no workaround.
•
CSCdw93032
Symptoms The s1s0 flag that is configured on Packet-over-SONET(POS) interfaces automatically
may reset to 0 after a reload.
Conditions This symptom is observed on a Cisco 7200 or a Cisco 7500 series router that is running
Cisco IOS Release 12.1(9)E.
Workaround There is no workaround.
•
CSCdx45485
Symptoms A router may pause indefinitely when the Inter-Switch Link (ISL) encapsulation is
unconfigured from a subinterface.
Conditions This symptom is observed on a Cisco 7200 series router that is running Cisco IOS
Release 12.0(21.3)S.
Workaround Use the dot1Q encapsulation instead.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2110
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx49370
Symptoms On configuring weighted fair queueing (WFQ) on a serial interface, the link starts
flapping.
Conditions This symptom is observed on a Cisco 7500 series router.
Workaround Perform a microcode reload.
•
CSCdx49398
Symptoms A router may reload.
Conditions This symptom is observed on a Cisco 7500 series router when Cisco IOS
Release 12.0(21.3)S is being loaded.
Workaround There is no workaround.
•
CSCdx65955
Symptoms When the last VLAN is removed on an interface, the interface maximum transmission
unit (MTU) may be set to less than the default value of 1524.
Conditions This symptom is observed only on Fast Ethernet and Gigabit Ethernet interfaces.
Workaround There is no workaround.
•
CSCdx87965
Symptoms A router that is configured with a multichannel port adapter reloads because of a bus error
exception.
Conditions This symptom is observed when link flaps occur or interfaces are reset on a router that
is configured with PA-MC-T1, PA-MC-E1, PA-MC-E3, or PA-MCX port adapters.
Workaround There is no workaround.
•
CSCin06773
Symptoms A router reloads immediately after configuring the card type for PA-MC-8TE1+ port
adapter.
Conditions This symptom is observed on a Cisco 75xx router. This symptom occurs if the online
insertion and removal (OIR) of the Versatile Interface Processor (VIP) that has the PA-MC-8TE1+
port adapter is performed before configuring the card type.
Workaround There is no workaround.
IP Routing Protocols
•
CSCds57882
Symptoms In a full mesh of route reflectors, one or two of the route reflectors may have a Border
Gateway Protocol (BGP) table with multiple entries for the same route (there should be only one)
with multiple tags. Clients of the route reflector still receive the correct BGP information. Virtual
Private Network (VPN) routing/forwarding instance (VRF) interfaces on the route reflector may get
an incorrect tag.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Clear the BGP session. Clearing the route fixes the tag situation, but not the BGP table.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2111
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdu08686
Symptoms A router may generate router link states but may fail to generate network link states for
a connected network. The Open Shortest Path First (OSPF) neighbors may come up correctly on all
the routers in the network.
Conditions This symptom is observed on a Cisco 7206VXR router that is running the OSPF Protocol
and acting as a designated router (DR).
Workaround Set the priority on the interface to 0 so that the router is not the DR for that link.
•
CSCdu43164
Symptoms A router may experience a memory leak.
Conditions This symptom is observed on a Cisco 7206VXR Provider Edge (PE) router that is
running Cisco IOS Release 12.1(5a) in a Multiprotocol Label Switching (MPLS)/Virtual Private
Network (VPN) network. The memory leak is caused by the Border Gateway Protocol (BGP) I/O
process and occurs at the rate of 100 KB to 130 KB per hour (about 2.5 MB to 3 MB per day) after
the show mem sum | incl BGP privileged EXEC command is entered. This situation occurs
regardless of whether the BGP neighbor is flapping.
The following is command output from the show proc mem | incl BGP privileged EXEC command:
PID TTY Allocated Freed Holding Getbufs Retbufs Process ... 104 0 3522569548
2139398320 21965976 297916 5184 BGP I/O
...
The show mem sum | incl BGP privileged EXEC command shows that function “BGP (1) update”
allocates memory without deallocating it again after the job is completed.
Router# show mem sum | incl BGP
Alloc PC Size Blocks Bytes What ... 0x607C42E0 65496 333 21810168 BGP (1) update ....
Workaround Reload the provider edge (PE) router.
•
CSCdv89098
Symptoms A Border Gateway Protocol (BGP) session may time out, and the router may display the
following message:
%BGP-3-NOTIFICATION: received from neighbor x.x.x.x x/x (hold time expired) 0 bytes
Conditions This symptom is observed on a Cisco router that is running Multiprotocol Label
Switching (MPLS) on an outbound interface that is connected to the MPLS network core and occurs
when a Border Gateway Protocol (BGP) session with a maximum segment size (MSS) which is
computed from the maximum transmission unit (MTU) of the router’s next-hop interface has been
established and the IP Transmission Control Protocol (TCP) path-mtu-discovery command has
been issued.
Workaround Adjust the IP MTU on one of the BGP routers using the ip mtu value command.
For example, to enforce a BGP session with a TCP MSS of 4426 bytes, issue the following
command:
Router(config-if)# ip mtu 4466
The MTU and the shim header add up in the following way: an MSS of 4426 bytes plus a 40-byte
TCP/IP header plus a 4-byte shim header equals 4470 (Packet-over-SONET [POS] link).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2112
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw15323
Symptoms The output of the show ip rsvp reservation EXEC command displays interface names
that are truncated to five digits. This behavior may also occur with the following show commands:
show ip rsvp request
show ip rsvp sender
show ip rsvp host receivers
show ip rsvp host senders
show ip rsvp temp-psb
show ip rsvp temp-rsb
Conditions This symptom is observed on a Cisco 7500 series router. This condition prevents port
numbers, such as those on Versatile Interface Processor (VIP) cards, from being displayed fully.
This condition occurs when the router is configured with the Resource Reservation Protocol (RSVP)
using the ip rsvp bandwidth interface configuration command while there is at least one ongoing
RSVP session.
Workaround There is no workaround.
•
CSCdw35031
Symptoms A buffer leak may occur in the small pool.
Conditions This symptom is observed when the Internet Group Management Protocol (IGMP) is
configured on a multilayer switch feature card.
Workaround There is no workaround.
•
CSCdw35985
Symptoms The Enhanced Interior Gateway Routing Protocol (EIGRP) may cause an unexpected
system reload at the igrp2_bandwidth_changed process.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdw36746
Symptoms A router may reload because of a bus error at an invalid address.
Conditions This symptom is observed on a Cisco 12000 series Internet router when Open Shortest
Path First (OSPF) is enabled and if the same interarea prefix is advertised from multiple areas and
is more than the path argument of the maximum-path path router configuration command that
exists in the interarea prefix.
Workaround There is no workaround.
•
CSCdw47116
Symptoms A router may reboot because of a memory allocation (MALLOC) error in the Border
Gateway Protocol (BGP) router process.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdw62875
Symptoms Routes may not exist in the tag forwarding table.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2113
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(20.3)ST on routes that exist in the Cisco Express Forwarding (CEF) table
and in the route table.
Workaround Reload the router.
•
CSCdw64457
Symptoms A router may issue a spurious access in rsvp_update_explicit_route.
Conditions This symptom is observed on a Cisco IOS router that is running Cisco IOS
Release 12.0 ST and Release 12.0 S with Multiprotocol Label Switching (MPLS) traffic
engineering (TE) tunnels and the Resource Reservation Protocol (RSVP) but only when memory
allocation failures are occurring on the router.
Workaround There is no workaround.
•
CSCdw83512
Symptoms A system may reload.
Conditions This symptom is observed when a write terminal EXEC command is issued.
Workaround There is no workaround.
•
CSCdw83531
Symptoms Border Gateway Protocol (BGP) updates may be corrupted. The following message may
be displayed when this symptom occurs:
BGP-6-NEXTHOP: Invalid next hop (0.0.0.0) received from x.x.x.x: martian next hop
BGP(0): x.x.x.x rcv UPDATE w/ attr: nexthop 0.0.0.0, origin ?, metric 0, originator
0.0.0.0, path YYYY, community, extended community 20.1.1.0/24 -- DENIED due to:
martian NEXTHOP;
Conditions This symptom is observed on a customer edge (CE) router when BGP updates are sent
from a provider edge (PE) router to the CE router if peer groups are specified using the
address-family ipv4 vrf vrf-name router configuration command. BGP routes may be lost on the
CE router even though the BGP neighbors remain up.
Workaround Remove the peer group configuration from the address-family ipv4 vrf vrf-name
router configuration command.
•
CSCdx03185
Symptoms A router may reload when it is searching the Resource Reservation Protocol (RSVP)
database.
Conditions This symptom is observed on a Cisco router that is running in the Route Processor
Redundancy Plus (RPR+) or the Stateful Switchover (SSO) mode. The router reloads when a tunnel
is up and when Multiprotocol Label Switching-traffic engineering (MPLS-TE), Cisco Express
Forwarding (CEF), and IP routing are unconfigured using the following sequence of commands:
no tag advertise-tags
no mpls ip
no mpls label protocol ldp
no ip routing
no ip cef
no mpls traffic-eng tunnels
Workaround Issue the no mpls traffic-eng tunnels router configuration command to shut down all
tunnels before issuing the no ip routing global configuration command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2114
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx06621
Symptoms A router may reload with a bus error while the Shortest Path First (SPF) algorithm is
computed.
Conditions This symptom is observed if multiple routers are advertising the same prefix in Type-5
or Type-7 link-state advertisements (LSAs).
Workaround There is no workaround.
•
CSCdx07305
Symptoms Enhanced Interior Gateway Routing Protocol (EIGRP) can log a spurious access.
Conditions This symptom is observed under unusual circumstances when removing or changing
network statements.
Workaround There is no workaround.
•
CSCdx07527
Symptoms Border Gateway Protocol (BGP) peergroup statements are ignored.
Conditions This symptom is observed on BGP peergroup statements with multicast network layer
reachability information (NLRI) only after a reload.
Workaround Reconfigure the router while it is running.
•
CSCdx17459
Symptoms A software-forced reload may occur on a router.
Conditions This symptom is observed on a Cisco 12008 router that has a Multiprotocol Label
Switching (MPLS) traffic engineering (TE) tunnel that is configured with an absolute metric when
the tunnel is used with the Open Shortest Path First (OSPF) protocol. A watchdog timer event may
be triggered, and the router may reload after the shutdown interface configuration command
followed by the no shutdown interface configuration command is issued on the tunnel interface.
Workaround There is no workaround.
•
CSCdx17597
Symptoms A Multilayer Switch Feature Card (MSFC) and Supervisor Engine may reload during an
attempt to format a withdrawn routes message (“MP_UNREACH”) for that address family.
Conditions These symptoms are observed on an MSFC and Supervisor Engine that function in a
multiprotocol Border Gateway Protocol (MP-BGP) environment with an address family other than
the IPv4 unicast address family (such as the IPv4 multicast address family) and with a large number
of prefixes in the corresponding BGP table.
Workaround Remove the address family other than the IPv4 unicast address family.
•
CSCdx19804
Symptoms The neighbor x.x.x.x translate-update router configuration command may break. Also,
this command may not appear under the address-family ipv4 multicast family address submode
command.
Conditions This symptom is observed after the merge of the Cisco IOS Release 12.0 S and
Release 12.0 ST.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2115
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx25551
Symptoms A software-forced reload may occur on a router.
Conditions This symptom is observed on a Cisco router if an interface is shut down from another
terminal while output from the show ip pim neighbor EXEC command is displayed.
Workaround There is no workaround.
•
CSCdx25807
Symptoms The redistribute static route-map router configuration command may not work
correctly if it is issued under a multicast address family.
Conditions This symptom occurs only if a static route is redistributed into IP version 4 (IPv4)
unicast through the network statement and if the static routes are redistributed into multicast using
a redistribute statement.
Workaround Issue the redistribute static route-map router configuration command to redistribute
the static routes for IPv4 unicast.
•
CSCdx32947
Symptoms When the ip pim rp-address ip-address [group-access-list] [override] [bidir] global
configuration command is configured, a conflict that is learned from an Auto Rendezvous Point
(Auto-RP) announcement is still used even if the override keyword is specified.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.2 S.
The router still accepts information from the Auto-RP when this symptom occurs. This symptom
does not occur if routers do not have conflicting information.
Workaround There is no workaround.
•
CSCdx38760
Symptoms A router may reload at the chunk_lock() point.
Conditions This symptom is observed on a Cisco 7500 router that is running Cisco IOS
Release 12.2(10.1)S.
Workaround There is no workaround.
•
CSCdx42726
Symptoms A router may reload, and pings may not pass through.
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(22)S during Address Resolution Protocol (ARP) processing routines.
Workaround There is no workaround.
•
CSCdx46554
Symptoms A route map that has the match nlri unicast multicast command is broken into two route
maps, one with the original route-map tag and the other with “_mcast” extended.
Conditions This symptom is observed on a Cisco router when an old route map format is changed
to the new route map format and if a named community list or an extended community list is
configured.
This translation can be automatically done or user-initiated if the bgp upgrade-cli router
configuration command is available.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2116
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
If a startup configuration has a route map that contains the match community community name
route-map configuration command or the match extcommunity extended community-list number
route-map configuration command, the router may reload if the write terminal privileged EXEC
command, the show running-config privileged EXEC command, or the show route-map privileged
EXEC command is issued after the original route map is deleted.
Workaround Delete the match nlri unicast multicast route-map configuration command from the
startup-config file or avoid deleting the original route map after the system is loaded.
Alternate Workaround Do not issue the bgp upgrade-cli router configuration command.
•
CSCdx49181
Symptoms When an additional new area is added to the provider edge (PE), all the type 3 link-state
advertisements (LSAs) learned from other PEs via Border Gateway Protocol (BGP) do not get
redistributed into this new area.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Issue the clear ip ospf redistribution command.
•
CSCdx49744
Symptoms A link-state advertisement (LSA) may not get flushed from the database.
Conditions This symptom is observed when an LSA is changed from type 3 to type 5.
Workaround Issue the clear ip ospf x process command.
•
CSCdx53795
Symptoms If a peer advertises a replacement path (with the same MED as in the original path), the
new path will be inserted in the original path’s position. In other words, the replacement path may
not be grouped with paths from the same autonomous system number (ASN) (as deterministic-med
should). The ordering may result in incorrect routing, including routing loops.
Conditions This symptom is observed on a Border Gateway Protocol (BGP) router using
deterministic-med.
Workaround There is no workaround. However, once the router is in the incorrect state, the situation
can be corrected by disabling deterministic-med and then reenabling it.
•
CSCdx69165
Symptoms When a provider edge (PE) router must advertise a large number of Virtual Private
Network version 4 (VPNv4) prefixes to another PE router, the initial convergence time may be very
long (more than 20 minutes), or convergence may never occur. One result of this defect is that the
number of Border Gateway Protocol (BGP) messages used to propagate the VPNv4 prefixes may be
greater than the number of prefixes.
Conditions This symptom is observed on Cisco IOS Release 12.0(21.3)S.
Workaround There is no workaround.
•
CSCdx69995
Symptoms If Border Gateway Protocol (BGP) has more than a few hundred Virtual Private Network
version 4 (VPNv4) prefixes to advertise, you may see the following message:
%BGP-3-INSUFCHUNKS: Insufficient chunk pools for message, requested size 4204
BGP may not be able to advertise the VPNv4 routes.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2117
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx70216
Symptoms When a link-state advertisement (LSA) with an incontiguous mask is sent to a router, the
router may reload. Also, a Multilayer Switch Feature Card 2 (MSFC 2) may reload with a bus error
in the not so stubby area (NSSA) part of the Open Shortest Path First (OSPF) code.
Conditions This symptom is observed on any Cisco router that is running a Cisco IOS software
release.
Workaround Do not send address LSAs with illegal masks, that is masks that are not contiguous, to
a router
•
CSCdx73662
Symptoms A router may reload because of a bus error after the show ip sdr EXEC command is
entered.
Conditions This symptom is observed on a Cisco 7513 router that is running either Cisco IOS
Release 12.0(21.1)S2 or Release 12.0(21.3)S1. This symptom occurs because an invalid
Source-Active (SA) message is received without the name.
Workaround There is no workaround.
•
CSCdx74764
Symptoms A Performance Route Processor (PRP) can cause exception when trying to reload the
router.
Conditions This symptom is observed on a PRP that is running Cisco IOS Release 12.0(21)3S and
that has BGP/Interior Gateway Protocol (IGP) with Multiprotocol Label Switching-traffic
engineering (MPLS-TE).
Workaround There is no workaround.
•
CSCdx75987
Symptoms Tracebacks may be seen.
Conditions This symptom is observed when using the offset list router configuration command in
Enhanced Interior Gateway Protocol (EIGRP) and when removing a summary address from an
interface with a Virtual Private Network (VPN) routing/forwarding (VRF) defined.
Workaround There is no workaround.
•
CSCdx83393
Symptoms A Cisco router may reload.
Conditions This symptom is observed when sham-link is configured.
Workaround There is no workaround.
•
CSCdx84465
Symptoms A Fast Reroute (FRR) Merge Point router may reload.
Conditions This symptom is observed if the input I/F for the label switched path (LSP) goes down
and there is no chance that the LSP could have been fast- rerouted at the previous hop (PHOP) or at
the previous- previous hop (P-PHOP).
Workaround There is no workaround.
•
CSCdx87316
Symptoms A downstream multicast router may have a group in the mroute table, yet the upstream
multicast router may not show the downstream multicast router in the outgoing interface list.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2118
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed only in rare circumstances.
Workaround Issue the clear ip mroute group EXEC command.
•
CSCdx89413
Symptoms Subnets in the /31 range may not be accepted.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S.
Workaround There is no workaround.
ISO CLNS
•
CSCdw29177
Symptoms Both the parallel routes may be deleted by Intermediate System-to-Intermediate System
(IS-IS) when just one of them is shut down.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(20.3)ST when two routers are connected using ATM (tc-atm) parallel links, for
example, a1/0.1 and a1/0.2, and the routing protocol is IS-IS. If you shut down a1/0.2, IS-IS deletes
both the routes from the routing table even though a1/0.1 is still active.
Workaround Issue the shutdown interface configuration command followed by the no shutdown
interface configuration command on the ATM link (a1/0.1).
•
CSCdx02446
Symptoms An incorrect load-balancing algorithm may occur after the bandwidth of one of the
tunnels is changed.
Conditions This symptom is observed when multiple Multiprotocol Label Switching (MPLS) traffic
engineering tunnels are peered to the same destination.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the tunnel in which the bandwidth change occurred.
Miscellaneous
•
CSCdm25278
Symptoms Multichannel T1/E1 port adapters may show the Layer 1 status in the ACTIVE state in
the show isdn status [output] EXEC command even after the D channel is shut down.
Conditions This symptom is observed in Cisco IOS Release 12.0 and Release 12.1.
Workaround Shut down the T1 or the E1 controller.
•
CSCdr39591
Symptoms Opening the port configuration shows all fields as “N/A” or as having incorrect values.
Also, port Monitor Interface charts do not get updated and do show errors in the status bar.
Conditions These symptoms are observed in CiscoView on a MultiChannel DS3 port adapter in the
WS-X6182-PA module.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2119
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCds49256
Symptoms The Advanced Technology Attachment (ATA)-disk file system may become corrupted.
Conditions This symptom is observed if a write operation is interrupted. There are various reasons
for the interruption including loss of power, a software reload, and removal of the ATA-disk card
during a write.
Workaround There is no workaround.
•
CSCdt41343
Symptoms A Cisco router may reload.
Conditions This symptom is observed when the configuration of the router is directly written from
TFTP to NVRAM or from Cisco IOS Release 12.0 and, in both cases, when a syslog server and
syslog source interface have been defined before the source interface has been parsed.
Workaround Place the syslog server and syslog source interface configurations after the source
interface itself. To do this, you have to edit the configuration offline, copy it to NVRAM, and then
reboot.
•
CSCdt70041
Symptom 1 A Cisco Ethernet over Multiprotocol Label Switching (EoMPLS) implementation will
free and advertise new virtual circuit (VC) labels in response to a Label Distribution Protocol (LDP)
label mapping request.
Condition 1 This symptom is observed when the Cisco EoMPLS is implemented. The impact of this
symptom has caused undesirable interoperability with other vendors’ EoMPLS implementations.
Symptom 2 MPLS label space may become exhausted because of the slow leaking of EoMPLS VC
labels.
Condition 2 During a label readvertisement in response to an LDP label mapping request, in some
rare instances, a previously allocated label may not be properly freed. This symptom is observed in
the Cisco EoMPLS implementation in Cisco IOS Release 12.1E and Release 12.0(22)S.
EoMPLS was modified to readvertise the same label in response to a label mapping request and
properly free unused VC labels.
Workaround There is no workaround except to reboot the router.
•
CSCdu33067
Symptoms A Gigabit Ethernet interface may reset.
Conditions This symptom is observed on a Cisco 7200 series router when a large number of
subinterfaces are added to the Gigabit Ethernet using a vendor-specific Virtual Private Network
(VPN) configuration product or a script.
Workaround Add fewer subinterfaces at each attempt.
•
CSCdu37284
Symptoms Previous or initial ping requests may disappear from a router.
Conditions This symptom is observed on a Cisco 2600 router when ping requests are sent
consecutively; that is, when a second ping request is created immediately after an initial ping (using
the same serial number as the initial ping request).
Workaround There is no workaround.
•
CSCdv48025
Symptoms A fast cache entry may get built when inbound NetFlow is configured on top of
Cisco Express Forwarding (CEF) on an Ethernet interface.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2120
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a Cisco Route Switch Processor (RSP) that is running
Cisco IOS Release 12.2 or Release 12.2 T with an Ethernet to Fast Ethernet channel combination
topology.
Workaround There is no workaround.
•
CSCdv49325
Symptoms A Versatile Interface Processor (VIP) may reload with a stack trace to location
vip_feature_tagswitch().
Conditions This symptom is observed on a Cisco 7500 router if you toggle Multiprotocol Label
Switching (MPLS).
Workaround Do not toggle MPLS.
•
CSCdv54509
Symptoms The following message may be displayed:
SYS-3-INVMEMINT: Invalid memory action (malloc) at interrupt level
Conditions This symptom is observed when an X.75 call is made on either an E1 or a PRI interface.
This symptom has no user impact.
Workaround There is no workaround.
•
CSCdv58146
Symptoms A packet may become corrupted.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(19.6)ST6 with a two-tagged packet that has an Explicit Null Tag on top and
a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) tag at the bottom.
Workaround There is no workaround.
•
CSCdv67822
Symptoms Packets that are traveling through a tunnel that is protected using Fast Reroute (FRR)
may be lost while the tunnel recovers from a link failure.
Conditions This symptom is observed in Cisco IOS software that is running Multiprotocol Label
Switching (MPLS) Traffic Engineering (TE).
Workaround There is no workaround.
•
CSCdv78596
Symptoms Outgoing packets may drop from a cable interface.
Conditions This symptom is observed on a Cisco uBR7200 series router that is running Cisco IOS
Release 12.1(9)EC and that has Cisco Express Forwarding (CEF) enabled.
Workaround Disable and then reenable CEF.
•
CSCdv80428
Symptoms A Cisco router may pause indefinitely.
Conditions This symptom is observed when a virtual circuit (VC) class is attached to an interface
that has a large number of VCs configured. When the router pauses indefinitely and if the adjacent
interface and the local interface are shut down, the show interface atm EXEC command will
indicate a negative number. After this error occurs, no more VCs can be created. To recover from
this error, a user has to reboot the router.
Workaround To prevent this condition from occurring, do not shut down the adjacent interface in the
middle of a VC class configuration.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2121
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdv84259
Symptoms A non-Versatile Interface Processor (VIP) card interface may come up with the ip
route-cache distributed command enabled by default, causing some features to fail.
Conditions This symptom is observed on a Cisco 7500 series router when the ip cef distributed
command is globally enabled.
Workaround Configure the no ip route-cache distributed interface configuration command on
non-VIP card interfaces.
•
CSCdv85794
Symptoms The SONET framer on the line card may not switch to the “internal” clock, causing the
SONET framer to be unable to transmit valid SONET frames.
Conditions This symptom is observed if the clock in the SONET controller on a CHOC-12 line card
that is installed in a Cisco 10000 series edge services router is configured as “line” and Loss of
Signal (LOS) is detected.
Workaround Enter the clock source internal command manually to configure the clock in the
SONET controller as “internal”.
•
CSCdv86798
Symptoms The state of a secondary controller may not get updated after resetting both the primary
and the secondary line cards. The traffic flow is not affected.
Conditions This symptom is observed on a Cisco 10000 series edge services router that is configured
with a Performance Routing Engine (PRE)—as opposed to a PRE-1, to which this caveat does not
apply—and that has Automatic Protection System (APS) enabled on 4-port STM-1 line cards.
Workaround On each port of each STM-1 line card, enter the aps force SONET slot#/subslot#/port#
from working interface configuration command, which will force the APS signal state of the
controller to be updated.
•
CSCdv86945
Symptoms An E1 controller may display inaccurate statistics after the show controllers [e1 | t1]
EXEC command is issued. The following command output shows that the elapsed seconds and the
unavailable counters do not advance:
Timestamp - 00:00 E1 3/4 is up. Applique type is Channelized E1 - balanced Framing is
UNFRAMED, Line Code is HDB3, Clock Source is Line. 0 Errored Secs, 0 Bursty Err Secs,
0 Severely Err Secs, 270 Unavail Secs 0 Errored Secs, 0 Bursty Err Secs, 0 Severely
Err Secs, 86400 Unavail Secs
Timestamp - 01:50 E1 3/4 is up. Applique type is Channelized E1 - balanced Framing is
UNFRAMED, Line Code is HDB3, Clock Source is Line. 0 Errored Secs, 0 Bursty Err Secs,
0 Severely Err Secs, 270 Unavail Secs 0 Errored Secs, 0 Bursty Err Secs, 0 Severely
Err Secs, 86400 Unavail Secs
Conditions This symptom is observed when an E1 controller is configured for unframed operations
using the controller {t1 | e1} slot/port channel-group 0 unframed global configuration command.
The counters are correct when the controller is configured for a Frame Relay operation (CRC-4 or
No-CRC4).
Workaround There is no workaround.
•
CSCdw00005
Symptoms Certain interfaces that are configured on a T1 line may stop passing traffic.
Conditions This symptom is observed when a channelized port adapter (CT3) is used and if framing
is reconfigured with the t1 1 framing esf privileged EXEC command. This condition occurs only if
the t1 1 framing esf privileged EXEC command is issued after channel groups are already
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2122
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
configured on the T1 line and while the channel groups are passing traffic. The framing needs to be
set only for the T1 line when the first channel group is configured and does not need to be reentered
when a new channel group is added.
Workaround Issue the t1 1 framing esf privileged EXEC command only when the first interface on
a T1 line is configured.
•
CSCdw00011
Symptoms All interfaces may stop passing traffic if T1 frames are received on one of the groups that
has voice signaling enabled.
Conditions This symptom is observed when a channelized T3 port adapter (CT3) that is configured
with multiple channel groups is used.
Workaround Shut down the interface that corresponds to the channel group that is receiving the
invalid frame. If any of the other interfaces continues to flap after the interface that is receiving the
invalid frame is shut down, the interface has to be reconfigured.
•
CSCdw09409
Symptoms A router may become totally inoperable and no longer forward traffic or respond to
console commands. Restoring the affected router to normal operation requires either a manual power
cycling or a break-in and soft reset using the console break sequence.
Also, the router may reload because of a software-forced reload. This occurs because the router goes
into an infinite look, and the watchdog timer starts and reloads the router.
Conditions These symptoms are observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(17)S, Release 12.0(18)S, Release 12.0(19)S, or a rebuilt release that is
based on one of these three releases and that is configured with one or more 3-port Gigabit Ethernet
line cards.
This situation is caused by a very rare event in the Address Resolution Protocol (ARP) code that
may cause data structure corruption, which results in system instability. Because of the rare nature
of this event, the affected router may experience intermittent indefinite pauses at intervals of hours
up to several months.
Workaround There is no workaround.
Note
•
This caveat does not apply to a router that is configured with one or more single-port Gigabit
Ethernet line cards.
CSCdw09633
Symptoms A disposition line card (POS-OC-48) may generate ToFab Buffer Management
application-specific integrated circuit (ASIC) (BMA) errors and physical layer interface module
(PLIM) errors, and eventually reload.
Conditions This symptom is observed when an output access control list (OACL) on an imposition
line card (3x Gigabit Ethernet) that is running the Ethernet over Multiprotocol Label Switching
(EoMPLS) bundle is configured.
Workaround Do not configure an OACL while the EoMPLS bundle is running on the imposition line
card. Note that OACL is not supported with the EoMPLS bundle and that the OACL bundle has a
lower priority than the EoMPLS bundle. Unload the EoMPLS bundle before configuring OACLs for
the OACL bundle.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2123
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw10010
Symptoms A router may not forward multicast traffic over a PA-2FE port channel in a distributed
path.
Conditions This symptom is observed on a Cisco 7504 router that is running Cisco IOS
Release 12.2(6.3)T. The multicast traffic is switched in the fast-switching path only. DDTS
CSCds38187 has fixed the problem for 1-port FE-PA.
Workaround There is no workaround.
•
CSCdw11263
Symptoms When reloaded with bidirectional traffic ON, a router configured as Layer 2 Tunneling
Protocol (L2TP) Network Server (LNS) may reload at dec21140_rx_interrupt. The symptom does
not surface after a successful bootup of the router or during normal operation of the router.
Conditions This symptom is observed on a Cisco 7200 router.
Workaround Reload the router with LOW/NO traffic.
•
CSCdw18116
Symptoms An output stuck condition may occur on a multichannel port adapter such as a PA-MC-T1
or a PA-MC-E1.
Conditions This symptom is observed under stress conditions when the port adapter is configured to
operate in the PRI mode.
Workaround There is no workaround.
•
CSCdw22985
Symptoms Forwarding performance (in packets per second) of Engine 0 and Engine 1 Cisco 12000
series Internet router line cards is lower in Cisco IOS Release 12.0(20.3)ST and in
Release 12.0(20.3)S than in Release 12.0(18)ST or in Release 12.0(18)S.
Conditions This symptom is observed when any input feature is enabled on these line cards or any
output feature is enabled on any line card in the router. One can also observe that the sampled
NetFlow performance of the Engine 2 Cisco 12000 series Internet router line cards becomes
degraded in terms of 1:N.
Workaround There is no work around.
•
CSCdw24515
Symptoms A line card may reload.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(20.3)ST when the same access control list (ACL) is applied to two or more
main interfaces followed by any ACL being applied to a sub-interface on one or more of the same
main interfaces.
Workaround There is no workaround.
•
CSCdw24762
Symptoms An Engine 4 Plus 4-port OC-48 line card may reload.
Conditions This symptom is observed if the hw-module slot slot-number shutdown privileged
EXEC command is used to perform an online insertion and removal (OIR) of the primary Clock and
Scheduler Card (CSC) of a Cisco 12000 series Internet router during active traffic.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2124
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw24905
Symptoms The following error message and traceback may occur:
%DMLPGRP-4-NOTCX3LINK: cannot remove the link because it is not CX3 -Traceback=
50312618 505E4400 505E7258 501BB5CC 501BB5B
Conditions This symptom is observed on a Cisco 12000 series Internet router if Multilink PPP
(MLPPP) is configured on a 6-port channelized T3 line card and an online insertion and removal
(OIR) of the line card is performed.
Workaround There is no workaround.
•
CSCdw25047
Symptoms A memory leak may occur on a router.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.1(8).
The symptom occurs at the “logger” process. Also, when the show process cpu EXEC command is
issued, there is increased utilization in the “tty background” process.
Workaround Disable “logging synchronous” under the vty, aux, and console ports as in the
following example:
line con 0 no logging synchronous
•
CSCdw26306
Symptoms If the write memory EXEC command is issued simultaneously with the show config
privileged EXEC command or the show running-config EXEC command via two individual Telnet
sessions by two different users, output similar to the following may be displayed:
bGc nx
^@^@^@^A^A^A^@^@^A^@^@^E^@^@^@^@^@^@^@^@^@^@^^@^@^@^@^@^@^@^A^@^@^@^@^@^@^@^@^
@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^
Conditions This symptom is observed on a Cisco 7500 router that is running Cisco IOS
Release 12.1(10)E.
Workaround There is no workaround.
•
CSCdw27936
Symptoms A ping may not go through across ATM adaptation layer 5 (AAL5) Subnetwork Access
Protocol (SNAP) encapsulated interfaces.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.2(6.8)T.
Workaround There is no workaround
•
CSCdw29751
Symptoms The Format slot0 EXEC command gives an error message while formatting
32 MB/48 MB/64 MB Personal Computer Memory Card International Association (PCMCIA)
Linear flash cards.
Conditions This symptom is observed on a all platforms.
Workaround Use a PCMCIA flash card that has a capacity of less than 32 MB.
•
CSCdw29949
Symptoms A router may stop forwarding traffic.
Conditions This symptom is observed when tag-to-tag load balancing is enabled on a Cisco 12000
series Internet router with an Engine 4 line card that is serving as an ingress line card.
Workaround Enter the clear ip route * EXEC command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2125
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw30320
Symptoms A forwarding table may not be populated with the complete Layer 2 outgoing
information, and packet loss may occur.
Conditions This symptom is observed on a Cisco 12000 series Internet router or a Cisco 10000
series edge services router in a Multiprotocol Label Switching (MPLS) Virtual Private Network
(VPN) and Gigabit Ethernet environment.
Workaround Enter the clear ip route EXEC command for the affected prefix.
•
CSCdw30397
Symptoms An OC48/SRP line card may fail because of an egress access control list (ACL) on an
Engine 2 line card that is installed in a router.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0 (21)S.
Workaround There is no workaround.
•
CSCdw31238
Symptoms A Secure Shell (SSH) client may fail to connect to a router if the router is reloaded with
hardware encryption disabled.
Conditions This symptom is observed on a Cisco 1710 router that has a Virtual Private Network
(VPN) hardware encryption module and that has hardware encryption enabled. The SSH client
cannot connect to the router after hardware encryption is disabled by issuing the no crypto engine
accelerator global configuration command after the changes are saved into NVRAM and the
Cisco 1710 router is reloaded. This symptom occurs only if the no crypto engine accelerator global
configuration command is issued on the router while a hardware encryption module is enabled.
Workaround To prevent this symptom from occurring, do not disable hardware encryption on the
router using the no crypto engine accelerator global configuration command while the hardware
encryption module is installed on the router.
•
CSCdw32302
Symptoms A router bitswaps the source MAC address from the client before putting the source MAC
address into ring number, and the connection may fail.
Conditions This symptom is observed in a setup in which Internetwork Packet Exchange (IPX)
traffic is passed between a client and a server on different token rings and if the token rings are put
in a bridge group on a Cisco router that is performing integrated routing and bridging (IRB). The
connection comes up normally if both the client and the server are on the same ring and when none
of the configurations on the devices is changed. This situation occurs only with MAC-level multicast
or broadcast traffic (such as Routing Information Protocol [RIP] traffic).
Workaround There is no workaround.
•
CSCdw36599
Symptoms Packet switch ASIC (PSA) tracebacks may get stuck in the pipeline on a provider edge
(PE) router, and traffic may be interrupted.
Conditions This symptom is observed a Cisco 12000 series Internet router that is running Cisco IOS
Release 12.0(20.3)ST1 and that is configured with an Engine 2 Packet-over-SONET line card in a
Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) routing/forwarding (VRF)
environment. The symptom occurs if you change the configuration from a Frame Relay
subinterface-based VRF to a High-Level Data Link Control (HDLC)-based VRF.
Workaround Enter the hw-module slot shelf-id/slot-number privileged EXEC command on the
Engine 2 line card. Traffic will resume after the line card has reloaded.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2126
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw37661
Symptoms The following error message may be displayed:
SLOT 6:00:01:52: %EE48-5-TM_PROC: TCAM Mgr Add Table not free(40), Alpha:RX Lbl:6148
Appl:3 fail: 40
Conditions This symptom is observed when the Modular quality of service (QoS) Command Line
Interface ([CLI] MQC) is used to apply the same committed access rate (CAR) rule to two different
interfaces, and then the CAR rule is unconfigured and reconfigured on both interfaces.
Workaround Copy the new configuration from the TFTP server instead of entering the configuration
manually.
•
CSCdw37768
Symptoms A router may still display messages that are associated with a removed line card even
after the line card has been removed from the slot.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(18)S.
Workaround There is no workaround.
•
CSCdw39055
Symptoms During development testing it was found that the virtual circuit (VC) was brought up
even though the Ethernet line protocol was down.
Conditions This symptom was observed on a Cisco 10700 series edge services router that was
running Cisco IOS Release 12.0(21.2)S. It may also occur on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdw39391
Symptoms A router may drop all data packets that are exported through the interface Ethernet 0.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)S.
Workaround Configure the route-cache cef interface configuration command on the interface
Ethernet 0.
•
CSCdw42422
Symptoms All of the incoming packets may be punted to the line card CPU. This situation may cause
most of the traffic to be dropped because of the limited processing capability of the line card CPU.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(20.3)ST2. The symptom occurs in a Multiprotocol Label Switching
(MPLS) Virtual Private Network (VPN) environment, if the ingress line card of a provider router is
an Engine 4 Plus (E4+) line card.
Workaround There is no workaround.
•
CSCdw42569
Symptoms A Cisco 12000 series Internet router reloads with the following message in its boot Flash
memory:
UTC: %SYS-3-BADBLOCK: Bad block pointer 63E980C0
UTC: %SYS-6-MTRACE: mallocfree: addr, pc
UTC: %SYS-6-MTRACE: mallocfree: addr, pc
UTC: %SYS-6-BLKINFO: Corrupted next pointer blk 63E980C0, words 18, alloc 60403DF4,
Free, deal loc D0D0D0D, rfcnt 0
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2127
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdw43099
Symptoms Sample NetFlow does not function.
Conditions This symptom is observed when Frame Relay policing and Sample NetFlow are
configured together on a router.
Workaround There is no workaround.
•
CSCdw44770
Symptoms A router reloads when you disable the ip mobile arp command.
Conditions This symptom is observed on a router that has the ip mobile arp command enabled and
that has Open Shortest Path First (OSPF) and various static routes configured.
Workaround There is no workaround.
•
CSCdw46156
Symptoms An interface of an Engine 4 Plus (E4+) line card stops receiving Intermediate
System-to-Intermediate System (IS-IS) updates.
Conditions This symptom is observed in Cisco IOS Release 12.0(20.3)ST when you configure a
maximum transmission unit (MTU) size that is smaller than 4558 on both sides of the link and after
you enter the shutdown interface configuration command followed by the no shutdown interface
configuration command on the interface of the E4+ line card.
Workaround Reload microcode onto the line card.
Alternate Workaround Change the size of the MTU in the interface to any other value than 4558.
•
CSCdw46736
Symptoms Multiprotocol Label Switching (MPLS) imposes incorrect tags and therefore routes
traffic incorrectly or other problems may occur.
Conditions This symptom is observed on a Cisco 10000 series edge services router if you attempt to
enable the ip cef accounting per-prefix non-recursive global configuration command. Note that
the ip cef accounting global configuration command is not supported on a Cisco 10000 series edge
services router and should therefore not be configured on that router.
Workaround Do not configure Cisco Express Forwarding (CEF) commands.
•
CSCdw47291
Symptoms All traffic, including Open Shortest Path First (OSPF) adjacencies, is dropped from an
egress interface of an Engine 3 Packet-over-SONET (POS) line card.
Conditions This symptom is observed when you change the maximum transmission unit (MTU) size
on the ingress interface and a buffer carving error occurs on the egress interface of the same
Engine 3 POS line card. Changing the MTU size to the default value does not resolve the situation.
Workaround On each egress interface of the Engine 3 POS line card, enter the shutdown interface
configuration command followed by the no shutdown interface configuration command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2128
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw47388
Symptoms An output access control list (ACL) does not filter traffic.
Conditions This symptom is observed when you configure an output ACL with 448 lines on a
Cisco 12000 series Internet router and the ingress line card for the traffic that needs to be filtered is
an 8-port or 16-port OC-3 Packet-over-SONET (POS) line card.
Workaround Do not configure an ACL with more than 128 lines on any interface of a Cisco 12000
series Internet router that is configured with an 8-port or 16-port OC-3 POS line card.
•
CSCdw47411
Symptoms A Stateful Switchover (SSO) is prevented.
Conditions This symptom is observed when you enable a Multiprotocol Label Switching (MPLS)
Virtual Private Network (VPN).
Workaround There is no workaround.
•
CSCdw48035
Symptoms The line protocol of an interface that is receiving traffic may flap and any Border
Gateway Protocol (BGP) sessions on this interface will be lost.
Conditions This symptom is observed when you configure access control lists (ACLs) on a
Cisco 12000 series Engine 2 line card and many packets are denied (for example, in a denial of
service attack).
Workaround There is no workaround.
•
CSCdw48038
Symptoms Inbound packets that enter through an Engine 2 line card are not switched correctly and
may be dropped.
Conditions This symptom is observed when you configure an access control list (ACL) on a
Cisco 12000 series Engine 2 line card that has Sampled NetFlow enabled and the packets are
switched out of the Engine 2 line card with the output ACL applied.
Workaround Do not configure output ACLs on a Cisco 12000 series Internet router that is
configured with an Engine 2 line card that has Sampled NetFlow enabled.
•
CSCdw50348
Symptoms Traffic between two customer edge (CE) routers drops from Frame Relay subinterfaces.
Conditions This symptom is observed in a Virtual Private Network (VPN) environment that has one
customer edge (CE) router connected to a provider edge (PE) router. This PE router is connected to
another PE router that is, in turn, connected to another CE router. For this caveat to occur, the
following configuration conditions need to be present:
•
Both PE routers are connected through a one-hop traffic engineering (TE) tunnel.
•
Basic Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP) explicit null
is turned on in one PE router.
•
Both PE routers are load balanced.
•
One PE router and one CE router have external Border Gateway Protocol (eBGP) running
between them.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2129
Resolved Caveats—Cisco IOS Release 12.0(22)S
In the above-mentioned configuration, if you enter the no tag ip command followed by the tag ip
command on one of the PE routers and you repeat this sequence of commands a few times, traffic
between the two CE routers will drop from Frame Relay subinterfaces that are configured on
Engine 3 links between the PE router and the CE router that have eBGP running between them. This
condition occurs because of an incorrect entry in the Engine 3 ingress line card.
Workaround Reload the PE router with the incorrect entry in the Engine 3 ingress line card.
•
CSCdw50615
Symptoms A slow memory leak is generated in both the memory of a Cisco 12000 series Engine 2
line card and the Packet Switching ASIC (PSA) SRAM or SDRAM memory.
Conditions This symptom is observed when you use the ip multicast hw-accelerate command to
configure fast switching with multicast hardware switching on a Cisco 12000 series Engine 2 line
card.
Workaround There is no workaround.
•
CSCdw50839
Symptoms Packets on a Versatile Interface Processor (VIP) are dropped.
Conditions This symptom is observed on a Cisco 7500 series router that is configured as a provider
edge router in a Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) switching
environment when there are no distributed Cisco Express Forwarding (dCEF) entries for the remote
VPN routing/forwarding (VRF) route.
This symptom occurs if a VRF is deleted after dCEF and the Border Gateway Protocol (BGP) are
disabled from any previous MPLS VPN configuration.
Workaround Disable and reenable distributed dCEF by issuing the no ip cef distributed global
configuration command followed by the ip cef distributed global configuration command on the
Cisco 7500 series router. End-to-end connectivity is restored after this workaround is performed.
•
CSCdw52267
Symptoms Packets that are supposed to be routed to another router are dropped from an interface on
a Cisco 12000 series Engine 1 line card.
Conditions This symptom is observed when you configure explicit null labels on an interface.
Workaround There is no workaround.
•
CSCdw53200
Symptoms Incoming tag packets that pass through a Packet-over-SONET (POS) or Gigabit Ethernet
interface are counted double after fragmentation.
Conditions This symptom is observed when packet sizes of incoming packets are larger than the
maximum transmission unit (MTU) size. There is no impact on packet forwarding.
Workaround There is no workaround.
•
CSCdw54940
Symptoms Outgoing labels become untagged in the Tag Forwarding Information Base (TFIB) when
a traffic engineering (TE) tunnel goes down.
Conditions This symptom is observed on router that is running Cisco IOS Release 12.0(20.3)ST3,
Release 12.0(20.4)ST, Release 12.2(7.6), or Release 12.2(7.4)T.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2130
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
This situation may occur between two label switching routers that have the Label Distribution
Protocol (LDP)/Tag Distribution Protocol (TDP) configured on a one-hop tunnel and also on a
physical link. When the tunnel goes down, the outgoing label for a prefix that is reachable via a
physical link may become untagged.
Workaround Enter the clear ip route network command, where the network argument is the IP
address of the TFIB entry that became untagged.
•
CSCdw55605
Symptoms A Cisco 10000 series edge services router misses an entry in its label forwarding table
for a prefix that belongs to a Virtual Private Network (VPN) routing/forwarding (VRF) instance.
Conditions This symptom is observed on a a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(20.3)ST2 or a later release and that is configured as a Multiprotocol Label
Switching (MPLS) Virtual Private Network (VPN) provider edge (PE).
If you enter the show tag-switching forwarding-table command for the missing entry, no label is
shown. However, if you enter the show ip cef detail command for the prefix, the correct label is
shown.
Workaround There is no workaround. However, if you enter the clear ip route command for the
affected prefix, the prefix is reinstalled in the label forwarding table.
•
CSCdw55955
This caveats consists of two issues:
Symptoms Issue 1 A packet that is traveling through a PA-MC-STM1 interface is counted twice in
the NetFlow statistics.
Conditions Issue 1 This symptom is observed when you enable the Egress NetFlow feature on a core
PA-MC-STM1 interface of an Multiprotocol Label Switching (MPLS) network using the mpls
netflow egress command-line interface (CLI) command.
Workaround Issue 1 The Egress NetFlow feature is not a feature that should be used on core MPLS
interfaces. This feature should be enabled only on interfaces that support MPLS Virtual Private
Network routing/forwarding (VRF) instances. Enabling it on any other interface should be
considered a misconfiguration. Remove the CLI configuration by entering the no mpls netflow
egress command on the offending core MPLS interface.
Symptoms Issue 2 The Egress NetFlow feature does not run properly if you use it on Cisco Express
Forwarding (CEF) (that is, if you have CEF enabled by entering the ip cef CLI command).
Conditions Issue 2 This symptom is observed when the Egress NetFlow feature is enabled on an
interface that supports an MPLS VRF instance and that is connected to an MPLS core via a
PA-MC-STM1 interface on a Cisco 7500 router that is running Cisco IOS Release 12.0(20.3)ST2.
Workaround Issue 2 Enable distributed CEF (dCEF) using the ip cef distributed CLI command.
•
CSCdw58450
Symptoms A Border Gateway Protocol (BGP) session gets dropped from an IP Services Engine
(ISE) interface because of a TCP sequence error.
Conditions This symptom is observed when you use the bgp-policy destination ip-prec-map
command and the bgp-policy destination ip-qos-map command to enable Quality of Service (QoS)
Policy Propagation via Border Gateway Protocol (QPPB) on an ISE interface.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2131
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw59802
Symptoms 100 Kpps IPv6 traffic with packet sizes larger than 500 bytes cannot pass through a 4-port
OC-48 Packet-over-SONET (POS) or enhanced 4-port OC-48 POS line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdw59938
Symptoms A label switch controller (LSC) reloads if an interface on a downstream router is shut
down.
Conditions This symptom is observed when LSCs are configured to use the Tag Distribution
Protocol (TDP). The output label switched controlled virtual circuit (LVC) is torn down after the
downstream interface is shut down. If the routing protocol has not converged, a new output LVC
request is sent to the downstream router using the same interface. When the routing update occurs,
the requested output LVC is deleted and the input LVC is released. After the input LVC is released,
the LSC will reload if it attempts to delete the output LVC.
Workaround There is no workaround.
•
CSCdw60124
Symptoms If an ATM tag switching subinterface is created and the multi-virtual circuit (Multi-VC)
mode is enabled on the subinterface, the local prefixes of a Label Distribution Protocol (LDP)
neighbor do not appear in the label forwarding table if the subinterface is deleted and subsequently
recreated.
Conditions This symptom is observed on a Cisco router that is configured with a Route Switch
Processor 4 (RSP4).
Workaround Reload the router.
•
CSCdw60620
Symptoms If you enter the no ip vrf vrf-name command on a provider edge (PE) router, the deleted
Virtual Private Network (VPN) routing/forwarding (VRF) table is not removed from the router. If
you enter the show ip vrf command, the VRF table shows up as “being deleted.” This situation
prevents you from configuring a VRF table with same route distinguisher.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdw61086
Symptoms The following Simple Network Management Protocol (SNMP) MIB components do not
accurately reflect the interface state on an Engine 3 1-port channelized OC-48 Packet-over-SONET
line card:
– sonetSectionCurrentStatus
– sonetLineCurrentStatus
– sonetPathCurrentStatus
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2132
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw63013
Symptoms If the ipv6 router rip global configuration command is issued after the ip access-list
global configuration command has been issued, the entry of subsequent IPv6 redistribute router
configuration commands fails.
Conditions This symptom is observed after the router reloads. The redistribute router configuration
command is present in the startup configuration but not the running configuration.
Workaround Reissue the missing redistribute router configuration command.
•
CSCdw64288
Symptoms A router gets into a perpetual loop while autobooting is attempted.
Conditions This symptom is observed when the first file on the bootflash is not a working
bootloader, the config-register command is set to 1 (that is, autoboot), and you reload the router.
Workaround Replace the NVRAM.
Alternate Workaround Replace the boot ROM with version 182 or a higher version.
•
CSCdw64740
Symptoms Tag switching advertise tags do not work when Tag Distribution Protocol (TDP) is
toggled between the tag-switching advertise-tags global configuration command and the no
tag-switching advertise-tags global configuration command.
Conditions This symptom is observed when Cisco IOS Release 12.2(7.6)T or
Release 12.0(20.3)ST3 is used and does not occur when the Label Distribution Protocol (LDP) is
used.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the interface that has the TDP session configured.
•
CSCdw66742
Symptoms After a card is removed and a router is reloaded, the ifindex values are changed.
Conditions This symptom is observed on a Cisco 12000 series Internet router after you have
configured the snmp ifindex persist command for each interface and you have also configured the
snmp-server ifindex persist command, and then you use the copy EXEC command to paste the
ifindex values in NVRAM.
Workaround There is no workaround.
•
CSCdw67208
Symptoms Label Distribution Protocol (LDP) that is configured on a provider edge (PE) router does
not advertise a changed label to customer edge (CE) routers. The CE routers continue to work an old
label for the prefix. If you enter the show mpls forwarding-table command on the CE and PE
routers, the old label will be returned:
– Use the show mpls forwarding-table ldp binding command on the CE routers.
– Use the show mpls forwarding-table ldp binding vrf vrf-name command on the PE router.
Conditions This symptom is observed when the LDP-based Carrier Supporting Carrier feature is
configured on a Virtual Private Network (VPN) routing/forwarding (VRF) interface of a provider
edge (PE) router and the Border Gateway Protocol (BGP) reallocates a new label for a VPN prefix.
Workaround Clear the LDP session between the PE router and the CE routers by entering the
shutdown command followed by no shutdown command on the VRF interface of the PE router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2133
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw67480
Symptoms NetFlow stops functioning on a line card.
Conditions This symptom is observed when you first configure sampled NetFlow and multicast
hardware switching on the same line card and then disable multicast hardware switching.
Workaround Reload microcode onto the line card.
•
CSCdw67561
Symptoms Border Gateway Patrol (BGP) silently ignores a password that has fewer than four
characters but does not authenticate the BGP session. If you enter the show configuration
command, the ignored password is displayed.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround Use a password that has more than four characters.
•
CSCdw67882
Symptoms The explicit-null label is not advertised by Tag Distribution Protocol (TDP).
Conditions This symptom is observed when TDP is configured between a router that is running
Cisco IOS Release 12.2(7.6)T, Release 12.0(20.3)ST3, or Release 12.0(20.4)ST and another router
and the mpls ldp explicit-null command is also configured.
Workaround Use Label Distribution Protocol (LDP) instead of TDP.
Alternate Workaround Reset the TDP session after you have configured the mpls ldp explicit-null
command. Whenever you change the explicit-null label configuration, you will need to reset the
TDP session. To reset the TDP session, enter the shutdown command followed by no shutdown
command on the link that is running TDP.
•
CSCdw67901
Symptoms The framing and clock source default parameters of a Cisco 10000 series 24-port
channelized E1/T1 line card do not match the framing and clock source settings that are displayed
by the Cisco IOS software. This situation may cause the controller state of the line card to remain
down.
Conditions This symptom is observed when Cisco IOS software expects the default configuration of
the 24-port channelized E1/T1 line card to be set to cyclic redundancy check 4 (CRC4) framing and
the clock source to be set to line, but the chips of the line card are actually set to different values.
Workaround First use the clock source command to set the clock source to line and the framing
command to select the desired framing, and then enter the shutdown command followed by no
shutdown command on the controller of the line card.
Alternate Workaround Use the no framing command to turn off framing and the channel-group
command to define the time slot.
•
CSCdw67925
Symptoms When you remove an interface on a 2-port STM-1/OC-3 channelized DS1/E1 line card
from a multilink group, the following error message is displayed:
%GRP-3-ENCAP: Failure to Update (mac length non-0), slot 4294967295 (info 0x4)
-Traceback= 5029E8DC 5029F1DC 50101C7C 501022D4 500F8E24 500F9B80 500F9C04 501A6F9C
5019C6D0 5019C780 5019D400 501BE90C 501BE8F8
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz.image of Cisco IOS Release 12.0(20.4)ST.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2134
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw67963
Symptoms A Multiprotocol Label Switching (MPLS) committed access rate (CAR) rule limits the
rate of multicast packets.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdw67991
Symptoms A Cisco 12000 series line card reloads when traffic comes through and you have both the
police bps command and the priority command configured in the same class.
Conditions This symptom is observed on Cisco 12000 series IP Services Engine (ISE) OC-48 line
cards and ISE Channelized OC-48 line cards that are running the gsr-p-mz image of Cisco IOS
Release 12.0(20.4)ST.
Workaround There is no workaround.
•
CSCdw68089
Symptoms Incoming and outgoing Committed Access Rate (CAR) does not function for
Differentiated Services Code Point (DSCP)-based rules.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdw68437
Symptoms A Virtual Private Network (VPN) routing/forwarding (VRF) ping does not work with an
Engine 0 line card.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdw69768
Symptoms A headend edge label switch router (ELSR) may generate unsynchronized tag bindings
and display the following error message:
%SCHED-3-THRASHING: Process thrashing on watched managed timer (0x414A4920).
-Process= "TC-ATM Proc", ipl= 4, pid= 88 -Traceback= 40398AC0 40398EC0 4099DF14
Conditions These symptoms are observed in a cell-based Multiprotocol Label Switching (MPLS)
setup. These symptoms are observed on the headend ELSR after the tailend of an ELSR Tag
Distribution Protocol (TDP) or Label Distribution Protocol (LDP) session is toggled. These
symptoms occur because the headend ELSR does not clean up all tag bindings completely after the
TDP or LDP session goes down. The headend ELSR keeps the state of some of the stale tag bindings
as active.
Workaround When this symptom occurs, the user can toggle the headend TDP or LDP session by
issuing the shutdown interface configuration command followed by the no shutdown interface
configuration command either on the extended tag ATM (XTagATM) interface either on the label
switch controller (LSC) or on the MPLS subinterface on the headend ELSR.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2135
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw70206
Symptoms If you use a 3-port Gigabit Ethernet line card as the Universal Transport Interface (UTI)
customer facing interface configured for UTI-raw, the length of the packet that is received at the
remote end is always 4 bytes longer than the length of the packet that is sent.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(20.4)ST.
Workaround There is no workaround.
•
CSCdw70627
Symptoms After a Cisco 12000 series Internet router has booted up, a line card reloads, many
messages that are related to the reloaded line card are displayed, and the router pauses twice.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdw70886
Symptoms A Line Remote Defect Indicator (LRDI) condition may not manifest itself as an alarm.
Conditions This symptom is observed on an OC-3 or OC-12 Packet-over-SONET (POS) line card.
Workaround There is no workaround.
•
CSCdw71419
Symptoms The ciscoFlashFileTable loops during a Simple Network Management Protocol (SNMP)
walk.
Conditions This symptom is observed on a Cisco 6400 Node Switch Processor (NSP) when you
create a file in a Personal Computer Memory Card International Association (PCMCIA) device
without rebooting the NSP.
Workaround There is no workaround.
•
CSCdw71679
Symptoms Running IPv6 Border Gateway Protocol (BGP) across an automatic tunnel that uses an
IPv4-compatible IPv6 address does not work correctly.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdw74098
Symptoms The performance of Sampled NetFlow is negatively affected.
Conditions This symptom is observed on Cisco 12000 series Engine 2 and Engine 3 line cards that
use suboptimal software vectors to forward or process packets that are punted from the hardware
switching path to the software.
Workaround There is no workaround.
•
CSCdw74143
Symptoms A Cisco 7500 series Route Switch Processor (RSP) reloads when a policy map is
associated to a Frame Relay map class.
Conditions This symptom is observed on a router that has 380 interfaces configured and each
interface has distributed Frame Relay fragmentation (dFRF.12) configured.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2136
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw74632
Symptoms An alarm indication signal (AIS) count is detected on the far end of a PPP encapsulated
link if you remove the Rx fiber on the near end.
Conditions This symptom is observed on an OC-12 Packet-over-SONET (POS) or OC-3 POS line
card that has PPP encapsulation enabled.
Workaround There is no workaround.
•
CSCdw76355
Symptoms Using the clear isis * EXEC command prevents some tunnels that have autoroute enabled
to be used by the Intermediate System-to-Intermediate System (IS-IS) in its Shortest Path First
(SPF) or next hop calculations.
Conditions This symptom is observed when Multiprotocol Label Switching (MPLS) Traffic
Engineering (TE) is configured along with IS-IS and occurs only for tunnels for which Fast-Reroute
has been enabled using the tunnel mpls traffic-eng fast-reroute command.
Workaround Administratively disable and then reenable the tunnel by entering the shutdown
command followed by the no shutdown command on the tunnel interface.
•
CSCdw76822
Symptoms IP connectivity may be disrupted after distributed Cisco Express Forwarding (dCEF) is
configured on a router.
Conditions This symptom is observed on a Cisco 7500 series router that is functioning as a provider
edge (PE) router and that is running tag switching or Multiprotocol Label Switching (MPLS). This
symptom occurs if the router is running both cell-based and frame-based tag switching
simultaneously.
Workaround There is no workaround.
•
CSCdw77323
Symptoms Cisco 10000 series Performance Routing Engine (PRE) software reloads when you apply
a service policy command to a multilink interface.
Conditions This symptom is observed when the multilink interface has no active links (which is the
case when the system restarts) and the policy map contains a bandwidth, priority, or shape
command.
Workaround Apply the service policy command after you have ensured that the multilink interface
has at least one active link.
•
CSCdw79275
Symptoms Multicast hardware switching does not function on Frame Relay subinterfaces.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdw80326
Symptoms Entering the no access-list 101 command in configuration mode causes a router to reload
because of a bus error.
Conditions This symptom is observed when comments along with dynamic access control entries
(ACEs) are used in the access control list (ACL) that is being removed.
Workaround Do not use comments for dynamic ACEs in an ACL. Comments for nondynamic ACEs
do not cause the symptoms to occur.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2137
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw80397
Symptoms When you configure cyclic redundancy check 4 (CRC4) framing on a Cisco 10000 series
24-port channelized E1 line card after the line card had been configured for non-CRC4 framing, the
E1 controller state of the line card goes down and the E1 controller reports a Loss of Frame failure.
This situation causes the interface and the line protocol to go down.
Conditions This symptom is observed when you connect the controllers of two 24-port channelized
E11 line cards back-to-back and in a configuration in which the controller of a 24-port channelized
E1 line card is connected to a test device.
Workaround Enter the loopback local controller configuration command followed by the no
loopback controller configuration command on the E1 controller to recover from the situation.
•
CSCdw80564
Symptoms The Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) feature does
not function.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(20.4)ST.
Workaround There is no workaround.
•
CSCdw80828
Symptoms Tag Distribution Protocol (TDP) does not advertise a tag.
Conditions This symptom is observed in Cisco IOS Release 12.2(7.6)T, Release 12.0(20.3)ST3, or
Release 12.0(20.4) ST when TDP is running between two routers and the state of a Tag Information
Base (TIB) entry changes quickly from “withdrawn” to “assigned.” This situation may occur under
stress when a large routing change takes place.
Workaround Reset the TDP session by entering the shutdown interface configuration command
followed by the no shutdown interface configuration command on the interface on which the TDP
session is configured.
Alternate Workaround
•
Use Label Distribution Protocol (LDP) instead of TDP.
CSCdw81063
Symptoms A Cisco 10000 series edge services router cannot act as the head or tail of a generic
routing encapsulation (GRE) tunnel that carries Multiprotocol Label Switching (MPLS)
encapsulated traffic.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdw81118
Symptoms Subinterfaces on a serial interface have incorrect subinterface names.
Conditions This symptom is observed when a Packet-over-SONET (POS) interface that has
subinterfaces configured is rechannelized to a serial interface; the subinterfaces on the new serial
interface will have incorrect subinterface names. The same situation occurs when a serial interface
that has subinterfaces configured is rechannelized to a POS interface.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2138
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw81227
Symptoms A router reloads when you set ifAdminStatus using Simple Network Management
Protocol (SNMP).
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround Use the shutdown command-line interface (CLI) command followed by the no
shutdown CLI command to control the administrative status.
•
CSCdw82106
Symptoms An implicit-null label over a Border Gateway Protocol (BGP) RFC 3107 session is
distributed as a “1” rather than as a “0.”
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdw82241
Symptoms After a multiprotocol external Border Gateway Protocol (MP-eBGP) update, if you enter
the show mpls forwarding-table command, the VPN labels that are shown do not match the VPN
labels that are shown if you enter the show ip bgp vpnv4 all command.
Conditions This symptom is observed in a network configuration with the following characteristics:
– Several Cisco 12000 series Internet routers function as provider (P) and provider edge (PE)
routers.
– At least one Cisco 12000 series Internet router functions as a PE autonomous system border
router (ASBR).
– All Cisco 12000 series Internet routers are configured with 8-port Packet-over-SONET (POS)
and 3-port Gigabit Ethernet line cards.
– The routers function in an interautonomous system Multiprotocol Label Switching (MPLS)
Virtual Private Network (VPN) environment.
Workaround Enter the clear ip bgp * command on the router that functions as the PE-ASBR.
•
CSCdw83686
Symptoms A Cisco 10000 series edge services router (ESR) reloads the Cisco IOS software.
Conditions This symptom is observed when the microcode on a Cisco 10000 series ESR is reloaded
repeatedly (hundreds or thousands of times). The microcode should be reloaded only in the case of
a PFX reload, which is rare.
Workaround There is no workaround.
•
CSCdw85160
Symptoms The E1 controller of a Cisco 10000 series 24-port channelized E1 is down.
Conditions This symptom is observed when you connect the controllers of two 24-port channelized
E11 line cards back-to-back in a non-cyclic-redundancy-check-4 (CRC4) framing configuration.
The controller at one end of the link is in an “Up” state, and its interface and line protocol are also
up. The neighboring controller at the other end of the link is in a “Down” state, and entering the
loopback local controller configuration command followed by the no loopback controller
configuration command on the E1 controller that is in the “Down” state has no effect.
Workaround Enter the loopback local controller configuration command followed by the no
loopback controller configuration command on the E1 controller that is in the “Up” state.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2139
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdw85311
Symptoms A Cisco 10000 series edge services router (ESR) performs an emergency shutdown.
Conditions This symptom occurs on a Cisco 10000 series ESR that is running Cisco IOS
Release 12.0(21)SX two minutes after a fan failure or fan removal.
Workaround Ensure that there is at least one working fan present in the fan tray.
•
CSCdw85655
Symptoms Packets get dropped intermittently when Virtual Private Network (VPN)
routing/forwarding (VRF) instances are configured.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is configured with
a Performance Route Processor (PRP).
Workaround There is no workaround.
•
CSCdw85724
Symptoms CPU utilization on a Cisco 12000 series IP Services Engine (ISE) line card is 99 percent
and a fabric ping failure causes a line card to reload.
Conditions These symptoms are observed on a 16-port channelized OC-3/STM-1 to DS-3/E3 ISE
line card that is configured for 48 DS3’s and that is connected to an Engine 2 16-port
Packet-over-SONET (POS) line card. This configuration is incorrect because an Engine 2 line card
does not support channelization to DS3.
The New SONET Pointer (NEWPTR) counter of the 16-port channelized OC-3/STM-1 to DS-3/E3
ISE line card cannot be tracked precisely because there is no NEWPTR hardware counter and the
NEWPTR interrupt cannot be enabled for system reliability consideration.
Workaround There is no workaround.
•
CSCdw86488
Symptoms A Multi Frame (MFR) bundle does not recover.
Conditions This symptom is observed after a 6-port channelized T3 (6CT3-SMB) line card that is
configured for MFR and that is installed in a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)S1 has reloaded.
Workaround Reload microcode onto the line card.
•
CSCdw86740
Symptoms The service policy overruns the interprocess communications (IPC) mechanism on a
Cisco 7500 series router.
Conditions This symptom is observed when a service policy is applied to a large number of
interfaces simultaneously.
Workaround Break up the service policy and apply the service policy individually to a smaller group
of interfaces.
•
CSCdw88175
Symptoms The eboot image cannot read the configuration that was saved to NVRAM when a
Cisco 10000 series edge services router (ESR) is booting up.
Conditions This symptom is observed on a Cisco 10000 series ESR that is running Cisco IOS
Release 12.0(21)SX when the eboot image is an earlier image than Release 12.0(21)SX and the
Auto-Shutdown feature causes the router to shut down because of a fan failure, fan removal, or
overheating condition that lasts longer than two minutes.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2140
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Workaround Upgrade the eboot image to Cisco IOS Release 12.0(21)SX and ensure that both the
router and the eboot image run Cisco IOS Release 12.0(21)SX.
•
CSCdw88747
Symptoms An Engine 4 (E4) or Engine 4 Plus (E4+) line card stops responding and may be reset by
the Route Processor.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(22)S or an earlier release if distributed multicast routing is enabled in the
router.
Workaround There is no workaround.
•
CSCdw89864
Symptoms Quality of service (QoS) traffic classes that should receive fair or priority treatment fail
to receive such services.
Conditions This symptom is observed if you use a QoS service policy with class-based fair queueing
or priority queueing features on a Multilink PPP (MLP) interface and you enter the service-policy
command before all PPP links come up in an MLP bundle.
Workaround Manually apply the service-policy command after you have ensured that the multilink
bundle is fully connected.
•
CSCdw90505
Symptoms When you change an outgoing Virtual Private Network (VPN) routing/forwarding (VRF)
subinterface in one VPN to High-Level Data Link Control (HDLC) encapsulation, another outgoing
VRF subinterface in a different VPN does not forward traffic.
Conditions This symptom is observed in a configuration in which a provider edge (PE) router and a
customer edge (CE) router are connected through a Cisco 12000 series Engine 2
Packet-over-SONET interface.
Workaround There is no workaround.
•
CSCdw90589
Symptoms A Cisco 10720 Internet router reloads with the following error message:
%Camr-3-MISTRAL_ERROR:MISTRAL_TM_NPP_PAR_ERR_REG_MASK_HI: 41
-Traceback= 5022DA50 501DE2A8
%Camr-3-INTPROC: Process Traceback= 5022CC18 501DDF8C
-Traceback= 5022D6C8 5022DB74 501DE2A8
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdw91017
Symptoms A Cisco 12000 series Engine 2 line card stops forwarding all traffic.
Conditions This symptom is observed when an interface of the Engine 2 line card is performing IP
to tag imposition and you apply unicast Reverse Path Forwarding (uRPF) strict check under this
interface.
Workaround There is no workaround.
•
CSCdw92892
Symptoms The Frame Relay (FR) functionality on an OC-3 Packet-over-SONET (POS) and OC-12
POS interface do not work; the loopback (LP) may not come up, and Local Management Interface
(LMI) “enq” and “stat” messages may not be exchanged between the FR data terminal equipment
(DTE) and data circuit-terminating equipment (DCE).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2141
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(20)ST1 or Release 12.0(20)ST2.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the main POS interface on the FR DTE side. This sequence of
commands causes the router on the DTE side to start sending LMI “enq” messages and,
subsequently, causes the router on the DCE side to start sending LMI “stat” messages.
•
CSCdw94531
Symptoms A T1 interface and its channel or channels fail to come back up.
Conditions This symptom is observed on a 6-port channelized T3 line card in channelized mode with
a connected channel group, if you enter the shutdown command on the controller, perform an online
insertion and removal (OIR) of the line card, and then enter the no shutdown command on the
controller.
Workaround Perform an additional OIR of the line card.
•
CSCdw94613
Symptoms An Engine 2 line card reloads unexpectedly or experiences alignment errors.
Conditions These symptoms are observed on an Engine 2 line card in a Cisco 12000 series Internet
router that is running an interautonomous system Virtual Private Network (VPN) with traffic across
Multiprotocol Label Switching (MPLS) links that are load-balanced, when external Border Gateway
Protocol (eBGP) routes start to enter across the interautonomous system VPN.
Workaround There is no workaround.
•
CSCdw94648
Symptoms Pings through Multilink PPP (MLP) interfaces fail.
Conditions This symptom is observed on interfaces of a Cisco 10000 series 24-port channelized
E1/T1 line card.
Workaround There is no workaround.
•
CSCdx00697
Symptoms Border Gateway Protocol (BGP) peering between two or more links on a Cisco 10000
series edge services router via a serial T1 connection does not load-balance correctly. If you use the
BGP configuration with external BGP (eBGP) multihop and a configured number of host static
routes, load-balancing fails.
Conditions These symptoms are observed when the Per-Packet Load Balancing (PPLB) is
configured.
Workaround Configure static routes for the networks that a customer is advertising via BGP to the
next-hop links of the router.
•
CSCdx00934
Symptoms A ping fails within a Virtual Private Network (VPN).
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(20.4)ST1 when a customer edge (CE)-provider edge
(PE) link is configured as a Frame Relay link.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2142
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx01917
Symptoms Serial interfaces on a Cisco 10000 series 1-port channelized OC-12 line cards remain in
a Down/Down state after the router has reloaded and the interfaces are defined in the startup
configuration.
Conditions This symptom is observed when the startup configuration contains a large number of
serial interfaces that are defined on multiple 1-port channelized OC-12 line cards.
Workaround Delete and recreate the affected interfaces.
•
CSCdx02036
Symptoms If the prefix of a provider edge (PE) router is learned over a Packet-over-SONET (POS)
interface, the prefix is untagged.
Conditions This symptom is observed in a Carrier Supporting Carrier (CsC) topology in which two
Cisco PE routers are connected to a POS interface. The prefix of the PE router is untagged after the
topology is configured if the prefix is learned over a POS interface. When this symptom occurs,
traffic forwarding through the CsC core is stopped.
Workaround Manually clear the prefix from the routing table and establish a tag for the prefix.
•
CSCdx02559
Symptoms An Engine 3 line card reloads with a bus error exception.
Conditions This symptom is observed when you configure a large number of subinterfaces and
Virtual Private Networks (VPNs) on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx02945
Symptoms A Cisco 12000 series Internet router reloads if a Multiprotocol Label Switching (MPLS)
Traffic Engineering (TE) tunnel is configured with the following sequence of commands:
sam4(config)# no int tunnel200
sam4(config)# interface Tunnel200
sam4(config-if)# ip unnumbered Loopback0
sam4(config-if)# tunnel destination 1.1.1.1
sam4(config-if)# tunnel mode mpls traffic-eng
sam4(config-if)# no tunnel mpls traffic-eng autoroute announce
sam4(config-if)# tunnel mpls traffic-eng priority 0 0
sam4(config-if)# tunnel mpls traffic-eng bandwidbth 300
sam4(config-if)# tunnel mpls traffic-eng fast-reroute
sam4(config-if)# tunnel mpls traffic-eng path-option 1 explicit name sam1
sam4(config-if)# no shut
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdx04150
Symptoms Packets are not forwarded from an Engine 4 (E4) line card to an Engine 3 (E3) or
Engine 4 Plus (E4+) line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router when you configure
an output access control list (ACL) on an E3 or E4+ line card.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2143
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx04487
Symptoms An enhanced 4-port OC-12 Packet-over-SONET (POS) line card may repeatedly report
the following error message:
SLOT 6:Mar 14 09:49:23 MET: %LCPOS-3-SOP: RX:UnexpectedSop. Source=0x4 (Framer),
halt_minor0=0x8000
SLOT 6:Mar 14 09:49:23 MET: %GSR-3-INTPROC: Process Traceback= 400C8E08 400C4730
40010A24
-Traceback= 402EF7E4 40620744 400C3F0C
A SONET synchronization difficulty may precede the error message. The line protocol goes down
on the affected interface and if the affected interface is not shut down, the line card will eventually
be reloaded by the router because of internal ping timeouts and the following error message will
appear:
%GRP-3-COREDUMP: Core dump incident on slot 6, error: Fabric ping failure (seq:502605)
Conditions These symptoms are observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0 (19)S1.
Workaround There is no workaround.
•
CSCdx05010
Symptoms A Route Processor Module (RPM) interface may not work after it is reloaded.
Conditions This symptom is observed on a Cisco MGX8250 RPM if two or more subinterfaces are
configured with the same ATM permanent virtual connection (PVC) name that uses identical
characters for the first 15 characters.
Workaround Configure ATM PVC names that are unique and that have 15 characters or fewer.
When the Cisco MGX8250 is first configured, multiple subinterfaces can be configured with a PVC
that is 15 characters if the characters are unique. However, if the first 15 characters are identical after
a reload, other subinterfaces fail because only one subinterface retains the PVC statement.
•
CSCdx05980
Symptoms Two customer edge (CE) routers that are connected to the same provider edge (PE) router
cannot ping each other.
Conditions This symptom is observed when two Cisco 12000 series Internet routes that are
functioning as CE routers are connected to a Cisco 12000 series Internet router that is functioning
as a PE router via Engine 3 line cards.
Workaround There is no workaround.
•
CSCdx07572
Symptoms When you enter the no shutdown interface configuration command to bring up a spatial
reuse protocol (SRP) interface, a router reloads.
Conditions This symptom is observed on Cisco 7200 series and Cisco 7500 series routers that are
running Cisco IOS Release 12.0(21.1)S3.
Workaround There is no workaround.
•
CSCdx07801
Symptoms You cannot configure an external Border Gateway Protocol (eBGP) neighbor with an
IPv4 send-label option under the address-family ipv4 vrf vrf-name command as part of the router
bgp as-number configuration.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2144
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed in a carrier supporting carrier environment between a provider
edge (PE) and a customer edge (CE) router.
Workaround Use Label Distribution Protocol (LDP) as the protocol between the PE router and the
CE router.
•
CSCdx08669
Symptoms A Cisco 7500 series router experiences spurious memory accesses and reloads with a bus
error.
Conditions This symptom is observed on a Cisco 7500 series router that is running the rsp-pv-mz
image of Cisco IOS Release 12.0(16)ST and that has Multiprotocol Label Switching (MPLS)
enabled. This situation is related to the use of the aggregate-address Border Gateway Protocol
(BGP) command.
Workaround There is no workaround.
•
CSCdx09803
Symptoms A customer edge (CE) router does not learn prefixes from a provider edge (PE) router.
The neighbor session comes up with a “send-label” that is correctly configured but the Network
Layer Reachability Information (NLRI) that is received by the CE router is rejected because of
incorrect Subsequent Address Family Identifier (SAFI) information.
Conditions This symptom is observed when the MPLS VPN Carrier Supporting Carrier—IPv4 BGP
Label Distribution feature is configured between the CE router and the PE router and the external
Border Gateway Protocol (eBGP) is being used.
Workaround There is no workaround.
•
CSCdx10517
Symptoms A Cisco 12000 series Internet router loses IPv6 addresses after the Route Processor (RP)
reloads.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running IPv6
on an 8-port OC-3/STM-1 ATM line card that is configured with subinterfaces that use permanent
virtual connection (PVC) ATM Adaptation Layer 5 Subnetwork Access Protocol (AAL5 SNAP)
encapsulation.
Workaround There is no workaround.
•
CSCdx11084
Symptoms An ATM OC-12 interface on a Cisco 7500 series port adapter shows output drops that
cannot be accounted for anywhere else in the router. None of the permanent virtual connections
(PVCs) show any drops, but the interface still accumulates drops.
Conditions This symptom is observed when the traffic rate is very low compared to line rate of the
port adapter.
Workaround There is no workaround.
•
CSCdx11194
Symptoms The show running-config command does not display the correct configuration for some
E1 lines on a Cisco 10000 series edge services router, which causes failures when the router reloads
or a Performance Routing Engine (PRE) performs a switchover.
Conditions This symptom is observed when E1 lines on a channelized STM-1 card are set to
non-cyclic-redundancy-check-4 (CRC4) framing, that is, when the no-crc4 command is enabled. No
failures occur when all E1 lines on the router are configured for non-CRC4 framing.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2145
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx11208
Symptoms Network control traffic is dropped from a Cisco 10720 series router.
Conditions This symptom is observed on a Cisco 10720 series router that is running Cisco IOS
Release 12.0(21)ST or Release 12.0(20)SP and that is subjected to a heavy traffic load. Any
configuration in which network control traffic can be sourced by a Cisco 10720 series router can
exhibit this problem.
Workaround There is no workaround.
•
CSCdx11581
Symptoms A local provider edge (PE) router can learn remote customer edge (CE) routes, but pings
do not go through the routes.
Conditions This symptom is observed in an Virtual Private Network (VPN) interautonomous system
environment.
Workaround There is no workaround.
•
CSCdx11690
Symptoms A Cisco 12000 series Internet router that is configured with an ATM line card cannot
ping a neighbor after a Stateful Switchover (SSO).
Conditions This symptom is observed after the active and the standby Router Processor (RP) are
fully initialized, an ATM permanent virtual connection (PVC) is reconfigured manually, and the
reconfigured PVC is deleted from the standby RP. This situation causes the new active RP to have
an invalid channel identification (ID) for communication with the segmentation and reassembly
(SAR) component of the ATM line card.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the ATM interface or subinterface.
•
CSCdx12501
Symptoms A switch VLAN may come up when its first port comes up. If there is a delay in
subsequent switch ports coming up in the same VLAN, a Hot Standby Router Protocol (HSRP)
group on that VLAN may become active before receiving any packets from other HSRP groups on
the subnet. If HSRP PREEMPT is not configured, this behavior is unexpected.
Conditions This symptom is observed when configuring HSRP between two CATALYST 6000
switches that are running Cisco IOS Release 12.1(8b)E9 and when removing PREEMPT from the
configurations of the respective VLANs.
Workaround Configure longer HSRP Hold and Hello timers.
•
CSCdx12620
Symptoms The protocol control information (PCI) master aborts, and a Cisco 10000 series edge
services router (ESR) reloads. The following error message is displayed:
Router(boot)#sh diag %ERR-1-GT64120 (PCI-1): Fatal error, PCI Master abort
GT=0xB4000000, cause=0x00000400, mask=0x00D01D00, real_cause=0x00000400
bus_err_high=0x00000000, bus_err_low=0x00000000, addr_decode_err=0x00000470
%ERR-1-FATAL: Fatal error interrupt, reloading RP FPGA status 0x00000004 EPC
0x60114510 Error EPC 0x6FEF7DFD BadVA 0x0069504B Status 0x3400FF03
Conditions These symptoms are observed when you enter the show diag command from the eboot
software image on the Cisco 10000 ESR.
Workaround Use the show diag command from a full software image.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2146
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx12759
Symptoms A standby Gigabit Route Processor (GRP) reloads after bootup of the router.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is configured with
a redundant Gigabit Route Processor (GRP) that is booted with the gsr-p-mz software image of
Cisco IOS Release 12.0(21)ST.
Workaround There is no workaround.
•
CSCdx13418
Symptoms All Cisco 12000 series line cards reload when you perform an online insertion and
removal (OIR) by replacing one line card with another one in the same slot. The following error
message (where slot 5 is the slot in which the OIR was performed) is displayed:
SLOT 5:00:02:14: %MDS-2-LC_INVALID_HWIDB_INDEX: Invalid if_index for HWIDB
GigabitEthernet5/0 SLOT 5:00:02:14: %MDS-2-LC_INVALID_SWIDB_IFNUM: Invalid if_num for
SWIDB GigabitEthernet5/0
Conditions This symptom is observed after a Route Processor Redundancy Plus (RPR+) switchover
or a Stateful Switchover (SSO).
Workaround Reload the router.
•
CSCdx13597
Symptoms A router reloads when you enter the show tag-switching tdp neighbors command.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx16309
Symptoms A router reloads when you remove both a tunnel interface that is running in IPv6 mode
and the loopback interface that has the tunnel interface as its source.
Conditions This symptom is observed on a router that is running Cisco IOS Release 12.0(20.3)ST2.
Workaround There is no workaround.
•
CSCdx16684
Symptoms A secondary Route Processor (RP) reloads not long after a Stateful Switchover (SSO)
occurs.
Conditions This symptom is observed in a configuration that contains traffic engineering tunnels.
Workaround There is no workaround.
•
CSCdx16714
Symptoms A Route Processor (RP) may experience a bus error or pause indefinitely when a crash
test is performed.
Conditions This symptom occurs after the test crash command is issued on an active RP.
Workaround Reload or power-cycle the router.
•
CSCdx16872
Symptoms Traffic loss occurs because of buffer depletion drops.
Conditions This symptom is observed when there is bidirectional traffic across a number of
Multilink PPP (MLPPP) bundles, the router is reloaded, and the configuration that was present prior
to the reload is copied to the running configuration. Under these conditions, there are packet buffer
leaks relative to the number of active bundles and the traffic presented to them.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2147
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx17352
Symptoms When a line card of a provider edge (PE) router that is running IPv6 in a Multiprotocol
Label Switching (MPLS) environment (also referred to as a 6PE router) is reloaded or a line card
comes up after 6PE routes have already been learned and installed, the 6PE forwarding entries are
not downloaded to the line card that has been reloaded or has come up.
Conditions This symptom is observed on a Cisco 12000 series 8-port OC-3 Packet-over-SONET line
card.
Workaround There is no workaround.
•
CSCdx17568
Symptoms Multicast Border Gateway Protocol (MBGP) for address family IPv6 does not allow the
“neighbor x.x.x.x” send label to be configured and causes a provider edge (PE) router that is running
IPv6 in a Multiprotocol Label Switching (MPLS) environment (also referred to as a 6PE router) to
work incorrectly.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(21.2)S.
Workaround There is no workaround.
•
CSCdx17573
Symptoms Multiprotocol Label Switching (MPLS) does not update the Cisco Express Forwarding
(CEF) table with the new local tags after a Route Processor Redundancy Plus (RPR+) cutover
occurs.
Conditions This symptom is observed on a Cisco 7500 Route Processor (RP) that is running
Cisco IOS Release 12.0 S.
In a dual RP system, the standby RP acts as a line card to the primary RP, and all Forwarding
Information Base (FIB) and Tag Forwarding Information Base (TFIB) entries are downloaded to the
standby RP. Because the Label Distribution Protocol (LDP) is also running on the standby RP, the
LDP makes all the rewrites on the tag_info command field to be NULL. After an RPR+ cutover
occurs, the FIB does not trigger the TFIB to delete the tag_info command field because the FIB does
not detect a nontrivial change. Because of this behavior, the TFIB is associated with invalid and
NULL entries.
Workaround There is no workaround.
•
CSCdx17784
Symptoms Cisco 12000 series line cards do not come up after an online insertion and removal (OIR)
of the active Router Processor (RP).
Conditions This symptom is observed when the active RP is removed and you remove the primary
Clock and Scheduler Card (CSC) before the new active RP takes over.
Workaround Reload the router.
•
CSCdx17893
Symptoms A Cisco 12000 series Engine 3 line card reloads.
Conditions This symptom is observed when the Engine 3 line card is configured with Intermediate
System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF) as the Interior Gateway
Protocol (IGP), has many (10,000) IS-IS or OSPF routes configured and has load-balancing enabled.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2148
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx18570
Symptoms A 1-port OC-12 Packet-over-SONET (POS)-MM line card reloads repeatedly after tag
switching is configured on the POS interface.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(18)ST.
Workaround Disable tag switching.
•
CSCdx18986
Symptoms Outgoing Committed Access Rate (CAR) does not function for Multiprotocol Label
Switching (MPLS) packets. All rate-limiting configurations are ignored, and the CAR function is
bypassed.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx19023
Symptoms After you have removed the policy-map configuration, it still exists under the virtual
circuit (VC).
Conditions This symptom is observed on a Cisco 12000 series Engine 2 8-port OC-3 ATM line card.
Workaround Enter the shutdown command followed by the no shutdown command on the VC to
remove the policy-map configuration from the VC.
•
CSCdx19277
Symptoms Some packets are not switched on a Cisco 12000 series Internet router.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(21.2)S and that is configured with an Engine 4 line card
that functions as an ingress line card.
Workaround There is no workaround.
•
CSCdx20802
Symptoms Memory fragmentation may cause 2 MB of memory allocation to fail.
Conditions This symptom affects edge routers that are configured for multi-virtual circuit
(Multi-VC) and that have Label-Controlled ATM (LC-ATM) interfaces connected toward a
Multiprotocol Label Switching (MPLS) core. Incremental memory leaks occur after the LC-ATM
interface is toggled by issuing the shutdown interface configuration command followed by the no
shutdown interface configuration command or after Cisco Express Forwarding (CEF) is enabled
and later disabled on the router by issuing the ip cef global configuration command followed by the
no ip cef global configuration command. Incremental memory leaks may also be seen when route
flaps occur. If the incremental memory leaks continue, memory fragmentation may occur and traffic
may stop passing through the LC-ATM interface.
Workaround There is no workaround.
•
CSCdx20954
Symptoms A Cisco 12000 series OC-3 line card reloads unexpectedly and then recovers.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx20979
Symptoms The bandwidth bandwidth-size command is missing from the command-line interface
(CLI).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2149
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed in Cisco IOS Release 12.0(21.02)S.
Workaround Use the bandwidth percent value command.
•
CSCdx20996
Symptoms A router may reload if a configuration is changed.
Conditions This symptom is observed on a Cisco router that is running Tag Distribution Protocol
(TDP) or Label Distribution Protocol (LDP). The reload occurs when TDP or LDP is unconfigured.
Workaround There is no workaround.
•
CSCdx23088
Symptoms Sampled NetFlow (SNF) accounting is inaccurate if you apply an access control list
(ACL) to the interface of a line card.
Conditions This symptom is observed on a Gigabit Ethernet (GE) interface of a Cisco 12000 series
3-port GE line card.
Workaround Do not apply an ACL to the interface.
•
CSCdx23785
Symptoms The slow path (that is, the process-switched path) is broken on a Cisco 12000 series
Engine 4 and Engine 4 Plus line card.
Conditions This symptom is observed in an IP to Multiprotocol Label Switching (MPLS)
environment. Note that the fast path (that is, the hardware switching path) is not affected.
Workaround There is no workaround.
•
CSCdx24242
Symptoms Packets with a valid source IP address that is reachable via tag switching are not passed
through.
Conditions This symptom is observed when you have unicast Reverse Path Forwarding (uRPF)
configured on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx24750
Symptoms A Multiprotocol Label Switching (MPLS) traffic engineering (TE) tunnel may assume
an outgoing link that is different from the one that is specified in the explicit path if the outgoing
link of the TE tunnel fails.
Conditions This symptom is observed in an MPLS TE tunnel that is set up explicitly by specifying
the IP address of the next hop interface as the next address. This symptom occurs if the outgoing IP
address is a router ID.
Workaround There is no workaround.
•
CSCdx25287
Symptoms Traffic does not always resume on the backup path and may stop altogether between two
provider edge (PE) routers when you shut down the primary path.
Conditions This symptom is observed when you configure Ethernet over Multiprotocol Label
Switching (EoMPLS) virtual circuits (VCs) between peer PE routers that are connected through one
primary path and one backup path.
Workaround Reconfigure a VC on the peer PE.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2150
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx26010
Symptoms A router does not have Tag Forwarding Information Base (TFIB) entries for locally
learned routes on a given Virtual Private Network (VPN) routing/forwarding (VRF) instance.
When this symptom occurs, no entries are shown after the show tag forwarding EXEC command
is entered. Only tag information is displayed after the show ip cef vrf EXEC command is entered.
Conditions This symptom is observed when the Label Distribution Protocol (LDP) is toggled on and
off on Multiprotocol Label Switching (MPLS) VPN provider edge (PE) routes that are running the
Carrier Supporting Carrier (CSC) feature with the LDP on the PE to customer edge (CE) interface.
Workaround Do not toggle LDP on or off.
•
CSCdx26711
Symptoms A Cisco 7500 series standby Route Processor (RP) reloads.
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(22.1)S when you first configure multiple “new style” permanent virtual connections
(PVCs) and then configure “old style” PVCs over a PPP ATM subinterface.
Workaround Do not configure “old style” PVCs after you have configured “new style” PVCs over a
PPP ATM subinterface.
•
CSCdx27117
Symptoms Pings fail for the loopback address of a customer edge (CE) router.
Conditions This symptom is observed in a Multiprotocol Label Switching (MPLS) Virtual Private
Network (VPN) network with a Gigabit Ethernet (GE) connection between the provider edge (PE)
router and the CE router. Note that the GE interface can be pinged.
Workaround Enter the clear ip route vrf vrf-name * EXEC command on the PE router.
•
CSCdx29393
Symptoms Cisco Express Forwarding (CEF) gets disabled on a Cisco 12000 series Engine 2 16-port
OC-3 line card.
Conditions This symptom is observed when the line card is configured with 16 different input access
control lists (ACLs) and there are about 100K Border Gateway Protocol (BGP) routes present.
Workaround There is no workaround.
•
CSCdx30014
Symptoms Traffic takes up to 40 to 50 seconds to return to full rate after a switchover.
Conditions This symptom is observed on a Cisco 10000 series edge services routers when there are
about 2500 PPP and High-Level Data Link Control (HDLC) sessions configured over two 6-port
channelized T3, two 1-port channelized OC-12, and one 4-port channelized OC-3 line cards.
Workaround There is no workaround.
•
CSCdx30286
Symptoms On a Cisco 12000 series 6-port channelized T3 and a 2-port channelized OC-3 line card,
multilink interfaces end up being in an Up/Up state, but no traffic can go through and the adjacencies
are incomplete.
Conditions This symptom is observed when you initially load the full multilink configuration but
may occur also when the router or the line card boots up. The delays of the Forwarding Information
Base (FIB) configuration messages may affect the protocol negotiation and cause a lockup. The
larger the configuration file, the more likely that the above-mentioned situation occurs.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2151
Resolved Caveats—Cisco IOS Release 12.0(22)S
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the affected multilink interface.
•
CSCdx30380
Symptoms The active Cisco 10000 series Performance Routing Engine (PRE) reloads.
Conditions This symptom is observed when you use TFTP to load a card configuration of an
over-allocated 1-port channelized OC-12 line card.
Workaround Do not over allocate the 1-port Channelized OC-12 line card.
•
CSCdx31158
Symptoms A router does not receive any alarms and remains up when a connected router is shut
down.
Conditions This symptom is observed when the controller on a Cisco 7500 series Router Switch
Processor (RSP) is shut down.
Workaround There is no workaround.
•
CSCdx31190
Symptoms A Cisco 12000 series standby Route Processor (RP) continues to reload.
Conditions This symptom is observed after the standby RP has rebooted following a Stateful
Switchover (SSO).
Workaround There is no workaround.
•
CSCdx33696
Symptoms The Cisco Express Forwarding (CEF) Toaster processor on a Cisco 10720 series Internet
router restarts with the message “Complex Restart.”
Conditions This symptom is observed on a Cisco 10720 series Internet router that is running
Cisco IOS Release 12.0(21)ST when the following conditions are present:
– Explicit-null labels are configured to be received from the Multiprotocol Label Switching
(MPLS) cloud.
– An input service policy is defined.
– There is a glean adjacency for the IP address found in the packet after the null MPLS label is
discarded.
Workaround Do not use an explicit null configuration and an input service policy configuration
simultaneously.
•
CSCdx33749
Symptoms A Cisco 12000 series Internet router reloads when you insert a Clock and Scheduler Card
(CSC).
Conditions This symptom is observed when you insert a CSC in slot 16 while a Simple Network
Management Protocol (SNMP) query on CISCO-PROCESS-MIB is run.
Workaround Configure an SNMP view excluding CISCO-PROCESS-MIB.
•
CSCdx34255
Symptoms NVRAM becomes very busy after the write memory EXEC command is entered to store
a very large configuration. A vty session may appear to be active after the TCP session has ended.
Neither the vty session nor the line can be cleared. Memory allocation (MALLOC) failures may
occur on the slave Route Switch Processor (RSP).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2152
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions These symptoms are observed on a router that has master and slave cards if a very large
configuration is stored using the write memory EXEC command on the master card.
Workaround Reload the slave RSP using the slave console port.
•
CSCdx34724
Symptoms T1 remote loopback functions do not operate on a Cisco 10000 series 24-port
channelized E1/T1 line card. Cisco IOS software shows loopback states to be set, but the line card
does not send out the bit-oriented message to set the loopback state in the remote interface.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx34902
Symptoms Intermediate System-to-Intermediate System (IS-IS) flapping occurs on a Cisco 10720
Internet router during traffic congestion.
Conditions This symptom is observed when IS-IS packets are sent on a spatial reuse protocol (SRP)
ring with an SRP priority 0, which means they are more likely to be dropped by the receiver when
congestion occurs.
Workaround To reduce the chances that packets are being dropped by the receiver, disable IS-IS
padding on the transmitting node by entering the no isis hello padding interface configuration
command.
•
CSCdx34970
Symptoms A Cisco 12000 series Route Processor (RP) reloads after attempting to remove an Any
Transport over MPLS (AToM) tunnel.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(22)S and that is configured as an provider edge (PE) router in a
Multiprotocol Label Switching (MPLS) AToM (in this case, adaptation layer 5 [AAL5] over MPLS)
environment.
Workaround There is no workaround.
•
CSCdx34997
Symptoms On an OC-3 Packet-over-SONET (POS) line card that has PPP encapsulation enabled, an
alarm indication signal (AIS) count may be detected on the far end of the link.
Conditions This symptom is observed when the Rx fiber is removed on the near end.
In fixing this caveat, the OC-12 POS portion of the code was properly corrected, but the OC-3 POS
portion of the code was missing a change to a function. As a result, the AIS count may not show up
(or it may show up), but the AIS may not be transmitted properly when the port is in the “admin
down” or “loopback” state.
Workaround There is no workaround.
•
CSCdx36117
Symptoms A microcode reload of a 3-port Gigabit Ethernet (GE) line card causes the Forwarding
Information Base (FIB) to be disabled and the following error message to be displayed:
%FIB-3-FIBDISABLE: Fatal error, slot 2: No window message, LC to RP IPC is no
n-operational
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2153
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed after a Border Gateway Protocol (BGP) convergence of a
Cisco 12416 Internet router that is running Cisco IOS Release 12.0(21.2)S and that is configured
with 200 BPG peers and the following line cards:
– Two 8-port or 16-port OC-3 Packet-over-SONET line cards (in a shutdown state)
– Four 3-port GE line cards, each configured with an even distribution of 2000 VLAN
subinterfaces
– Three 6-port channelized T3 line cards (in a shutdown state)
– Two Quad OC-12 ATM line cards (in a shutdown state)
Workaround There is no workaround.
•
CSCdx36273
Symptoms Incoming Multiprotocol Label Switching (MPLS) traffic that is destined for Virtual
Private Network (VPN) prefixes cannot be forwarded over a VPN routing/forwarding (VRF)
Generic Routing Encapsulation (GRE) tunnel. The traffic is dropped at the disposition Provider
Edge (PE) router, which is a Cisco 7500 series router.
Conditions This symptom is observed when distributed switching is enabled on an interface.
Workaround Configure the no ip route-cache distributed command on the input interface.
Alternate Workaround Configure the ip cef command globally.
•
CSCdx37097
Symptoms You cannot scale to more than 50,000 Virtual Private Network (VPN) routes on a
Cisco 12000 series Engine 4 Plus line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.2)S.
Workaround There is no workaround.
•
CSCdx37539
Symptoms When an interface goes into a down state (but not in an administratively down state) and
you have a virtual circuit (VC) configured on that interface, the VC goes into an inactive state.
However, when the interface comes up again, the VC on the interface does not go into an active state
but remains in an inactive state.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx37849
Symptoms A device that is running Cisco IOS software may reload when a command is issued to
display a file that contains certain character patterns.
Conditions This symptom occurs if the file in question has a very large line. This line may have a
very large continuous set of characters without any new line characters and is most likely corrupted.
Workaround There is no workaround.
•
CSCdx37885
Symptoms After reloading a neighboring router that is connected to a Cisco 12000 series 12E3-SMB
line card, Loss of Frame errors occur and the interface and line protocol are down.
Conditions This symptom is observed on a Cisco 12000 series 12E3-SMB line card that is running
Cisco IOS Release 12.0(21)ST1, after reloading the neighboring router that is connected to the
12E3-SMB line card.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2154
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Workaround Enter the hw-module slot shelf-id/slot-number reload EXEC console command for the
12E3-SMB line card.
•
CSCdx37965
Symptoms A Cisco 10000 series edge services router (ESR) encounters a parallel express
forwarding (PXF) microcode reload. The error logged at the time of the reload may be one of the
following:
%TOASTER-2-FAULT T1 SW Exception CPU[t1rXc1] 0x00000780
PXF CPU Toaster Stall Error
PXF DMA FTC Bad Address
Conditions This symptom is observed when NetFlow is enabled, there are many active flows, and
there is a high traffic rate on the router.
Workaround Disable NetFlow. After the PXF reload, the Cisco IOS software will reload the PXF
microcode, and packet forwarding will resume.
•
CSCdx38125
Symptoms Traceback messages may be displayed after the ip accounting mac-address input
interface configuration command is configured on VLANs that have an input access control list
(ACL) present. Also, accounting based on the source MAC address stops incrementing after the
tracebacks are observed.
Conditions This symptom is observed on a 3-port Gigabit Ethernet card on a Cisco 12000 series
Internet router that is running Cisco IOS Release 12.0(21)ST1 in the presence of input VLAN traffic
with an input ACL and with input source mac-address accounting configured on the VLAN
interface.
Workaround Remove input ACLs on the VLAN interface.
•
CSCdx38166
Symptoms On a Cisco 10000 series 24-port channelized E1/T1 line card that is configured with 48
channels and with 12 time-slots per channel, traffic is misdirected from channels 13 to 24 to
odd-numbered channels 25 to 47.
Conditions This symptom is observed after you first have configured 24 channels with 24 time-slots
per channel on the 24-port channelized E1/T1 line card.
Workaround There is no workaround.
•
CSCdx38188
Symptoms Certain IP Services Engine (ISE) optical carrier (OC-3) concatenated line cards may fail
to initialize and pause indefinitely at the IOS_STRT process when startup occurs.
Conditions This symptom is observed only on 16-port line cards that are shipped with specific
optical modules when releases prior to Cisco IOS Release 12.0(22)S are used. The 16-port line cards
that are affected by this symptom have optical modules that are silver and grey in color. The 16-port
line cards that are not affected by this symptom have optical modules that are light blue in color.
Workaround Use Cisco IOS Release 12.0(21)ST3, 12.0(22)S, 12.0(21)S4, or a later Cisco IOS
release.
•
CSCdx38578
Symptoms An edge router reloads when route flapping occurs.
Conditions This symptom is observed on an edge router that has the Multi-VC feature configured
and that has an label-controlled ATM (LC-ATM) interface that faces the Multiprotocol Label
Switching (MPLS) core.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2155
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx38690
Symptoms Large packets fail to pass on a Cisco 3600 series router that is configured with a
High-Speed Serial Interface (HSSI) Network Module.
Conditions This symptom is observed on a Cisco 3600 series router that is running Cisco IOS
Release 12.2(10) or Release 12.2(10.3)T and occurs only when large packets are sent.
Workaround Issue the mtu 1019 interface configuration command to set the maximum transmission
unit (MTU) size of the HSSI interface to 1019 bytes. This workaround may not work in all cases.
•
CSCdx39482
Symptoms A Traffic Engineering (TE) tunnel that is configured to run an explicit path that uses an
IP address of a neighboring router interface takes another outgoing interface than the one specified
in the explicit path.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx40927
Symptoms A router that is configured with equal-cost IPv6 static default routes may reload.
Conditions This symptom is observed on a router that is configured with more than four equal-cost
IPv6 static default routes that are recursive (which means that the next hop router is not directly
connected).
Workaround There is no workaround.
•
CSCdx41250
Symptoms A Cisco 12000 series Engine 0 line card interface is in a Down/Down state after a
switchover occurs.
Conditions This symptom is observed when the following sequence of events occurs:
a. Switchover in Route Processor Redundancy Plus (RPR+) mode
b. Mode change Stateful Switchover (SSO)
c. Switchover is SSO mode
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the interface.
•
CSCdx41743
Symptoms All channel groups on a T1 line are disabled.
Conditions This symptom is observed when a bit error rate test (BERT) is run on a T1 line and is
either stopped or allowed to run to completion and when you subsequently perform an online
insertion and removal (OIR) of the line card on which the T1 line is configured.
Workaround Reconfigure the affected channel groups.
•
CSCdx41790
Symptoms The T1 interface and line protocol remain down for virtual tributary (VT) controllers on
a channelized OC-12 line card.
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(22)S.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2156
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx42955
Symptoms After a policy map is reconfigured, a Cisco 10000 series edge services router (ESR) stops
forwarding traffic, but a Parallel Express Forwarding (PXF) reload does not occur.
Conditions This symptom is observed on a Cisco 10000 series ESR that is running Cisco IOS
Release 12.0(21)SX when the following conditions are present:
– There is an output policy map applied to more than one interface.
– Some of the existing classes of the policy-map have Weighted Random Early Detection
(WRED) configured.
– A new class is added to the policy map and is also configured with WRED.
Workaround Remove the policy map from the interfaces before you modify the policy map.
•
CSCdx43665
Symptoms When you send large Internet Control Message Protocol version 6 (ICMPv6) packets
(that is, greater than 1024 bytes) out of a Packet-over-SONET interface, there is a response of
75 percent or less on the receiving side, whereas if you use using ICMP version 4 (ICMPv4), there
is a response of 100 percent.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx45205
Symptoms Open Shortest Path First (OSPF) fails across a multilink bundle.
Conditions This symptom is observed in a distributed Multilink PPP (dMLP) configuration that has
N links in a multilink bundle when a Cisco 7500 router is setup back-to-back with any other peer
router. When any of the links are removed from the bundle on one side (other than Cisco 7500),
OSPF connectivity is lost for few seconds on the Cisco 7500 router side and then recovers
immediately.
Workaround There is no workaround.
•
CSCdx45348
Symptoms The show controller au-4-tug-3 slot subslot port does not display any output.
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(22)S.
Workaround There is no workaround.
•
CSCdx45367
Symptoms A Cisco 10000 series edge services router reloads with an ROM monitor (ROMmon)
error and displays the following message:
%SYS-6-BLKINFO: Corrupted next pointer blk.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx45679
Symptoms A router reloads when packets are process switched from the IP to the Multiprotocol
Label Switching path and need to be fragmented.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2157
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx45702
Symptoms Provider edge (PE) routers that function in a Multiprotocol Label Switching (MPLS)
AToM (in this case, adaptation layer 5 [AAL5] over MPLS) cannot reach each other.
Conditions This symptom is observed on routers that are running Cisco IOS Release 12.0(22)S.
Workaround There is no workaround.
•
CSCdx46634
Symptoms A Cisco 10000 series edge services router does not receive adjacencies for local IP
addresses in Virtual Private Network (VPN) routing/forwarding (VRF) instances, which causes
problems with routing protocols.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command on the interface that has incorrect adjacencies.
•
CSCdx47229
Symptoms A quality of service (QoS) group is overwritten with the port number. The packets that
arrive on an egress line card do not have the QoS group set as expected.
Conditions This symptom is observed when a QoS group is set (for example, using the bgp-policy
destination ip-qos-map command) for a packet that needs to go through Multiprotocol Label
Switching (MPLS) fragmentation.
Workaround There is no workaround.
•
CSCdx47342
Symptoms A Cisco 12008 Internet router reloads because of a bus error and displays the following
error message:
System returned to ROM by bus error at PC 0x5037FD38, address 0x34303A41
Repeat usage of the show mpls forwarding command or the show tag forwarding command causes
the router to reload with the following error message:
Uncompressing (gzip fmt) and reading gsr-p-mz.120-21.ST1.symbols.gz
gsr-p-mz.120-21.ST1.symbols.gz read in Enter hex value: 00.00.00.00 00.00.00.00
00.00.00.00 00.00.00.00 00.00.00.00 00.00.00.00 00.00.00.00
00.00.00.00:ipc_compare_ports(00.00.00.00)+0x0
00.00.00.00:ipc_thread_lookup(00.00.00.00)+0x0
00.00.00.00:ipc_get_port(00.00.00.00)+0x0
00.00.00.00:ipc_process_message(00.00.00.00)+0x0
00.00.00.00:ipc_process_raw_pak(00.00.00.00)+0x0
00.00.00.00:ipc_rx_enqueue(00.00.00.00)+0x0
00.00.00.00:csar_receive_buffer(00.00.00.00)+0x0
00.00.00.00:csar_from_fab_handler(00.00.00.00)+0x0
00.00.00.00:csar_int_handler(00.00.00.00)+0x0
00.00.00.00:bfrp_csar_intr(00.00.00.00)+0x0
Conditions These symptoms are observed on a Cisco 12008 Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(21)ST1 and occur because of a string overflow in a local
stack. This string overflow occurs because the Virtual Private Network version 4 (VPNv4) prefixes
in the autonomous system border router (ASBR) use the complete IP address as the route
distinguisher (for example, “rd: 138.xxx.xxx.xxx:0”) when the show tag forwarding command is
typed, instead of the much shorter autonomous system number.
Workaround Define the route distinguishers using autonomous system numbers instead of IP
addresses.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2158
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx47936
Symptoms If you configure modular quality of service (QoS) using the command-line interface
(CLI) on a 4-port OC-48 Dynamic Packet Transport (DPT) line card, a Cisco 12000 series Internet
router fails.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(21)ST1.
Workaround Configure QoS using the traditional method.
•
CSCdx48420
Symptoms Configuring Virtual Private Network (VPN) routing/forwarding (VRF) instances on a
Frame Relay (FR) subinterface breaks the connectivity between a provider edge (PE) router and a
customer edge (CE) router. The PE router cannot ping the CE router that is directly connected to the
PE router.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround Remove the subinterface completely and reconfigure it.
•
CSCdx48467
Symptoms A Committed Access Rate (CAR) configuration is not effective to police outbound traffic
on a Cisco 12000 series Engine 3 line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.03)S when the outbound traffic is directed to a Traffic Engineering (TE)
tunnel.
Workaround There is no workaround.
•
CSCdx51317
Symptoms A 4-port OC-12 ATM-MM-SC line card reloads because of a bus error exception.
Conditions This symptom is observed when a standard output access control list (ACL) (127 lines)
is configured on another line card—an Engine 2 OC-48E Packet-over-SONET (POS)-SR-SC-B line
card—and commands that are related to the Packet Switching ASIC (PSA) are used.
Workaround There is no workaround.
•
CSCdx52782
Symptoms A 6-port channelized T3 line card reloads when it is configured into T1 channels and then
reconfigured through one TFTP load.
Conditions This symptom is observed on a Cisco 10000 series edge services router. After the line
card reloads, the final configuration prevails and the line card works normally.
Workaround Do not configure and reconfigure T1 channels rapidly (that is, using a TFTP load) at
boot time.
•
CSCdx54358
Symptoms When you enter the show diag command on the Cisco 12000 series Internet router, the
Gigabit Route Processor (GRP) is displayed as an GRP-B, which is misleading
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx55296
Symptoms When you attempt to boot up a Cisco 7500 series router from a Flash card that is inserted
in a Route Switch Processor that is placed in slot 0 or slot 1, the bootup fails because of a
translational bridging (TLB) (load/fetch) exception error.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2159
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a Cisco 7500 series router that is running the rsp-pv-mz
image of Cisco IOS Release 12.0(21.3)S1.
Workaround Set the configuration register to 0x2102 (or another nonzero value) to prevent the
bootup failure. Note that TFTP booting works fine.
•
CSCdx55443
Symptoms An Engine 0 line card may reload.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)S or Release 12.0(21)ST when IP multicast traffic is present. The
following error message may be displayed when this symptom occurs:
%LC-4-UNEXPECTED_INP_INFO: Unexpected info in buffer header, input info 0x0
Workaround Disable IP multicast or use Cisco IOS Release 12.0(21)ST3.
•
CSCdx56997
Symptoms A router is in Route Processor Redundancy (RPR) mode, but the configuration is defined
as Route Processor Redundancy Plus (RPR+) mode or Stateful Switchover (SS) mode.
Conditions This symptom is observed following a Fast Software Upgrade (FSU) procedure.
Workaround Reload the router.
Alternate Workaround Define the configuration as RPR and then redefine the configuration as RPR+
or SSO.
•
CSCdx59056
Symptoms Label Distribution Protocol (LDP) and Border Gateway Protocol (BGP) with
IPv4+labels could be applied to the same Virtual Private Network (VPN) routing/forwarding
instance (VRF) on the same router, which is restricted in the current code. Hence, the feature cannot
work properly.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)3S1.
Workaround There is no workaround.
•
CSCdx59650
Symptoms When a 802.1Q interface is already configured on a Cisco 10000 series edge services
router, reentering the same commands that you used to configure the 802.1Q interface causes the
interface to stop sending traffic.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround Delete and create subinterfaces if you are going to configure 802.1W interfaces.
Entering the shutdown interface configuration command followed by the no shutdown interface
configuration command on the 802.1Q interface may solve the situation.
•
CSCdx60213
Symptoms A router 3 Gigabit Ethernet (GIG E) reloads.
Conditions This symptom is observed on a Cisco 12000 series Internet router when the catalyst
connected to one of the 3 Gigabit Ethernet (GE) ports is reset.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2160
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx62442
Symptoms If you perform two Route Processor Redundancy Plus (RPR+) switchovers and you
reload microcode, the router fails to synchronize interface configurations to the standby Route
Processor (RP) and the following error message is displayed:
%FILESYS-4-RCSF: running config Too big to sync.. (46453) <> -Traceback= 5038169C
5038177C 50247664 502C8DEC 502C9064 502C9648 502C9700 502CA638 502CA9C4 501E9A24
501E9A10 00:11:28: %GRP-4-CFGSYNC: Failed to sync interface config to standby RP
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx62533
Symptoms A Cisco 7500 series router reloads with an error message that is similar to the following:
rx_intr: Received giant packet -- dsize=4488, max=4488, p_count=10, max_p_count=9
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(21.3)S1 and that is configured with a PA-SRP-OC12MM port adapter.
Workaround There is no workaround.
•
CSCdx62750
Symptoms Configuring a router to use a Forwarding Adjacency Traffic Engineering (TE) tunnel may
result in a software reload.
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCdx62768
Symptoms Traffic fails after a Performance Routing Engine (PRE) cutover on the provider edge (PE)
router.
Conditions This symptom is observed on a Cisco 10000 series edge services router.
Workaround There is no workaround.
•
CSCdx62867
Symptoms Sixty six interfaces out of 3000 interfaces do not come up after three switchovers.
Conditions This symptom is observed on a Cisco 10000 series edge services router when 3000
High-Level Data Link Control (HDLC) interfaces are configured and you switch one or more times
from the primary Performance Routing Engine (PRE) to the secondary PRE.
Workaround There is no workaround.
•
CSCdx63206
Symptoms A Cisco 10000 series 24-port channelized E1/T1 line card cannot ping a remote router if
a network line loopback command has been previously applied and then removed.
Conditions These symptoms are observed on a Cisco 10000 series edge services route during
channelization tests.
Workaround Do not apply a network line loopback command to the framer of the line card.
•
CSCdx64606
Symptoms The routes database of a provider edge (PE) router that is running IPv6 in a Multiprotocol
Label Switching (MPLS) environment (also referred to as a 6PE router) is not cleared when Border
Gateway Protocol (BGP) is stopped. When BGP comes up again, the 6PE continues to use old
entries and forwards traffic incorrectly.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2161
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx65575
Symptoms After an Route Processor Redundancy Plus (RPR+) switchover during Border Gateway
Protocol (BGP) convergence, line cards stay in the Cisco IOS “Up” state which causes the line cards
to time-out and the following error message to appear:
SLOT 6:00:21:51: %FIB-3-FIBDISABLE:
for messages from RP
SLOT 4:00:21:30: %FIB-3-FIBDISABLE:
for messages from RP
SLOT 5:00:21:30: %FIB-3-FIBDISABLE:
for messages from RP
SLOT 3:00:21:30: %FIB-3-FIBDISABLE:
for messages from RP
Fatal error, slot 6: Linecard timed out waiting
Fatal error, slot 4: Linecard timed out waiting
Fatal error, slot 5: Linecard timed out waiting
Fatal error, slot 3: Linecard timed out waiting
The switchover occurs after the line cards are in the Cisco IOS “Run” state.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx66626
Symptoms A Cisco router does not forward a Bootstrap Protocol (BootP) that comes across a
High-Level Data Link Control (HDLC) encapsulation connection from a particular non-Cisco
device. The non-Cisco device sends BootP packets as broadcasts, but neglects to set the “broadcast”
bit in the HDLC header, which causes all HDLC packets to be dropped.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS Release 12.0 S.
Workaround There is no workaround.
•
CSCdx66913
Symptoms Per-packet load-balancing does not function.
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(21.3)S1.
Workaround There is no workaround.
•
CSCdx67602
Symptoms An indefinite output pause may occur on a serial interface that is a member of a multilink
group, and the following logs may be seen:
May 16 18:53:05.812: %RSP-3-RESTART: interface Serial3/0/0, not transmitting
May 16 18:53:05.812: Serial3/0/0: microcode reload
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.2(10) with a PA-4T-V35 port adapter inserted in the Versatile Interface Processor
(VIP)2-50 or in the VIP2-40 and where one physical interface is a member of a multilink group and
another interface is configured for High-Level Data Link Control (HDLC), and where Cisco Express
Forwarding (CEF) is enabled globally and disabled on the multilink interface (bundle master), and,
lastly, where distributed weighted fair queuing (WFQ) is enabled on the interface configured for
HDLC.
Workaround There is no workaround.
•
CSCdx67827
Symptoms Spurious reporting of T1 bit error rate test (BERT) data occurs, and LCDOS reloads may
occur on the line card on which the T1 line is configured.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2162
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a Cisco 10000 series router when you perform a BERT on
a T1 line that is not in an “Up” state.
Workaround There is no workaround.
•
CSCdx67850
Symptoms A pattern synchronization “lost/found” interrupt storm causes the depletion of buffer
pools on a Cisco 10000 series line card and may cause the line card to reload.
Conditions This symptom is observed on a local router when a remote router is reset during a bit
error rate test (BERT).
Workaround There is no workaround. The fix for this caveat adds a throttle mechanism to keep any
type of interrupt storm from taking up too much space on the processor of a line card.
•
CSCdx69170
Symptoms Enabling 448 lines of ingress access control lists (ACLs) on a Cisco 12000 series
Engine 2 Quad OC-12 Packet-over-SONET (POS), a 1-port OC-48 POS, or an OC-48 Dynamic
Packet Transport (DPT) line card causes traffic forwarding to fail.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.3)S2.
Workaround There is no workaround.
•
CSCdx70546
Symptoms A secondary Cisco 10000 series Performance Routing Engine (PRE) reloads, and both
the primary and the secondary PRE go to a ROM monitor (ROMmon) state.
Conditions This symptom is observed when you perform a switchover on a Cisco 10000 series edge
services router (ESR) that is configured with 100 ATM permanent virtual connections.
Workaround There is no workaround.
•
CSCdx71843
Symptoms Loopback fails on engine 2 line cards.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.3)S2.
Workaround There is no workaround.
•
CSCdx73286
Symptoms Two channelized interfaces have the same interface index (ifIndex) number.
Conditions This symptom is observed on a Cisco 12000 series Internet router when you create, clear,
and then recreate channelized interface description blocks (IDBs) according to the following steps:
a. Create serial interface 2/0/1:0
b. Create serial interface 2/1/1:0
c. Clear serial interface 2/0/1:0
d. Clear serial interface 2/1/1:0
e. Create serial interface 2/0/1:0
f. Create serial interface 2/0/1:1
g. Create serial interface 2/1/1:0
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2163
Resolved Caveats—Cisco IOS Release 12.0(22)S
The condition arises in Steps f and g. When you enter the show idb command, serial interface
2/0/1:1 and serial interface 2/1/1:0 display the same ifIndex number although they have two different
IDBs.
Workaround There is no workaround.
•
CSCdx73364
Symptoms A Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) between a
provider (P) router and a provider edge (PE) router does not function. MPLS VPN deaggregation
packets are dropped by the PE router.
Conditions This symptom is observed when you use a Cisco 12000 series 3-port Gigabit Ethernet
line card between the P and PE router.
Workaround There is no workaround.
•
CSCdx73666
Symptoms Some channelized users may be left down and, via Cisco Discovery Protocol (CDP), you
can see these devices connected via different E1s and time slots.
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(21)ST when the redundancy force-failover main-cpu command is used.
Workaround A temporary workaround is to reconfigure the correct controller details. Otherwise,
there is no workaround.
•
CSCdx73916
Symptoms The Multiprotocol Label Switching (MPLS) forwarding table does not display a label for
an aggregate route.
Conditions This symptom is observed on a Cisco 10720 Internet router and affects only the
aggregate routes that are explicitly configured under the Border Gateway Protocol (BGP)
configuration using the aggregate-address address mask summary-only command.
Workaround There is no workaround.
•
CSCdx74709
Symptoms The Ring Access Controller (RAC) watchdog timer of a Cisco 12000 series Dynamic
Packet Transport (DPT) line card expires and forces the RAC into a pass through state.
Conditions This symptom is observed when there is an error condition and the CPU usage is
100 percent.
Workaround There is no workaround.
•
CSCdx74841
Symptoms Irregularities occur when you create permanent virtual connections (PVCs) on a
Cisco 10000 series edge services router (ESR).
Conditions This symptom is observed on a Cisco 10000 series ESR when an ATM interface is not
up and an existing variable bit rate (VBR) or constant bit rate (CBR) PVC is modified, causing the
total subscribed rate that is associated with the ATM interface to be improperly adjusted.
Workaround Modify an existing VBR or CBR PVC when the ATM interface is up.
•
CSCdx74864
Symptoms A bus error may occur on a router and the router returns to the ROM monitor (ROMmon)
prompt.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2164
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a Cisco 10000 series edge services router when running an
ATM test, atm_mult_card_mult_port_vbr_aggr_segm_and_reas_change_pcr. This error seems to
happen on the unconfiguration part of the test.
Workaround There is no workaround.
•
CSCdx75775
Symptoms The multicast prefix 224.0.0.0/4 is missing from the Cisco Express Forwarding (CEF)
table for all nondefault Virtual Private Network (VPN) routing/forwarding (VRF) instances on all
line cards and redundant Route Processors.
Conditions This symptom is observed on a a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx76085
Symptoms A few out of 1000 interfaces are not up after a Trivial File Transfer Protocol (TFTP)
loading configuration has occurred.
Conditions This symptom is observed on a Cisco 10000 series edge services router
Workaround There is no workaround.
•
CSCdx76487
Symptoms An IronBus error occurs on a Cisco 10000 series edge services router.
Conditions This symptom is observed when flapping occurs on serial interfaces that are configured
on a T1 line that is configured on a T3 line on a Cisco 10000 series 1-port channelized OC-12 line
card.
Workaround There is no workaround.
•
CSCdx76645
Symptoms A backup clock switched card0 (CSC0) may to go into a “going on” state.
Conditions This symptom is observed when an online insertion and removal (OIR) is performed on
a primary CSC on a Cisco 12406 router with the primary clock on CSC1 (slot 17).
Workaround There is no workaround.
•
CSCdx77061
Symptoms Certain small packets that require padding encounter packet corruption because the last
byte of the packet payload is corrupted.
Conditions This symptom is observed on a Cisco 10720 Internet router that is running Cisco IOS
Release 12.0(19)SP or a later release and occurs only on packets that have 35 or 39 bytes of IP length
and does not affect packets of any other size.
Workaround There is no workaround.
•
CSCdx79262
Symptoms Line cards may reload while trying to send traffic in a basic Virtual Private
Network (VPN) setup.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2165
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx79282
Symptoms NetFlow statistics may not be recorded for some packet flows.
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(20)ST3. If there are many active flows and they stop all at once, the
NetFlow statistics for many of the flows may not be recorded.
Workaround There is no workaround.
•
CSCdx79327
Symptoms Under rare situations Parallel Express Forwarding (PXF) may reload with the following
message:
"%PXF-2-FAULT: T0 Local Bus Exception: CPU[t0r1c1] TBACB"
Conditions This symptom is observed on a Cisco 10000 series edge services router. The symptom
persists while forwarding to a particular IP address. The address cannot readily be predetermined.
In Cisco IOS Release 12.0(20)ST, Release 12.0(21)ST, and Release 12.0(21)SX on Performance
Routing Engine (PRE)-1, no reload occurs, but traffic for the affected IP address is not forwarded.
Workaround There is no workaround.
•
CSCdx80124
Symptoms Gigabit Route Processor (GRP) and GRP-B temperatures are incorrectly reported as NA.
Conditions This symptom is observed when running the show environment [ temperatures ]
privileged EXEC command on a Cisco 120000 series Internet router.
Workaround There is no workaround.
•
CSCdx80546
Symptoms A standby Route Processor (RP) may reload when a primary configuration is changed.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx80891
Symptoms If policing is enabled using the Modular QoS CLI (MQC), it may not work with
Class-Based Weighted Fair Queueing (CBWFQ) on a Frame Relay subinterface, although with Low
Latency Queueing ( ) it may work properly.
Conditions This symptom is observed on a Cisco 7500 series router when packets are Cisco Express
Forwarding (CEF) switched instead of distributed Cisco Express Forwarding (dCEF) switched.
Also, if output policing is enabled on the router, output policing and output queueing may not work.
Workaround Disable output policing or make sure that packets are dCEF switched instead of
non-dCEF switched.
•
CSCdx80911
Symptoms An Ethernet over Multiprotocol Label Switching (EoMPLS) Ether Frame with a
destination MAC address that starts from 0x4 may high drop on the egress provider edge (PE) router.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2166
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx81556
Symptoms Virtual Private Network (VPN) routing/forwarding (VRF) VLAN packet switch ASIC
(PSA) registry memory does not reinitialized when another PSA uload loads and then unloads
because of higher priority PSA features getting configured and then unconfigured. Therefore, VRF
VLAN forwarding no longer works.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx82050
Symptoms The Virtual Private Network (VPN) routing/forwarding (VRF) Selection driver may not
initialize the VRF selection registers when the VRF selection bundle gets loaded.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround Reload the microcode in the line card.
•
CSCdx82372
Symptoms The layer-2 adjacency of a Cisco router may remain glean.
Conditions This symptom is observed on a Cisco 10720 series edge services router that is running
Cisco IOS Release 12.0(21.3)S1 with Virtual Private Network (VPN) routing/forwarding (VRF)
static routes on dot1q sub-interfaces on a Fast Ethernet. The layer-2 rewrite can be built through a
ping. The symptom did not occur on Cisco IOS Release 12.0(21.4)S.
Workaround There is no workaround.
•
CSCdx82381
Symptoms Traceback may occur under certain instances when Border Gateway Protocol (BGP)
invokes the Tag Forwarding Information Base (TFIB) module of a provider edge (PE) router that is
running IPv6 in a Multiprotocol Label Switching (MPLS) environment (also referred to as a 6PE
router) to add a router when nexthop is not set.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is not workaround.
•
CSCdx83597
Symptoms Label Distribution Protocol (LDP) may not come up. The show mpls ldp discovery
command displays the following output message:
TDP running; needs TDP identifier ..
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(21.4)S only if the router is capable of using Stateful Switchover (SSO) after a
switchover.
Workaround Reload the active Route Processor.
•
CSCdx83707
Symptoms Parallel Express Forwarding (PXF) may reload and restart.
Conditions This symptom is observed on a Cisco 10000 series edge services router when deleting
an attached policy map.
Workaround Remove the policy from all interfaces before deleting the policy from the
configuration.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2167
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx84445
Symptoms A line card may be stuck in the off-for-download state.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S2. This symptom may be indicated in the output of the show cef linecard EXEC
command.
Workaround There is no workaround.
•
CSCdx84984
Symptoms On a dual Route Processor (RP) router with the Route Processor Redundancy Plus
(RPR+) feature enabled, if the standby RP is reloaded before it is fully initialized, the global
configuration on the active RP gets locked.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S. The symptom only occurs if the standby RP is reloaded by an
operator command while a Bulk Sync is performed on the running configuration.
Workaround There is no workaround.
•
CSCdx86498
Symptoms A ping fails over a Multiprotocol Label Switching Traffic Engineering (MPLS-TE)
tunnel.
Conditions This symptom is observed on a Cisco 12000 series Internet router when the uplink
interface is a Gigabit Ethernet line card.
Workaround There is no workaround.
•
CSCdx86570
Symptoms Spurious accesses occur on a per-packet basis on a Versatile Interface Processor (VIP).
In addition, interfaces and routing protocols on the affected VIP and other interfaces on the router
may flap.
Conditions This symptom is observed on a Cisco 7500 series router when Multiprotocol Label
Switching (MPLS) is enabled on one of the VIP interfaces.
Workaround There is no workaround.
•
CSCdx86907
The following caveat describes two symptoms, two conditions, and two workarounds:
Symptom A An access control list (ACL) does not operate correctly to match Layer 4 Operation
(L4Op) entries. The ACL clears the logical operator unit (LOU) while it is still being used by other
interfaces.
Conditions A This symptom is observed when an ACL is removed from one interface after the ACL
is applied to multiple interfaces.
Workaround A Remove the ACL from all interfaces to which the ACL has been applied and reapply
the ACL to the interfaces as needed.
Symptom B A ternary content addressable memory (TCAM) LOU capacity error may occur even
though the number of used LOUs in the existing ACLs is less than the set limit.
Conditions B This symptom is observed when two different ACLs are applied to two different
interfaces (ACL A on interface A and ACL B on interface B). When ACL A is applied to interface
B, the LOU from ACL B is not cleared. This behavior causes LOUs to be wasted in TCAM.
Workaround B First remove ACL B from the interface, and then reapply ACL A to that interface.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2168
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCdx87271
Symptoms A standby Route Processor may reload after a Route Processor Redundancy Plus (RPR+)
switchover.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S.
Workaround There is no workaround.
•
CSCdx87293
Symptoms When Field Diagnostics are executed on a line card, Framer Loopback tests may fail if
fiber is connected to the line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S.
Workaround Do not run Field Diagnostics on line cards that have fiber connected to them.
•
CSCdx88897
Symptoms Label Distribution Protocol (LDP) cannot create a Tag Information Base (TIB) entry for
0.0.0.0. This prevents LDP from performing label switching on a packet that is routed using the
default route.
Conditions This symptom is observed in Cisco IOS Release 12.2(11.03)T, Release 12.2(11.03)S,
Release 12.2(011.003), Release 12.0(21.04)SY, and Release 12.0(21.04)S.
Workaround There is no workaround.
•
CSCdx89425
Symptoms When a line card reloads while multicast traffic is being sent to its ingress interface, the
line card may reload again.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx90522
Symptoms Multicast packets are not reaching the IP/Open Shortest Path First (OSPF) layer in a
router.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx91397
Symptoms The Multilink PPP (MLPPP) sequence number may not be updating correctly. Also,
traffic gets punted to the Route Processor (RP).
Conditions This symptom is observed on a Cisco 10000 series edge services router that is running
Cisco IOS Release 12.0(21.4)S after a Performance Routing Engine (PRE) cutover.
Workaround Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command after the cutover.
•
CSCdx91482
Symptoms A master Route Switch Processor 8 (RSP8) may reload after an online insertion and
removal (OIR) of a line card
Conditions This symptom is observed on a Cisco 7500 series router that is configured with dual
RSP8s.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2169
Resolved Caveats—Cisco IOS Release 12.0(22)S
Avoiding an OIR following the bootup of the slave RSP8 reduces the chance that the master RSP8
will reload. The symptoms have not been observed on other RSPs (that is, other than the RSP8s).
Workaround There is no workaround.
•
CSCdx93629
Symptoms The following error messages may be displayed on a router:
SLOT 8:00:27:52: %EE48-5-TM_PROC: TCAM
Appl:2 fail: 40
-Traceback= 403503E0 403504FC 40356E34
SLOT 8:00:28:00: %EE48-5-TM_PROC: TCAM
Lbl:4099 Appl:2 fail: 35
-Traceback= 403503E0 403504FC 40356E34
Delete Table not free(40), Alpha:RX Lbl:4099
4035779C 403579B0 400B3DFC 400B3DE8
Delete Invalid Parameters(35), Alpha:RX
4035779C 403579B0 400B3DFC 400B3DE8
The access control list (ACL) stops functioning properly after this symptom occurs.
Conditions This symptom is observed if the same ACL is applied to multiple interfaces on an IP
Service Engine (ISE) that is installed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdx94390
Symptoms The following error message appears on a Cisco 12000 series Internet router when you
enable a turbo access control list (Turbo ACL):
%SYS-2-MALLOCFAIL: Memory allocation of 10980020 bytes failed from 0x400BE22C,
alignment 32
Pool: Processor Free: 25912464 Cause: Memory fragmentation
Alternate Pool: None Free: 0
Cause: No Alternate pool
-Process= "TurboACL", ipl= 0, pid= 41
-Traceback= 400BB150 400BD4E4 400BE234 40BCDBE4 40BCDA70 40BCDAB8 40BCDAB8 40BCD97C
40BCFD00 40BD1650 400B3DFC 400B3DE8
Conditions This symptom is observed on a a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S2 and that is configured with an 8-port Fast Ethernet 100-Base-TX
interface with 128 MB of route memory.
Workaround Turn off compiled access lists using the no access-list compiled global configuration
command.
•
CSCdx96315
Symptoms A line card reloads when you remove a static route from a Cisco 12000 series Internet
router.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
•
CSCdx96410
Symptoms Traffic that is travelling into the core from a autonomous system border router (ASBR)
is dropped from an inter-autonomous system setup because some packets that are travelling out of
the ASBR are corrupted in the hardware of a Cisco 12000 series Engine 2 line card.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdy01678
Symptoms Traffic is forwarded to the correct outgoing interface, but no labels are imposed on the
traffic.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2170
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed in the case of an Inter-AS Multiprotocol Label Switching
(MPLS) Virtual Private Network (VPN) when E4P receives traffic on a VPN routing/forwarding
(VRF) interface on an autonomous system border router (ASBR).
Workaround There is no workaround.
•
CSCdy04039
Symptoms A 3xGE card may reload following the configuration of Border Gateway Protocol (BGP)
Policy Accounting on either the main interface or a subinterface.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S2.
Workaround There is no workaround.
•
CSCdy10296
This caveats is closed in Cisco IOS Release 12.0(22)S.
Symptoms Distributed Cisco Express Forwarding (dCEF) is disabled on a Cisco 12000 series
Engine 4 (E4) line card, and the line card runs out of forwarding memory.
Conditions This symptom is observed on an E4 line card that is configured with approximately
200,000 Border Gateway Protocol (BGP) routes and with more than 4000 Intermediate
System-to-Intermediate System (IS-IS)/Open Shortest Path First (OSPF) routes, when each
IS-IS/OSPF prefix is a multipath route.
Workaround Disable outgoing class of service (CoS) by entering the no cos gsr tx command. The
cos gsr tx command is an undocumented command that, by default, allocates an amount of memory
for CoS functionality when the router boots up, even if you have not configured CoS. However, if
you have enabled CoS on the E4 line card, entering the no cos gsr tx command will disable CoS on
the E4 line card.
•
CSCin01394
Symptoms A Cisco 7500 series router displays the following error messages:
%SRP-4-ALARM: SRP0/0/0 Side B Keepalive Failure (MAC)
%SRP-4-WRAP_STATE_CHANGE: SRP0/0/0 wrapped on side A (side B Self Detect Signal Fail)
%SRP-4-ALARM: SRP0/0/0 Side B Keepalive OK
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(21)S and through which no traffic is flowing.
Workaround There is no workaround.
•
CSCin03257
Symptoms A back-to-back ping for multilink fails.
Conditions This symptom is observed when you have the multilink min-links links command
configured on the multilink interface.
Workaround Enter the shutdown interface configuration command on the multilink interface, wait
for the multilink and the member links to go down, and enter the no shutdown interface
configuration command on the multilink interface. After the multilink comes up, the back-to-back
ping for multilink will work.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2171
Resolved Caveats—Cisco IOS Release 12.0(22)S
•
CSCin03391
Symptoms Pings cannot be sent between routers.
Conditions This symptom is observed when a ping is sent from a customer edge (CE) router to
another CE router via a provider edge (PE) router. This symptom occurs if the routers are configured
using scripts.
Workaround There is no workaround.
•
CSCin07076
Symptoms A Cisco 7500 router may reload.
Conditions This symptom is observed on a Cisco 7500 series router after distributed Multilink PPP
(dMLP) is enabled.
Workaround There is no workaround.
•
CSCin08685
Symptoms A Cisco 7200 series router reloads because of memory allocation (MALLOC) failures.
Conditions This symptom is observed on a Cisco 7200 series router that is configured with a
PA-MC-8TE1+ port adapter when the router is connected back-to-back to another router with full
channelization and heavy traffic flowing through the interfaces. When the router that is connected
to the Cisco 7200 series router reloads, the interfaces flap and cause the Cisco 7200 series router to
reload.
Workaround There is no workaround.
•
CSCin10568
Symptoms Untagged entries appear in the Tag Forwarding Information Base (TFIB).
Conditions This symptom is observed when you toggle a Label Distribution Protocol (LDP)/Tag
Distribution Protocol (TDP) session by toggling the LDP router identification (ID). This situation
occurs in Cisco IOS Release 12.0 (21.01)SY02, Release 12.0(21.01)S02, Release 12.2(08.05)T,
Release 12.2(08.04) S, Release 12.002(008.004), or later versions of the above-mentioned releases.
Workaround Enter the clear ip route network command to recover from the situation.
•
CSCuk32791
Symptoms A Cisco 12000 series Engine 0 line card that is configured with a high number of
adjacencies is disabled when restarted. The following Forwarding Information Base (FIB) disable
error message is displayed for the line card:
%FIB-3-FIBDISABLE: Fatal error, slot 3: No window message, LC to RP IPC is
non-operational
CEF-IPC: Disabled distributed CEF in 3 slot. linecard disabled because we did not get
a window message
CEF-IPC: Sent DCEF terminate request to slot 3
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(19)S02, Release 12.0(20.03)ST01, Release 12.0(20.03)S01, or later
releases and occurs only at the startup of an Engine 0 line card that is configured with approximately
15,000 or more adjacencies.
Workaround Reduce the number of adjacencies to less than 15,000.
•
CSCuk34310
Symptoms A Cisco 12000 series Internet router reloads unexpectedly after multiple Border Gateway
Protocol (BGP) route state transitions (flaps) occur.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2172
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(22)S
Conditions This symptom is observed on a Cisco 12000 series Internet router that has Multiprotocol
Label Switching (MPLS) enabled.
Workaround There is no workaround.
Wide-Area Networking
•
CSCdm12179
Symptoms A multilink interface stops processing received packets from a peer.
Conditions This symptom is observed when the peer multilink interface goes down and comes back
up. The show ppp multilink command will indicate “received lost fragments” when the symptom
occurs.
Workaround Clear the multilink interface.
•
CSCds31716
Symptoms A Cisco 7500 series router that is configured with a Route Switch Processor 1 (RSP1)
pauses indefinitely at the rsp_fs_free_memd_pak process and displays the following message on the
console:
%RSP-3-BADBUFHDR: freeing MEMD pak, address 0 -Traceback= 60367710 60373AA4 602D30B8
600DA700 602413E0 602416D8 60FCE4D8 60FCC CD0 602223C8 602224F4 6036A260 60378E70
60331290
Conditions The conditions under which these symptoms occur are not known at this time.
Workaround There is no workaround.
•
CSCds80984
Symptoms Packets are lost when a single link is contained in a Multilink PPP (MLP) or dialer
interface. Interleaving does not work, and most or all voice packets are lost.
Conditions These symptoms are observed in Cisco IOS Release 12.1 and Release 12.1 T when an
MLP/Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) routing/forwarding
(VRF) instance and Cisco Express Forwarding (CEF) or a dialer interface are used with MLP.
Workaround Use a fragmentation delay of 10 ms or 20 ms on dialer interfaces that use MLP
encapsulation with MPLS or with CEF, or add a dialer load threshold of 1 to the dialer interface.
•
CSCdu60305
Symptoms A Versatile Interface Processor (VIP) reloads because of memory corruption.
Conditions This symptom is observed when Inter-Switch Link (ISL) encapsulation is enabled on an
interconnected Gigabit Ethernet interface and traffic is flowing between two routers that are
connected or an information exchange of keepalives or of Cisco Discovery Protocol (CDP) occurs.
Workaround There is no workaround.
•
CSCdx02803
Symptoms All router interfaces on a Cisco 7500 series router come down, and the router produces
error messages that start in the following way:
%RSP-2-QAERROR: reused or zero link error, write at addr 1AA0 (QA) log 221AA000, data
FCF00000 00000000
%QA-3-DIAG: Failed to enqueue buffer header 0xFCF0
%QA-3-DIAG: Approximate stack backtrace prior to interrupt:
%QA-3-DIAG: -Traceback= 60A6AC68 601E0B14 603639D8 60311680
%QA-3-DIAG: No NULL terminator for queue 0x28
Note: There may be many other error messages.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2173
Resolved Caveats—Cisco IOS Release 12.0(21)S8
Conditions This symptom is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0(20.4)ST.
Workaround There is no workaround.
•
CSCdx51820
Symptoms A Cisco 12000 series Internet router that has the frame-relay nni-annex1 command
enabled on an Engine 0 or Engine 2 line card and routed permanent virtual circuits (PVCs)
configured reloads.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.3)S when you attempt to configure High-Level Data Link Control
(HDLC) encapsulation on any Engine 0 or Engine 2 line card.
Workaround Disable the frame-relay nni-annex1 command before you configure the
encapsulation.
Resolved Caveats—Cisco IOS Release 12.0(21)S8
Cisco IOS Release 12.0(21)S8 is a rebuild release for Cisco IOS Release 12.0(21)S. The caveats in this
section are resolved in Cisco IOS Release 12.0(21)S8 but may be open in previous Cisco IOS releases.
Miscellaneous
•
CSCeb09402
Symptoms: When upgrading to a special build image based on Cisco IOS Release 12.0(21)S6, a
Cisco router with peer-group configuration is sending full Border Gateway Protocol (BGP) routes
to its neighbors, but there are many prefixes that are missing from the neighbor side. Turning on the
debug ip bgp update privileged EXEC command on the neighbor side shows the following error
when the routes are received:
BGP: x.x.x.x rcv UPDATE about y.y.y.y/nn -- DENIED due to: non-connected next- hop;
Conditions: The problem is that an incorrect NEXTHOP is sent to some peer- group members.
Cisco IOS Release 12.0(21)S2 image does not exhibit this problem.
Workaround: Configure the neighbor ip- address | peer-group-name next-hop- self command for
the peer-group. See the following example:
neighbor ext-peers peer-group
neighbor ext-peers next-hop-self
•
CSCed27956
A vulnerability in the Transmission Control Protocol (TCP) specification (RFC793) has been
discovered by an external researcher. The successful exploitation enables an adversary to reset any
established TCP connection in a much shorter time than was previously discussed publicly.
Depending on the application, the connection may get automatically re-established. In other cases,
a user will have to repeat the action (for example, open a new Telnet or SSH session). Depending
upon the attacked protocol, a successful attack may have additional consequences beyond
terminated connection which must be considered. This attack vector is only applicable to the
sessions which are terminating on a device (such as a router, switch, or computer) and not to the
sessions that are only passing through the device (for example, transit traffic that is being routed by
a router). In addition, this attack vector does not directly compromise data integrity or
confidentiality.
All Cisco products which contain TCP stack are susceptible to this vulnerability.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2174
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S7
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-ios.shtml, and it describes this
vulnerability as it applies to Cisco products that run Cisco IOS® software.
A companion advisory that describes this vulnerability for products that do not run Cisco IOS
software is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-nonios.shtml.
•
CSCed38527
A vulnerability in the Transmission Control Protocol (TCP) specification (RFC793) has been
discovered by an external researcher. The successful exploitation enables an adversary to reset any
established TCP connection in a much shorter time than was previously discussed publicly.
Depending on the application, the connection may get automatically re-established. In other cases,
a user will have to repeat the action (for example, open a new Telnet or SSH session). Depending
upon the attacked protocol, a successful attack may have additional consequences beyond
terminated connection which must be considered. This attack vector is only applicable to the
sessions which are terminating on a device (such as a router, switch, or computer) and not to the
sessions that are only passing through the device (for example, transit traffic that is being routed by
a router). In addition, this attack vector does not directly compromise data integrity or
confidentiality.
All Cisco products which contain TCP stack are susceptible to this vulnerability.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-ios.shtml, and it describes this
vulnerability as it applies to Cisco products that run Cisco IOS® software.
A companion advisory that describes this vulnerability for products that do not run Cisco IOS
software is available at
http://www.cisco.com/warp/public/707/cisco-sa-20040420-tcp-nonios.shtml.
Resolved Caveats—Cisco IOS Release 12.0(21)S7
Cisco IOS Release 12.0(21)S7 is a rebuild release for Cisco IOS Release 12.0(21)S. The caveats in this
section are resolved in Cisco IOS Release 12.0(21)S7 but may be open in previous Cisco IOS releases.
Basic System Services
•
CSCdx71842
Symptoms: A router may reload when the ip community-list global configuration command is
entered on the router with an illegal regular expression pattern. The following is an example of a ip
community-list global configuration command that may cause the router to reload:
ip community-list expanded test permit (6327:[1_)
Conditions: This symptom is observed when running Cisco IOS Release 12.0(21)S6.
Workaround: Avoid entering the ip community-list global configuration command with an illegal
regular expression pattern.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2175
Resolved Caveats—Cisco IOS Release 12.0(21)S7
IP Routing Protocols
•
CSCdu53656
A Cisco device running IOS and enabled for the Border Gateway Protocol (BGP) is vulnerable to a
Denial of Service (DOS) attack from a malformed BGP packet. The BGP protocol is not enabled by
default, and must be configured in order to accept traffic from an explicitly defined peer. Unless the
malicious traffic appears to be sourced from a configured, trusted peer, it would be difficult to inject
a malformed packet. BGP MD5 is a valid workaround for this problem.
Cisco has made free software available to address this problem. For more details, see the advisory
at http://www.cisco.com/warp/public/707/cisco-sa-20040616-bgp.shtml.
•
CSCdy48954
Symptoms: Border Gateway Protocol (BGP) prefixes may become missing from the routing table
even when the prefix is present in BGP. The routing entry that is missing is the next-hop entry that
is resolved through the internal Border Gateway Protocol (iBGP).
Conditions: This symptom is observed on a router that is running BGP.
Workaround: Force a best-path recalculation on the prefix to install it to the Routing Information
Base (RIB).
•
CSCea28131
A Cisco device running IOS and enabled for the Border Gateway Protocol (BGP) is vulnerable to a
Denial of Service (DOS) attack from a malformed BGP packet. The BGP protocol is not enabled by
default, and must be configured in order to accept traffic from an explicitly defined peer. Unless the
malicious traffic appears to be sourced from a configured, trusted peer, it would be difficult to inject
a malformed packet. BGP MD5 is a valid workaround for this problem.
Cisco has made free software available to address this problem. For more details, see the advisory
at http://www.cisco.com/warp/public/707/cisco-sa-20040616-bgp.shtml.
Miscellaneous
•
CSCdx59003
Symptoms: A Cisco 12000 series router may report incorrect environmental values, as the following
environmental logs display:
%ENV_MON-2-VOLTAGE: MBUS 5V supply (slot 1) volts has reached SHUTDOWN level at 5 m(V)
%ENV_MON-2-TEMP: Hotpoint temp sensor (slot 17) temperature has reached SHUTDOWN level
at 756(C)
%ENV_MON-2-VOLTAGE: Card 3.3v supply (slot 17) volts has reached CRITICAL level at
2560 m(V)
Although the environmental logs indicate that the shutdown level has been reached, the router does
not shut down the line cards for which the incorrect environmental values are reported.
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S3, Release 12.0(21)S5, Release 12.0(21)ST2, or Release 12.0(22)S.
Workaround: There is no workaround.
•
CSCea02355
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2176
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S7
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
•
CSCea14108
Symptoms: Pings from a customer edge (CE) router may fail in an Any Transport over Multiprotocol
Label Switching (AToM) network.
Conditions: This symptom is observed when Ethernet over Multiprotocol Label Switching
(EoMPLS) AToM and auto negotiation are configured on a Gigabit Ethernet interface.
Workaround: Unconfigure auto negotiation from the Gigabit Ethernet interface.
•
CSCea28914
Symptoms: A Fabric Interface ASIC (FIA) controller halt condition may be observed on the Engine
4 (E4) or Engine 4 plus (E4+) line card of a Cisco 12410.
Conditions: This symptom is observed when the hw-module slot 17 shut EXEC command is
entered while a primary Clock Scheduler Card (CSC) is installed in slot 17 of the E4 or E4+ line
card of a Cisco 12410. This symptom is observed when the Cisco 12410 is running Cisco IOS
Release 12.0(21)S6.
Workaround: Avoid entering the hw-module slot 17 shut EXEC command.
•
CSCea37882
Symptoms: It may take about 10 minutes before a Versatile Interface Processor (VIP) synchronizes
with a Cisco Express Forwarding (CEF) table.
Conditions: This symptom is observed after you reload the VIP that has the Single Line Card Reload
(SLCR) feature and distributed CEF (dCEF) enabled, when there are about 40,000 prefixes in the
CEF table, and when Border Gateway Protocol (BGP) is in stable condition.
Workaround: Increase the interprocess communications (IPC) cache significantly; when there are
about 40,000 prefixes, increase the IPC cache using the ipc cache 3000 command.
•
CSCea38449
Symptoms: Traffic may not be forwarded to an egress line card if an uncorrected parity error is
detected.
Conditions: This symptom is observed on an Engine 3 (E3) IP Services Engine (ISE) line card of a
Cisco 12000 series.
Workaround: Reload the microcode of the line card after the error recovery process occurs.
•
CSCea52787
Symptoms: A memory leak may occur on a line card with the Multicast Distributed Fast Switching
(MDFS) line card process, and the line card may reload.
Conditions: This symptom is observed on a Cisco 12000 series line card when IP multicast routing
is enabled and when there are tunnel interfaces configured. The line card reloads when the MDFS
process on the line card attempts to repeatedly allocate memory after the line card runs out of
memory because of the memory leak. This symptom occurs only if multicast routing is enabled by
entering the ip multicast-routing distributed global configuration command and if a traffic
engineering (TE) tunnel is configured.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2177
Resolved Caveats—Cisco IOS Release 12.0(21)S6
Workaround: There is no workaround.
•
CSCea54482
Symptoms: A fabric switchover error or cyclic redundancy check (CRC) Fabric Interface ASIC
(FIA) controller error may be observed on a Cisco 12000 series when traffic is sent on the router
after it is reloaded. Syslog messages such as the following may be displayed:
FABRIC-3-ERR_HANDLE Due to CRC error from slot 8,shutdown the fabric card on slot 22
Conditions: This symptom is observed when one or more Engine 4 plus (E4+) line cards are installed
on a Cisco 12400 series and the Cisco 12400 series is reloaded with a Cisco IOS release that triggers
a maintenance bus (MBus) download.
Workaround: Perform a second reload of the Cisco 12400 series.
•
CSCea62745
Symptoms: The following error message may be generated often for slot 24 or 25 on a Cisco 12000
series:
%MBUS_SYS-3-NOBUFFER: Message from slot 25 in stream 0 dropped
Conditions: This symptom is observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(21)S5 or Release 12.0(21)S6.
Workaround: There is no workaround.
•
CSCea74092
Symptoms: A provider edge (PE) router may incorrectly encapsulate packets that are received from
a customer edge (CE) router when multicast distributed switching (MDS) is enabled on the PE
router. This behavior causes the packets to be punted.
Conditions: This symptom is observed on a PE router that has a generic routing encapsulation (GRE)
tunnel interface and that has MDS is enabled.
Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(21)S6
Cisco IOS Release 12.0(21)S6 is a rebuild of Cisco IOS Release 12.0(21)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(21)S6 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
•
CSCdw54107
Symptoms: A router keeps advertising type 5 link-state advertisement (LSA) for 0.0.0.0 after
external Border Gateway Protocol (eBGP) default route is removed form the routing table and Open
Shortest Path First (OSPF) default route is installed in the routing table.
Conditions: This symptom is observed under the following conditions:
– router running OSPF
– the default-information originate command is used
– default-route (0.0.0.0/0) is learned from the following:
– eBGP (Admin Distance of 20)
– internal Border Gateway Protocol (iBGP) (Admin Distance of 200)
– OSPD (Admin Distance of 110)
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2178
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S6
Workaround: Filter iBGP default route on the router and use the bgp redistribute-internal
command under router BGP.
•
CSCdw80263
Symptoms: An Engine 4 Plus (E4+) line card may reload with a logical unit overrun error message.
Conditions: These symptoms are observed on the E4+ line card of a Cisco 12000 series Internet
router that is running the gsr-p-mz image of Cisco IOS Release 12.0 ST. This symptom is observed
while there is heavy traffic and a large number of Virtual Private Network (VPN) prefixes on the
router.
Workaround: There is no workaround.
•
CSCdx00274
Symptoms: The single-port Fast Ethernet 100BASETX port adapter (PA-FE-TX) of a
Cisco 7206VXR router that has a Network Processing Engine (NPE-300) may stop receiving burst
traffic packets.
Conditions: This symptom is observed on a PA-FE-TX.
Workaround: Clear by entering the shutdown interface configuration command followed by the no
shutdown interface configuration command on the PA-FE-TX interface.
•
CSCdy22744
Symptoms: The fix for CSCdx47695 that was integrated into Cisco IOS Release 12.0(21)S3
introduced a throttling mechanism that may be used when the physical layer interface module
(PLIM) is congested. The throttling mechanism prevents interfaces or a bundle, or both, from
flapping when bidirectional traffic with small packets is sent through either a 6-port channelized T3
line card or a 2-port channelized OC-3/STM-1 (DS1/E1) line card.
The throttling mechanism produces a severe performance impact, although no link flaps occur.
Conditions: This symptom is observed on a Cisco 12000 series router.
Workaround: There is no workaround. The fix for this caveat consists of a knob for the throttling.
•
CSCdy42383
Symptoms: A router may not load balance traffic properly between two OC-48 Packet over SONET
(POS) Engine 2 (E2) line cards.
Conditions: This symptom is observed on a Cisco 12416 series Internet router that is running
Cisco IOS Release 12.0(21)ST2 and that has two OC-48 POS E2 line cards.
This symptom is observed while the Cisco 12416 has incoming traffic from an Engine 4 (E4) line
card and outgoing traffic is sent through the E2 line card via parallel links. This symptom does not
occur if the incoming card is replaced with an E2 line card.
Workaround: There is no workaround.
•
CSCdy46676
Symptoms: Performance degradation may occur on an Engine 4 plus line card when traffic
engineering (TE) tunnel load balancing is enabled.
Conditions: This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(22.3)S.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2179
Resolved Caveats—Cisco IOS Release 12.0(21)S6
•
CSCdy67945
Symptoms: When you enter a loopback remote line interface configuration command on a 6-port
channelized T3 line card, the command may fail and may cause a T1 connection to flap.
Conditions: This symptom is observed on both American National Standards Institute (ANSI) and
Bell Communications Research (Bellcore) loopbacks on networks that are sensitive to T1 framing
errors.
When you enter the loopback remote line interface configuration command, the line card causes a
brief change of frame alignment (COFA) error. Normally, this error goes unnoticed. However, some
devices react to these errors with an alarm indication signal (AIS). Each time the loopback request
is initiated (that is, if the T1 connection is configured for remote loopbacks each time the T1
connection comes up), the AIS brings the T1 connection down.
Workaround: There is no workaround.
•
CSCdy68292
Symptoms: The following error messages may be generated on a Cisco 12000 series Engine 4 plus
(E4+) OC-192 line card:
SLOT 6: %RX192-3-HINTR: status = 0x4000000, mask = 0x7EFFFF FF - Parity error on
rx_pbc_mem. -Traceback= 4039CEF0 4044ECEC 400C85B0 SLOT 6: %SYS-2-INTSCHED: ’sleep
for’ at level 7 -Process= "CEF IPC Background", ipl= 7, pid= 52 -Traceback= 400CABB8
400B9D24 403F5EB0 4044E040 400CEAE4 400C7108 SLOT 6: %SYS-2-INTSCHED: ’sleep for’ at
level 7 -Process= "CEF IPC Background", ipl= 7, pid= 52 -Traceback= 400CABB8 400B9D24
403F5EB0 4044E040 400CEAE4 400C7108
Cisco Express Forwarding (CEF) on the E4+ OC-192 line card may become disabled, and the
associated port stays in an “Up/Up” state.
Conditions: This symptom is observed on a Cisco 12000 series router that is running the gsr-k4p-mz
image of Cisco IOS Release 12.0(21)S3 or the gsr-p-mz image of Cisco IOS Release 12.0(21)ST2.
Workaround: Enter the microcode reload slot- number global configuration command on the E4+
OC-192 line card.
•
CSCdy74705
Symptoms: Memory corruption may be observed on a Network Processing Engine (NPE-200).
Conditions: This symptom is observed on the NPE-200 of a Cisco router when there is a high traffic
rate with packets that are greater than 1524 bytes in size.
Workaround: Rearrange the port adapters on the router or upgrade to a Cisco IOS release that has
the fix for this symptom.
•
CSCdy78970
Symptoms: A Cisco 12000 series Engine 2 (E2) line card may generate the following error
messages:
SLOT 14: %LCPOS-3-SOP: TX:BadLenCtr. Source=0x1 (Plim), halt_minor0=0x8001 (1000 0000
0000 00sl, s/l=TooShort/long) SLOT 14: %GSR-3-INTPROC: Process Traceback= 400CCE60
400C90F0 40010A24 -Traceback= 4033F424 4044ED54 400C88B0
Conditions: This symptom is observed when you remove and reinsert switch fabric on a Cisco 12000
series router while traffic is flowing.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2180
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S6
•
CSCdz18497
Symptoms: A router may loop indefinitely when a Simple Network Management Protocol (SNMP)
walk is performed against certain objects. The SNMP walk will not cycle if a specific interface is
specified.
Conditions: These symptoms are observed on a Cisco 12000 series that is running Cisco IOS
Release 12.0(21)S2.
Workaround: Reload the router.
•
CSCdz21278
Symptoms: A destination interface may not have a value in the NetFlow cache (that is, the
destination interface may be null), but it should have a value.
Conditions: This symptom is observed when the egress interface is on a Cisco 12000 series Engine 0
line card and a rate limit access list is applied to the egress interface. The rate limit access list may
not cause packets to be dropped, but the destination interface is null in the NetFlow cache.
Workaround: Disable the rate limit on the output interface.
•
CSCdz21375
Symptoms: A memory leak may occur on a line card.
Conditions: This symptom is observed on the line card of a Cisco 12000 series after NetFlow is
disabled on the last interface of a line card that has NetFlow enabled. This symptom is observed
while there are more than 1900 flow records in the NetFlow cache of the line card.
Workaround: Keep NetFlow enabled on at least one interface on the line card.
•
CSCdz25339
Symptoms: An unusually formatted Multicast Source Discovery Protocol (MSDP) packet may cause
a memory corruption to occur and a router to reload.
Conditions: These symptoms are observed on a Cisco router that has a peer relationship with a
vendor router.
Workaround: If this symptom is observed on a Cisco router that has a peer relationship with vendor
router, enter the ip msdp shutdown peer-address global configuration command to shut down the
peer relationship with the vendor router.
•
CSCdz29408
Symptoms: A loss of ping packets may be observed when the IP address of the local interface is
pinged.
Conditions: This symptom is observed on a Cisco 12000 series and is specific to Cisco Quad OC-48
Engine 4 (E4) line cards. This symptom occurs when an access control list (ACL) is applied to the
input of any of the ports on the line card. All of the ports on the line card will exhibit this symptom
as long as an ACL is configured on any one of the ports on the line card.
Workaround: Remove any ACL configuration that applies to any of the ports on the line card.
•
CSCdz32988
Symptoms: The CPU of a Versatile Interface Processor (VIP) may exhibit persistently high CPU
utilization values.
Conditions: This symptom is observed on the CPU of a VIP on a Cisco 7500 series router or
Cisco 12000 series line card and does not directly impact the operation of the router. This symptom
is a rare race condition and may occur with parallel paths. When this symptom occurs, the output of
the show mpls forwarding-table EXEC command may no longer display accurate counters.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2181
Resolved Caveats—Cisco IOS Release 12.0(21)S6
Workaround: There is no workaround. Reload the microcode of the affected line card to restore
normal operation.
•
CSCdz37224
Symptoms: “Alpha” error messages may be observed on the ingress or egress interfaces of a
Cisco 12000 series 4-port OC-12c/STM-4c Packet over SONET (POS) synchronous digital
hierarchy IP services engine line card. The following messages may be displayed on the egress
interface:
%EE48-3-ALPHAERRS: TX ALPHA: ALPHA_CPU_PIPELINE_CTRL_INT error 1 SLOT 2:
%EE48-3-ALPHAPAIR: TX ALPHA: POP PAIR
Conditions: These symptoms are observed if the shape, bandwidth, random detect, or priority value
is configured and if both the set ip-dscp-value quality of service (QoS) policy map configuration
command and the set mpls experimental policy map configuration command are disabled. This
symptom is observed on a Cisco 12016 router that is running the gsr-p-mz image of Cisco IOS
Release 12.0(21)S or Release 12.0(21)ST2a.
Workaround: Remove the transmit (TX) service policy and use Per Interface Rate Control (PIRC)
instead.
Additional Notes: The same symptom may occur when an error recovery is performed for hardware
failures such as data path parity errors. The symptom under those circumstances would be a failed
recovery. There is no workaround for the occurrence of this symptom when an error recovery is
performed.
•
CSCdz42976
Symptoms: Open Shortest Path First (OSPF) adjacencies may be incomplete, and connectivity
across all Engine 2 (E2) interfaces may be affected.
Conditions: These symptoms are observed on a Cisco router after it is loaded with Cisco IOS
Release 12.0(21)ST5.
Workaround: There is no workaround.
•
CSCdz46604
Symptoms: Multilink adjacencies may show up as invalid.
Conditions: This symptom is observed on the Engine 3 (E3) Quad OC-12 line card of a Cisco 12000
series that is running Cisco IOS Release 12.0(21)S3. It may not be possible to clear this symptom
by entering the clear cef line EXEC command or by reloading the microcode on the line card.
Workaround: There is no workaround.
•
CSCdz47189
Symptoms: An Engine 3 (E3) 4-port OC-12 line card (4xOC-12) or an E3 OC-48 Packet over
SONET (POS) line card may reload and generate traceback messages.
Conditions: These symptoms are observed when the gsr-p-mz image of Cisco IOS
Release 12.0(24)S is loaded on a Cisco 12406 router in an Inter Autonomous System Multiprotocol
Label Switching (MPLS) Virtual Private Network (VPN) of an IP version 4 (IPv4) Border Gateway
Protocol (BGP) label distribution environment. The E3 4xOC-12 line card may be operating in
either the channelized mode or the POS mode.
Workaround: No workaround is necessary because the line cards will recover without any user
intervention.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2182
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S6
•
CSCdz54539
Symptoms: An Engine 4 plus line card that is installed in a Cisco 12400 series may be reset by the
Route Processor (RP) because of interprocess communication (IPC) failures. The following errors
may be displayed:
%CPUIF-3-NO_MEM: sendreq_freeq is NULL.
%MDS-2-LC_FAILED_IPC_ACK: RP failed in getting Ack for IPC message of size 148 to LC
in slot 3 with sequence 58638, error = timeout
%FIB-3-FIBDISABLE: Fatal error, slot 3: IPC Failure: timeout
%GRP-4-RSTSLOT: Resetting the card in the slot: 3,Event:
EV_AUTO_LC_RELOAD_ON_FIBDISABLE ]
Conditions: These symptoms are observed when route flapping occurs; route flapping may generate
a high volume of IPC traffic.
Workaround: There is no workaround.
•
CSCdz55944
Symptoms: A Cisco 12410 switch fabric card (SFC) may not come up after a software upgrade.
Conditions: This symptom is observed on a Cisco 12410 SFC that is upgraded to Cisco IOS
Release 12.0(21)S5.
Workaround: There is no workaround.
•
CSCdz55995
Symptoms: Packet or byte counters may not be accurate when a parity error occurs on a line card.
Conditions: This symptom is observed on a Cisco 12000 series router that has an Engine 4 (E4) line
card.
Workaround: There is no workaround.
•
CSCdz60229
Cisco devices which run IOS and contain support for the Secure Shell (SSH) server are vulnerable
to a Denial of Service (DoS) if the SSH server is enabled on the device. A malformed SSH packet
directed at the affected device can cause a reload of the device. No authentication is necessary for
the packet to be received by the affected device. The SSH server in Cisco IOS is disabled by default.
Cisco will be making free software available to correct the problem as soon as possible.
The malformed packets can be generated using the SSHredder test suite from Rapid7, Inc.
Workarounds are available. The Cisco PSIRT is not aware of any malicious exploitation of this
vulnerability.
This advisory is available at http://www.cisco.com/warp/public/707/ssh-packet-suite-vuln.shtml
•
CSCdz69362
Symptoms: Tag forwarding counters may no longer function when parity errors occur on an
Engine 4 plus (E4+) line card.
Conditions: This symptom is observed on a Cisco 12000 series router.
Workaround: There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2183
Resolved Caveats—Cisco IOS Release 12.0(21)S5
•
CSCdz71662
Symptoms: A router may fail because of a bus error.
Conditions: This symptom is observed if the show environment all EXEC command or the show
environment internals EXEC command is entered while an online insertion and removal (OIR)
procedure is in progress.
Workaround: Do not enter the show environment all EXEC command or the show environment
internals EXEC command while an OIR is in progress.
•
CSCdz72790
Symptoms: Links may not come up as expected on a 2-port channelized OC-3/STM-1(DS1/E1) line
card (2CHOC3/STM1-IR-SC).
Conditions: This symptom is observed on the 2CHOC3/STM1-IR-SC line card of a
Cisco 12000 series router.
Workaround: There is no workaround.
•
CSCdz74588
Symptoms: Traffic on a load-sharing path may be switched to the wrong destination or dropped
altogether.
Conditions: This symptom is observed when a Cisco 12000 series Engine 4 (E4) line card is on the
ingress side, there is a load-sharing path or multiple paths on the egress side, and a hidden class of
service (CoS) global configuration command is configured on the router.
Workaround: Remove the extra load-sharing paths, and make it one single outgoing path.
•
CSCea00096
Symptoms: Packet throttling is activated because of congestion, even when not configured as shown
by the following error message:
%LC_CX3-4-THROTTLE: Packet throttling activated due to congestion
Conditions: This symptom is observed on a Cisco 12416 router that is configured with 200 Border
Gateway Protocol (BGP) peers containing three 6xCT3 line cards, each configured with an even
distribution of ~1500 frame relay subinterfaces.
Workaround: There is no workaround.
•
CSCea00954
Symptoms: IP Multicast hardware counter memory is not freed on an Engine 4/4 plus line card after
multicast routes are cleared from the routing table.
Conditions: This symptom only occurs when the Engine 4/4 plus line card runs out of mtrie node
memory, for example when the routes in the router are more than the line card can handle.
Workaround: There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(21)S5
Cisco IOS Release 12.0(21)S5 is a rebuild of Cisco IOS Release 12.0(21)S. The caveats listed in this
section are resolved in Cisco IOS Release 12.0(21)S5 but may be open in previous Cisco IOS releases.
This section describes only severity 1 and 2 caveats.
•
CSCdw41164
Symptoms A Versatile Interface Processor (VIP) may reload because of an error at the
ct3sw_check_tx process.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2184
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S5
Conditions This symptom is observed on a Cisco 7000 series VIP that is running Cisco IOS
Release 12.0(16)S4.
Workaround There is no workaround.
•
CSCdw42422
Symptoms All of the incoming packets may be punted to the line card CPU. This situation may cause
most of the traffic to be dropped because of the limited processing capability of the line card CPU.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(20.3)ST2. The symptom occurs in a Multiprotocol Label Switching
(MPLS) Virtual Private Network (VPN) environment, if the ingress line card of a provider router is
an Engine 4 Plus (E4+) line card.
Workaround There is no workaround.
•
CSCdw46156
Symptoms An interface of an Engine 4 Plus (E4+) line card stops receiving Intermediate
System-to-Intermediate System (IS-IS) updates.
Conditions This symptom is observed in Cisco IOS Release 12.0(20.3)ST when you configure a
maximum transmission unit (MTU) size that is smaller than 4558 on both sides of the link and after
you enter the shutdown interface configuration command followed by the no shutdown interface
configuration command on the interface of the E4+ line card.
Workaround Reload microcode onto the line card.
Alternate Workaround Change the size of the MTU in the interface to any other value than 4558.
•
CSCdx09973
Symptoms Tracebacks may be displayed, and critical alarms may be raised after an online insertion
and removal (OIR) procedure.
Conditions This symptom is observed on a Cisco 12410 router that is running Cisco IOS
Release 12.0(21)S1.
Workaround There is no workaround.
•
CSCdx13872
Symptoms Per VLAN byte counters display inaccurate statistics.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)S1 or Release 12.0(21)S3 with an installed 1-port Gigabit Ethernet line
card.
Workaround There is no workaround.
•
CSCdx19855
Symptoms A router may reload.
Conditions This symptom is observed during the execution of the no e1 1 channel-group 0
command on the controller of a Multi-Channel E3 port adapter on a Cisco 7200 series router that is
configured for IP routing.
Workaround Shut the interface down and then remove the channel group.
•
CSCdx25179
Symptoms The following error message is seen with a channelized 1-port SONET OC-12
STS-3c/STM-1 line card:
04:22:28: %GRPPOS-3-OP: Interface (POS1/0:1): unknown event - 26
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2185
Resolved Caveats—Cisco IOS Release 12.0(21)S5
Traffic passes through the router normally after this message is displayed. However, Frame Relay
virtual circuit (VC) statistics may be inaccurate.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with a 1-port
SONET OC-12 STS-3c/STM-1 line card when Frame Relay traffic is passing through the line card.
Workaround There is no workaround.
•
CSCdx35920
Symptoms Service Assurance Agent (SAA) latency measurements may show unrealistic spikes.
Conditions This symptom is observed when Border Gateway Protocol (BGP) is running on a router.
Workaround Use the Jitter Probe, which requires the Response Time Reporter (RTR) responder to
be running on the remote Cisco router.
•
CSCdx53795
Symptoms If a peer advertises a replacement path (with the same multi-exit discriminator [MED] as
the original path), the new path is inserted in the previous position of the original path.
Conditions This symptom may be observed on a Border Gateway Protocol (BGP) router that is using
deterministic MED. When this symptom occurs, the replacement path may not be grouped with
paths from the same autonomous system number (ASN). This ordering may result in incorrect
routing and may cause routing loops.
Workaround Disable and reenable deterministic MED on the router after the router enters the
incorrect state.
•
CSCdx71843
Symptoms Loopback fails on engine 2 line cards.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.3)S2.
Workaround There is no workaround.
•
CSCdx85342
Symptoms A Route Processor (RP) may boot up with the boot helper image instead of the regular
image, or a Cisco 12000 series line card that is configured under the primary RP may reset because
of interprocess communications (IPC) failures and generate the following error message:
* UTC: %FIB-3-FIBDISABLE: Fatal error, slot 0: IPC Failure: timeout
The two above mentioned symptoms are mutually exclusive.
Conditions These symptoms are observed on a Cisco 12000 series router when the router is
configured with a primary RP and a standby RP and you load the gsr-boot-mz image from Bootflash
using the boot system tftp global configuration command.
The symptoms affect only the gsr-boot-mz image (the gsr-p-mz image is not affected) and may occur
in the following Cisco IOS releases:
– 12.0(20.3)S
– 12.0(20.3)S1
– 12.0(20.3)ST
– 12.0(20.3)ST1
– 12.0(20.3)ST2
– 12.0(20.3)ST3
– 12.0(20.4)S
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2186
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S5
– 12.0(20.4)S1
– 12.0(20.4)S2
– 12.0(20.4)ST
– 12.0(20.4)ST1
– 12.0(20)ST
– 12.0(20)ST1
– 12.0(20)ST2
– 12.0(20)ST3
– 12.0(20)ST4
– 12.0(20)ST5
– 12.0(21.1)S
– 12.0(21.1)S1
– 12.0(21.1)S2
– 12.0(21.1)S3
– 12.0(21.2)S
– 12.0(21.3)S
– 12.0(21.3)S1
– 12.0(21.3)S2
– 12.0(21.3)S3
– 12.0(21.4)S
– 12.0(21.4)S2
– 12.0(21.4)S3
– 12.0(21)S
– 12.0(21)S1
– 12.0(21)S2
– 12.0(21)S3
– 12.0(21)S4
– 12.0(21)ST
– 12.0(21)ST1
– 12.0(21)ST2
– 12.0(21)ST3
– 12.0(21)ST4
– 12.0(22)S
– 12.0(22.1)S
Workaround Use a gsr-boot-mz boot image that was released earlier than Release 12.0(20.3)S or
later than Release 12.0(22.1)S.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2187
Resolved Caveats—Cisco IOS Release 12.0(21)S5
•
CSCdx87577
Symptoms Memory allocation failures occur on a Cisco router that has authentication, authorization,
and accounting (AAA) configured, and “%SYS-2- MALLOCFAIL” messages are displayed. When
you enter the show memory summary command, the command output shows that many small
blocks are used by the AAA processes.
Conditions This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(15)S3.
Workaround There is no workaround.
•
CSCdx94390
Symptoms The following error message appears on a Cisco 12000 series Internet router when you
enable a turbo access control list (Turbo ACL):
%SYS-2-MALLOCFAIL: Memory allocation of 10980020 bytes failed from 0x400BE22C,
alignment 32
Pool: Processor Free: 25912464 Cause: Memory fragmentation
Alternate Pool: None Free: 0 Cause: No Alternate pool
-Process= "TurboACL", ipl= 0, pid= 41
-Traceback= 400BB150 400BD4E4 400BE234 40BCDBE4 40BCDA70 40BCDAB8 40BCDAB8 40BCD97C
40BCFD00 40BD1650 400B3DFC 400B3DE8
Conditions This symptom is observed on a a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21.4)S2 and that is configured with an 8-port Fast Ethernet 100-Base-TX
interface with 128 MB of route memory.
Workaround Turn off compiled access lists using the no access-list compiled global configuration
command.
•
CSCdy03640
Symptoms A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)ST1
displays the following error message when Sampled NetFlow (SNF) is configured:
SLOT 1:Jun 12 06:10:32.526 UTC: %LC-3-BMACMDRPLY: Problem in BMA reply to command type
128 ToFab BMA sequence no=020 92 00 44 06 3C 20 01 07 68
Conditions This symptom is observed only on Cisco 12000 series routers that are configured with
3-port Gigabit Ethernet line cards.
Workaround Disable Netflow.
•
CSCdy12947
Symptoms Reverse Path Forwarding (RPF) checks fail, and multicast packets are dropped from an
incoming interface.
Conditions This symptom is observed on a Cisco 12000 series router that is configured with a 3-port
Gigabit Ethernet line card that has dot1Q encapsulation enabled.
Workaround Enter the hw-module slot number ip multicast hw-accelerate global configuration
command on the router.
•
CSCdy16540
Symptoms An incoming multicast traffic stream on an Engine 4 or Engine 4+ line card is not
forwarded.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S4 and that is configured with an Engine 4 or Engine 4+ line card when traffic is
first received through a non-Reverse Path Forwarding (RPF)-enabled interface during route setup and
then through an RPF-enabled interface.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2188
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S5
Workaround Enter the clear ip mroute group source privileged EXEC command to reset the state
of the multicast traffic stream and clear the symptom.
•
CSCdy24389
Symptoms An Engine 2 POS or Gigabit Ethernet line card reloads when the ip multicast-routing
distributed command is enabled.
Conditions This symptom is observed on a router that is running Cisco IOS Release 12.0(22.2)S.
Workaround There is no workaround.
•
CSCdy27220
Symptoms A ciscoEnvMonRedundantSupplyNotification trap is not generated when a power supply
is shut down, and a notification message is not displayed on a Cisco 12000 series Internet router.
Conditions This symptom is observed on the following Cisco 12000 series routers that run
Cisco IOS Release 12.0(21)S3:
– Cisco 12016 router
– Cisco 12404 router
– Cisco 12406 router
– Cisco 12410 router
– Cisco 12416 router
Workaround There is no workaround.
•
CSCdy29769
Symptoms A line card reloads with a bus error when the dir system: command is issued on that line
card.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S3 or an earlier release. This symptom has not been observed with Engine 2 line
cards.
Workaround There is no workaround.
•
CSCdy30484
Symptoms An Engine 2 3-port Gigabit Ethernet line card that receives a tag packet with a Time to
Live (TTL) value of 1 may reload.
Conditions This symptom is observed on a Cisco 12000 series router.
Workaround There is no workaround.
•
CSCdy34017
Symptoms An access control list (ACL) with an Internet Control Message Protocol (ICMP) entry
may be incorrectly processed by (the packet switch ASIC [PSA] of) an Engine 2 line card.
Conditions This symptom is observed on a Cisco 12000 series Engine line card when an ACL entry
matches an ICMP packet that is specifying its type but not its code.
Workaround Specify the code in all ICMP entries.
•
CSCdy34581
Symptoms A Cisco 12000 series router may reload because of a memory corruption.
Conditions This symptom is observed during the configuration of traffic shaping.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2189
Resolved Caveats—Cisco IOS Release 12.0(21)S5
•
CSCdy38827
Symptoms A Cisco router may install a suboptimal Intermediate System-to- Intermediate System
(IS-IS) route into its routing table. Depending on the topology, this situation may create a routing
loop.
Conditions This symptom is observed on an IS-IS Level 1 - Level 2 (L1L2) router that is running
Cisco IOS Release 12.0 S or Release 12.0 ST and that has prefixes configured that are allowed to be
leaked into Level 1, that is, prefixes that match the access list that is specified within the
redistribute isis ip level-2 into level-1 distribute-list command. When route leaking is not
configured, this condition is not observed.
Workaround There is no workaround. The condition resolves itself when the affected route is cleared
by entering the clear ip route network EXEC command.
•
CSCdy44251
Symptoms The Forwarding Information Base (FIB) table on a Cisco 12000 series Gigabit Route
Processor (GRP) may be missing entries for directly connected subnets.
Conditions This symptom is observed on a Cisco 12000 series router after you have removed a large
number of routes.
Workaround Enter the clear ip route network for the affected prefixes. The following is an example:
b2# show ip cef 10.2.0.4 255.255.255.224
%Prefix not found
b2# clear ip route 10.2.0.4 255.255.255.224
b2# show ip cef 10.2.0.4 255.255.255.224
10.2.0.4/30, version 285154, epoch 0, attached, connected, cached adjacency to POS1/0
0 packets, 0 bytes via POS1/0, 0 dependencies valid cached adjacency
•
CSCdy44256
Symptoms Tag forwarding does not function properly for incoming tagged packets that correspond
to Border Gateway Protocol (BGP) next-hop prefixes.
Conditions This symptom is observed on a Cisco 12000 series router with an ingress Engine 4+ line
card that is running Cisco IOS Release 12.0(21)S. This symptom does not affect incoming IP
packets.
Workaround There is no workaround.
•
CSCdy47173
Symptoms A Route Processor (RP) may reload when you install a Flash card in slot 1 of the RP.
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
•
CSCdy67171
Symptoms The IP address of an interface that is placed in a passive state, with the passive-interface
default router configuration command, is not advertised to Intermediate System-to-Intermediate
System (IS-IS) neighbors.
Conditions This symptom is observed only when a router is first booted.
Workaround Reenter the passive-interface default command under IS-IS router configuration
mode.
•
CSCdy78808
Symptoms An Engine 2 line card displays a “QM-4-STUCK” error message. The line card can also
stop forwarding traffic.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2190
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S5
Conditions This symptom is observed when an adjacent router is power cycled or a line card on an
adjacent router is removed and reinserted.
Workaround Perform a microcode reload on the affected Engine 2 line card.
•
CSCdy81738
Symptoms Routes in the Cisco Express Forwarding (CEF) table on a Cisco 12000 series Gigabit
Route Processor (GRP) do not match the routes in a line card CEF table. The mismatched routes can
be cleared with the clear cef linecard privileged EXEC command. However, this symptom reoccurs
when the mismatched routes are learned again.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(21)S4 or Release 12.0(22)S and has an access-list configured to deny
Simple Network Management Protocol (SNMP).
Workaround Deconfigure the access-list that denies SNMP, or install Cisco IOS Release 12.0(21)S3
instead of 12.0(21)S4 or 12.0(22)S.
•
CSCdy86210
Symptoms NetFlow stops functioning after an online insertion and removal (OIR) procedure is
performed on a Switch Fabric Card (SFC).
Conditions This symptom is observed on a Cisco 12000 series Internet router.
Workaround Deconfigure and reconfigure the ip route-cache flow sampled interface configuration
command.
•
CSCdy89001
Symptoms An Engine 4 Packet-over-SONET (POS) line card reloads.
Conditions This symptom is observed on an Engine 4 Packet-over-SONET (POS) line card in a
Cisco 12000 series Internet router during several online insertion and removal (OIR) procedures on
a Clock Scheduler Card (CSC).
Workaround There is no workaround.
•
CSCdy89663
Symptoms A router reloads when an interface flaps.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running Cisco
IOS Release 12.0(21)S and multicast traffic is present on the router.
Workaround There is no workaround.
•
CSCdz07976
Symptoms An Engine 2 line card continuously reloads if an adjacent is power cycled.
Conditions This symptom is observed on an Engine 2 line card in a Cisco 12000 series Internet
router that is configured to run the Border Gateway Protocol (BGP) Policy Accounting feature on
the line card. This symptom occurs when accounted traffic is passing through the card.
Workaround There is no workaround.
•
CSCin15495
Symptoms The output counters that are associated with an interface may remain zero, even though
traffic is passed through the interface.
Conditions The conditions under which this symptom occurs are not known at this time.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2191
Resolved Caveats—Cisco IOS Release 12.0(21)S4
Resolved Caveats—Cisco IOS Release 12.0(21)S4
Cisco IOS Release 12.0(21)S4 is a rebuild release for Cisco IOS Release 12.0(21)S. The caveats in this
section are resolved in Cisco IOS Release 12.0(21)S4 but may be open in previous Cisco IOS releases.
•
CSCdt41343
Symptoms A router may reload.
Conditions This symptom is observed when the configuration of the router is directly written from
TFTP to NVRAM or from Cisco IOS Release 12.0 and, in both cases, when a syslog server and
syslog source interface have been defined before the source interface has been parsed.
Workaround Place the syslog server and syslog source interface configurations after the source
interface itself. To do this, you have to edit the configuration offline, copy it to NVRAM, and then
reboot.
•
CSCdu00328
Symptoms A Cisco 7500 series router may stop receiving packets on certain interfaces when a Cisco
6500 series switch that is connected through a port channel is reloaded.
Conditions This symptom is observed on a Cisco 7500 router that is connected to a Cisco 6500 series
switch through the port channel. This symptom does not occur if the port channel is removed.
Workaround Run normal IP between the Cisco 7500 series router and the Cisco 6500 series switch
without the port channel configuration.
•
CSCdv11028
Symptoms A queue may become stuck and display messages that are similar to the following:
%GRP-3-FABRIC_UNI: Unicast send timed out
%QM-4-STUCK: Port 0 Queue mask 0x1
Conditions This symptom is observed when an OC-48 Packet-over-SONET (POS) interface is
flapping and when updates are received.
Workaround Perform a microcode reload of the line card.
•
CSCdw88747
Symptoms An Engine 4 (E4) or Engine 4 Plus (E4+) line card stops responding and may be reset by
the Route Processor.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running Cisco
IOS Release 12.0(22)S or an earlier release if distributed multicast routing is enabled in the router.
Workaround Use Cisco IOS Release 12.0(22)S.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2192
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S4
•
CSCdx03185
Symptoms A router may reload when it is searching the Resource Reservation Protocol (RSVP)
database.
Conditions This symptom is observed on a Cisco router that is running in the Route Processor
Redundancy Plus (RPR+) or the Stateful SwitchOver (SSO) mode. The router reloads when a tunnel
is up and when Multiprotocol Label Switching-traffic engineering (MPLS-TE), Cisco Express
Forwarding (CEF), and IP routing are unconfigured using the following sequence of commands:
no tag advertise-tags
no mpls ip
no mpls label protocol ldp
no ip routing
no ip cef
no mpls traffic-eng tunnels
Workaround Issue the no mpls traffic-eng tunnels router configuration command to shut down all
tunnels before issuing the no ip routing global configuration command.
•
CSCdx11084
Symptoms An ATM OC-12 interface on a Cisco 7500 series port adapter shows output drops that
cannot be accounted for anywhere else in the router. None of the permanent virtual connections
(PVCs) show any drops, but the interface still accumulates drops.
Conditions This symptom is observed when the traffic rate is very low compared to line rate of the
port adapter.
Workaround There is no workaround.
•
CSCdx29393
Symptoms Cisco Express Forwarding (CEF) may be disabled on a line card.
Conditions This symptom is observed if a 16-port OC3 Engine 2 line card is configured with 16
different input access control lists (ACLs) while there are 100K Border Gateway Protocol (BGP)
routes present.
Workaround There is no workaround.
•
CSCdx38188
Symptoms Certain IP Services Engine (ISE) optical carrier (OC-3) concatenated line cards may fail
to initialize and pause indefinitely at the IOS_STRT process when startup occurs.
Conditions This symptom is observed only on 16-port line cards that are shipped with optical
modules when releases prior to Cisco IOS Release 12.0(22)S are used. The 16-port line cards that
are affected by this symptom have optical modules that are silver and grey in color. The 16-port line
cards that are not affected by this symptom have optical modules that are light blue in color.
Workaround Use Cisco IOS Release 12.0(22)S, 12.0(21)S4, 12.0(21)ST3, or a later Cisco IOS
release.
•
CSCdx39018
Symptoms The ifOutOctets counter may decrease over a five-minute interval, but the counter is still
accurate on a long term basis.
Conditions This symptom is observed on a Cisco 7500 series router when quality of service (QoS)
is configured on the egress Versatile Interface Processor (VIP).
Workaround Disable QoS.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2193
Resolved Caveats—Cisco IOS Release 12.0(21)S4
•
CSCdx51317
Symptoms A 4-port OC-12/STM-4 ATM multimode, signaling controller connector line card
(4OC12/ATM-MM-SC) may reload because of a bus error exception.
Conditions This symptom is observed when a 127-line standard output access control list (ACL) is
configured on another Engine 2-based line card.
Workaround There is no workaround.
•
CSCdx60213
Symptoms A Gigabit Ethernet line card port may reload if a port on the line card is reset while a
switch is connected.
Conditions This symptom is observed on a Cisco 12000 series 3-port Gigabit Ethernet line card if a
port on the 3-port Gigabit Ethernet line card is reset while a Catalyst switch is connected.
Workaround There is no workaround.
•
CSCdx65248
Symptoms Cisco Express Forwarding (CEF) may be disabled on an ATM OC-3 line card after a
memory leak occurs.
Conditions This symptom is observed on an ATM OC-3 line card.
Workaround There is no workaround.
•
CSCdx69170
Symptoms An access list on a router may drop or forward traffic incorrectly.
Conditions This symptom is observed on a Cisco 12000 series Internet router when an input or
output access control list (ACL) is enabled on an Engine 2 line card (QOC12 POS, 1xOC48 POS,
OC48 DPT, 16xOC3 POS, or 3xGE).
Workaround There is no workaround.
•
CSCdx69852
Symptoms Cisco Express Forwarding (CEF) may be disabled on one or more line cards that are
installed on a router after the redundancy force-failover EXEC command is entered.
Conditions This symptom is observed on a Cisco 12416 router that is running Cisco IOS
Release 12.0(17)S5 with redundant Gigabit Route Processors (GRPs).
Workaround There is no workaround.
•
CSCdx74709
Symptoms The Ring Access Controller (RAC) watchdog timer expires and forces the RAC to enter
the pass-through mode.
Conditions This symptom typically occurs when CPU utilization remains at 100 percent for more
than 90 seconds.
Workaround There is no workaround.
•
CSCdx76645
Symptoms A backup clock switched card 0 (CSC 0) may enter the “going on” state.
Conditions This symptom is observed when an online insertion and removal (OIR) is performed on
a Cisco 12406 router with the primary clock on CSC 1 (slot 17).
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2194
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S4
•
CSCdx84445
Symptoms A line card may be stuck in the off-for-download state.
Conditions This symptom is observed on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(21)S2. This symptom may be indicated in the output of the show cef linecard EXEC
command.
Workaround There is no workaround.
•
CSCdx86014
Symptoms Some E3 NetFlow export datagrams may not reach the collector because the line card
failed to export the datagrams.
Conditions This symptom is observed when sampled NetFlow is configured on an IP Services
Engine (ISE) line card on a Cisco 12416 router.
Workaround There is no workaround.
•
CSCdx86907
The following caveat describes two symptoms, two conditions, and two workarounds:
Symptom A An access control list (ACL) does not operate correctly to match Layer 4 Operation
(L4Op) entries. The ACL clears the logical operator unit (LOU) while it is still being used by other
interfaces.
Condition A This symptom is observed when an ACL is removed from one interface after the ACL
is applied to multiple interfaces.
Workaround A Remove the ACL from all interfaces to which the ACL has been applied and reapply
the ACL to the interfaces as needed.
Symptom B A ternary content addressable memory (TCAM) LOU capacity error may occur even
though the number of used LOUs in the existing ACLs is less than the set limit.
Conditions B This symptom is observed when two different ACLs are applied to two different
interfaces (ACL A on interface A and ACL B on interface B). When ACL A is applied to interface
B, the LOU from ACL B is not cleared. This behavior causes LOUs to be wasted in TCAM.
Workaround B First remove ACL B from the interface, and then reapply ACL A to that interface.
•
CSCdx90950
Symptoms A Cisco 12416 Internet router reloads after the power supply is turned off.
Conditions This symptom is observed on a Cisco 12416 Internet router that is running Cisco IOS
Release 12.0(21)S3 when the snmp-server enable traps envmon global configuration command or
the snmp-server enable traps envmon supply global configuration command is enabled.
Workaround There is no workaround.
•
CSCdx93629
Symptoms The following error messages may be displayed on a router:
-Traceback= 403503E0 403504FC 40356E34 4035779C 403579B0 400B3DFC400B3DE8
SLOT 8:00:28:00: %EE48-5-TM_PROC: TCAM Delete Invalid Parameters(35),
Alpha:RX Lbl:4099 Appl:2 fail: 35
-Traceback= 403503E0 403504FC 40356E34 4035779C 403579B0 400B3DFC400B3DE8
The access control list (ACL) stops functioning properly after this symptom occurs.
Conditions This symptom is observed if the same ACL is applied to multiple interfaces on an IP
Service Engine (ISE) that is installed on a Cisco 12000 series Internet router.
Workaround There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2195
Resolved Caveats—Cisco IOS Release 12.0(21)S3
•
CSCdy05017
Symptoms An Engine 2 line card may reload.
Conditions This symptom is observed when tag switching is enabled on a Cisco 12000 series
Internet router that has Engine 2 line cards while load balancing is occurring in the Cisco Express
Forwarding (CEF) path.
Workaround There is no workaround.
•
CSCdy06328
Symptoms The memory usage of a Cisco 12000 series Route Processor (RP) is very high.
Conditions This symptom is observed on a Cisco 12000 series Internet router that is running the
gsr-p-mz image of Cisco IOS Release 12.0(21)S1 and that is configured with an IP Services Engine
(ISE) line card with v8 NetFlow enabled.
Workaround There is no workaround.
•
CSCin13850
Symptoms A router may stop passing packets.
Conditions This symptom is observed on a 1-port clear channel E3 port adapter (PA-E3) or a 1-port
clear channel DS3 port adapter (PA-T3) port adapter that is installed on a Cisco 7500 router that is
running Cisco IOS Release 12.0(21)S3.
Workaround There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(21)S3
Cisco IOS Release 12.0(21)S3 is a rebuild of Cisco IOS Release 12.0(21)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(21)S3. This section describes only severity 1 and 2
caveats.
•
CSCds52920
The logging source-interface for syslogging must be set to work correctly. On certain platforms, this
breaks the IOS copy run start EXEC command and the write mem EXEC command prohibiting
the saving of configurations to the system database. There is no workaround.
•
CSCdu38436
Clocking problems and link instability resulting from the fact that the default transmit clock source
changes to internal when a link is added to an IMA group may occur on a Cisco 7200 or Cisco 7500
router with a PA-A3-8T1IMA port adapter installed and configured for Inverse Multiplexing over
ATM (IMA).
This can be seen by using the show controller atm X/Y EXEC command for each T1 interface that
is included in the IMA group. If the txtiming field is 0xA, the link is clocking from Line. If the
txtiming field is 0xE, the link is clocking from Internal.
Customers who suffer from T1 links that are part of an IMA group that flaps periodically may
experience this condition. If the link is removed from the IMA group or if the workaround is applied
and the link still flaps, the condition is unrelated to this caveat.
Workaround: Enter the shut down voice-port configuration command to shut down each of the ports
in the IMA group. Enter the no ima-group group number interface configuration command to
remove each of the ATM interfaces from the IMA group. Enter the clock source line {primary |
secondary} controller configuration command to configure the clock source to be line on each of
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2196
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S3
the ports. Enter the ima-group group number command to add the links back to the IMA group.
Enter the no shut down voice-port configuration command on the interfaces. If the router is
reloaded, the links will return to internal clocking and the workaround will have to be applied again.
•
CSCdv34564
“MUESLIX” errors that affect the capability of the router to route traffic may occur on a Cisco 7200
series router that is running Cisco IOS Release 12.0(14)S3 and that has a PA-8T-V35 serial port
adapter. There is no workaround.
•
CSCdv40244
The following continuous stream of “%POT1E1-3-FWFATAL” error messages may occur on a
router:
%POT1E1-3-FWFATAL: Bay 5: firmware needsresetdue to fw watchdog timeout %
POT1E1-3-FWFATAL: Bay 4: firmware needsresetdue to fatal softwareerrors
This symptom is observed on a Cisco 7206VXR router that is using an eight-port multichannel T1
port adapter (PA-MC-8T1). There is no workaround.
•
CSCdv84788
A Versatile Interface Processor (VIP) may reload or record spurious access after class maps are
configured for Frame Relay. There is no workaround.
•
CSCdv90022
After you enter the shutdown command followed by the no shutdown command on a Cisco 2000
series Internet router, the Route Processor stops receiving traffic. This occurs if a default route is
configured over the Ethernet 0 interface for management purposes. This configuration is not
recommended as the Ethernet interface is not designed to switch traffic.
Workaround: Configure the default IP route as ip route 0.0.0.0 0.0.0.0 x.x.x.x (that is, the IP address
of the next-hop router interface).
•
CSCdw53512
In Cisco IOS Release 12.0 S, when the number of interfaces is greater than the value of max routes,
the excessive interfaces can still can be configured in a subnet. There is no workaround.
•
CSCdw61739
When a PA-MC-STM1 port adaptor is configured for framed or unframed mode, you may see several
aborts in some channels.
Workaround: Follow the steps below:
1. Configure the network payload loopback on the E1 channel on which you are seeing the condition.
2. Configure another E1 channel on another synchronous payload envelope (SPE).
3. Unconfigure the payload loopback.
•
CSCdw86735
On a Cisco 12008 Internet router with an oc48/POS-SM line card, the following error message
occurs each time an access control list (ACL) is applied inbound when a sampled NetFlow is also
present on the interface:
SLOT 2:Feb 22 05:42:28.160 MET: %LC-3-BMACMDRPLY: Problem in BMA reply to command type
128 ToFab BMA sequence no=1
Workaround: Disable either the sampled netflow or the ACLs on the interface.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2197
Resolved Caveats—Cisco IOS Release 12.0(21)S3
•
CSCdw89164
A memory allocation failure (MALLOCFAIL) message is displayed when a cable is unplugged from
a serial interface. This symptom is observed on a Cisco 7206VXR router that is running Cisco IOS
Release 12.2(7a) and that has a Network Processing Engine (NPE-400). This situation occurs when
a cable is unplugged from a serial interface and if the l3 bypass global configuration command is
enabled. There is no workaround.
•
CSCdx01516
If you reoptimize the multihop tunnels on a Cisco 12000 series Internet router that has 400
Multiprotocol Label Switching (MPLS) multihop tunnels configured and an Engine 3 line card that
forms one of the links in the path, the first Rx port on the Engine 3 line card may become stuck.
There is no workaround.
•
CSCdx10480
When Universal Transport Interface (UTI) and per-packet load balancing (PPLB) are enabled on the
same E2 line card, the line card stops forwarding packets.
Workaround: Reload the Cisco 12000 series Internet router.
•
CSCdx16940
E4 cannot forward traffic to a one-hop tunnel when the tag ip is enabled. There is no workaround.
•
CSCdx17230
Multiprotocol Label Switching (MPLS) packets that are switched by an Engine 3 card may get
corrupted. There is no workaround.
•
CSCdx32108
The E4 load-balancing hash does not evenly distribute the source IP address between the incoming
IP packet (src) and the destination IP address in the incoming IP packet (dst) pairs. There is no
workaround.
•
CSCdx32658
On a Cisco 12000 series Internet router, if you ping the loopback address from the west-end to the
east-end router, datagrams are dropped. The first packet size ranges to fail are the packets between
77 and 80 and between 605 and 608. Only these packet ranges are being dropped; all other packets
get through. There is no workaround.
•
CSCdx36730
In the following setup,
7500--GE back to back-- 12000-8 ----OC48 POS --- 12000-7 --FE - 7200-20
when the output committed access rate (oCAR) is enabled on Cisco 12000-8 router on the GE
interface, pings with do-not-fragment (DF) oCAR bits set greater than the GE maximum
transmission unit (MTU) are incorrectly passed and incorrectly responded to. For example, the ping
from the Cisco 12000-7 router is responded to with 2000-byte pings.
In addition, when pinging with a 1500-byte MTU, giants are seen at the Cisco 7500 router GE
interface.
The condition exists only when oCAR is configured on egress 1PGige. 1PGige and 8FE fall under
the same code base for oCAR handling.
Workaround: Set the interface MTU to +10; that is, for a normal ip payload of 1500, set the interface
MTU to 1512.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2198
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S3
•
CSCdx38857
When the IP Service Engine 3 (ISE) forwarding hardware (ALPHA) is restarted because of certain
error conditions, the Sampled Netflow may not work anymore.
Workaround: Reconfigure the sampling interval using the ip flow-sampling-mode packet-interval
value global configuration command.
•
CSCdx38981
When the MQC policy command is combined with MQC bandwidth, priority or shape command
on an output ISE interface, traffic stops completely on that interface. The configuration must be
removed and the card must be reloaded to clear the loss of packet buffers. There is no workaround.
•
CSCdx40337
When a suspended Telnet session is “resumed” using the resume EXEC command, with or without
arguments, the system may unexpectedly reload with an ALIGN-1-FATAL error at address 0x0.
Workaround: Do not use the resume EXEC command to restore the Telnet session. Just press Enter
on your keyboard.
•
CSCdx42432
When unicast Reverse Path Forwarding (uRPF) is enabled on an interface and then an access control
list (ACL) is applied, the ACL does not function properly.
Workaround: Apply the ACL before enabling the uRPF or disable and then re-enable the uRPF.
•
CSCdx42637
A router flushes link-state advertisements (LSAs) that have not been refreshed for more than
50 minutes. This symptom is observed on a Cisco router that is running Cisco IOS
Release 12.0(19)ST1. There is no workaround.
•
CSCdx43239
If a Cisco 12000 Route Processor runs out of memory, it may soon reload.
There is no workaround.
•
CSCdx45298
A Cisco Express Forwarding (CEF) inconsistency may occur between the Gigabit Route Processor
(GRP) and the Engine 2 line card. This inconsistency causes flapping and has been observed when
there are recursive prefixes and suboptimal line quality.
Workaround: Clear the CEF line card X.
•
CSCdx50050
When SNF is enabled on an ingress Cisco 12000 series Internet router engine 0 or engine 1 line card
and output access control list (ACL) is enabled on an egress Cisco 12000 series Internet router
engine 3 or 4+ line card, output ACL is performed on the ingress line card for all packets, even
though it is needed only for packets that are selected by sampled NetFlow. It reduces the forwarding
performance of the ingress engine 0 or 1 line card. There is no work around.
•
CSCdx59353
Spurious memory access may appear when the E4+ (OC192 ES) line cards come up and the
Cisco IOS software and BGP start to exchange information and if Multiprotocol Label Switching
(MPLS) virtual private network (VPN) is configured in the routers. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2199
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdx67286
When output access control lists (ACLs) are configured on an IP Service Engine 3 (ISE) line
card (LC), a flag is set on ingress LC indicating that the output ACL processing will be done on the
egress LC.
If the ingress LC is an E2 with the 128 or 448 ACL feature code loaded, when the clear cef linecard
EXEC command is issued, traffic passing through the card that egresses on the ISE line card is
punted to the E2 LC CPY. The LC CPU goes approximately 100 percent utilization and remains
there until the line card is reloaded or the E2 feature code is changed. Traffic may be dropped as a
result. To check which feature code is active, use the execute-on {slot slot-number | show
controller | psa feature} privileged EXEC command.
Workaround: Reload the E2 LC or remove any ingress ACLs from the E2 LC.
•
CSCdx73084
On Cisco 12000 series Internet router line cards, the SALSA RD address error is treated as an
ASIC_FATAL_ERROR. There is no workaround.
•
CSCin01252
A line protocol flap may occur on a router or the router may go down in high traffic conditions. This
symptom is observed on a Cisco 7200 router that is configured with a PA-T3, PA-E3, or PA-H port
adapter, a Network Processing Engine (NPE-400), or a Network Service Engine-1 (NSE-1).
Workaround: Use dual interface versions of the port adapters mentioned above.
•
CSCuk34118
If a line card is online insertion and removal (OIR) out during the line card Cisco Express
Forwarding (CEF) table(s) download, all other line cards may get stuck in the “request-reload state”
waiting for the OIR out line card to finish its download.
Workaround: Reinstall the line card into the OIR out slot.
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
Cisco IOS Release 12.0(21)S2 is a rebuild of Cisco IOS Release 12.0(21)S. All the caveats listed in
this section are resolved in Cisco IOS Release 12.0(21)S2. This section describes only severity 1
and 2 caveats.
•
CSCdu43030
On a Cisco 12000 series Internet router that is configured with an OC-48/SRP line card, when the
OC-48 spatial reuse protocol ring is wrapped, the line card may forward a packet for which the
destination is its own address (that is, the address of the line card) to the failed ring. There is no
workaround.
•
CSCdv28626
ATM virtual circuit (VC) counters are not correctly incremented on a 1-port ATM OC3 multimode
port adapter (PA-A1-OC3MM) that is installed on a Cisco 7500 router that is running Cisco IOS
Release 12.1(7a)E2. There is no workaround.
•
CSCdv46696
Sometime after performing an online insertion and removal (OIR) of a Cisco 7000 series Versatile
Interface Processor (VIP), all distributed Multilink PPP (dMLP) traffic may stop flowing. This
condition may occur several minutes after an OIR or one day after an OIR.
Workaround: Reload the router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2200
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdv70295
If an Engine-4 line card is configured as the ingress point for a Multiprotocol Label Switching
(MPLS) Traffic Engineering (TE) tunnel, on reroute, the line card that is configured as the egress
point may reload. There is no workaround.
•
CSCdv73877
Traffic that is sent from a Multiprotocol Label Switching (MPLS) customer edge (CE) router
(MPLS CE 1) to an MPLS CE router (MPLS CE 3) through two MPLS provider edge (PE) routers
(MPLS PE 1 and MPLS PE 2) and an MPLS core is not accounted for properly with NetFlow on the
incoming interface of the MPLS PE 1 router.
Traffic is accounted for properly with NetFlow when traffic is sent from the MPLS CE 1 router to
an MPLS CE router (MPLS CE 2) that is connected directly to the MPLS CE 1 router without going
through the MPLS core. This condition is observed on a Cisco 3640 router that is running Cisco IOS
Release 12.1(5)T10 or 12.2(5a). This condition occurs only if the incoming interface runs
Cisco Express Forwarding (CEF); it does not occur if the traffic that is arriving on an interface is
configured to perform fast switching using the no ip route-cache cef command. This condition does
not affect the MPLS NetFlow egress functionality.
The condition is seen without VPN routing/forwarding VRF instances and with any traffic that is
coming in through a CEF-enabled interface and needs to be MPLS-encapsulated to go into the
MPLS core. This condition is observed on a Cisco 7500 series router that is running Cisco IOS
Release 12.0.(19)S1 and has distributed Cisco Express Forwarding (dCEF) enabled.
Workaround: Disable CEF.
•
CSCdv83875
On a Cisco 7500 series Versatile Interface Processor 4 (VIP4) that is configured with a PA-2FE port
adapter that has committed access rate (CAR) enabled outbound on both Fast Ethernet interfaces,
after you have reloaded the microcode while the router was forwarding traffic, the router may stop
sending traffic. Entering the shutdown command followed by the no shutdown command solves
the condition only temporarily.
Workaround: Reload the microcode while there is no egress traffic on the router.
•
CSCdv85415
Multiprotocol Label Switching (MPLS) packets that are received on a 802.1q subinterface on a
3-port Gigabit Ethernet line card may be dropped by the Packet Switching ASIC (PSA).
Workaround: Clear Cisco Express Forwarding (CEF) on the affected line card using the clear cef
linecard slot command.
•
CSCdv88102
An rsp-pv Service Provider Feature Set software image that is installed on a Cisco 7500 series
Versatile Interface Processor (VIP) does not include some “x25” commands, such as the show x25
command. There is no workaround.
•
CSCdw04221
When you perform a test loop on a Very Short Reach (VSR) OC-192 line card that is installed in a
Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(19)S, the line card may
reload with an error message that indicates that the program counter is corrupt. There is no
workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2201
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdw08605
On a Cisco 12000 series Internet router that is configured with an Engine Quad OC-48 line card that
is functioning as an ingress line card and that is performing outbound loadsharing with an egress
Engine 2 line card, the loadsharing per source and destination is not performed and only one path is
utilized, which results in one path being overutilized and the other path being underutilized. There
is no workaround.
•
CSCdw11198
A Cisco router may reload when a probe is configured to operate at a frequency of 0 seconds and
then is scheduled to run.
Workaround: The probe frequency of 0 seconds is illegal and must not be used.
•
CSCdw14750
After you have performed an online insertion and removal (OIR) of a Universal Transport Interface
(UTI) Tunnel Server line card and the line card has reloaded, the UTI tunnels do not rebind and a
Layer 2 Tunneling Protocol (L2TP) message that may be misleading will be displayed.
Workaround: Reload microcode onto the UTI Tunnel Server line card.
•
CSCdw20980
If you perform an online insertion and removal (OIR) of a Versatile Interface Processor (VIP) in a
Cisco 7500 series router or use the Single Line Card Reload (SLCR) feature after a VIP has reloaded
unexpectedly, and if there are static routes defined that use the interfaces on the failed VIP, traffic
that is using those static routes may fail. The static routes include those that are defined within a
Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) Routing and Forwarding
(VRF) instance.
Workaround: Enter the clear cef linecard slot-number adjacency command on the affected VIP.
•
CSCdw24749
A Cisco 12000 series Internet router that has multicast enabled and that is configured with an
Engine 4 ingress line card may not perform well.
Workaround: Reload microcode on the Engine 4 line card.
•
CSCdw24995
If a Cisco 12000 series Engine 2 line card forwards traffic with large Multicast Group ID (MGID)
numbers, spurious memory access errors may occur when the multicast routing table is cleared.
There is no workaround.
•
CSCdw27800
A Versatile Interface Processor (VIP) may reload if distributed Multilink PPP (dMLP) is configured
on a channelized T3 or E3 interface after the router is reloaded and booting up. There is no
workaround.
•
CSCdw28501
A NetFlow aggregation scheme may have a cache entry with a “/32” prefix, even though the
minimum mask is not set for this aggregation scheme.
Workaround: Set a value for the minimum mask, such as a value of “/8” or “/16”.
•
CSCdw31637
Misaligned or spurious memory accesses may be detected on a Versatile Interface Processor (VIP)
at the hqf_get_policymap() process. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2202
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdw31709
On a Cisco 12000 series Internet router that is configured with an Engine 2 ingress line card with a
“Rev. @6TBM” application-specific integrated circuit (ASIC), packets that require fragmentation
and whose size is close to the maximum transmission unit (MTU) of the egress link may not be
processed correctly by the ingress line card. There is no workaround.
•
CSCdw36223
A memory leak may occur on a Cisco 12000 series Internet router that is running Cisco IOS
Release 12.0(18)S1 and the “Fabric Ping” process may hold more than 50 MB of memory. There is
no workaround.
•
CSCdw37443
If you remove an E1 or T1 line from a multilink interface, the interface may not report the correct
bandwidth value.
Workaround: Enter the shutdown command followed by the no shutdown command on the
controller under which the removed E1 or T1 line was configured.
•
CSCdw42883
If you apply the tx-cos name command on a 2-port STM-1/OC-3 channelized E-1/T-1 line card that
is configured for Multilink PPP (MLP) and traffic is passing through the line card at line rate, the
Forwarding Information Base (FIB) may become disabled.
Workaround: Reload microcode onto the line card.
•
CSCdw43326
If you enter the shutdown command followed by the no shutdown command on a 2-port
STM-1/OC-3 Channelized E-1/T-1 line card that is configured for Multilink PPP (MLP) and that has
traffic flowing through it, the line card may reload. There is no workaround.
•
CSCdw49266
A Cisco 2600, 7200, 7500, or 12000 series router that is running a Cisco IOS release other than
Cisco IOS Release 12.1 E that contains the fix for CSCdp70087 may experience spurious memory
access. There is no workaround.
•
CSCdw50369
If you add groups quickly and in large numbers while a Cisco 12000 series 10-port 1-Gigabit
Ethernet line card is sending multicast traffic to a large number of groups (like 2000 groups), the
line card may drop multicast packets. For example, if the line card sends 1500-byte packets at
10,000 packets per second (pps), only 8,850 pps may be received.
Workaround: Add groups in smaller increments.
•
CSCdw50936
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(20.4)S1 and that is
configured with an Engine 2 Packet-over-SONET (POS) line card, Sampled NetFlow (SNF), and an
input access control list (ACL), the ACL may leak traffic that is being sampled even though the ACL
is configured to deny the traffic. This situation occurs if you configure SNF before you apply the
input ACL.
Workaround: Enable the ACL on the line card before you apply SNF.
Alternate workaround: If you configured SNF before you applied the input ACL, remove SNF and
reapply it.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2203
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdw51855
Two routers that are running Cisco IOS Release 12.0(18)S may fail to reestablish a Connectionless
Network Service (CLNS) relationship after a Packet-over-SONET (POS) outage has occurred
between them.
Workaround: Enter the clear isis * command on the routers.
•
CSCdw52694
You may not be able to restart or reschedule an active Response Time Reporter (RTR) probe.
Attempts to do so result in the probe being shown with a status of “Unknown” when the show rtr
operation command is executed.
Workaround: Enter the no rtr command and reconfigure the RTR probe. Note that the no rtr
command will disable all of the RTR probes and must be used with utmost caution.
•
CSCdw52740
If you configure VPN routing/forwarding (VRF) instances on the Frame Relay subinterfaces of a
Cisco 12000 series line card and you reload the line card, packets that are received on Frame Relay
VRF instances may be forwarded with incorrect tag values.
Workaround: Disable and enable tag switching for the affected line card in order to renegotiate tags.
•
CSCdw52832
A Cisco router boots the boot image in bootflash instead of booting the full Cisco IOS image from
the disk if all of the following conditions are met:
– The configuration register is set to autoboot.
– There is no configuration in NVRAM or boot system command in the configuration.
– There is a complete and bootable Cisco IOS image on the disk and there is a boot image in the
bootflash.
Workaround: Set the router to boot the image from the disk using the boot system global
configuration command.
•
CSCdw52890
On a Cisco 7500 router that has a Versatile Interface Processor (VIP) and that is running Cisco IOS
Release 12.0(19.6)S, the “VIP will crash with a %SYS-2-WATCHDOG: Process aborted on
watchdog timeout Process = TurboACL” error message may be displayed when compiled access
lists with noncontiguous masks are used. This behavior does not affect compiled access lists that do
not have noncontiguous masks.
Workaround: Turn off compiled access lists using the no access-list compiled global configuration
command.
Alternate workaround: Avoid using entries that have noncontiguous masks or replace such entries
with single or multiple entries with contiguous masks.
•
CSCdw53957
If an Engine 4 or Engine 4 plus line card that is installed in a Cisco 12400 series Internet router that
is running Cisco IOS Release 12.0(21)S receives a large amount of multicast traffic, the line card
may stop responding and be reset by the route processor because of a fabric ping timeout. The stack
trace in the line card reload context may point to the “lc_mbus_interrupt_handler()” function,
whereas the process level traceback may point to the “gen67_tdl_request_hash_search()” function.
There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2204
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdw58731
On an Engine 4 plus Quad OC-48 or OC-192 line card that has an access control list (ACL) and
committed access rate (CAR) configured on an input port, if you configure the ip unreachable or
no ip unreachable command, the line card may reload even though there is no traffic going through
the line card.
Workaround: Configure the ip unreachable or no ip unreachable command before you configure
security features, such as ACLs, on the line card.
•
CSCdw59459
If you attempt to configure the srp count [H.H.H] command, where H.H.H specifies the 48-bit MAC
address for the node that originated the packets that will be counted, you may get the following
notification message:
% This command is an unreleased and unsupported feature.
If you enter the srp ? interface configuration level command on an OC-48-based Dynamic Packet
Transport (DPT) platform, the count command will be hidden. You can still configure the count
command, but the previously stated notification message will show up. There is no workaround.
•
CSCdw62094
An Engine 4 plus line card that is installed in a Cisco 12400 series Internet router that is running
Cisco IOS Release 12.0(21)S may unexpectedly reload when it has to fragment multicast packets
before transmitting them.
Workaround: Use interface maximum transmission unit (MTU) values that are large enough to avoid
packet fragmentation.
•
CSCdw62459
A Cisco 12000 series 6-port DS3, 6-port E3, 12-port DS3, or 12-port E3 line card does not function
as a Universal Transport Interface (UTI). There is no workaround.
•
CSCdw63200
If you reload a 4-port OC-3 line card on a Cisco 12000 series Internet router, a burst of cyclic
redundancy check (CRC) errors may be received at the other end of the OC-3 link. If the remote
router is software based (such as a Cisco 7200 series router), this burst of CRC errors may cause
high CPU utilization.
Workaround: Shut down the interface at the remote router before you reload the 4-port OC-3 line
card.
•
CSCdw63657
Spurious memory accesses are observed at the dsx3_controller_t1_framing process when extended
super frame (ESF) framing is configured on a Channelized T3 Interface Processor (CT3IP)
controller. Spurious memory accesses may also occur if the router is rebooted while framing is set
to ESF. There is no workaround.
•
CSCdw67592
After a Cisco 12000 series Internet router has reloaded, multicast traffic may not go through an
Engine 2 line card if multicast hardware switching is enabled.
Workaround: After the router has reloaded, unconfigure and then reconfigure multicast hardware
switching.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2205
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdw68196
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(20.04)ST2, if you
configure Multilink Frame Relay (MRF) on a 6-port channelized T3 line card or a 2-port
STM-1/OC-3 channelized E-1/T-1 line card and you perform an online insertion and removal (OIR)
of the line card, the MFR interfaces do not recover. There is no workaround.
•
CSCdw70972
On a Cisco 12000 series OC-48 line card, the police, rate-limit, and committed access rate (CAR)
do not work correctly if the average configuration exceeds the OC-12 line rate. There is no
workaround.
•
CSCdw71666
On a Cisco 12000 series Internet router that is configured with a 6-port channelized T3 (6CT3) line
card that has a large number of routes in the network, multilink PPP (MLP) interfaces may appear
in an “up/up” state after the router has reloaded but traffic will not pass over the multilink interfaces.
Workaround: Enter the hw-module slot shelf-id|slot-number reload command on the 6CT3 line
card. This workaround ensures that the Forwarding Information Base (FIB) table on the line card is
updated with the information from the FIB table on the route processor (RP).
Alternate workaround: If there are only a few MLP bundles configured on the 6CT3 line card, enter
the shutdown command followed by the no shutdown command on all serial interfaces in the
multilink bundle on the router that is configured with the 6CT3 line card and on the router at the
receiving end. This workaround ensures that the FIB table on the line card is updated with the
information from the FIB table on the RP of the router that is configured with the 6CT3 line card.
•
CSCdw73961
On a Cisco 7500 series router that is configured with a PA-MC-T1 or PA-MC-E1 port adapter that
is part of a multilink connection that has weighted fair queuing (WFQ) configured, low throughput
may occur after you enter the shutdown command followed by the no shutdown command on the
controller of the port adapter or after you reboot the router.
Workaround: Enter the shutdown command followed by the no shutdown command on the
multilink interface.
•
CSCdw74061
On a channelized IP Services Engine (ISE) line card (also referred to as an Engine 3 line card), if
you add a new channel after the line card has restarted or reloaded and a noncritical transient
hardware error occurs, the from-fabric queue of the interface of the line card may become stuck and
packets cannot be transmitted out of the interface.
Workaround: Restart or reload the line card.
•
CSCdw75717
On a Cisco 12000 series Gigabit Ethernet (GE) line card that has outbound committed access rate
(CAR) configured, pings may fail for packets with a size that exceeds 1530 bytes.
Workaround: Disable CAR on the GE line card.
•
CSCdw79641
A channelized T3 Interface Processor (CT3IP-50) that is installed in a router that is running
Cisco IOS Release 12.0(21)S1 may reload with an error message that is very similar to the
following:
$0
a0
t0
t4
:
:
:
:
00000000,
60A6FEA0,
00008000,
600C8040,
AT
a1
t1
t5
:
:
:
:
30037FE0,
60A07EA0,
4E90424C,
000000F8,
v0
a2
t2
t6
:
:
:
:
00000000,
00000007,
00000001,
00000000,
v1
a3
t3
t7
:
:
:
:
3802F3BE
00000020
601824C8
611F7BAC
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2206
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S2
s0 : 60A07EA0, s1 : 0000000A, s2 : 00000030, s3 : 60A71880
s4 : 00006000, s5 : 60A6FEA0, s6 : 00000033, s7 : 60A49660
t8 : 8E07F138, t9 : 00000000, k0 : 00000000, k1 : 00000004
gp : 606DBFC0, sp : 6086C380, s8 : 00000003, ra : 6017DFB0
EPC : 00000000, ErrorEPC : 800086B8, SREG : 3400E103
Cause 00000008 (Code 0x2): TLB (load or instruction fetch) exception
00:00:41: -Traceback= 0x6017DFB0 0x601805FC 0x601825A4
There is no workaround.
•
CSCdw82373
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)S1 and that is
configured with a 6-port channelized T3 (6CT3-SMB) line card that has Multilink Frame Relay
(MLFR) enabled, MLFR bundle flaps may occur because of degradation on one link in the MLFR
bundle or because of one link in the MLFR bundle being shut. Traffic may no longer be sent over
the link that is shut, but the rest of the links should be able to transmit without interruption. There
is no workaround.
•
CSCdw82466
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(19.3)S or a later release
may reload because of memory corruption during a hardware failure. This situation may cause a
chassis component to identify its slot number incorrectly. There is no workaround.
•
CSCdw84138
A Cisco 12008 router that is running Cisco IOS Release 12.0(21)S1 does not initialize or
periodically update the Switch Fabric Card (SFC) status LEDs, which causes the LEDs to appear to
be nonfunctional. The switching functions of the SFCs are not affected, but the SFCs, as seen from
the front panel, appear to be nonfunctional. There is no workaround.
•
CSCdw85497
Packets with an incorrect IP checksum that are coming into a Cisco 12000 series Engine 4 plus line
card are not getting dropped but are switched out of the router. There is no workaround.
•
CSCdw86488
After a 6-port channelized T3 (6CT3-SMB) line card that is configured for Multi Frame (MFR) and
that is installed in a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)S1
has reloaded, an associated MFR bundle may not recover.
Workaround: Reload microcode onto the line card.
•
CSCdw91171
An erroneous Cisco Express Forwarding (CEF) entry that points to a Gigabit Ethernet interface as
a next hop is created for a route that is not in the routing table. This condition is caused by the
Address Resolution Protocol (ARP) when ARP looks up a request during multicast processing.
Workaround: Disable proxy ARP on the interface and on all routers that are connected to the same
segment using the no ip proxy arp interface configuration command.
•
CSCdw91774
On a Cisco 12000 series Internet router, the switchover to the backup Clock and Scheduler Card
(CSC) may not be generated when loss of signal (LOS) or cyclic redundancy check (CRC) errors
are detected.
Workaround: Replace the CSC that has the hardware failure.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2207
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdw94637
On a line card in a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)ST
with Interface Under Test (IUT) configured as the Border Gateway Protocol (BGP) neighbor link to
the traffic source, if you configure unicast Reverse Path Forwarding (uRPF) strict check on the IUT,
traffic will be blocked for both valid and invalid source addresses.
Workaround: Remove uRPF from all interfaces on the affected line card and then add uRPF again.
•
CSCdx03050
If you configure Per Interface Rate Control (PIRC) on one port of a Cisco 12000 series Engine 2
line card, any packet that has an IP precedence higher than zero, that is directed to the router itself,
and that is arriving at any other port of the same Engine 2 line card will be dropped because of an
“ip.checksum error.”
Workaround: Remove PIRC.
•
CSCdx04074
In a Multiprotocol Label Switching Fast Reroute (MPLS FRR) Traffic Engineering (TE)
configuration that has a one-hop primary TE tunnel with a two-hop FRR backup tunnel, if you use
a Cisco 12000 series Engine 4 line card at the egress side of the Penultimate Hop Popping (PHP) in
the MPLS FRR TE path, traffic forwarding may stop after FRR has started. There is no workaround.
•
CSCdx04487
An enhanced 4-port OC-12 Packet-over-SONET (POS) line card that is installed in a Cisco 12000
series Internet router that is running Cisco IOS Release 12.0(19)S1 may repeatedly report the
following error message:
SLOT 6:Mar 14 09:49:23 MET: %LCPOS-3-SOP: RX:UnexpectedSop. Source=0x4 (Framer),
halt_minor0=0x8000
SLOT 6:Mar 14 09:49:23 MET: %GSR-3-INTPROC: Process Traceback= 400C8E08 400C4730
40010A24
-Traceback= 402EF7E4 40620744 400C3F0C
A SONET synchronization difficulty may precede the error message. The line protocol goes down
on the affected interface and if the affected interface is not shut down, the line card will eventually
be reloaded by the router because of internal ping timeouts and the following error message will
appear:
%GRP-3-COREDUMP: Core dump incident on slot 6, error: Fabric ping failure (seq:502605)
There is no workaround.
•
CSCdx06621
A Cisco router that is running Cisco IOS Release 12.1(13) or another Cisco IOS release may reload
with a bus error that is related to Open Shortest Path First (OSPF). There is no workaround.
•
CSCdx12759
On a Cisco 12000 series Internet router that is configured with a redundant Gigabit Route Processor
(GRP) that is booted with the gsr-p-mz software image of Cisco IOS Release 12.0(21)ST, the
standby GRP may reload after bootup. There is no workaround.
•
CSCdx17893
A Cisco 12000 series Engine 3 line card that is configured with Intermediate
System-to-Intermediate System (IS-IS) or Open Shortest Path First (OSPF) as the Interior Gateway
Protocol (IGP), that has many (10,000) IS-IS or OSPF routes configured, and that has loadbalancing
enabled may reload. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2208
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S2
•
CSCdx20954
A Cisco 12000 series OC-3 line card may reload unexpectedly and then recover. There is no
workaround.
•
CSCdx23088
On a Gigabit Ethernet (GE) interface of a Cisco 12000 series 3-port GE line card, Sampled NetFlow
(SNF) accounting may be inaccurate if you apply an access control list (ACL) to the interface.
Workaround: Do not apply an ACL to the interface.
•
CSCdx24242
If you have unicast Reverse Path Forwarding (uRPF) configured on a Cisco 12000 series Internet
router, packets with a valid source IP address that is reachable via tag switching may not be passed
through. There is no workaround.
•
CSCdx33749
A Cisco 12000 series Internet router may reload if you insert a Clock and Scheduler Card (CSC) in
slot 16 while a program runs and a Simple Network Management Protocol (SNMP) query is
performed using “CISCO-PROCESS-MIB.” There is no workaround.
•
CSCin02000
If you add new interfaces on a line card that is installed in a Cisco 12000 series Internet router, the
Multicast Distributed Fast Switching (MDFS) functions on other line cards of the same router do
not recognize the newly added interfaces until multicast is enabled on the newly added interfaces.
Workaround: Turn on a multicast function, such as the Protocol Independent Multicast (PIM) mode.
•
CSCin02825
On a PA-4T+ or PA-8T port adapter that has non-V3 microcode loaded and that is installed in a Cisco
router that is running Cisco IOS Release 12.0 S, “STARTFAIL/STOPFAIL” messages may occur if
you enter the disable command from the driver while the interface is operating under heavy traffic.
Workaround: Perform an online insertion and removal (OIR) of the port adapter.
•
CSCuk32594
A Cisco 12000 series Internet router may encounter the following error messages on an Engine 2
line card:
00: 22:20: %FIB-3-FIBDISABLE: Fatal error, slot 0: No window message, LC to RP IPC is
non-operational.
This message indicates that Cisco Express Forwarding (CEF) has been disabled on the Engine 2 line
card. This situation occurs under the following circumstances:
– If the router reloads and the Engine 2 line card is the last card to reboot.
– If all Border Gateway Protocol (BGP) neighbors are reachable only through an Engine 2 line
card or if BGP neighbors are reachable through other interfaces but the BGP sessions do not
come up within 6 minutes of the reboot of the Engine 2 line card.
– If the router is running Cisco IOS Release 12.0(21)S1.
In Cisco IOS Release 12.0(21)S1, the behavior of CEF was modified in such a way that no single
line card enables CEF until all line cards are rebooted. In addition, if a line card requests a CEF
reload while BGP is in the process of using system resources aggressively, this reload is suspended
until BGP signals that it is safe to do so. These modifications were made to prevent CEF and BGP
from contending for system resources at the same time (see CSCdw54825 for details).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2209
Resolved Caveats—Cisco IOS Release 12.0(21)S1
In the situation described in this DDTS, some or all Engine 2 line cards actually request a second
CEF reload just after CEF is enabled. When this second request occurs, the line card is placed in a
waiting state until BGP signals to proceed with the reload (as documented in CSCdw54825);
however, BGP does not give that signal until a peer comes up, or until 6 minutes have passed
(whichever comes first).
While the line card is in this waiting state, the route processor (RP) ignores its CEF keepalives. After
6 minutes (a predefined timer), if the line card is still in the waiting state, the RP disables CEF on
this line card because the RP does not register any keepalives.
Workaround: Configure the nonenhanced BGP convergence mode by entering the bgp
normal-mode command. You can enter this command under the “bgp router <x> section” of the
configuration file. Note that this command is available only in Cisco IOS Release 12.0(21)S1.
The fix for this DDTS serves two purposes:
– The RP no longer ignores keepalives from line cards that are waiting for a CEF reload.
– The BGP timer that waits for the first peer to come up has been decreased from 6 minutes to
2.5 minutes.
Resolved Caveats—Cisco IOS Release 12.0(21)S1
Cisco IOS Release 12.0(21)S1 is a rebuild of Cisco IOS Release 12.0(21)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(21)S1. This section describes only severity 1 and 2
caveats.
•
CSCdv04951
A Cisco 7200 series router may reload when it is passing heavy traffic of large packets through a
PA-A1 port adapter. The reload does not occur under normal traffic conditions.
Possible workaround: Reduce the maximum transmission unit (MTU) size of the ATM interface so
that the interface never has to pass a packet of more than 4500 bytes.
•
CSCdv14760
On a Cisco 12000 series Internet router, the configuration of the ip route-cache cef command on
the Ethernet 0 interface results in the following error message:
%CEF not supported for ARPA
Cisco Express Forwarding (CEF) cannot be enabled on the Ethernet 0 interface.
Note
•
The Gigabit Route Processor (GRP) Ethernet port is designed for use as a management
interface only. Cisco does not support either the use of Ethernet 0 as a traffic-switching port
or the enabling of CEF on this port. Cisco will likely disable the ip route-cache cef for
Ethernet 0 in future Cisco IOS releases. Cisco encourages customers to migrate from
Ethernet 0 switching configurations. Ethernet line cards are available for the Cisco 12000
series Internet router for customers who require Ethernet interfaces.
CSCdv42325
On a Cisco 12000 series Internet router, switching from load balancing to a fast adjacency or from
a fast adjacency to load balancing may result in traffic loss. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2210
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S1
•
CSCdv90792
A 3-port Gigabit Ethernet line card that is installed in a Cisco 12000 series Internet router that is
running Cisco IOS Release 12.0(16)S or higher 12.0(16)S releases may reload intermittently with
“PSAERRSS” errors and bus errors under the following conditions:
a. At least five output access control lists (ACLs) are configured on the router (the sixth output
ACL is being handled by the CPU of the line card).
b. Ingress traffic that is destined for egress on the local line card is matching access control entries
(ACEs) that are being executed on the ingress CPU.
c. A large volume of Border Gateway Protocol (BGP) routes are present.
d. The above-mentioned traffic scenario occurs during periods of heavy changes in the Forwarding
Information Base (FIB).
“FIB-4-RADIX” insert messages may be displayed before the line card reloads.
This issue is resolved in Cisco IOS Release 12.0(16)S7 and higher releases. There is no workaround
for the affected releases.
•
CSCdw10748
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(15)S to 12.0(19)S may
not correctly switch over to the backup Clock Scheduler Card (CSC) in the event of a CSC card
failure because of “grant parity” or “request parity” errors. If such an error occurs the following
message may be seen in the output of the show log command:
Sep 22 03:00:56.674 JST: %FABRIC-3-PARITYERR: To Fabric parity error was detected.
Grant parity error Data = 0x2.
SLOT 1:Sep 22 03:00:56.674 JST: %FABRIC-3-PARITYERR: To Fabric parity error was
detected. Grant parity error Data = 0x1
The output of the show controller fia command may look as follows:
Fabric configuration: Full bandwidth redundant
Master Scheduler: Slot 16
From Fabric FIA Errors
----------------------redund fifo parity 0
redund overflow 0
cell drops 116
crc32 lkup parity
cell parity
crc32
0
0
Switch cards present
0x001F
Slots
16 17 18 19 20
Switch cards monitored
0x001F
Slots
16 17 18 19 20
Slot:
16
17
18
19
20
Name:
csc0
csc1
sfc0
sfc1
sfc2
--------
--------
los
0
1
state
Off
Off
crc16
1167
402
--------
--------
--------
0
0
0
Off
Off
Off
1167
1167
0
1167
To Fabric FIA Errors
----------------------sca not pres 0
req error
xx
uni fifo overflow 0
grant parity xx
multi req
0
uni fifo undrflow 0
cntrl parity 0
uni req
0
crc32 lkup parity 0
multi fifo
empty dst req 0
0
handshake error
0
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2211
Resolved Caveats—Cisco IOS Release 12.0(21)S1
cell parity
0
There is no workaround.
•
CSCdw17012
On a Cisco 12000 series Internet router that is configured with an Engine 4 line card that had 256
MB of CPU memory, the show processes memory command may show more than 4 GB of used
memory. When the counter reaches 4.2 GB, it may reset to 0, which causes the line card to think it
has run out of memory and to disable Cisco Express Forwarding (CEF). Issuing the clear cef
linecard [slot-number] command will bring the line card back up. But there is no workaround for
the memory problem or to prevent the counter from resetting to 0.
•
CSCdw24515
The line card on a Cisco router may reload when the same access control list (ACL) is applied to
two or more main interfaces and then any ACL is applied to a subinterface on one or more of the
same main interfaces. There is no workaround.
•
CSCdw30178
A Cisco router that is running Cisco IOS Release 12.0(20.3)S1 may not be accessible through the
Ethernet 0 interface.
Workaround: Load the software onto the router, copy the running configuration file to the startup
configuration, and reload the router.
•
CSCdw47388
If you configure an output access control list (ACL) with 448 lines on a Cisco 12000 series Internet
router and the ingress line card for the traffic that needs to be filtered is an 8-port or 16-port OC-3
Packet-over-SONET (POS) line card, the output ACL will not filter traffic.
Workaround: Do not configure an ACL with more than 128 lines on any interface of a Cisco 12000
series Internet router that is configured with an 8-port or 16-port OC-3 POS line card.
•
CSCdw54825
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)S may experience
memory allocation failures in Border Gateway Protocol (BGP) if the following conditions exist:
– The router is using peer groups for BGP neighbors.
– The line cards are still booting after BGP has started to converge.
The problem stems from BGP and Cisco Express Forwarding (CEF) ineffectively sharing free
memory during a reload.
Workaround: Ensure that all line cards have booted before BGP has begun convergence. This can be
achieved several ways:
– Increase the update-delay time to the maximum boot time of a line card. This action reduces the
churn and enables BGP and CEF to share the free memory without overrunning the box:
router bgp autonomous system
bgp update-delay seconds
– Ensure that the line cards have fabric downloaders and ROM monitors that are fully upgraded.
This way, when the router reloads, the line cards will have booted before BGP starts to converge.
– While the line cards are booting, shut down all BGP neighbors:
router bgp autonomous system
neighbor ip-address peer-group peer-group-name
shutdown
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2212
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S1
and then after the line cards have booted, bring those neighbors back up:
no neighbor ip-address peer-group peer-group-name
shutdown
In addition, it is advised to increase the line card memory buffer size. This command enables
CEF to free memory on the Route Processor (RP) at a faster rate. (See CSCds89515 for details.)
ip cef linecard ipc memory 10000
This ddts will be used to implement a generic mechanism that allows BGP to respond to low
memory conditions by slowing down. A related DDTS (CSCdw60365) also addresses this
problem by making the bgp update-delay 360 command the default.
•
CSCdw59362
When a Route Processor (RP) Ethernet port (int e0) is enabled for traffic switching, packets coming
in from a Cisco 12000 series Internet router OC-192/Quad OC-48 card and switched out to interface
e0 would make the RP generate “GRP-4-NO_INTF” error messages.
•
CSCdw63027
When Cisco Express Forwarding (CEF) does a full reload of the Forwarding Information Base (FIB)
table of a line card, CEF can use a lot of memory queuing up the data on the route processor (RP).
Under low memory conditions, this condition can cause Cisco IOS to run out of memory.
Workaround: Configure the ip cef linecard ipc memory 10000 command (if all the line cards have
256 MB or greater memory) or ip cef linecard ipc memory 5000 command (if one linecard has less
than 256 MB memory). These commands increase the amount of storage that the line cards reserve
to handle data from the RP, which reduces the queueing required on the RP.
•
CSCdw65903
An error can occur with management protocol processing. Please use the following URL for further
information:
http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdw65903
•
CSCdw60365
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)S may experience
memory allocation failures during initialization under the following conditions:
– A large BGP routing table exists with peer groups configured.
– Many line cards are present.
– The router is not configured to synchronize BGP startup with the line card initialization.
The BGP performance enhancements that were introduced in Cisco IOS Release 12.0(19)S
significantly decrease routing convergence time by improving the efficiency of communication
between BGP neighbors. These enhancements aggressively use available router resources to achieve
optimal convergence. BGP must therefore be synchronized with other processes to prevent
contention for critical resources such as memory and CPU cycles. On the Cisco 12000 series Internet
router platform, this requirement is even more critical because of the amount of memory needed to
distribute forwarding tables to the line cards. The Cisco 12000 series Internet router switching fabric
infrastructure enhancements that were introduced in Cisco IOS Release 12.0(21)S require a
one-time update of internal structures that are stored on the line cards. This update will require
approximately 30 seconds per line card of additional boot time during the first upgrade Cisco IOS
Release 12.0(21)S or later. The line cards will not be able to process forwarding table updates
generated by BGP and Cisco Express Forwarding (CEF) during the software upgrade. The
combination of increased memory usage by BGP and the need to buffer additional CEF updates
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2213
Resolved Caveats—Cisco IOS Release 12.0(21)S
while the line cards are upgrading may cause a router to run out of memory after loading Cisco IOS
Release 12.0(21)S for the first time. This condition affects only a Cisco 12000 series Internet router
that is running Cisco IOS Release 12.0(21)S.
Workaround: Manually configure the process synchronization bgp update-delay 360 router
configuration command. This command will prevent BGP from advertising or installing routes until
the line cards are fully initialized. This configuration is recommended for all routers to ensure
optimal convergence and is now required for a Cisco 12000 series Internet router with a large routing
table that is running Cisco IOS Release 12.0(21)S.
•
CSCdw63039
During low memory conditions, it is possible for the peer-group leader to not receive all routes.
There is no workaround, but the clear ip bgp ip-address soft out command can be used to force
Border Gateway Protocol (BGP) to resend updates to the peer specified in the ip-address argument.
•
CSCdw65903
An error can occur with management protocol processing. Please use the following URL for further
information:
http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdw65903
•
CSCuk30224
On platforms that support distributed Cisco Express Forwarding (dCEF), when CEF reloads the
forwarding table on a line card, either at boot time or after an online insertion and removal (OIR)
event, the Forwarding Information Base (FIB) of the line card may be missing one or more prefixes.
Workaround: Enter the clear cef linecard slot on the affected line card.
•
CSCuk31851
On a Cisco 12000 series Internet router with downrev fabric downloaders and a lot of line cards, the
Cisco IOS image on line cards in higher slots can take a long time to start running. On the Route
Processor (RP), Cisco Express Forwarding (CEF) starts a keepalive timer for each line card when it
initializes. After 6 minutes, CEF will disable line cards not yet booted with the following message:
%FIB-3-FIBDISABLE: Fatal error, slot 8: No window message,
LC to RP IPC is non-operational
Workaround: Upgrade the fabric downloader. If the problem occurs, it can be cleared by using the
clear cef linecard slot command for the affected slots.
Resolved Caveats—Cisco IOS Release 12.0(21)S
All the caveats listed in this section are resolved in Cisco IOS Release 12.0(21)S. This section describes
only severity 1, severity 2, and select severity 3 caveats.
Basic System Services
•
CSCdr89245
Depending on the platform, if you use the operation ID of 2147483647 for Service Assurance Agent
(SAA) operation and use the show running-config, show rtr operational-state, or show rtr
collection-statistics EXEC commands, the platform could reload or pause indefinitely.
Workaround: Do not use 2147483647 for an SAA operation.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2214
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCds30298
The following sequence of commands causes a Cisco router to reload:
a. The configure [terminal] privileged EXEC command
b. The rtr 2147483647 command,
c. The rtr schedule [start-time {now}] global configuration command
d. The rt reset global configuration command
Workaround: Avoid using entry number 2147483647 in the rtr 2147483647 command. The router
reloads only when you use entry number 2147483647. Any other available number may be used.
•
CSCds53023
If the snmp-server community global configuration command is not configured, a Cisco router
does not respond to the snmpwalk command. When you add the snmp-server community
command to the configuration, the router responds to the snmpwalk command. When you remove
the snmp-server community command from the running configuration, the router still responds to
the snmpwalk command. If you restart the router, the router no longer responds to the snmpwalk
command. There is no workaround.
•
CSCdt23572
Round-Trip Time (RTT) measurement may be incorrect if the measurement cycle begins just before
00:00:00 Coordinated Universal Time (UTC) time. This situation applies to all probe types. There
is no workaround.
•
CSCdt81722
A Cisco 7500 series router that is running Cisco IOS Release 12.1(7) and that is configured for
Frame Relay switching over an IP generic routing encapsulation (GRE) tunnel passes data only in
one direction. This situation occurs when a multichannel T1 card (for example, an eight-port
multichannel T1 port adapter (PA-MC-8T1) or a PA-MC-4T1 port adapter) is installed in a Versatile
Interface Processor (VIP) and the serial interface associated with the T1 controller port is configured
to route an incoming data-link connection identifier (DLCI) to a tunnel interface. The permanent
virtual circuits appear active, but IP fails across the tunnel.
Workaround: Use a Fast Serial Interface Processor (FSIP) with an external CSU instead of the
PA-MC-8T1 or PA-MC-4T1 port adapter.
•
CSCdv78855
Under certain conditions, public buffer pools on a Cisco router are not grown dynamically.
Workaround: To create the buffers statically, use the buffers verybig permanent number global
configuration command.
•
CSCdv89415
The rtr reaction-configuration command can be used to trigger another probe when a timeout, a
threshold violation, or a verify error occurs. However, the probe to be triggered gets activated only
once during the first occurrence of the reaction condition. If the reaction condition occurs again (for
example, when the timeout condition clears) and the triggered probe is in the pending state, the
probe should get activated again.
Workaround: This condition is resolved in Cisco IOS Release 12.0(21)S.
•
CSCdw02017
An EVENT-MIB set action may not work correctly. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2215
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdw09442
The boot flash memory of a Cisco MGX 8850 Route Processor Module (RPM-PR) may be corrupt,
an invalid file header magic number may be generated, and the dir command may not work.
Although you can read the Flash memory after a “squeeze boot flash” operation, you cannot copy
anything onto the Flash memory.
Workaround: Format and copy files from the disk to recover the Flash memory.
•
CSCdw17012
On a Cisco 12000 series Internet router that is configured with an Engine 4 line card with 256 MB
of CPU memory, the show processes memory command may show more than 4 GB of used
memory. When the counter reaches 4.2 GB, it may reset to 0, which causes the line card to think it
has run out of memory and to disable Cisco Express Forwarding (CEF). Issuing the clear cef
linecard [slot-number] command will bring the line card back up, but there is no workaround for
the memory problem or to prevent the counter from resetting to 0.
•
CSCdw17162
If you add new line-card interfaces on a Cisco 12000 series Internet router, the Multicast Distributed
Fast Switching (MDFS) functions on other line cards of the same router do not recognize the newly
added interfaces until multicast is enabled on the newly added interfaces.
Workaround: Turn on a multicast function, such as the Protocol Independent Multicast (PIM) mode.
•
CSCdw30178
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)S may not be
accessible through Ethernet interface 0.
Workaround: Load the software image onto the router and then copy the running configurations to
the startup configuration and reload the router.
•
CSCdw39619
On a Cisco 12000 series Internet router, the aggregate NetFlow cache may report a source mask even
when the source address is not routable. The source prefix may show an incorrect mask in the
aggregation cache and display a corresponding incorrect prefix. This condition occurs because of an
inconsistency in the Cisco Express Forwarding (CEF) wrt default routes for the line cards and route
processor. There is no workaround.
Interfaces and Bridging
•
CSCdk27330
A Versatile Interface Processor (VIP) may reload if the following command sequence is applied to
the controller on a Channelized T3 Interface Processor (CT3IP):
t1 external 3 linecode b8zs cablelength 100 no t1 3 timeslots 1-24 no t1 3 clock source line
All commands that are entered after the no t1 3 timeslots 1-24 command may cause the VIP to
reload.
Workaround: To prevent the controller from reloading, enter the commands in the following order:
no t1 3 clock source line t1 external 3 linecode b8zs cablelength 100 no t1 3 timeslots 1-24
or
no t1 3 clock source line no t1 3 timeslots 1-24 t1 external 3 linecode b8zs cablelength 100
Be certain to enter the no t1 3 timeslots 1-24 command after the no t1 3 clock source line command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2216
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdu71723
A Cisco router that is running Cisco IOS Release 12.1(6) may produce the following traceback
messages:
%ALIGN-3-SPURIOUS Spurious memory access made at 0x603DE76C reading 0x78
%ALIGN-3-TRACE -Traceback= 603DE76C 6058CA04 6058C6D8 6058BF2C 607CAC8C 607CE4A0
607C03F4 607C94DC
There is no workaround.
•
CSCdv04951
A Cisco 7200 series router may reload when it is passing a heavy traffic of large packets through a
PA-A1 port adapter. The reload does not occur under normal traffic conditions.
Possible workaround: Reduce the maximum transmission unit (MTU) size of the ATM interface so
that the interface never has to pass a packet of more than 4500 bytes.
•
CSCdv37998
A Cisco 7500 series router that is running Cisco IOS Release 12.0(16)S1 with a channelized T3
(CT3) single wide port adapter on a Versatile Interface Processor (VIP) may experience a flapping
of the interfaces that are created on the CT3 controller.
Workaround: Reload the VIP.
•
CSCdv48962
When a Fast Ethernet (FE) interface is configured for a keepalive value other than the default of
10 seconds, this new value remains in the startup configuration and in the running configuration
until you enter the shutdown command followed by the no shutdown command on the FE interface.
After you have entered these commands, the keepalive value in the running configuration goes back
to the default value of 10 seconds. However, the new value remains in the startup configuration.
There is no workaround.
•
CSCdv51548
A multichannel T3 port adapter (PA-MC-2T3+) that is operating in the clear-channel mode does not
send an alarm indication signal (AIS) after it is administratively shut down. There is no workaround.
•
CSCdv76946
If you first configure dot1Q encapsulation on a Fast-Ethernet subinterface and then change the
encapsulation to Inter-Switch Link (ISL), the router may reload when you try to send a ping
message. There is no workaround.
IP Routing Protocols
•
CSCdv30330
Cisco routers that are configured for Multicast Source Discovery Protocol (MSDP) may experience
frequent MSDP session resets with the MSDP peers of the router. This situation is often caused by
excessive source, group (S, G) information that should be contained in a domain that is being passed
to the outside.
Workarounds:
– Determine if the routers have the Source-Active (SA) filters configured properly by reviewing
the “MSDP SA filter recommendations” posted at
ftp://ftpeng.cisco.com/ipmulticast/config-notes/msdp-sa-filter.txt.
– Determine if the router is running a Cisco IOS image that has the fix for CSCdr93446 (MSDP:
Reducing SA storms and session resets [MSDP rearchitect]).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2217
Resolved Caveats—Cisco IOS Release 12.0(21)S
– Review the output of the show ip msdp sa-cache EXEC command to see if some of the SAs
can be filtered based on the source address, the RP address, or the AS number.
•
CSCdv44531
A Cisco 12000 series Internet router may reload because of a software error and display interprocess
communication (IPC) and watchdog timeout messages. There is no workaround.
•
CSCdv47188
If the first entry in the Multicast Border Gateway Protocol (MBGP) routing table is supernet of the
destination IP address or the MBGP route exists but does not have the best path, Reverse Path
Forwarding (RPF) lookup will fail or return a unicast Border Gateway Protocol (BGP) route if a
unicast BGP route exists.
Workaround: Remove the first entry or add a dummy route that is smaller than the first entry. In case
of a MBGP route without a best path, change the network configuration to ensure that the specified
destination address has the best path.
•
CSCdv63992
If you specify a group list in the ip pim rp-candidate command, the command does not get
“nvgened” correctly. The group list is not “nvgened.” There is no workaround.
•
CSCdv65521
When there is a neighbor change on a Cisco 12000 series Internet router that is running Cisco IOS
Release 12.0(17)S, routes may be deleted and reinstalled for no apparent reason. There is no
workaround.
•
CSCdv74675
If a Border Gateway Protocol (BGP) peer-group is configured for unicast and multicast routes,
multicast-routing information may be advertised to a peer-group member that did not negotiate to
receive IPv4 multicast routes, causing this member to send a notification that a required attribute is
missing.
Workaround: Upgrade the peer-group member that is sending the notification that a required
attribute is missing to the same software as the router that is sending the multicast-routing
information.
First alternative workaround: Configure the router that is sending the notification that a required
attribute is missing to negotiate for IPv4 multicast routes.
Second alternative workaround: Configure the router that is sending the multicast-routing
information in such a way that the peer-group members that are accepting only unicast routes are in
one peer-group and the peer-group members that are accepting both unicast and multicast routes are
in another peer-group.
•
CSCdv81127
On a Cisco 12000 series Internet router, a Traffic Engineering (TE) tunnel may not come up after
the line card reloads on the TE tunnel headend.
Workaround: Enter the shutdown command followed by the no shutdown command on the line
card that functions as the outgoing interface for the TE tunnel headend.
•
CSCdw11274
If a Cisco router receives a gratuitous Address Resolution Protocol (ARP) for a static ARP entry
with an alias keyword, the router may reload because of a bus error.
Workaround: Do not use an alias keyword on a static ARP entry. An alias keyword allows the router
to answer ARP requests for the static ARP entry, but in many cases an alias keyword is not required
because the router needs the static ARP entry only for its own use.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2218
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdw15323
If you have enabled the Resource Reservation Protocol (RSVP) on a Cisco router using the ip rsvp
bandwidth command and the router has at least one RSVP session going, entering the show ip rsvp
reservation command returns an interface name that is clipped to only five digits. There is no
workaround.
•
CSCdw36746
A Cisco 12000 series Internet router that is configured with Open Shortest Path First (OSPF) may
reload because of a bus error at an invalid address. There is no workaround.
•
CSCdw17989
Inconsistent, unpredictable behavior may manifest when Protocol Independent Multicast dense
mode (PIM-DM) is used on a point-to-point interface. There is no workaround.
ISO CLNS
•
CSCdw27973
If you configure Intermediate System-to-Intermediate System (IS-IS) mesh groups under an
interface without correctly configuring the IS-IS process in the global configuration, a Cisco 12000
series Engine 4 line card may reload.
Workaround: Correctly configure the IS-IS process using the router isis global configuration
command.
•
CSCdw31942
When a Cisco 12000 series line card is reloaded with microcode, the Intermediate
System-to-Intermediate System (IS-IS) interface configuration may be lost.
Workaround: Manually reconfigure the interface configuration.
Miscellaneous
•
CSCdm00113
After an online insertion and removal (OIR) of an ATM-CES-OC3 interface that is installed in a
Cisco 7200 series router, all running-configuration parameters are retained except for the
parameters of the atm max-channels command. There is no workaround.
•
CSCdr92924
If three Cisco 12000 series Internet router that are using Frame Relay encapsulation connect to each
other, and the middle router is configured with access lists, pings between the routers fail. There is
no workaround.
•
CSCds21112
A route will be suppressed only if an update is received while the penalty value is above the
suppression limit. This condition will cause the software to flag a route as suppressed when the
withdraw that causes the penalty to go above the suppress limit is received. There is no workaround.
•
CSCds28731
When a member link is shut down in a distributed Multilink PPP (dMLP) bundle, the Multilink
interface may flap. The following sample syslog output is displayed when this condition occurs:
%SYS-5-CONFIG_I: Configured from console by console %LINK-5-CHANGED: Interface
Serial0/0/0:0, changed state to administratively down %LINK-3-UPDOWN: Interface
Multilink1, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2219
Resolved Caveats—Cisco IOS Release 12.0(21)S
Serial0/0/0:0, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface
Serial0/0/1:0, changed state to down %LINEPROTO-5-UPDOWN: Line protocol on Interface
Multilink1, changed state to down %LINK-3-UPDOWN: Interface Multilink1, changed state
to up %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0/1:0, changed state to
up %LINEPROTO-5-UPDOWN: Line protocol on Interface Multilink1, changed state to up
There is no workaround.
•
CSCds30121
A Cisco 12000 series Internet router with approximately 100 switched virtual circuits (SVCs) may
stop sending data randomly across any SVC. This situation is accompanied by “encapsulation
error2” failure messages.
Workaround: Remove the SVC from the map group and add it back again.
•
CSCds76314
A permanent virtual connection (PVC) may go from active status to inactive status and display
“%ATMCES-1-ERRCREATEVC” error messages if the following actions occur:
– The following sequence of commands is entered on a subinterface:
(config-subif)#
shut
shutdown
(config-subif)# no shut
(config-subif)# no shutdown
(config-subif)#
– PVC configuration mode is entered and then exited by entering the end command.
Workaround: Reconfigure the PVC or reload the router.
•
CSCds82662
On a Cisco 7200 series I/O controller card with a Fast Ethernet (FE) interface (RJ-45) that is
configured with Protocol Independent Multicast (PIM) and full duplex, the line protocol flaps when
the cable is removed or fails instead of just going to line protocol down.
Workaround: Remove either PIM or full duplex from the interface.
•
CSCdu05363
Selective packet discard (SPD) does not function on Gigabit Ethernet line cards (Engine 1 and
Engine 2) and Fast Ethernet line cards that are installed in a Cisco 12000 series Internet router.
Workaround: Increase the input hold queue to store the excess packets.
•
CSCdu53023
The IfTable is not updated with the ATM information layer when a new ATM card is inserted.
Workaround: Reload the router.
•
CSCdu60369
The logging synchronous line configuration command may cause logging to stop.
Workaround: Remove this command.
•
CSCdu67066
The Layer 2 (L2) status may suddenly change to TEL_ASSIGNED on a multichannel DS1/PRI port
adapter (PA-MC-4T1). This condition cannot be corrected by entering the shutdown command
followed by the no shutdown command.
Workaround: Reload the router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2220
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdu72587
Multiprotocol Label Switching (MPLS) and tag switching do not function properly between
Multilink PPP interfaces on Cisco 7500/RSP series routers if distributed Cisco Express Forwarding
(dCEF) switching is enabled on interfaces participating in tag switching.
Workaround: Do not enable dCEF globally, or disable dCEF on interfaces that are configured for tag
switching by entering the no ip route-cache distributed interface configuration command.
•
CSCdv01350
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0 S may see Internet
Group Management Protocol (IGMP) mtrace response packets (protocol=2, IGMP type=0x1E) stay
in an interface input hold queue indefinitely. These packets may eventually fill up the interface input
hold queue and cause packet drops.
Workaround: Reload the router to clear the packets from the input hold queue, and increase the input
hold queue depth using the hold-queue queue-length interface configuration command.
•
CSCdv14760
On a Cisco 12000 series Internet router, the configuration of the ip route-cache cef command on
the Ethernet 0 interface results in the following error message:
%CEF not supported for ARPA
CEF cannot be enabled on the Ethernet 0 interface.
Note
•
The GRP Ethernet port is designed for use as a management interface only. Cisco does not
support the use of Ethernet 0 as a traffic-switching port nor the enabling of CEF on this port.
Cisco will likely disable the ip route-cache cef for Ethernet 0 in future Cisco IOS releases.
Cisco encourages customers to migrate from Ethernet 0 switching configurations. Ethernet line
cards are available for the Cisco 12000 series Internet router for customers who require Ethernet
interfaces.
CSCdv19356
On Cisco 12000 series Internet routers, output packet and byte counters are sometimes reported too
high on Channelized T3 and DS3 line cards when the ingress rate is higher than the egress rate (for
example, OC-3 or OC-12 in and T3 or lower out). In this situation, packets are dropped. There is no
workaround.
•
CSCdv19845
On a Cisco router that is running Cisco IOS Release 12.0(15)S5, the Router Processor may become
overloaded if IP multicast routing is enabled but Multicast Distributed Fast Switching (MDFS) is
not enabled on the interfaces.
Workaround:
Make MDFS the default for IP multicast switching.
•
CSCdv25238
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(19)S, the router may
not forward Multiprotocol Label Switching (MPLS)-encapsulated TCP packets correctly when it
has to POP the outer label. This situation also affects User Datagram Protocol (UDP)/Internet
Control Message Protocol (ICMP)-based traffic when the packet size equals 1500 bytes. A symptom
of this condition is giant frame counter increments on the interface. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2221
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdv40918
When the tag-switching ip configuration is disabled globally, the Tag Distribution Protocol (TDP)
or a Label Distribution Protocol (LDP) will not be torn on a label-controlled ATM (LC-ATM)
interface even if the interface is not being used by any other application. The Tag Forwarding
Information Base (TFIB) is properly maintained in spite of this condition. This condition does not
occur if non-ATM interfaces are used. There is no workaround.
•
CSCdv43373
A Gigabit Ethernet interface on a Cisco 7500 series router may experience interprocess
communication (IPC) memory buffer problems after the output becomes stuck and may display the
following message:
%RSP-3-RESTART: interface GigabitEthernet0/0/0, not transmitting Output Stuck on
GigabitEthernet0/0/0
Workaround: Avoid using autonegotiation.
•
CSCdv43870
When you configure a Cisco 12000 series Internet router for load sharing over equal-cost paths with
Multiprotocol Label Switching (MPLS) or tag switching, traffic may be dropped. There is no
workaround.
•
CSCdv44349
If you send Connectionless Network Service (CNLS) traffic through an ATM Permanent Virtual
Circuit (PVC) on a Cisco 7500 series router, a spurious memory access occurs at location
hqf_vip_decode_encaps. There is no workaround.
•
CSCdv48810
On a Cisco 12000 series Internet routers that is running Cisco IOS Release 12.0(19)S, the Unicast
Reverse Path Forwarding (uRPF) feature on Packet-over-SONET (POS)-based Engine 2 line cards
yields low performance rates. This occurs for both basic uRPF and extended uRPF. There is no
workaround.
•
CSCdv52657
On a Cisco router with an interface or subinterface that is configured with “new style” switched
virtual circuits (SVCs) that serve as network service-access points (NSAPs), when you select a SVC
for deletion, only the last-configured SVC may get deleted instead of the SVC that was selected for
deletion. There is no workaround.
•
CSCdv54509
Bringing up an X.75 call on an E1/PRI interface may cause a “SYS-3-INVMEMINT” error message
that indicates that there is a memory action (malloc) at the interrupt level. There is no workaround.
This error message does not impact the user.
•
CSCdv56910
All multicast traffic slows down when Protocol Independent Multicast (PIM) is disabled on one
egress. This condition occurs because all multicast packets are punted to the Route Processor (RP)
after the PIM is disabled on one egress card. There is no workaround.
•
CSCdv60987
A Cisco router may reload when the show flash all EXEC command is entered. (This condition is
noticeable only on low end systems that support multiple banksizes for internal flash.)
Workaround: Replace multiple banksize flash with uniform banksize flash.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2222
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdv61178
On a Cisco 7500 series router that is running Cisco IOS Release 12.0(19)S, a VIP4-80 with an
OC-12 ATM multimode port adaptor reloads when an ATM subinterface is configured with ATM
adaptation layer 5 (AAL5) Subnetwork Access Protocol (SNAP) bridge encapsulation and the
following input and output rate limits:
rate-limit i 10k 5k 5k co tr ex dr
rate-limit o 10k 5k 5k co tr ex dr
There is no workaround.
•
CSCdv62988
If a Cisco 12000 series egress line card is configured with ports that have different bandwidth, the
ToFab queues on an Engine 3 line card may not be serviced fairly by Modified Deficit Round Robin
(MDRR). There is no workaround.
•
CSCdv63849
On a Cisco 12000 series Internet router that is functioning in a Multiprotocol Border Gateway
Protocol (MBGP) and Multiprotocol Label Switching (MPLS) environment, a Gigabit Ethernet
(GE) line card that is configured with an async interface and the ip multicast-routing distributed
and ip mroute-cache distributed commands does not transmit multicast traffic from slot 0.
Workaround: Enter the shutdown command followed by the no shutdown command.
First alternative workaround: Remove the configuration of the async interface.
Second alternative workaround: Enter the no ip mroute-cache command on the GE line card.
•
CSCdv64966
If you enable Turbo access control lists (Turbo ACLs) on a Cisco 12000 series line card and an ACL
is applied to the interface that is running traffic, disabling and then reenabling Turbo ACLs will
cause the line card to reload.
Workaround: Remove the ACL from the interface, recompile the Turbo ACLs, and reapply the ACL
to the interface.
•
CSCdv66909
On a Cisco 12000 series Internet router that is configured with a 1-port or a 3-port Gigabit Ethernet
line card, packets that are destined for a VLAN subinterface that has been configured as
administratively down may still be forwarded through the router. There is no workaround.
•
CSCdv67719
Output distributed committed access rate (DCAR) on a subinterface does not work in distributed
Cisco Express Forwarding (dCEF) mode for packets that are coming in from the same Versatile
Interface Processor (VIP).
Workaround: Use the police feature provided by the service policy.
•
CSCdv68765
If an Advanced Technology Attachment (ATA) disk is inserted into a different slot after a router has
booted up, the Inode numbers of the files in the Inode table may be displayed incorrectly. This
condition may not occur if the disk is removed and reinserted to the same slot. There is no
workaround.
•
CSCdv69195
A Cisco 12000 series 4-port OC48/POS line card that is used as an ingress interface reloads when
egress traffic contains tagged packets that have to be fragmented. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2223
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdv70344
The “Per-Second-Jobs” process on a Cisco 12000 series Internet router may randomly use too much
memory and cause the router to stop functioning. There is no workaround.
Note
•
A “Per-Second Job” is part of a process that is visible if you enter the show proc cpu
command.
CSCdv70626
A “TUG-3” channel may start up in an invalid state, which causes a “TUG-3:DS-3/E3” channel to
remain in a “down/down” state. There is no workaround.
•
CSCdv71868
Tagswitching may not function after it has been enabled. There is no workaround.
•
CSCdv73253
A DS-3 channel that is reprovisioned to a “TUG-3:DS-3/E3” channel may remain in a down state,
even though no SONET alarms are reported. There is no workaround.
•
CSCdv77168
If an access control list (ACL) with 128 or 448 lines is configured on a Cisco 12000 series Engine
2 line card, traffic may match a wrong line of the ACL.
Workaround for an ACL with 128 lines: Use an ACL with less than 96 lines.
Workaround for an ACL with 448 lines: Use an ACL with less than 416 lines.
•
CSCdv77966
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(19)S or a higher
release, the CPU utilization of a 10-port 1-Gigabit Ethernet line card goes up to 100 percent if the
card receives packets with the “Don’t Fragment” bit set to 1 and these packets must be fragmented.
After two or three minutes, the Forwarding Information Base (FIB) becomes disabled with the
following error message:
Nov 2 10:08:41: %FIB-3-FIBDISABLE: Fatal error, slot 5: No window message, LC t o RP
IPC is non-operational
There is no workaround.
•
CSCdv79054
A Cisco 7500 series router that is configured with a PA-MC-STM1 port adapter may lose a few
hundred bytes of memory each time a channel group is added and deleted. There is no workaround.
•
CSCdv79980
Significant throughput degradation may occur on a PPP multilink if the fragment delay on a 2-port
multichannel E1 port adapter (PA-MC-2E1) that is configured for channel groups is set to a value
that is lower than the default value. There is no workaround.
•
CSCdv80459
If you enter the show controller frfab traffic-shape 1 0 127 command on an Engine 4 line card that
is installed in a Cisco 12000 series Internet router, the line card may reload. There is no workaround.
•
CSCdv81042
A Cisco 12000 series Internet router may generate shutdown messages for its power supplies, but
the power supplies work fine and the LEDs do not indicate any problems. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2224
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdv81088
On a Cisco 12000 series Internet router, when a Gigabit Interface Converter is removed from and
then reinserted in a 1-port Gigabit Ethernet line card that is switching multicast traffic, the line card
reloads. There is no workaround.
•
CSCdv81133
On a Cisco 12000 series Internet router, when you connect and disconnect the Rx cable between
Engine 4 Packet-over-SONET (POS) line cards and a Cisco ONS platform, continuous ping failures
may occur, although the line cards are in an up/up state.
Workaround: Enter the hw-module slot x reload command on the POS line cards.
•
CSCdv82664
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(18)S1, when the
1-port OC48/POS line card is configured with the rate-limit input command and the
set-prec-transmit command is set to 1, the line card fails to ping the far-end router. When the
set-prec-transmit command is set to 0, the ping is successful. There is no workaround.
•
CSCdv83917
If you repeatedly create and delete channel groups on a Cisco 7500 series router that is configured
with a PA-MC-STM1 port adapter, the router may reload. There is no workaround.
•
CSCdv84086
In Cisco IOS software that is running Multiprotocol Label Switching (MPLS) Traffic Engineering
(TE), the Link Management (LM) module may remove a Label Switched Path (LSP) while it is in
the process of preempting other LSPs in order to admit the original one. This may result in a
software reload.
This condition may occur if immediately after receiving a reservation request for an LSP, the
Resource Reservation Protocol (RSVP) receives a teardown request for the same LSP. The problem
is only triggered when preemption of other LSPs is necessary in order to admit the LSP in question,
and when an unlikely timing of interactions between LM and RSVP occurs.
•
CSCdv84259
If you globally enable the ip cef distributed command on a Cisco 7500 series router, a non-Versatile
Interface Processor (VIP) interface will come up with the ip route-cache distributed command
enabled by default, causing some features to fail.
Workaround: Configure the no ip route-cache distributed command on a non-VIP interface.
•
CSCdv85106
On a Cisco 12000 series 1-port Gigabit Ethernet line card, if you ping an Engine 4 1-port
OC192/POS line card or an Engine 4 4-port OC48/POS line card, datagrams are dropped. The first
packet-size ranges to fail are the packets from 36 through 45 and from 1501 through 1525. From
1501 on, packet sizes fail at intervals of 1480 packets: from 2981 (that is, 1501 + 1480) packets are
again dropped for 24 packets and then get through again for another 1480 packets, and so on. There
is no workaround.
•
CSCdv86327
When tag switching is enabled on a Cisco 12000 series Engine 4 Packet-over-SONET line card, the
output committed access rate (CAR) counter counts the wrong exceeded IP-to-tag packets. There is
no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2225
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdv86429
If you enter the clear ip mds forwarding command on a line card that is installed in a Cisco 12000
series Internet router that is running Cisco IOS Release 12.0(20)S or Release 12.0(20)ST, the
Multicast Forwarding Information Base (MFIB) may end up being incomplete and may stop traffic
form being forwarded.
Workaround: Enter the clear ip mroute * command on the Route Processor to restore traffic
forwarding.
•
CSCdv87400
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)S, the output
interface IP byte counters on an Engine 4 or Engine 4 plus line card may be incorrect. There is no
workaround.
•
CSCdv87559
When you enable distributed tag switching on a serial interface on a Cisco 7500 series
PA-MC-STM-1 port adapter and a packet cannot be switched by the Versatile Interface Processor
(VIP), the packet may be dropped without being switched by the Route Switch Processor (RSP).
There is no workaround.
•
CSCdv88431
An online insertion and removal (OIR) of a Cisco 12000 series Engine 4 Packet-over-SONET (POS)
line card may cause the line card to pause indefinitely in the “PWR ON” state.
Workaround: Continue to perform an OIR until the line card comes up correctly.
•
CSCdv88646
A Cisco 12000 series Internet router that is configured with an Engine 4 plus card may generate
tracebacks, causing Cisco Express Forwarding (CEF) to be disabled. There is no workaround.
•
CSCdv89042
Traffic may fail when you enable Sampled NetFlow on any physical interface of a Cisco 12000
series Engine 2 Packet-over-SONET (POS) line card. This condition may be seen with any type of
TCP/IP traffic. There is no workaround.
•
CSCdv89193
When you perform an online insertion and removal (OIR) of the primary Clock and Scheduler Card
(CSC) in a Cisco 12000 series Internet router while multicast traffic is being sent to a large number
of multicast groups, all line cards in the router will reload.
Workaround: Do not perform an OIR of the primary CSC when multicast traffic is passing through
the router to a large number of multicast groups.
•
CSCdv89200
If you remove a Turbo access control list (ACL) from a Cisco 12000 series line card while traffic is
being processed, the line card will reload. There is no workaround.
•
CSCdv89241
If you configure an output access control list (ACL) on a Cisco 12000 series Engine 2 line card, the
line card may reload. There is no workaround.
•
CSCdv89507
When you insert for the first time an OC-48c/STM-16c DPT line card in a Cisco 12000 series
Internet router and you do not enter the hw-module <slot- x> srp command, the router may reload
with a bus error. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2226
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdv89964
If you first apply a policy map to the TX side of an interface and then apply it to the to RX side of
the same interface, all the incoming packets on this interface will get dropped.
Workaround: First apply the policy-map to the RX side of the interface and then apply it to the TX
side.
•
CSCdv90122
When a large output access control list (ACL) is applied on an Engine 3 line card that is installed in
a Cisco 12000 series Internet router, the following error message may be displayed for a slot that
contains an Engine 2 line card:
%SYS-4-EXMALLOCFAIL: External memory allocation of 20971520 bytes failed from EXMEM 1
There is no workaround.
•
CSCdv90383
The output committed access rate (CAR) on a tag-enabled Cisco 12000 series Engine 4
Packet-over-SONET (POS) line card will not take effect if the ingress line card is an Engine 3 line
card. There is no workaround.
•
CSCdv90560
After an upgrade from Cisco IOS Release 12.0(18)ST to Cisco IOS Release 12.0(19)S, a
Cisco 12000 series Internet router may lose the connection with the switching fabric after having
recognized the switching fabric after the reboot. When the router recognizes the switching fabric,
the following message will be displayed:
Primary Clock is CSC_0
Fabric Clock is Non Redundant
Bandwidth Mode: Full Bandwidth
*Nov 15 04:51:01.411: %MBUS-6-FIA_CONFIG: Switch Cards 0x1D (bit mask); Primary Clock
CSC_0
When the router loses the connection with the switching fabric, the following error messages will
be displayed:
.Nov
.Nov
.Nov
.Nov
15
15
15
15
12:39:26.885:
12:39:27.885:
12:39:28.885:
12:39:29.885:
%MBUS-6-OIR:
%MBUS-6-OIR:
%MBUS-6-OIR:
%MBUS-6-OIR:
Switch Fabric Card 16XOC48 Removed from Slot 18
Switch Fabric Card 16XOC48 Removed from Slot 19
Switch Fabric Card 16XOC48 Removed from Slot 20
Clock Scheduler Card 16XOC48 Removed from Slot 16
Nov 15 12:40:11.193: %MBUS-0-NOCSC: Cannot find CSC card in slot 16
Nov 15 12:40:11.317: %MBUS-0-NOCSC: Must have at least 1 CSC card
Nov 15 12:40:18.917: %FABRIC-3-CRC: Switch card 16
There is no workaround.
•
CSCdv90792
A 3-port Gigabit Ethernet line card that is installed in a Cisco 12000 series Internet router that is
running Cisco IOS Release 12.0(16)S or higher 12.0(16)S releases may reload intermittently with
“PSAERRSS” errors and bus errors under the following conditions:
a. At least five output access control lists (ACLs) are configured on the router (the sixth output
ACL is being handled by the CPU of the line card).
b. Ingress traffic that is destined for egress on the local line card is matching access control entries
(ACEs) that are being executed on the ingress CPU.
c. A large volume of Border Gateway Protocol (BGP) routes are present.
d. The above-mentioned traffic scenario occurs during periods of heavy changes in the Forwarding
Information Base (FIB).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2227
Resolved Caveats—Cisco IOS Release 12.0(21)S
“FIB-4-RADIX” insert messages may be displayed before the line card reloads.
This issue is resolved in Cisco IOS Release 12.0(16)S7 and higher releases. There is no workaround
for the affected releases.
•
CSCdw00005
When a channelized port adapter (CT3) is used and if framing is reconfigured with the t1 1 framing
esf privileged EXEC command, certain interfaces that are configured on that T1 line may stop
passing traffic. This condition occurs only if the t1 1 framing esf privileged EXEC command is
entered after channel groups are already configured on the T1 line and while the channel groups are
passing traffic. The framing needs to be set only for the T1 line when the first channel group is
configured and does not need to be reentered when a new channel group is added.
Workaround: Enter the t1 1 framing esf privileged EXEC command only when the first interface on
a T1 line is configured.
•
CSCdw00011
When a channelized T3 port adapter (CT3) that is configured with multiple channel groups is used,
all interfaces may stop passing traffic if T1 frames are received on one of the groups that has voice
signaling enabled.
Workaround: To clear this condition, shut down the interface that corresponds to the channel group
that is receiving the invalid frame. If any of the other interfaces continues to flap after the interface
that is receiving the invalid frame is shut down, the interface has to be reconfigured.
•
CSCdw00500
When you copy a configuration file from a File Transfer Protocol (FTP) server to a Cisco router, a
one-time password tool such as SecurID does not work because the Cisco IOS software establishes
multiple sessions to the FTP server with the same password.
Workaround: Do not use a one-time password tool.
Alternative workaround: To copy the configuration file, use another protocol, such as the TFTP or
the remote copy protocol (RCP).
•
CSCdw01226
An Engine 4 line card that is running Cisco IOS Release 12.0(17)ST3 may reload repeatedly and
enter the REQ DUMP state. There is no workaround.
•
CSCdw02485
After you enter the encapsulation ppp command on a channelized interface during the configuring
of distributed Multilink PPP (dMLPPP) on an 8-port multichannel T1/E1 port adapter, a FlexWAN
module may reload.
Workaround: Complete the configuration after the FlexWAN module has reloaded.
•
CSCdw02869
A Cisco 7206VXR router that is configured with Multiprotocol Label Switching (MPLS) and the
Web Cache Communication Protocol (WCCP) may reload because of a bus error and display the
following message in the log:
%ALIGN-1-FATAL: Corrupted program counter pc=0x0, ra=0x60F82504, sp=0x628D48F0
%ALIGN-1-FATAL: Corrupted program counter pc=0x0, ra=0x60F82504, sp=0x628D48F0
The crashinfo file will contain the following message:
Unexpected exception, CPU signal
$0 : 00000000, AT : 00000030, v0
a0 : 6333CA68, a1 : 628A1428, a2
t0 : 0000883E, t1 : 62BF8700, t2
10, PC = 0x0
: 00000000, v1 : 00000001
: 5E19160A, a3 : 6325DB98
: 629D80A0, t3 : 625D0000
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2228
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
t4 : 00000030, t5 : 00000000, t6 : D4989620, t7 : 6333CA68
s0 : 00000003, s1 : 00000000, s2 : 62942B80, s3 : 628A144C
s4 : 6293B998, s5 : 628A1428, s6 : 6293A714, s7 : 5E1915E0
t8 : 6060E108, t9 : 62A62468, k0 : 00000000, k1 : 00000000
gp : 6238A280, sp : 628D48F0, s8 : 628D4BA8, ra : 60F82504
EPC : 00000000, ErrorEPC : 604E54D4, SREG : 3400F903
Cause 00000008 (Code 0x2): TLB (load or instruction fetch) exception
-Traceback= 0 60F82504 60F81F58 60F89848 601053F0 601091A0
Workaround: Disable the WCCP redirection.
•
CSCdw03079
When you make thousands of calls, the “IPC LC Message Handler” process uses a high amount of
the CPU because of the statistics update. There is no workaround.
•
CSCdw03179
When you configure a Packet-over-SONET 8xOC-3 line card in a Cisco 12000 series Internet router
as an Automatic Protection Switching (APS) working or protecting line card, the line card may
accept input traffic even while it is deselected by APS. This condition causes duplicated packets.
Workaround: When the error condition occurs, enter the shutdown command followed by the no
shutdown command on the line card that is deselected by APS.
•
CSCdw03264
If you perform a copy operation from the TFTP server to the running configuration file in order to
copy access control entries (ACEs) to access control lists (ACLs) that are already applied to an
interface of a Cisco 12000 series Engine 3 line card, the router reloads.
Workaround: First copy the ACEs to the running configuration file and then apply the ACLs to the
interface.
•
CSCdw04701
The Cisco Discovery Protocol (CDP) is disabled by default on a Cisco 10000 series edge services
router. You can enable the CDP by entering the cdp run global configuration command on each
interface.
After you have saved the configuration and reloaded the router, the cdp run global configuration
command is saved in the configuration. However, the CDP commands on the interfaces are not saved
in the configuration and you have to manually reenter the cdp enable command on each interface.
There is no workaround.
•
CSCdw05061
A line card that is installed in a Cisco 12000 series Internet router that is running Cisco IOS
Release 12.0(19)S1 may slowly lose its available memory. The memory allocation of the “LC IP
Source Tracker Export” process, which you can display by entering the show processes memory
command, will increase at a rate of about 416 bytes per minute.
Partial workaround: Enter the ip source-track export interval 120 configuration command to
reduce the leak rate to 104 bytes per minute.
•
CSCdw06558
A Cisco 12000 series Internet router with about 500 or more tunnels configured may reload if you
enter the no mpls traffic-eng tunnels command. There is no workaround.
•
CSCdw06785
On a Cisco 12000 series Internet router, Sampled NetFlow may report a source interface incorrectly.
There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2229
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdw07376
When the same access control list (ACL) is applied as an output ACL to several interfaces on a
Cisco 12000 series Internet router and you reload the router, the ACL no longer works correctly.
Workaround: Reload the microcode onto the line card or line cards with the interfaces to which the
output ACL is applied.
Alternative workaround: Reapply the ACL to the interfaces.
•
CSCdw07833
If you unshut (restart) a Cisco 12000 series line-card interface to which an access control list (ACL)
is applied, the line card reloads and generates a “Profile Manager” failure message. There is no
workaround.
•
CSCdw08646
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(21)S, IP-to-IP
fragmentation does not occur on a 3-port Gigabit Ethernet line card, regardless of whether the
ingress and egress line cards are the same or not. When you configure a maximum transmission unit
(MTU) on port 0 of the egress card and the MTU is larger than the packet that is to be sent, the
fragmentation will not occur. There is no workaround.
•
CSCdw09570
If you use the debug condition interface command to enable conditional debugging on an interface,
some serial debugs—notably High-Level Data Link Control (HDLC) keepalive debugs—will also
be enabled, even if you do not set the debug serial interface command. There is no workaround.
•
CSCdw10550
On an interface of a Cisco 7500 series router, if the input service policies have the same classes as
the output service policies and you cause an invalid configuration by attaching an input service
policy with the same queuing feature that is already enabled on the output service policy, the input
service policy will be denied. If you then try to update the output service policy, the router may
reload.
Workaround: First remove the output service policy from the interface and then reconfigure and
update the output service policy.
•
CSCdw11216
Even though a slot on a Cisco 12000 series Internet router is not populated with a line card and no
online insertion and removal (OIR) message was displayed when a line card was inserted and
removed from the slot, the router may display the following messages:
%MBUS-3-EEPROM: Failed read EEPROM location 1 in slot 0 detecting bad h/w at startup
%MBUS-3-READREG: Failed to read register 20000 in slot 0 show controller fab_clk_fpga
There is no workaround.
•
CSCdw11416
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(19)S and that has the
Cisco Group Management Protocol (CGMP) configured on a 3-port Gigabit Ethernet line card may
send out CGMP messages with an incorrect station MAC address. There is no workaround.
•
CSCdw13574
With more than one permanent virtual circuit (PVC) configured on a PA-A2 port adapter that is
installed in a Cisco 7200 series router, the port adapter can still receive output drops when the peak
cell rate (PCR) is reached. If you stop the traffic flow, the interface continues to take output drops
until you enter the shutdown command followed by the no shutdown command. There is no
workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2230
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdw15235
If you apply a policy map to an interface on a Cisco 12000 series Internet router that is running
Cisco IOS Release 12.0(16)S3, the router reloads. There is no workaround.
•
CSCdw15531
When you send tag packets to a Cisco 12000 series Engine 4 line card that is not enabled for
Multiprotocol Label Switching (MPLS), the line protocol of the line card will go down after about
200 packets. There is no workaround.
•
CSCdw18116
An interface of a PA-MC-T1 or PA-MC-E1 port adapter may experience an “Output Stuck”
condition, especially when it is configured in PRI mode. There is no workaround.
•
CSCdw19011
A PA-2E3 Packet-over-E3 port adapter may exhibit cyclic redundancy check (CRC) errors. There is
no workaround.
•
CSCdw20118
If you enter the copy rcp command to enable the remote copy protocol and you specify the
destination filename, the startup may fail with an error message that states that there is not enough
space on the device:
r01.nycmny01.us.bb#copy rcp: startup Address or name of remote host [eng0]? Source
username [jared]? Source filename [r01.nycmny01.us.bb-confg]?
r01.nycmny01.us.bb-confg Destination filename [startup-config]? startup-config
Accessing rcp://jared@eng0/r01.nycmny01.us.bb-confg...! %Error copying
rcp://jared@eng0/r01.nycmny01.us.bb-confg (Not enough space on device)
There is no workaround.
•
CSCdw20150
If you enter the no cos gsr tx command on a Cisco 12000 series Internet router that is configured
with Engine 4 line cards, packets may be switched to the wrong interfaces. There is no workaround.
•
CSCdw21652
Attaching a quality of service (QoS) service policy with bandwidth “kbps” classes to an ATM
permanent virtual circuit (PVC) may cause the following error:
bandwidth assignment must be at least 1% of link rate
Workaround: Use bandwidth percent in the QoS configuration.
•
CSCdw21954
An output committed access rate (CAR) rule that is configured on a Cisco 12000 series line card
may not be hit correctly.
Workaround: Reload the microcode onto the line card.
Alternative workaround: Reapply the output CAR rule to the line card.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2231
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdw24488
If working and protect Automatic Protection Switching (APS) Packet-over-SONET (POS)
interfaces are installed in different Cisco 12000 series Internet routers and the router that contains
the working interface reloads, the protect interface may not be activated, even after the reboot
process of the router that contains the working interface has been completed.
Workaround: Before you the reload the router that contains the working interface, enter the aps
manual 1 command on the protect interface to force the traffic to the protect interface.
Alternative workaround: After you have reloaded the router that contains the working interface,
enter the shutdown command followed by the no shutdown command on the working interface.
•
CSCdw24656
After you have entered the clear ip bgp command for neighbors that have a large number of prefixes,
an Engine 2 line card that is installed in a Cisco 12000 series Internet router may incorrectly drop
some high-priority packets that are destined for the router. This condition may result in a loss of
Border Gateway Protocol (BGP) keepalives, which will cause the BGP connection to reset. There is
no workaround.
•
CSCdw24762
If you use the hw-module slot slot-number shutdown command to perform an online insertion and
removal (OIR) of the primary Clock and Scheduler Card (CSC) of a Cisco 12000 series Internet
router during active traffic, an Engine 4 plus 4-port OC-48 line card may reload. There is no
workaround.
•
CSCdw24905
If you configure Multilink PPP (MLPPP) on a 6-port channelized T3 line card and you perform an
online insertion and removal (OIR) of the line card, the following error message and traceback will
occur:
%DMLPGRP-4-NOTCX3LINK: cannot remove the link because it is not CX3
-Traceback= 50312618 505E4400 505E7258 501BB5CC 501BB5B
There is no workaround.
•
CSCdw25090
A Cisco 7500 series router may reload because of a watchdog timeout. There is no workaround.
•
CSCdw25191
After many tag bindings (that is, thousands of tag bindings for hundreds of destinations) have been
established on a Cisco 7200 series router, entering the no tag ip global configuration command may
cause the router to reload.
Workaround: Instead of entering the no tag ip command at the router level, enter the command on
each interface individually.
•
CSCdw26742
If you inject a large number of routes (about 160,000) on an Engine 4 line card that is installed in a
Cisco 12000 series Internet router, the line card may reset. There is no workaround.
•
CSCdw26943
If you insert or remove a primary Clock and Scheduler Card (CSC) in or from a Cisco 12000 series
Internet router, an Engine 4 10-port Gigabit Ethernet line card may stop forwarding and receiving
traffic.
Workaround: Reload the microcode to restore the line card to normal operation.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2232
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(21)S
•
CSCdw29949
If you enable tag-to-tag load balancing on a Cisco 12000 series Internet router with an Engine 4 line
card that serves as an ingress line card, the router stops forwarding traffic.
Workaround: Enter the clear ip route * command.
•
CSCdw30397
An egress access control list (ACL) on an Engine 2 line card that is installed in a Cisco 12000 series
Internet router that is running Cisco IOS Release 12.0(21)S may cause an OC48/SRP line card to
fail. There is no workaround.
•
CSCdw32136
Launching the fabric downloader on a Cisco 12000 series line card with 128 MB of memory or less
may fail. This condition occurs when the ROM version of the fabric downloader is “downrev” and
you download through the maintenance bus (MBus).
“Downrev” means that either the major version of the ROM is different from the version that is
bundled with the running Cisco IOS software image or the major version of the ROM is the same
but the minor version of the ROM is lower than the required minor version for the running Cisco IOS
software image.
If the ROM version is “downrev”, the Cisco IOS software image tries to use the bundled version of
the fabric downloader, otherwise the ROM version is used.
Workaround: Change to a Cisco IOS software image that contains a good fabric downloader. In case
the non-working fabric downloader has been upgraded into the ROM, use a real old Cisco IOS
software image (such as a one-year old image) with a different major version of the fabric
downloader for the bootup process and then upgrade the fabric downloader in the ROM.
•
CSCdw32604
If you manually apply multiple committed access rate (CAR) rules, the following error messages
may display:
SLOT 3:00:42:03: %EE48-5-TM_PROC: TCAM Mgr Add Table not free(40), Alpha:RX Lbl:6183
Appl:3 fail: 40
or
SLOT 2:00:43:17: %TCAM_MGR-3-UNUSUAL_BUG_WARNING: Deleting mbu with refcount = 0 from
alloced mbus table mbu 44F45D3C free_array_index 0 region_id 14
Workaround: Copy the CAR rules from the TFTP server.
•
CSCdw37661
If you use the Modular QoS CLI (MQC) to apply the same committed access rate (CAR) rule to two
different interfaces and then you unconfigure and reconfigure the CAR rule on both interfaces, the
following error message may be displayed:
SLOT 6:00:01:52: %EE48-5-TM_PROC: TCAM Mgr Add Table not free(40), Alpha:RX Lbl:6148
Appl:3 fail: 40
Workaround: Copy the new configuration from the TFTP server instead of entering the configuration
manually.
•
CSCdw37768
Even after you have removed a line card from the slot of a Cisco 12000 series Internet router that is
running Cisco IOS Release 12.0(18)S, the router may still display messages that are associated with
the removed line card. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2233
Resolved Caveats—Cisco IOS Release 12.0(19)S4
•
CSCuk28769
If you enter the clear ip route * command or the clear cef linecard command, the Forwarding
Information Base (FIB) may become inconsistent with the Routing Information Base (RIB), which
could cause a forwarding loop. There is no workaround.
•
CSCuk30224
On platforms that support distributed Cisco Express Forwarding (dCEF), when CEF reloads the
forwarding table (FIB) on a line card, either at boot time or after an online insertion and removal
(OIR) event, the Forwarding Information Base (FIB) of the line card may be missing one or more
prefixes.
Workaround: Enter the clear cef linecard slot on the affected line card.
Wide-Area Networking
•
CSCdt57260
Pings are not passed with bridged PPP. There is no workaround.
•
CSCdv34579
Under heavy traffic conditions, a Versatile Interface Processor (VIP), Gigabit Ethernet Interface
Processor (GEIP), GEIP+, or Packet OC-3 Interface Processor (POSIP) that is installed in a
Cisco 7500 series router may reload. The VIP reload information contains the following error
message:
%DMA-1-DRQ_STALLED: DRQ stalled. Dumping DRQ.
There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(19)S4
Cisco IOS Release 12.0(19)S4 is a rebuild of Cisco IOS Release 12.0(19)S. All the caveats listed in
this section are resolved in Cisco IOS Release 12.0(19)S4. This section describes only severity 1
and 2 caveats.
•
CSCea02355
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
Resolved Caveats—Cisco IOS Release 12.0(19)S3
Cisco IOS Release 12.0(19)S3 is a rebuild of Cisco IOS Release 12.0(19)S. All the caveats listed in
this section are resolved in Cisco IOS Release 12.0(19)S3. This section describes only severity 1
and 2 caveats.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2234
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S2
•
CSCdv84788
A Versatile Interface Processor (VIP) may reload or record spurious access after class maps are
configured for Frame Relay. There is no workaround.
•
CSCdw24995
If a Cisco 12000 series Engine 2 line card forwards traffic with large Multicast Group ID (MGID)
numbers, spurious memory access errors may occur when the multicast routing table is cleared.
There is no workaround.
•
CSCdw63039
During low memory conditions, it is possible for the peer-group leader to not receive all routes.
There is no workaround to prevent this situation, but if this situation occurs, use the clear ip bgp
x.x.x.x soft out EXEC command to force Border Gateway Protocol (BGP) to resend updates to
x.x.x.x.
•
CSCdx06621
A Cisco router that is running Cisco IOS Release 12.1(13) or another Cisco IOS release may reload
with a bus error that is related to Open Shortest Path First (OSPF). There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(19)S2
Cisco IOS Release 12.0(19)S2 is a rebuild of Cisco IOS Release 12.0(19)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(19)S2. This section describes only severity 1 and 2
caveats.
•
CSCdv90792
A 3-port Gigabit Ethernet line card that is installed in a Cisco 12000 series Internet router that is
running Cisco IOS Release 12.0(16)S or higher 12.0(16)S releases may reload intermittently with
“PSAERRSS” errors and bus errors under the following conditions:
a. At least five output access control lists (ACLs) are configured on the router (the sixth output
ACL is being handled by the CPU of the line card).
b. Ingress traffic that is destined for egress on the local line card is matching access control entries
(ACEs) that are being executed on the ingress CPU.
c. A large volume of Border Gateway Protocol (BGP) routes are present.
d. The above-mentioned traffic scenario occurs during periods of heavy changes in the Forwarding
Information Base (FIB).
“FIB-4-RADIX” insert messages may be displayed before the line card reloads.
This issue is resolved in Cisco IOS Release 12.0(16)S7 and higher releases. There is no workaround
for the affected releases.
•
CSCdw10748
A Cisco 12016 Internet router that is running Cisco IOS Release 12.0(15)S, Release 12.0(19)S, or
any release in between these releases may not correctly switch over to the backup Clock Scheduler
Card (CSC) in the event of a CSC failure because of a “grant parity” or “request parity” error. If one
of these errors occurs, the following message may be seen in the output of the show log command:
Sep 22 03:00:56.674 JST: %FABRIC-3-PARITYERR: To Fabric parity error was detected.
Grant parity error Data = 0x2.
SLOT 1:Sep 22 03:00:56.674 JST: %FABRIC-3-PARITYERR: To Fabric parity error was
detected. Grant parity error Data = 0x1
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2235
Resolved Caveats—Cisco IOS Release 12.0(19)S1
The output of the show controller fia command may look as follows:
Fabric configuration: Full bandwidth redundant
Master Scheduler: Slot 16
From Fabric FIA Errors
-----------------------redund fifo parity 0
crc32 lkup parity
0
Switch cards present
16
cell drops 116
cell parity
crc32
0x001F
Switch cards monitored
Slot:
redund overflow 0
0x001F
17
Name:
csc0
-------- -------los
0
16 17 18 19 20
Slots
16 17 18 19 20
18
csc1
-------1
0
Slots
19
sfc0
-------0
sfc1
-------0
0
20
sfc2
-------0
state
Off
Off
Off
Off
Off
crc16
1167
402
1167
1167
1167
To Fabric FIA Errors
---------------------sca not pres 0
req error
xx
uni fifo overflow 0
grant parity xx
multi req
0
uni fifo undrflow 0
cntrl parity 0
uni req
0
crc32 lkup parity 0
multi fifo
0
empty dst req 0
cell parity
0
handshake error
0
For further information, see the Fabric Parity Error on GSR CSC16 Card field notice at the
following location: http://www.cisco.com/warp/public/770/fn16872.shtml.
There is no workaround.
•
CSCdw17012
On a Cisco 12000 series Internet router that is configured with an Engine 4 line card that has
256 MB of CPU memory, the show processes memory command may show more than 4 GB of used
memory. When the counter reaches 4.2 GB, it may reset to 0, which causes the line card to think it
has run out of memory and to disable Cisco Express Forwarding (CEF). Issuing the clear cef
linecard [slot-number] command will bring the line card back up. There is no workaround for the
memory problem or to prevent the counter from resetting to 0.
•
CSCdw65903
An error can occur with management protocol processing. Please use the following URL for further
information:
http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdw65903
Resolved Caveats—Cisco IOS Release 12.0(19)S1
Cisco IOS Release 12.0(19)S1 is a rebuild of Cisco IOS Release 12.0(19)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(19)S1. This section describes only severity 1 and 2
caveats.
•
CSCds37169
When IP Cisco Express Forwarding (CEF) is enabled on a Route Switch Module (RSM) and you
reload the RSM, the interfaces show that the no ip route-cache cef interface configuration command
is enabled, which causes the CPU to run at 99 percent.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2236
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S1
Workaround: Manually change the configuration.
•
CSCds81716
On a Versatile Interface Processor (VIP) console, a spurious memory access trace message may be
displayed when the serial interface comes up. There is no workaround.
•
CSCdt96253
Three different Cisco product lines are susceptible to multiple vulnerabilities in the Secure Shell
(SSH) protocol. These issues are inherent to the SSH protocol version 1.5, which is implemented in
several Cisco product lines.
By exploiting the weakness in the SSH protocol, it is possible to insert an arbitrary command into
an established SSH session, collect information that may help in brute force key recovery, or brute
force a session key.
The affected product lines are as follows:
– All devices, including routers and switches, running Cisco IOS software supporting SSH
– Catalyst 6000 switches running CatOS
– Cisco PIX Firewall
No other Cisco products are vulnerable.
It is possible to mitigate this vulnerability by preventing, or having a control over, interception of
SSH traffic. see the advisory at the following URL:
http://www.cisco.com/warp/public/707/SSH-multiple-pub.html
•
CSCdu05363
Selective packet discard (SPD) does not function on Gigabit Ethernet line cards (Engine 1 and
Engine 2) and Fast Ethernet line cards that are installed in a Cisco 12000 series Internet router.
Workaround: Increase the input hold queue to store the excess packets.
•
CSCdu35175
Six vulnerabilities involving the access control list (ACL) have been discovered in multiple releases
of Cisco IOS software for the Cisco 12000 series Internet router. Not all vulnerabilities are present
in all Cisco IOS releases, and only line cards based on the Engine 2 are affected by them. No other
Cisco product is vulnerable.
The workarounds are described in the “Workarounds” section of the advisory that is available at the
following URL:
http://www.cisco.com/warp/public/707/GSR-ACL-pub.shtml
Workaround: Use the shut command followed by the no shut command to flap the interface.
•
CSCdu81007
The Cisco Express Forwarding (CEF) table is not updated properly when the IP address of an
interface changes. The new IP address is added to the CEF table but the old one is not removed. If
subinterfaces are used, the old ones remain in the CEF table even after the subinterfaces are
removed.
Workaround: When you issue the shut command on the subinterface before changing the address,
the IP address is correctly deleted from the CEF tables.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2237
Resolved Caveats—Cisco IOS Release 12.0(19)S1
•
CSCdu81936
If a router receives an Address Resolution Protocol (ARP) packet that has the router’s own interface
address but with a different MAC address, the ARP packet can overwrite the router's own MAC
address in the ARP table, causing that interface to stop sending and receiving traffic. This attack is
successful only against interfaces on the Ethernet segment that is local to the attacking host.
Workaround: Hard-code the interface's ARP table entry by using the arp ip-address
hardware-address type [alias] command. This entry will remain in the ARP table until the clear arp
command is issued. see the advisory at the following URL:
http://www.cisco.com/warp/public/707/IOS-arp-overwrite-vuln-pub.shtml
•
CSCdu86853
A Cisco 7500 series router that is running Cisco IOS Release 12.0 S, 12.1, 12.2, or 12.1 E with a
2-port channelized T3 port adapter (PA-MC-2T3+) may report an incorrect FREEDM version for
the second port. The FREEDM version for the first port is shown correctly, but a version number of
zero (0) is shown as the version number for the second port. There is no workaround.
•
CSCdv19356
On Cisco 12000 series Internet routers, output packet and byte counters are sometimes reported too
high on Channelized T3 and DS3 line cards when the ingress rate is higher than the egress rate (for
example, OC-3 or OC-12 in and T3 or lower out). In this situation, packets are dropped. There is no
workaround.
•
CSCdv21302
On a 4xOC12 or 16xOC3 channelized ISE line card that is installed in a Cisco 12000 series Internet
router that is configured for Automatic Protection Switching (APS), after forcing a switchover via
the aps force 1 command and then reloading the protecting line card, there is no switchover back to
the working line card.
Workaround: Force the switchover back to the working line card by entering the shutdown
command followed by the no shutdown command.
•
CSCdv24152
A Cisco router that is running Cisco IOS Release 12.0(17)S and later 12.0 S releases may reset if
Frame Relay has been incorrectly configured. If you apply the same data link control (DLC) value
on an interface and on its subinterface twice in a row, the router may reset. There is no workaround.
•
CSCdv25238
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(19)S, the router may
not forward Multiprotocol Label Switching (MPLS)-encapsulated TCP packets correctly when it
has to POP the outer label. This situation also affects User Datagram Protocol (UDP)/Internet
Control Message Protocol (ICMP)-based traffic when the packet size equals 1500 bytes. A symptom
of this condition is giant frame counter increments on the interface. There is no known workaround.
•
CSCdv26031
The T3 controller on a 2CT3 port adapter does not come up (even if locally looped) if the controller
is receiving “loss of signal” messages. There is no workaround.
•
CSCdv32536
When a Cisco 7200 series router that is configured with an ATM-PA-A3 port adapter receives
packets with a multicast MAC address on a virtual circuit (VC) that has been configured for
1483-bridged mode, all packets with the multicast MAC address are dropped. There is no
workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2238
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S1
•
CSCdv37998
A Cisco 7500 series router that is running Cisco IOS Release 12.0(16)S1 with a channelized T3
(CT3) single wide port adapter on a Versatile Interface Processor (VIP) may experience flapping of
the interfaces that are created on the CT3 controller.
Workaround: Reload the VIP.
•
CSCdv42325
On a Cisco 12000 series Internet router, switching from load balancing to a fast adjacency or from
a fast adjacency to load balancing may result in traffic loss. There is no workaround.
•
CSCdv43694
On a Cisco 7500 series router, Distributed Multilink PPP (DMLPPP) and Versatile Interface
Processor (VIP) local switching may not work properly on a 2-port channelized T3 port adapter.
There is no workaround.
•
CSCdv47664
The online insertion and removal (OIR) of a Versatile Interface Processor (VIP) in a Cisco 7500
series router may cause Cisco Express Forwarding (CEF) to become disabled on VIP cards in other
slots.
Workaround: Enter the microcode reload global configuration command after a failed OIR.
•
CSCdv48810
On a Cisco 12000 series Internet routers that is running Cisco IOS Release 12.0(19)S, the Unicast
Reverse Path Forwarding (uRPF) feature on Packet-over-SONET (POS)-based Engine 2 line cards
yields low performance rates. This occurs for both basic uRPF and extended uRPF. There is no
workaround.
•
CSCdv51463
A Cisco router may experience problems with the Address Resolution Protocol (ARP) when Cisco
Express Forwarding (CEF) is enabled.
Workaround: Disable CEF.
•
CSCdv52657
On a Cisco router with an interface or subinterface that is configured with “new style” switched
virtual circuits (SVCs) that serve as network service-access points (NSAPs), when you select a SVC
for deletion, only the last-configured SVC may get deleted instead of the SVC that was selected for
deletion. There is no workaround.
•
CSCdv53563
On a Cisco 12000 series Engine 4 or Engine 4 plus line card, an IP multicast (S or G) flow may be
duplicated, which causes all downstream routers to receive duplicate packets. There is no
workaround.
•
CSCdv53894
A Cisco 12000 series Internet router may fail to correctly forward IP multicast packets out of an
interface. When this condition occurs, the router generates the following error message:
%GRP-3-ENCAP: Failure to allocate encap table entry, exceeded max number of entries
On the outgoing line card, the “exec slot N show controller rewrite” message (in which “N”
represents the line card) displays empty (0) adjacency information for the affected multicast routes:
(209.165.200.224, 255.255.255.224)
SRP0/0
In: POS3/0
0x00000000 (0):
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2239
Resolved Caveats—Cisco IOS Release 12.0(19)S1
There is no workaround.
•
CSCdv59181
On a Cisco 12000 series 1-port Gigabit Ethernet line card with a SALSA ASIC, an access control
list (ACL) on a VLAN does not work. There is no workaround.
•
CSCdv61178
On a Cisco 7500 series router that is running Cisco IOS Release 12.0(19)S, a VIP4-80 with an
OC-12 ATM multimode port adaptor reloads when an ATM subinterface is configured with ATM
adaptation layer 5 (AAL5) Subnetwork Access Protocol (SNAP) bridge encapsulation and the
following input and output rate limits:
rate-limit i 10k 5k 5k co tr ex dr
rate-limit o 10k 5k 5k co tr ex dr
There is no workaround.
•
CSCdv63849
On a Cisco 12000 series Internet router that is functioning in a Multiprotocol Border Gateway
Protocol (MBGP) and Multiprotocol Label Switching (MPLS) environment, a Gigabit Ethernet
(GE) line card that is configured with an async interface and the ip multicast-routing distributed
and ip mroute-cache distributed commands does not transmit multicast traffic from slot 0.
Workaround: Issue the shutdown command followed by the no shutdown command.
First alternative workaround: Remove the configuration of the async interface.
Second alternative workaround: Issue the no ip mroute-cache command on the GE line card.
•
CSCdv74675
If a Border Gateway Protocol (BGP) peer-group is configured for unicast and multicast routes,
multicast-routing information may be advertised to a peer-group member that did not negotiate to
receive IPv4 multicast routes, causing this member to send a notification that a required attribute is
missing.
Workaround: Upgrade the peer-group member that is sending the notification that a required
attribute is missing to the same software as the router that is sending the multicast-routing
information.
First alternative workaround: Configure the router that is sending the notification that a required
attribute is missing to negotiate for IPv4 multicast routes.
Second alternative workaround: Configure the router that is sending the multicast-routing
information in such a way that the peer-group members that are accepting only unicast routes are in
one peer-group and the peer-group members that are accepting both unicast and multicast routes are
in another peer-group.
•
CSCdv81042
A Cisco 12000 series Internet router may generate shutdown messages for its power supplies, but
the power supplies work fine and the LEDs do not indicate any problems. There is no workaround.
•
CSCdv81133
On a Cisco 12000 series Internet router, when you connect and disconnect the Rx cable between
Engine 4 Packet-over-SONET line cards and a Cisco ONS platform, continuous ping failures may
occur, although the line cards are in an up/up state.
Workaround: Issue the hw-module slot x reload command on the line cards.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2240
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S
•
CSCdv88646
A Cisco 12000 series Internet router that is configured with an Engine 4 plus card may generate
tracebacks, causing Cisco Express Forwarding (CEF) to be disabled. There is no workaround.
•
CSCdw04221
When you perform a test loop on a Very Short Reach (VSR) OC-192 line card that is installed in a
Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(19)S, the line card may
reload with an error message that indicates that the program counter is corrupt. There is no
workaround.
•
CSCuk26683
If IP is disabled (by entering the no ip address interface configuration command) on an interface
while Cisco Express Forwarding (CEF) is globally disabled and then CEF is enabled, the interface
may show inconsistencies when the show cef interface EXEC command is entered. In the case of
distributed platforms, this sequence could result in inconsistencies between the line card and the
Route Processor in which the network prefixes and the host prefix show up in the CEF table when
IP is disabled on the interface.
The sequence to reproduce this situation is as follows:
ip cef distributed
!
interface lo 2
ip address 1.0.0.1 255.255.255.0
!
no ip cef
interface lo 2
no ip address
shut
!
ip cef distributed
Workaround: Enable IP on the interface while CEF is enabled, and then disable the interface.
•
CSCuk27873
A Cisco router may reload if a line card runs out of memory and causes distributed Cisco Express
Forwarding (dCEF) to disable itself while dCEF is in the process of forwarding a traffic load. There
is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(19)S
All the caveats listed in this section are resolved in Cisco IOS Release 12.0(19)S. This section describes
only severity 1 and 2 caveats.
Basic System Services
•
CSCdt06162
On a Cisco 12000 series Internet router, the 1-minute input rate statistics in the output of the show
interfaces privileged EXEC command may not accurately reflect the traffic load on the interface.
There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2241
Resolved Caveats—Cisco IOS Release 12.0(19)S
Interfaces and Bridging
•
CSCdp88674
ATM subinterfaces might appear as INACTIVE when you use the show atm vc privileged EXEC
command. This symptom occurs when you add new subinterfaces to the router. Using the shut and
the no shut commands on the subinterface does not correct the problem.
Workaround: Use the shut command followed by the no shut command on the main interface to
bring the state to ACTIVE.
•
CSCdu66138
ATM half bridging is not supported on the ATM OC-12 port adapter. There is no workaround.
•
CSCdu88600
Bridged-style permanent virtual circuits (BPVCs) half-bridging commands are not implemented
with the new group of ATM commands. There is no workaround.
IP Routing Protocols
•
CSCdt92114
Cisco Express Forwarding (CEF) may behave inconsistently with routing protocols that use
holddown to protect against suboptimal routing. A route in holddown should be used to forward
traffic until routing protocol timer expiration and/or convergence. CEF, however, removes the
forwarding information from the Forwarding Information Base (FIB) immediately upon the route
entering holddown. Process and fast switching will continue to forward traffic as expected. There is
no workaround.
•
CSCdu01537
Under certain circumstances in a redundant topology, traffic loss can occur for up to 60-seconds
after the designated router (DR) has rebooted. There is no workaround.
•
CSCdu26591
When Border Gateway Protocol (BGP) routing is repeatedly enabled and disabled by entering the
router bgp as-number and no router bgp as-number commands, the system may lose memory. This
situation may result in memory corruption, and in some cases, the system may reload.
Workaround: Do not toggle BGP routing dynamically. Once BGP routing is disabled, save the
configuration and reload the system.
•
CSCdu32820
A router with a configuration containing IP static routes with an administrative distance of 115 may
reload when the Intermediate System-to-Intermediate System (IS-IS) Protocol Partial SPF is run.
This problem occurs regardless of whether the static route is redistributed into IS-IS. This behavior
has been observed on Cisco 2500 series and 3600 series routers that are running Cisco IOS Release
12.0(10)S, 12.0(7)T, 12.1(5), or 12.1(8). An error message similar to the following may be observed
in the log as a result of the crash:
%CLNS-1-LINKERR: ISIS: LSP prev doesn.t point at head in 0x1C524E, lsp_next 0x0,
lsp_prev 0x0, index 0, ver 0, head 0x155AAC -Traceback= 37C5006 37C52E4 37C55FC
37A1A00 37A1C5A 37A2750 37C2428 37C2FF2 37B7B6A 37B82C8
An IP static route with an administrative distance of 114 or 116 does not cause a reload.
Workaround: Use an administrative distance other than that of 115 since 115 conflicts with IS-IS.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2242
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S
•
CSCdu41549
A Cisco router that is using the CSCds88981 patch may reload with the following stack trace:
ip_midb_compare_idb(0x606299e8)+0x20 avl_search(0x60907100)+0x40
wavl_search(0x60907d68)+0x94 ip_get_midb_tree(0x6062cd78)+0x68
ip_get_midb(0x6062ce0c)+0x10 ip_delete_mroute_idb(0x6062b124)+0x58
ip_rpf_check_mroute(0x60631560)+0x3a8 ip_age_one_mroute(0x6062f828)+0x3b8 ...
Workaround: Remove the ip multicast boundary access-list-number interface configuration
command from the interfaces to prevent the router from reloading.
•
CSCdv04214
A Cisco router may reload when it is attempting to generate an Open Shortest Path First (OSPF)
summary or external Link-State Advertisements (LSAs) in low memory conditions. There is no
workaround.
ISO CLNS
•
CSCdu79294
A Cisco 7500 router may reload when Intermediate System-to-Intermediate System (ISIS) is
configured after software alignment correction is disabled using the no service align detect
command.
Workaround: Do not disable software alignment correction when configuring ISIS.
Miscellaneous
•
CSCds08358
An Enhanced Gigabit Ethernet Interface Processor (GEIP+) will sometimes return a wrong cardtype
on Simple Network Management Protocol (SNMP). The GEIP+ should return a value of 199, but in
this situation, the GEIP+ returns the value of 427, which is the card type for a Gigabit Ethernet port
adapter (PA-GE). There is no workaround.
•
CSCds27962
IP precedence is not set on multicast packets using input Committed Access Rate (CAR) with an
access list. This situation does not exist if Cisco Express Forwarding (CEF) is turned off on an
interface that is configured with the rate-limit interface configuration command. Unicast packets
work correctly with CEF and precedence set. There is no workaround.
•
CSCds30714
A Cisco AS5800 series universal access server that is running Cisco IOS Release 12.1(2a)XH1 or
12.1(3a)T1, and that is operating under a heavy load may experience a system reload because the
system temporarily runs out of memory for the interprocess communication (IPC) header cache.
There is no workaround.
•
CSCds61495
A Versatile Interface Processor (VIP) may produce spurious access messages under heavy loads.
Workaround: Use the Cisco IOS release that contains the fix for this caveat.
•
CSCds78612
On Cisco 12000 series Engine 2 and Engine 4 line cards, a CPUHOG message similar to the
following may be displayed during the Forwarding Information Base (FIB) update:
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2243
Resolved Caveats—Cisco IOS Release 12.0(19)S
%SYS-3-CPUHOG: Task ran for 11012 msec (334/0),process = CEF IPC Background, PC =
400AE140.
In a large prefix configuration with no static default route, if a routing protocol adds or changes a
default route, this CPUHOG may extend beyond a timeout on the line cards, and may cause a reload
with the following message:
%GRP-3-COREDUMP: Core dump incident on slot 1, error: Fabric ping failure (seq:167767)
Workaround: Configure a placeholder default route static route, such as “ip route 0.0.0.0 0.0.0.0
null0”.
•
CSCds78877
A Cisco 12016 series Internet router with two clock switched cards (CSCs) may display the
following error messaged during a cold boot (the second CSC is installed for redundancy):
MBUS-3-BADCLK: Slot 0 does not see fabric clock from CSC_0 Card will not operate on
fabric using this clock
Possible workarounds: Perform one of the following actions:
– After the error message is displayed, reload the Cisco 12016 series Internet router with a warm
boot, and verify that the redundant CSC has been accepted by the system with the show
controllers clock EXEC command.
– Reseat the CSC that is specified by the error message.
•
CSCds85383
For Cisco 12000 series Internet routers that have 6-port channelized T3 (CT3) line cards and that
are running Cisco IOS Release 12.0(14)S to 12.0(17)S, the state of T3s or T1s may be reported
incorrectly, and CT3 interfaces may remain down even though the corresponding T1s are up but
reported as down. The output of the show ipc status EXEC commands on the router processor
indicate that some interprocess communication (IPC) messages have timed out.
Workaround: Reset the line card.
•
CSCdt38708
A 1500-byte IP packet with three Multiprotocol Label Switching (MPLS) labels cannot be received
on a Fast Ethernet or Gigabit Ethernet interface because the packet will be counted as a giant and
dropped. There is no workaround.
•
CSCdt72044
On a Cisco router that has Generic Routing Encapsulation (GRE) or IPinIP tunnels configured, an
input access list on a physical interface will fail to deny GRE or IPinIP encapsulated packets.
Workaround: Configure a key on the GRE tunnel interfaces. Traffic going in and out of the tunnel
interfaces will then be process switched. There is no workaround for IPinIP tunnel interfaces.
•
CSCdt78402
A line card may reload when an additional static route is added to support load balancing and to
change the tag forwarding table. This condition occurs when load-balanced external Border
Gateway Protocol (eBGP) is enabled along with tag switching on all interfaces. There is no
workaround.
•
CSCdt85206
A Cisco 7200 Internet router that is running Cisco IOS Release 12.1 with a multichannel DS1/PRI
port adapter (PA-MC-4T1) may experience calls that pause indefinitely. The calls that are dropped
will not get reestablished. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2244
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S
•
CSCdt85356
A Versatile Interface Processor (VIP) may reload with distributed Cisco express forwarding (dCEF)
and Multiprotocol Label Switching (MPLS) configured on a tunnel interface after the following
sequence of commands:
no interface tunnel x
interface tunnel x
microcode type sys slot
There is no workaround.
•
CSCdt97325
Cisco routers that are running Cisco IOS Release 12.1, 12.2, or 12.0S with an Advanced Technology
Attachment (ATA) sandisk card (of any capacity) may pause indefinitely or be slow to respond to
command-line interface (CLI) command input when the SNMP FlashMIB is queried. The FlashMIB
queries may also timeout. This problem occurs when the inode numbers of the files in the ATA
sandisk are not sequential and when there is a large difference in the inode numbers.
The following is an example of a directory list with inode numbers that are likely to cause an SNMP
timeout when the Flash MIB is queried:
gt3-7200-3#dir disk1: Directory of disk1:/
3 -rw- 1690 shankar
4 -rw- 1690 sara
5 -rw- 1690 sara1
6 -rw- 1690 sara12
7 -rw- 1690 sara123
8 -rw- 1690 sara1234
10 -rw- 1690 sara12345
11 -rw- 1690 sara123456
12 -rw- 1690 7
9 drw- 0 directory-one
15 -rw- 8623108 c7200-is-mz.121-7.4
14 -rw- 3578452 c7200-boot-mz.del96042
2994 -rw- 4307448 c7200-boot-mz.flo96042
4046 -rw- 3578544 c7200-boot-mz.del96042first
Workaround: Exclude the ciscoFlashFileEntry MIB from FlashMIB queries.
•
CSCdu03684
A Cisco 12000 series Internet router that is running Cisco IOS 12.0(16.6)S may experience
100 percent route processor utilization when Multiprotocol Label Switching (MPLS) fragmentation
is configured.
Workaround: Do not change the size of the default maximum transmission unit (MTU) on the
interfaces when running MPLS.
•
CSCdu10213
A Label Edge Router (LER) that is running the c7200-p-mz.122-0.18 or the rsp-pv-mz.122-0.18
image of Cisco IOS Release 12.0(18) may experience tagged virtual circuits (TVCs) that are held in
the “bindwait” state if router flapping occurs on the paths from the LER to some destinations that
have TVCs configured. This problem occurs even when alternate paths exist.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2245
Resolved Caveats—Cisco IOS Release 12.0(19)S
Workaround: Enter the shut command followed by the no shut command on the interfaces on the
LER.
•
CSCdu13460
A Cisco 12000 series Internet router with an OC-192 Engine 4 line card may run out of memory
when the router receives more than 200,000 Border Gateway Protocol (BGP) and 4,000 Intermediate
System-to-Intermediate System (IS-IS) routes simultaneously.There is no workaround.
•
CSCdu13849
Multicast fragmentation may not work on egress interfaces on an Engine 4 line card. There is no
workaround.
•
CSCdu15053
The tailend of a tagged virtual circuit (TVC) may remain active while the headend of a TVC
becomes missing. This problem is triggered when TVCs are reestablished when better routes
become available due to change of topology. The new TVCs are set up normally, but the old TVCs
are not cleaned up properly. There is no workaround.
•
CSCdu16973
When cell-mode Multiprotocol Label Switching (MPLS) is used in a network of Cisco Catalyst 8500
switches with redundant paths, the conversion for MPLS after a routing change may take up to 4.5
minutes. Open Shortest Path First (OSPF) converges normally. There is no workaround.
•
CSCdu20643
Layer 2 Tunneling Protocol (L2TP) and Generic Routing Encapsulation (GRE) tunnels fail to
operate correctly on a Cisco 7500 series router that is running centralized Cisco Express Forwarding
(CEF). L2TP tunnels fail completely, whereas packets switched through a GRE tunnel will be fast
or process switched.
Workaround: Enable distributed CEF switching.
•
CSCdu26552
An ATM line card on a Cisco 12000 series Internet router may not send a Simple Network
Management Protocol (SNMP) trap after a reload, software forced reload, or online insertion and
removal (OIR). The router does not send the ATM link-down trap to the SNMP server. If a trap is
received, the following trap may be displayed by the SNMP server:
(E) Trap contains no readable strings
Some versions of SNMP software will not display this error message. There is no workaround.
•
CSCdu26757
A single-port Gigabit Ethernet line card may fail with Unicast timeouts. This situation occurs only
if bad IP packets are received by the last hop of a Multiprotocol Label Switching (MPLS)-enabled
network (for example, when the last tag is popped and the packet is sent out as an IP packet). There
is no workaround.
•
CSCdu29450
A Cisco 12410 series Internet router or a Cisco 12406 series Internet router may not report a five
volt power supply alarm. There is no workaround.
•
CSCdu32133
Distributed MPLS (VIP MPLS) does not work on Channelized STM1 port adapter. There is no
workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2246
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S
•
CSCdu33529
When a router interface is administratively shut down the switch or other connecting device will still
show the router as connected when it is not. This problem exists only on certain port adapters
(PA-2FE-TX, PA-2FE-FX, and PA-4E).
Workaround: Physically disconnect and reconnect the cable between the devices to force both sides
of the link down.
•
CSCdu34327
When IP precedence is rate limited individually by different rules on an Engine 4 line card (OC-192
or Quad OC-48), all Class of Service (CoS) features (such as Output Rate Shaping (ORS), Weighted
Random Early Detection (WRED), or Modified Deficit Round Robin (MDRR)) that are configured
on any line card in the same router should function normally.
If iCAR is configured on an Engine 4 line card so that there are at least two individual IP
precedences that are rate limited by the same rule, all CoS features (such as ORS, WRED, or
MDRR) that are configured on any line card in the same router will behave as if they are rate limited
by the same rule and go to the same queue.
When port aggregate iCAR is configured on an Engine 4 line card, all CoS features (such as ORS,
WRED, or MDRR) that are configured on any line card in the same router will stop functioning for
traffic that is sent from the Engine 4 line card. This configuration is regarded as a special case in
that all IP precedences (0-7) are rate limited by a single rule. There is no workaround.
•
CSCdu36136
A Spatial Reuse Protocol (SRP) port adapter may not recover from a data parity error on a peripheral
component interconnect (PCI) bus and may remain in an unstable state until an online insertion and
removal (OIR) is performed on the SRP port adapter or after the router is reloaded.
Workaround: Perform an OIR on the SRP port adapter or reload the router.
•
CSCdu37307
When new access list entries are added to a simple access control list (ACL) that has been previously
deleted using the no access-list access-list-number global configuration command, the ACL may
fail to become active.
Workaround: Remove the binding of the ACL from the interface and rebind the ACL using the no
ip access-group 1 interface configuration command followed by the ip access-group 1 interface
configuration command.
•
CSCdu38369
When Transmit (Tx) Side Weighted Random Early Detection (WRED) and ORS are enabled
simultaneously on a port, neither will take effect properly.
Workaround: Avoid using Tx WRED and ORS together.
•
CSCdu40761
Spurious access is observed on a Cisco 7500 series router when a serial link is added to a multilink
bundle while distributed Multilink PPP (dMLP) is running. There is no workaround.
•
CSCdu41117
A Cisco 12000 series Internet router with an Engine 4 line card may stop forwarding traffic and
reload under certain circumstances. There is no workaround.
•
CSCdu42275
Applying a large access-list (approximately 3,000 lines) to a Cisco 3-Port Gigabit Ethernet line card
may cause the router to reload. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2247
Resolved Caveats—Cisco IOS Release 12.0(19)S
•
CSCdu44102
When both input access control lists (ACLs) and output ACLs are enabled, Sampled NetFlow stops
functioning properly. There is no workaround.
•
CSCdu44294
When operation, administration, and maintenance (OAM) functionality is used on ATM permanent
virtual connections, spurious memory access may result. There is no workaround.
•
CSCdu47419
When a file with a size between number and number-1 clusters is copied to an ATA disk that has a
free space of number clusters, a truncated file may bee created with a “Bad DFS cluster data passed”
message. Each cluster is 4k in size. There is no workaround.
•
CSCdu47902
Inserting a large number of Border Gateway Protocol (BGP) routes may cause memory to become
fragmented and result in distributed Cisco Express Forwarding (dCEF) becoming disabled because
of a low memory condition. There is no workaround.
•
CSCdu48652
Voice calls may pause indefinitely when Flash MIBs for a vendor-specific Flash device located in
slot 0 or slot 1 of a Cisco 7200 series router are queried. Depending on the protocols that are running,
the calls may hang indefinitely or clear after a short period of time.
Workaround: Avoid querying the Flash device or remove the cards located in slot 0 or slot 1.
•
CSCdu48791
On a Cisco 12000 series Internet router that is running Cisco IOS version 12.0(17.6)S and
performing IP packet fragmentation, every attempt to configure an MPLS TE tunnel causes egress
line card crash if the egress line card is an E4 card (4xOC48, OC192).
The following error messages are generated:
%FIB-3-FIBDISABLE: Fatal error, slot 8: IPC failure
%GRP-3-COREDUMP: Core dump incident on slot 8, error: Fabric ping failure (seq:122)
%LCINFO-3-CRASH: Line card in slot 8 crashed
%MBUS-6-FAILEDPEER: Failed peer RP in slot 8 reason peer: oth GRP req core
%LINK-5-CHANGED: Interface POS8/2, changed state to administratively down
There is no workaround.
•
CSCdu48907
On 3-Port Gigabit Ethernet line cards, the Gigabit Ethernet port may store the MAC address entry
for the hosts even though source MAC accounting is disabled. The port should only store the
following MAC addresses when source MAC accounting:
– the interface address of the port
– the broadcast address
– Hot Standby Router Protocol (HSRP) addresses
There is no workaround.
•
CSCdu48926
Cisco Express Forwarding (CEF) becomes disabled on a Generic Routing Encapsulation (GRE)
tunnel interface when a key is configured with the tunnel key key-number interface configuration
command. The tunnel interface switches to the next available switching mechanism, which is
process switching (fast switching has no support for GRE tunnel options).
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2248
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S
Workaround: To reenable CEF or fast switching on the tunnel interface, remove the tunnel key. This
workaround cannot be used if a tunnel key is required with CEF switching on the GRE tunnel.
•
CSCdu49594
If a Cisco router has the same IP address configured on two interfaces where one of the interfaces
is in shutdown state and is configured to run a Tag Distribution Protocol (TDP)/Label Distribution
Protocol (LDP) session, then the router’s peer may have Tag Forwarding Information Base (TFIB)
entries that are untagged.
Workaround: Remove the duplicate IP address from the shutdown interface.
•
CSCdu50386
If a single-port OC-48 line card is configured as the tunnel server card while installed in slot 0 of a
Cisco 12000 series Internet router, the output of the showing running-configuration command
does not show the “hw-module slot0 mode server” line. In this situation, if the router is reloaded,
the line card is not configured to act as the tunnel server and all Universal Transport Interface (UTI)
tunnels that are present on the router fail.
Workaround: Manually configure the line card to act as the sever by entering the hw-module slot0
mode server command.
•
CSCdu50884
A Cisco 7200, 7500/RSP or 12000 series router may reload when the dir slot0: EXEC command is
entered with too many characters between “slot” and “:”. The proper command syntax should be
used. There is no workaround.
•
CSCdu52687
A Cisco router may reload when a subinterface is being configured with the mpls label protocol
ldp command when the interface is tag-switching enabled and running with the mpls label protocol
tdp command enabled. This condition occurs when the tag-switching ip command is enabled on the
router with the default mpls label protocol tdp command enabled on the interfaces.
Workaround: Configure the no tag-switching ip command globally on the router before changing
the tag switching protocol between Label Distribution Protocol (LDP) and Tag Distribution Protocol
(TDP) in either direction.
•
CSCdu53060
The ATM permanent virtual circuit (PVC) inverse Address Resolution Protocol (ARP) may not
function as expected. Inverse ARP requests are not replied to when the interface is a point-to-point
connection.
Workaround: Use a point-to-multipoint connection if ATM inverse ARP is used, or use the protocol
statement under the PVC configuration mode.
•
CSCdu53584
The switching path changes from distributed Cisco Express Forwarding (dCEF) to Cisco Express
Forwarding (CEF) after 40 online insertion and removal (OIR) events. This condition affects quality
of services (QoS) functionality and the performance of the router, which requires a dCEF path.
There is no workaround.
•
CSCdu54878
On Engine 2 line cards on a Cisco 12000 series Internet router, the correct feature microcode may
not be loaded when two PSA access control lists (ACLs) are configured and then removed.
Workaround: Perform a microcode reload on the line card.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2249
Resolved Caveats—Cisco IOS Release 12.0(19)S
•
CSCdu56205
A Cisco 12000 series Internet router that is running Multiprotocol Label Switching (MPLS) with
Engine 2 line cards may experience some packets not getting passed through the router. This
condition occurs if the following are all true:
– An Engine 2 line card is the Ingress card.
– The packets are coming into the Engine 2 line card untagged and having a Label pushed onto
them.
– Some event has occurred which caused the Cisco Express Forwarding (CEF) table to change the
label of the route.
– The route is “double recursive.” See the following example:
show ip route x.x.x.x <---- Learned via BGP, has next hop of y.y.y.y
show ip route y.y.y.y <---- Learned via BGP, has next hop of z.z.z.z
show ip route z.z.z.z <---- Learned via IGP (ISIS, OSPF, EIGRP, etc.).
You will experience the problem only with the x.x.x.x route.
Workaround: Change the Border Gateway Protocol (BGP) next-hop of the x.x.x.x route with the
neighbor a.a.a.a. next-hop-self router configuration command on the router learning the external
BGP (eBGP) routes. This command would be used on all your iBGP neighbors.
•
CSCdu57137
If the write erase command is issued on a Cisco 7200 series router, the configuration register may
get set to 0x0, which will cause the router to wait at ROMmon at the next boot.
Workaround: Change the configuration register to the desired setting (usually 0x2102) to avoid this
situation by performing one of the following actions.
– If you are at the ROMmon, enter the confreg 0x2102 command.
– If you are still in Cisco IOS software, enter the config-register 0x2102 global configuration
command.
•
CSCdu58607
On a Cisco 7500 series router that is running Cisco IOS Release 12.0(13)S2 with no service
single-slot-reload-enable configured and distributed Cisco Express Forwarding (dCEF) enabled,
the online insertion and removal (OIR) of a Versatile Interface Processor (VIP) can cause the
Multilink interfaces in other slots to go down, and the following error appears on the console:
%OIR-6-REMCARD: Card
%RSP-3-NOIDB: bad vc
%RSP-3-NOIDB: bad vc
%RSP-3-NOIDB: bad vc
%RSP-3-NOIDB: bad vc
removed
3 on E1
3 on E1
3 on E1
3 on E1
from slot 4, interfaces disabled
9/1/0
9/1/1
9/1/2
9/1/3
After the message, the Multilink interface will go down together with the physical interfaces it is
using, and the following messages are displayed:
%LINK-3-UPDOWN: Interface
%LINEPROTO-5-UPDOWN: Line
%LINEPROTO-5-UPDOWN: Line
%LINEPROTO-5-UPDOWN: Line
%LINEPROTO-5-UPDOWN: Line
Multilink4, changed state to down
protocol on Interface Serial9/1/0:0, changed state to down
protocol on Interface Serial9/1/1:0, changed state to down
protocol on Interface Serial9/1/2:0, changed state to down
protocol on Interface Serial9/1/3:0, changed state to down
After these messages, the router usually recovers, and all interfaces go up again. This situation does
not occur when CEF is running instead of dCEF.
Workaround: Disable the keepalives on the member interfaces of the Multilink interface.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2250
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(19)S
•
CSCdu58992
When large or jumbo frames are received on an Ethernet, Fast Ethernet or Gigabit Ethernet interface
that uses the i82543 Medium Access Controller, the MAC will continue to write descriptors back
past the end of the descriptor ring, which causes memory corruption. There is no workaround.
•
CSCdu60153
A Cisco 12000 series Internet router with a large access control list (approximately 10,000 lines)
applied to an OC-48 Packet-over-SONET (POS) line card may reload if the access control list is
removed from the configuration by the no access-list access-list-number global configuration
command. There is no workaround.
•
CSCdu64069
IP coloring (IP marking) may fail to mark a packet if IP coloring is configured on an interface with
an input Access Control List (ACL), or if any interface on a Cisco 12000 Internet Router has an
output that has an output ACL. ACL will still function as normal. This condition only occurs if IP
coloring is configured on an E2 line card. There is no workaround.
•
CSCdu64444
Inter-Switch Link (ISL) packets may not be recognized by Cisco Express Forwarding (CEF)
switching. This situation occurs on PA-2FE-TX, PA-2FE-FX, C7200-I/O-2FE/E, C7200-I/O-GE+E,
and Cisco 7410 native Gigabit Ethernet ports. In this situation, all ISL packets are process-switched,
and Committed Access Rate (CAR) does not function properly.
Workaround: Use port adapters other than the ones mentioned in this caveat.
•
CSCdu65048
After debug sanity is enabled on Cisco routers that support particles, the router may experience a
memory leak and reload. The amount of time that it takes for the memory leak to surface and the
reload to occur varies. There is no workaround.
•
CSCdu65115
A Cisco router that is running Cisco IOS Release 12.0(17)S may experience 100-percent CPU
utilization on the Route Processor (RP) that is caused by E4-to-E4 Multiprotocol Label Switching
(MPLS) fragmentation. Several “%IPC-3-NOBUFF” messages are observed. There is no
workaround.
•
CSCdu67202
A Cisco 12000 Internet router that is running Cisco IOS Release 12.0(18)S may reload when an IP
routing policy is configured on any interface.
Workaround: Avoid configuring policy routing on any interface.
•
CSCdu67408
An Engine 4 line card on a Cisco 12000 Internet router that is running Cisco IOS Release 12.0(15)S
may stop working and experience a route processor (RP)-forced reload if one of the interfaces is
configured to run IP multicast and if the no ip mroute-cache distributed command is configured.
Workaround: Configure the ip multicast-routing distributed global configuration command on
Engine 4 line cards that are running multicast.
•
CSCdu68954
If no cos gsr tx is configured on a Cisco 12000 series Internet router, ingress Engine 4 line cards
may forward traffic out the incorrect interface. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2251
Resolved Caveats—Cisco IOS Release 12.0(19)S
•
CSCdu69292
A Gigabit Ethernet port adapter (PA-GE) on a Cisco 7206VXR that is running Cisco IOS
Release 12.0(17)ST may stop forwarding traffic after logging the receipt of giant frames or packets.
In this situation, the interface locks up and continues to increment the overrun counter that is
displayed when the show interface EXEC command is entered.
Workaround: Enter the shut command followed by the no shut command on the interface.
•
CSCdu70232
When the fiber is removed from the interface on a Cisco 7500 series router with an Enhanced Gigabit
Ethernet Interface Processor (GEIP+), the interface stays in an up/up state even through the output
of the show controllers command on the Versatile Interface Processor (VIP) shows an up/down
state. There is no workaround.
•
CSCdu74951
A Cisco 7500 with a RSP4 Route Switch Processor may reload with a bus error if you attempt to
enter the no service-policy output name subinterface ATM configuration command via Telnet.
Workaround: Enter the command from the console port.
•
CSCdu75397
An Engine 4 line card in Cisco 12000 series Internet router that is running Cisco IOS
Release 12.0(18.3)S may display error messages similar to the following and forward duplicate
multicast packets out of the same interface:
SLOT 0:
%TX192-3-MGID: no hw_mdb in mcast table hw_mdb=1 26, port=3 -Traceback= 40323F0C
4032411C 40687FC4 40687E28 40688214 40681D64 40684274 40684360 40683AC8 400A1D4C
400A1D38
There is no workaround.
•
CSCdu79417
Some “!!!” characters are displayed when a running configuration is saved. There is no workaround.
•
CSCdu84031
A Cisco 7500 series router that is hosting an ATM PA-A1 port adapter in any Versatile Interface
Processor (VIP) may start losing Rx-side buffers when high traffic is moving through the router. The
high traffic also causes an increasing “rx-freeze” counter in the show controllers atm privileged
EXEC command log. There is no workaround.
•
CSCdu86320
A Cisco 7200 series router may experience a flapping line protocol on a full-duplex Fast Ethernet
interface when Hot-Standby Router Protocol (HSRP) is configured with a nondefault configuration
and the Ethernet cable is removed.
Workaround: Enter the keepalive 3 interface configuration command on the affected interface, use
the burnt-in address, or ensure that the hello and hold times are at least 3 and 10 seconds
respectively.
•
CSCdu87539
When some permanent virtual circuits (PVCs) are created on ATM interfaces with Operation,
Administration, and Maintenance (OAM) enabled, the PVC does not move to the down state when
OAM loopback fails.
Workaround: Use newer PVC commands.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2252
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(18)S7
•
CSCdv02546
Unicast traffic with a Multicast address in the source should be dropped by E2 cards. There is no
workaround.
•
CSCuk25747
A small memory leak (144-288 bytes) may occur each time a Hot Standby Routing Protocol (HSRP)
group becomes active.
Workaround: Configure the standby use-bia interface configuration command.
Wide-Area Networking
•
CSCdt90224
A Cisco 7500 series router with a second-generation Versatile Interface Processor (VIP2) may
experience a condition where Cisco Express Forwarding (CEF) is disabled on cards residing in
neighboring slots if an online insertion and removal (OIR) is performed on the VIP. There is no
workaround.
•
CSCdu45569
After a Cisco 7513 router has been upgraded from Cisco IOS Release 11.1(30)CC to Cisco IOS
Release 12.0(16)S1, dialup may stop functioning. This situation has been observed with two
Cisco 7513 routers where dialup is accomplished through the pri-group controller configuration
command on a PA-MC-E3 port adapter. In this situation, there were no changes to the configuration,
and all dial-in and dial-out attempts fail with error messages at the call setup. This situation has not
been observed on other software/hardware combinations. There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(18)S7
Cisco IOS Release 12.0(18)S7 is a rebuild of Cisco IOS Release 12.0(18)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(18)S7. This section describes only severity 1 and 2
caveats.
•
CSCea02355
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2253
Resolved Caveats—Cisco IOS Release 12.0(18)S6
Resolved Caveats—Cisco IOS Release 12.0(18)S6
Cisco IOS Release 12.0(18)S6 is a rebuild of Cisco IOS Release 12.0(18)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(18)S6. This section describes only severity 1 and 2
caveats.
•
CSCds30121
A Cisco 12000 series Internet router with approximately 100 switched virtual circuits (SVCs) may
stop sending data randomly across any SVC. This situation is accompanied by “encapsulation
error2” failure messages.
Workaround: Remove the SVC from the map group, and add it back again.
•
CSCdw06558
A Cisco 12000 series Internet router with about 500 or more tunnels configured may reload if you
enter the no mpls traffic-eng tunnels command. There is no workaround.
•
CSCdw09409
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(17)S,
Release 12.0(18)S, Release 12.0(19)S, or a rebuilt release that is based on one of these three
releases, and that is configured with one or more 3-port Gigabit Ethernet line cards may show the
following two symptoms:
– The router may become totally inoperable and no longer forward traffic or respond to console
commands. Restoring the affected router to normal operation requires either a manual power
cycling or a break- in and soft reset using the console break sequence.
–
The router may reload because of a software-forced reload. This occurs because the router goes
into an infinite look, and the watchdog timer starts and reloads the router.
This situation is caused by a very rare event in the Address Resolution Protocol (ARP) code that
may cause data structure corruption, which results in system instability. Because of the rare nature
of this event, the affected router may experience intermittent hangs at intervals of hours up to several
months. There is no workaround. (Upgrade a susceptible router to a Cisco IOS software release in
which this caveat has been resolved.)
Note
•
This caveat does not apply to a router that is configured with one or more single-port Gigabit
Ethernet line cards.
CSCdw63039
During low memory conditions, it is possible for the peer-group leader to not receive all routes.
There is not a workaround to prevent this problem but if this problem occurs, the clear ip bgp x.x.x.x
soft out command can be used to force BGP to resend updates to x.x.x.x.
•
CSCdw63152
The following error messages may occur with Engine 2 OC-48 line cards after Multiprotocol Label
Switching (MPLS) is enabled:
%ALIGN-3-SPURIOUS: Spurious memory access made at 0x402B25A0 reading 0x10
%ALIGN-3-TRACE: -Traceback= 402B25A0 402B27E0 402B2AE0 402B3BBC 4063490C 40634FA0
4063B364 4060A854
There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2254
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(18)S5
•
CSCdw63200
If you reload a 4-port OC-3 line card on a Cisco 12000 series Internet router, a burst of cyclic
redundancy check (CRC) errors may be received at the other end of the OC-3 link. If the remote
router is software based (such as a Cisco 7200 series router), this burst of CRC errors may cause
high CPU utilization.
Workaround: Shut down the interface at the remote router before you reload the 4-port OC-3 line
card.
•
CSCdw77076
IP packets that are received on an Engine 2 line card and destinated to an interface that is configured
for tag switching or Multiprotocol Label Switching (MPLS) will be punted to line card CPU for
switching instead of being switched in hardware by the PSA, even if the outgoing packet is not
tagged. This condition affects the performance of the incoming linecard to switch packets. There is
no workaround.
Resolved Caveats—Cisco IOS Release 12.0(18)S5
Cisco IOS Release 12.0(18)S5 is a rebuild of Cisco IOS Release 12.0(18)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(18)S5. This section describes only severity 1 and 2
caveats.
•
CSCdv70295
If an Engine-4 line card is configured as the ingress point for a Multiprotocol Label Switching
(MPLS) Traffic Engineering (TE) tunnel, on reroute, the line card that is configured as the egress
point may reload. There is no workaround.
•
CSCdw47388
If you configure an output access control list (ACL) with 448 lines on a Cisco 12000 series Internet
router, and the ingress line card for the traffic that needs to be filtered is an 8-port or 16-port OC-3
Packet-over-SONET (POS) line card, the output ACL will not filter traffic.
Workaround: Do not configure an ACL with more than 128 lines on any interface of a Cisco 12000
series Internet router that is configured with an 8-port or 16-port OC-3 POS line card.
•
CSCdw65903
An error can occur with management protocol processing. Please use the following URL for further
information:
http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdw65903
Resolved Caveats—Cisco IOS Release 12.0(18)S3
Cisco IOS Release 12.0(18)S3 is a rebuild of Cisco IOS Release 12.0(18)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(18)S3. This section describes only severity 1 and 2
caveats.
•
CSCds13054
A memory leak occurs when Simple Network Management Protocol (SNMP) requests are done on
the doc3StatsEtherChipset object in the dot3StatsTable. This condition is platform independent.
Workaround: Do not perform SNMP get or getnext operations on the dot3StatsTable.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2255
Resolved Caveats—Cisco IOS Release 12.0(18)S3
•
CSCdt96253
Three different Cisco product lines are susceptible to multiple vulnerabilities in the Secure Shell
(SSH) protocol. These issues are inherent to the SSH protocol version 1.5, which is implemented in
several Cisco product lines.
By exploiting the weakness in the SSH protocol, it is possible to insert an arbitrary command into
an established SSH session, collect information that may help in brute force key recovery, or brute
force a session key.
The affected product lines are as follows:
– All devices, including routers and switches, running Cisco IOS software supporting SSH
– Catalyst 6000 switches running CatOS
– Cisco PIX Firewall
No other Cisco products are vulnerable.
It is possible to mitigate this vulnerability by preventing, or having a control over, interception of
SSH traffic. see the advisory at the following URL:
http://www.cisco.com/warp/public/707/SSH-multiple-pub.html
•
CSCdu29618
Under certain conditions on a Cisco 12000 series Internet router, Engine 4 line cards may update
Cisco Express Forwarding (CEF) entries slower than Engine 2 line cards do. There is no
workaround.
•
CSCdu87946
On a Cisco 12000 series Internet router that has tag switching configured, an OC-192 line card may
reload when the network mask is changed from /30 to /24. This condition has been observed in
Cisco IOS Release 12.0(17)S, 12.0(18)S, and 12.0(19)S. There is no workaround.
•
CSCdv33612
A Cisco 12000 series Internet router may exhibit any of the following symptoms:
– Packets that exit the router have a corrupted or invalid MAC header. A common example of this
situation occurs when a single-hop Traffic Engineering (TE) tunnel is configured out of a given
interface. In this case, IP packets that exit other interfaces on the same line card will have a
Multiprotocol Label Switching (MPLS) process identification number (PID) field in the
High-Level Data Link Control (HDLC)/PPP header.
– Traffic gets dropped in the incoming line card. This situation presents itself in the case of
multicast traffic for which no matching (S,G) entry is found in the line card. In this situation,
traffic gets sent to the Route Processor or dropped.
There might be other symptoms that have not been observed yet. The easiest way to determine the
existence of this error condition is to enter the show gsr encapsulation command; if the output of
the Output Info record is empty even though there are point-to-point interfaces in the system that
are up and running, you have encountered this error condition.
Workaround: For the cases with invalid MAC headers due to of a single-hop TE tunnel that is
present, bring down a physical interface that has no tunnels on it and that is on the same line card,
wait a few seconds, and bring it back up. If the TE tunnel goes down and comes back up, the router
will experience the same situation, and a physical interface that is not being used by the tunnel will
need to be flapped again. For the cases where traffic is not sent out at all, there is no known
workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2256
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(18)S2
•
CSCdv42325
On a Cisco 12000 series Internet router, switching from load balancing to a fast adjacency or from
a fast adjacency to load balancing may result in traffic loss. There is no workaround.
•
CSCdv46898
If Border Gateway Protocol (BGP) is configured to send IPv4 unicast and multicast routes to a peer
group, there will be a 6-minute delay before any IPv4 unicast updates are sent. This situation does
not occur with nonpeer groups and does not exist if only unicast or multicast routes are being sent.
This situation occurs only when both unicast and multicast are sent to a peer group. There is no
workaround.
•
CSCuk26683
If IP is disabled (by entering the no ip address interface configuration command) on an interface
while Cisco Express Forwarding (CEF) is globally disabled and then CEF is enabled, the interface
may show inconsistencies when the show cef interface EXEC command is entered. In the case of
distributed platforms, this sequence could result in inconsistencies between the line card and the
Route Processor in which the network prefixes and the host prefix show up in the CEF table when
IP is disabled on the interface. The sequence to reproduce this situation is as follows:
ip cef distributed
!
interface lo 2
ip address 1.0.0.1 255.255.255.0
!
no ip cef
interface lo 2
no ip address
shut
!
ip cef distributed
Workaround: Enable IP on the interface while CEF is enabled, and then disable the interface.
Resolved Caveats—Cisco IOS Release 12.0(18)S2
Cisco IOS Release 12.0(18)S2 is a rebuild of Cisco IOS Release 12.0(18)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(18)S2. This section describes only severity 1 and 2
caveats.
•
CSCdu64069
IP coloring (IP marking) may fail to mark a packet if IP coloring is configured on an interface with
an input Access Control List (ACL) or if any interface on a Cisco 12000 Internet router has an output
that has an output ACL. ACLs will still function as normal. This condition occurs only if IP coloring
is configured on an E2 line card. There is no workaround.
•
CSCdu81007
The Cisco Express Forwarding (CEF) table is not updated properly when the IP address of an
interface changes. The new IP address is added to the CEF table but the old one is not removed. If
subinterfaces are used, the old ones remain in the CEF table even after the subinterfaces are
removed.
Workaround: When you issue the shut command on the subinterface before changing the address,
the IP address is correctly deleted from the CEF tables.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2257
Resolved Caveats—Cisco IOS Release 12.0(18)S1
•
CSCdv01853
A Cisco router that is running Cisco IOS Release 12.2(3.5) may experience a software-forced reload
at ip_arp_refresh_adj after the no shutdown command is entered on a multipoint subinterface in
LAN Emulation (LANE) testing. There is no workaround.
•
CSCdv05120
A line card on a Cisco router that is running distributed Cisco Express Forwarding (dCEF) with
Cisco IOS Release 12.0(19)S or later may be missing interfaces and interface-related
configurations, such as access lists, after a boot or after enabling dCEF. There is no workaround.
•
CSCdv47664
The online insertion and removal (OIR) of a Versatile Interface Processor (VIP) in a Cisco 7500
series router may cause Cisco Express Forwarding (CEF) to become disabled on VIP cards in other
slots.
Workaround: Enter the microcode reload global configuration command after a failed OIR.
•
CSCuk27669
Entering the show ip cef EXEC command may cause a Cisco router to reload if load-shared paths
change while the command executes. There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(18)S1
Cisco IOS Release 12.0(18)S1 is a rebuild of Cisco IOS Release 12.0(18)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(18)S1. This section describes only severity 1 and 2
caveats.
•
CSCds20358
Under certain circumstances, numerous “ignore” messages might be displayed on a PA-A1 port
adapter interface. The output of the show controllers cbus command and the show vip accu
command are clean.
Workaround: Enter the shutdown command followed by the no shutdown command.
•
CSCds41275
Upgrading a Cisco router to Cisco IOS Release 12.0(12.5)S may cause the “OSPF router” process
to cause 99-percent CPU utilization and low memory problems.
Possible workaround: Remove and reconfigure Open Shortest Path First (OSPF).
•
CSCdt33317
On a Cisco 7500/RSP series router, packets that are received on a Spatial Reuse Protocol (SRP)
interface and switched on the Route Switch Processor (RSP) will fail to get Cisco Express
Forwarding (CEF) or fast switched going into a tunnel interface and get dropped. This situation only
occurs on the Cisco 7500/RSP routers with SRP interfaces.
Workaround: Disable CEF and fast switching on the tunnel interface.
•
CSCdt63459
On a Cisco 7513 router that has a Route Switch Processor 4 (RSP4) that is configured with 128 MB
DRAM and is carrying 11,000 routes, entering the clear cef linecard EXEC command may cause
all available memory to be consumed.
Workaround: Enter the clear ip bgp {*} EXEC command before entering the clear ip cef EXEC
command.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2258
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(18)S1
•
CSCdt93586
The Open Shortest Path First (OSPF) database may not create the necessary entries to resubmit an
OSPF interarea route.
Workaround: Clear the OSPF process.
•
CSCdu05173
A Cisco 7500 series router may use invalid Cisco Express Forwarding (CEF) entries on Versatile
Interface Processors (VIPs) to switch traffic when distributed Cisco Express Forwarding (dCEF) is
disabled. The CEF entry on the Route Switch Processor (RSP) is valid while the entry on the VIP is
invalid.
Workaround: Reboot the VIP and use the clear cef line slot command to clear the lines for each VIP
until all the VIPs become visibly synchronized in the output when the show cef linecard command
is entered.
•
CSCdu15875
A Cisco 7500 series router, with a PA-MC-E1 or PA-MC-T1 port adapter with 128 channel-groups
configured, may experience repeated Cbus-complex reloads when an online insertion and removal
(OIR) operation is performed. There is no workaround.
•
CSCdu16602
A Cisco router may reload when the show ip mroute group-address source-address EXEC
command is entered.
Workaround: Avoid using the show ip mroute group-address source-address EXEC command
when there are multicast routes that are rapidly changing.
•
CSCdu27583
A 3-port Gigabit Ethernet line card may reload with a bus error exception. There is no workaround.
•
CSCdu28251
When a Cisco router that is running Cisco IOS software based on Cisco IOS Release 12.0(15)S2 is
upgraded to Cisco IOS Release 12.0(16.6)S3.0516, some line cards may experience problems
booting. The following error messages may be displayed:
%MBUS-0-DOWNREV: MBUS agent in slot 1 running from ROM
%MBUS-2-DNLDFAIL: MBUS Agent RAM download to slot 1
After the line cards have not been up for 6 minutes, the line card may end up in an FIB disabled state
(dCEF not running). The following error message may be displayed:
%FIB-3-FIBDISABLE: Fatal error, slot 7: No window message, LC to RP IPC is
non-operational
Workaround: It has been observed that a microcode reload or complete software reload may resolve
this problem.
•
CSCdu35480
A Cisco 7500 series router might reload with a bus error when sending an Intermediate
System-to-Intermediate System (IS-IS) complete sequence number PDU (CSNP) packet over an
Ethernet interface. There is no workaround.
•
CSCdu47902
Inserting a large number of Border Gateway Protocol (BGP) routes may cause memory to become
fragmented and result in distributed Cisco Express Forwarding (dCEF) becoming disabled because
of a low memory condition. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2259
Resolved Caveats—Cisco IOS Release 12.0(18)S1
•
CSCdu50927
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(17)S might generate the
following error message:
%GRP-3-ENCAP: Failure to allocate encap table entry, exceeded max number of entries,
slot 3 (info 0x8000)
-Traceback= 602555E0 60255AC4 602560E0 600F783C 600F7914 600F71C4 600F7288 605690C4
6056C0DC 60569C74 605697A0 603544B4 603537A0 6035397C 60353AF0 6019254C
There is no workaround.
•
CSCdu58406
Entering the no ip source-route global configuration command on a Gigabit Router Processor
(GRP) does not stop the Cisco 12000 series Internet router from routing packets containing
source-route information. There is no workaround.
•
CSCdu65825
Under rare conditions, the route processor (RP) in a Cisco 12000 series Internet router that is
running Cisco IOS Release 12.0(15)S3 may reload if a line card is attached. There is no workaround.
•
CSCdu66206
Multicast Output interfaces (OIFs) are missing from certain groups causing multicast traffic to be
affected. This condition normally occurs during startup because of the varying speeds in which the
cards are turned on.
Workaround: Reload the microcode on the card that contains the missing OIFs.
Note
•
Reloading the microcode may lead to issues that are related to caveat CSCuk22826.
CSCdu72336
Multicast Distributed Fast Switching (MDFS) for IP Multicast on a Cisco 12000 series Internet
router may fail to add a particular interface to the OIF list of certain multicast static routes (mroutes)
on a linecard. If that linecard is the Reverse Path Forwarding (RPF) interface for that mroute, this
situation will result in forwarding to that OIF interface to fail.
Diagnosis: If a Cisco 12000 Internet router is not correctly forwarding IP multicast traffic out a
particular interface but the output of the show ip mroute EXEC command shows that interface in
the OIF list of that route, verify that the interface also shows up in the OIF list on the linecard that
has the incoming interface of the route. Enter the attach slot-number privileged EXEC command,
where slot-number is the number of the line card and then enter the show ip mds forwarding EXEC
command to determine the actual MDFS forwarding state of the mroute. If the outgoing interface in
question does not show “ip” in this output then this caveat applies.
Workaround: Disable MDFS on the incoming interface by configuring no ip mroute-cache on the
interface. Do not try to use this workaround if more than a very low amount of multicast traffic is
arriving on that interface or else you will compromise the stability of the router because the
workaround will make the packets switched through the Gigabit Route Processor instead of the
switching fabric.
•
CSCdu72555
Running Sampled NetFlow to collect the traffic from a 3-port Gigabit Ethernet line card on a Cisco
12016 Internet router may only collect traffic on the first Gigabit interface. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(18)S
•
CSCdu74552
Field diagnostic tests might fail on a slave route processor (RP) with 512 MB. The following events
have been observed when this failure occurs:
– Field diagnostic tests do not run and the “Timeout waiting for UUT...” error message is
displayed.
– RP diagnostic tests pass without testing the memory.
There is no workaround.
•
CSCdu82359
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0 (18)S may reload with
a bus error when the ip multicast boundry command is entered. There is no workaround.
•
CSCdu83386
The ip helper-address address interface configuration command does not function properly when
configured on a Cisco 12000 Internet Router. There is no workaround.
•
CSCdv10979
Shutting down and restarting a Clock Scheduler Card on a Cisco 12000 series Internet router that is
running Cisco IOS Release 12.0(17)S or 12.0(17)ST with the hw-module command might cause the
router to appear to pause indefinitely.
•
CSCdv11376
Multicast packets that are sent from an Engine 2 line card to a DPT 48 node in dense mode might
not be switched for some groups. This condition occurs because of inconsistencies in the (*,G) and
(S,G) tables on the Engine 2 line card. For some groups, the DPT48 node is in the (*,G) table and
not in the (S,G) table. There is no workaround.
•
CSCdv14967
OC-3 and SRP-12 line cards might show incorrect traffic output statistics when traffic travels
through an OC-192 interface and exits through a non-OC-192 interface.
Correct traffic output statistics are displayed when the OC-3 line card is configured with Committed
Access Rate (CAR).
Workaround: Configure the OC-3 line card with CAR.
Resolved Caveats—Cisco IOS Release 12.0(18)S
All the caveats listed in this section are resolved in Cisco IOS Release 12.0(18)S. This section describes
only severity 1 and 2 caveats.
Basic System Services
•
CSCdu14002
An ICMP response time value rounds off to zero when the response time is less than 1millisecond.
There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(18)S
Interfaces and Bridging
•
CSCdt41215
A Cisco 7200 series router or Cisco 7500 series router that is running Cisco IOS Release 12.0(1)S3
with back-to-back ATM OC-3 connections may experience intermittent ATM link failures because
OAM cells that maintain link connectivity are not sent.
Workaround: The link can be restored by entering the clear interface interface-number command.
•
CSCdt88710
Enabling distributed Cisco Express Forwarding (dCEF) on a Cisco 7500 series router that is running
Cisco IOS Release 12.0 ST with a Versatile Interface Processor 4-80 (VIP 4-80) line card and PA-A3
OC-12 port adapter with Virtual Private Network (VPN) routing and forwarding (VRF) configured
on the port adapter will prevent traffic from being forwarded. This condition does not occur with a
PA-A3 OC-3 line card or PA-A3 OC-12 port adapter when VRF is not enabled. There is no
workaround.
•
CSCdt90054
A Cisco 7500/RSP series router that is running Cisco IOS Release 12.0(15)S1 and that has a
Versatile Interface Processor 2-50 (VIP2-50) and an ATM-PA-A3 port adapter might display the
following error message on the Route Switch Processor (RSP) console if the VIP is running at
99 percent utilization:
%ATM-3-FAILCREATEVC: ATM failed to create VC(VCD=23, VPI=0, VCI=96) on Interface
ATM4/1/0, (Cause of the failure: Failed to have the driver to accept the VC)
Possible Workarounds:
– Disable distributed Cisco Express Forwarding (dCEF).
– Enter the shutdown interface configuration command followed by the no shutdown interface
configuration command on the ATM interface.
IP Routing Protocols
•
CSCdt48480
A filter list may deny a path incorrectly.
Workaround: Restart the Border Gateway Protocol (BGP) process.
•
CSCdt71785
A Cisco router that is redistributing routes into the Open Shortest Path First (OSPF) protocol may
experience periods of high CPU utilization, and the console may become temporarily locked when
the routing table becomes too large. There is no workaround.
•
CSCdt88930
In rare cases, the Open Shortest Path First (OSPF) protocol may fail to install a default route. The
route will automatically be installed during the next shortest path first (SPF) calculation.
Workaround: Add a static default route with a higher administrative distance than OSPF, and
redistribute the static default route through OSPF. Or, add a fake loopback route to OSPF net
statements, and flap the fake loopback route.
•
CSCdu04678
A Cisco router may reload after the show ip igmp groups command is entered if the command is
paused for long periods of time at the “More” prompt and restarted later. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2262
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Resolved Caveats—Cisco IOS Release 12.0(18)S
•
CSCdu12698
A router that has the ip multicast boundary access-list-number interface configuration command
configured on an interface may reload when the access list is defined. There is no workaround.
•
CSCdu26591
When Border Gateway Protocol (BGP) routing is repeatedly enabled and disabled by entering the
router bgp as-number and no router bgp as-number commands, the system may lose memory. This
situation may result in memory corruption, and in some cases, the system may pause indefinitely.
Workaround: Do not toggle BGP routing dynamically. Once BGP routing is disabled, save the
configuration and reload the system.
ISO CLNS
•
CSCdt97590
If a Layer 2-only interface goes down on a Cisco router that is running the Intermediate
System-to-Intermediate System (IS-IS) protocol, and if that router is using route leaking to
redistribute the network on that interface into Layer 1, the network might not be removed from the
Layer 1 link-state packet (LSP) on that router.
Workaround: Enter the clear ip route {*} EXEC command. The LSP should be properly
regenerated.
•
CSCdu16728
A Cisco router that is running the Intermediate System-to-Intermediate System (IS-IS) protocol may
reload. This condition may occur with all software images. There is no workaround.
Miscellaneous
•
CSCdm65973
A PA-A3 may report a higher number than expected CRC errors on an ATM interface for one or
more virtual circuits (VCs). The root cause of the problem is that the affected versions of Cisco IOS
software are counting packet bytes that were received with CRC errors, rather than counting errored
packets. This condition makes the CRC error counter many more times higher than the actual value.
The same behavior also occurs with the aborts and giants. Note that the firmware and not Cisco IOS
detects the giants.
Workaround: Troubleshoot the cause of the CRC errors. see the CRC Troubleshooting Guide for
ATM Interfaces on Cisco.com for assistance.
•
CSCdr55864
The boot flash file system may be corrupted after a system reload. This situation occurs only after
a reload file is written to boot flash. There is no workaround.
•
CSCds22213
A Cisco 12000 series router with a Gigabit Ethernet/Fast Ethernet output interface may experience
a tag fragmentation problem if the maximum transmission unit (MTU) size on the input interface is
larger than the MTU on the output interface. This problem does not occur when the MTU sizes are
the same on both the input and the output interfaces. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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2263
Resolved Caveats—Cisco IOS Release 12.0(18)S
•
CSCdt01089
The following error message may be displayed during a Route Processor (RP) failover:
SEC 1:00:25:34: %IPCGRP-3-SEATERR: Can not find card by seat id (131178)
-Traceback= 601BCB0C 60299460 6017562C 60175618 00:25:34:
%IPCGRP-3-SEATERR: Can not find card by seat id (5)
-Traceback= 601BCB0C 60299460 601756nality of the router.
There is no workaround.
•
CSCdt38708
A 1500-byte IP packet with three Multiprotocol Label Switching (MPLS) labels cannot be received
on a Fast Ethernet or Gigabit Ethernet interface because the packet will be counted as a giant and
dropped. There is no workaround.
•
CSCdt44794
The output of the show atm pvc command does not correlate with packet output drop values from
the show interface command when permanent virtual circuit (PVC) queueing is configured on an
ATM interface.
Workaround: Enter the show queueing interface atm command to display PVC drops in the
matching Layer 3 queue.
•
CSCdt51551
When a provider edge (PE) Cisco 12000 series Internet router is running Cisco IOS
Release 12.0(11)ST1 and a customer edge Cisco 12000 series Internet router is running Cisco IOS
Release 12.0(14)S, Frame Relay encapsulation does not work after the configuration of
multiprotocol BGP (mBGP). The following occurs:
– You can configure Frame Relay encapsulation.
– You can create the permanent virtual circuit (PVC).
– The PVCs stay in the Inactive state.
The PVC is active before the configuration of mBGP. If the PVC is configured in address family
Virtual Private Network version4 (VPNv4) configuration mode, the PVC passes to inactive status.
There is no workaround.
•
CSCdt54847
The Cisco Express Forwarding (CEF) table for a Cisco 12000 series Internet router line card might
not synchronize with the Gigabit Route Processor (GRP) on a Cisco 12000 series Internet router that
is running Cisco IOS Release 12.0(13)S2.
This situation has been observed when a Packet-over-SONET (POS) line card did not have a /32
receive adjacency for a Gigabit Ethernet module on the same Cisco 12000 series Internet router. The
output of the show cef interface gigabit 9/0 command revealed that IP processing was disabled on
Gigabit interface 9/0 and that there were no /32 receive entries for the addresses assigned to that
interface (primary or secondary). No problems were detected on the GRP, and there have been no
records of interfaces being reset.
Workaround: Clear the IP CEF table.
•
CSCdt64782
Alarm warnings have occurred on a Cisco 12012 Internet router that is running Cisco IOS
Release 12.0(15.6)S. These warnings have been observed on the PSU and blower units, and on the
critical, major, and minor LEDs on the alarm card. The alarm warnings clear after the Route
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(18)S
Processor has completed booting (30 seconds to 5 minutes). Normal operations continue after the
alarm warnings have cleared. These warnings have not been observed on the Cisco 12008 or 12016
routers. There is no workaround.
•
CSCdt70875
An SRAM hardware failure on an Engine 2 OC-48 linecard on a Cisco 12000 series Internet router
may cause the line card to reload with the following error message:
%LCPOS-3-SOP: RX:UnexpectedEop. Source=0x20 (Framer), halt_minor0=0x40
The error message is incorrect. The correct error message should report the SRAM failure.
Workaround: Replace the line card.
•
CSCdt71057
A Cisco 12000 series Internet router with input PSA access control lists (ACLs) may deny IP
protocol 94 traffic even though all IP traffic is permitted on the access list. This situation has been
observed after the access list is between 45 and 50 line long.
Workaround: Explicitly permit IP protocol 94 traffic.
•
CSCdt80914
Entering the show ip cef exact-route command at the head-end of a Multiprotocol Label Switching
(MPLS) Traffic Engineering (TE) tunnel may cause the Route Processor (RP) in a Cisco 12000
series Internet router to reload. There is no workaround.
•
CSCdt84938
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(16)S, the 2x32-bit
Simple Network Management Protocol (SNMP) counters on the main interface may not function
properly. The same counters for the subinterface are not affected. There is no workaround.
•
CSCdt85730
When Multiprotocol Label Switching (MPLS) is configured on a Cisco 12000 series Internet router
that is running Cisco IOS Release 12.0(15)S2 and the router is performing label imposition for
flowing from an Engine 4 line card to an Engine 1 line card, the Engine 1 line card may reload. There
is no workaround.
•
CSCdt85936
Cisco 12000 series Internet router may, on rare occasions, issue environmental warnings for line
cards or fabric modules that are within the appropriate values.
Workaround: Configure the router with the no environment-monitor command.
•
CSCdt87752
When the CPU is busy and has no resources to process an Open Shortest Path First (OSPF) protocol
message, the OSPF neighborhood may collapse. There is no workaround.
•
CSCdt89162
Under some circumstances, certain 448-line access control lists (ACLs) may cause a Cisco router
with an Engine 2 line card to reload. There is no workaround.
•
CSCdt90083
When installing Engine 0-, Engine 1-, Engine 2-, or Engine 4-based line cards in a Cisco 12416
Internet router, ensure that the router is cold-booted. If the router is active when the line card is
inserted, the line card will fail to boot correctly. If the router has been booted with the line card
already installed, a successful online insertion and removal (OIR) can be performed, but if the line
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
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Resolved Caveats—Cisco IOS Release 12.0(18)S
card is removed and reinserted into a different slot, the line card fails to complete the boot sequence
and will constantly cycle through attempts to load and being reset. This situation does not occur with
Cisco 12008, 12012 or 12016 Internet routers.
Workaround: Reboot the router once the line card has been installed.
•
CSCdt90736
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(15)S2 may display error
messages after an online insertion and removal (OIR) of a 16xOC-192 Clock and Calendar Schedule
Card (CSC) or after the hw-module {slot number} shutdown command is entered on the
16xOC-192 CSC. There is no workaround.
•
CSCdt91433
A Multiprotocol Label Switching (MPLS) Virtual Private Network (VPN) provider edge (PE) router
may reload under the following circumstances:
– MPLS IP is globally enabled on the router.
– There are multiple static routes to a prefix in the default routing table.
– At least one of the static routes is recursive.
– At least one of the static routes is nonrecursive.
– The static recursive route resolves to go over a nonpoint-to-point link (for example, Ethernet).
The reload typically shows a traceback similar to the following:
0x6060A8A0:idb_get_swsb(0x6060a86c)+0x34
0x60FCF53C:tagsw_get_tag_dist_method(0x60fcf4a0)+0x9c
0x60FF055C:tfib_request_outgoing_tag(0x60ff0480)+0xdc
0x60FF06A8:tfib_request_outgoing_recursive_tags(0x60ff061c)+0x8c
0x60FF3214:tfib_resolve_recursive(0x60ff30e8)+0x12c
0x60FF5710:tfib_resolve_tag_rewrite(0x60ff5590)+0x180
0x60F4AF58:path_resolved(0x60f4aa90)+0x4c8
0x60F4B84C:ip_fib_resolve_path(0x60f4b244)+0x608
0x60F4BA20:ip_fib_force_resolve_path(0x60f4b94c)+0xd4
0x60FF4940:tfib_route_tag_change(0x60ff44ec)+0x454
0x60FF07C8:tfib_setup_route_tag_change(0x60ff06d4)+0xf4
0x60FCBE34:tib_find_route_tags(0x60fcbc4c)+0x1e8
0x60FF05EC:tfib_request_outgoing_tag(0x60ff0480)+0x16c
0x60FF06A8:tfib_request_outgoing_recursive_tags(0x60ff061c)+0x8c
0x60FF3214:tfib_resolve_recursive(0x60ff30e8)+0x12c
0x60FF5710:tfib_resolve_tag_rewrite(0x60ff5590)+0x180
Workaround: Changing any of the circumstances listed will prevent this situation from occurring. It
is recommended that this change be implemented in the startup configuration rather than waiting for
the router to come up and then implementing the change.
•
CSCdt92270
Committed access rate (CAR) may fail to function properly with multicast packets on a Cisco 7200
series router. This symptom does not affect unicast packets. There is no workaround.
•
CSCdt92307
When a channel group is configured with 8, 11, 13, 14, 15, 19, 23, and 27 time slots, the
corresponding interface experiences line protocol flapping. Other combinations do not cause this
situation. There is no workaround.
•
CSCdt93130
In a network with a provider edge (PE) router that is running Cisco IOS Release12.1(7.3) and
Packet-over-SONET (POS) interface that is running Cisco IOS Release 12.0(15)S1, a problem may
occur with Automatic Protection System (APS) switching from working to protected (and protected
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(18)S
to working). A tag-switching Tag Distribution Protocol (TDP) neighbor is lost when Intermediate
System-to-Intermediate System (IS-IS) switches over to an active POS interface. The show
tag-switching interfaces indicates that the interface is operational.
Workaround: Enter the no tag-switching ip command and tag-switching ip command to restart the
lost TDP neighbor. This command can be entered for the PE router or the POS interface.
•
CSCdt93152
Multicast traffic does not switch from Engine 4 to Engine 0 and Engine 1 line cards. In this situation,
the ingress Engine 4 to fab queues show a multicast queue build-up, but no packets are output by
either the E0 or E1 line cards. Multicast traffic is still successfully switched from Engine 0 and
Engine 1 to Engine 4 line cards. There is no workaround.
•
CSCdt96796
A Cisco router that is running Cisco IOS Release 12.0(13)S2 may experience a memory leak in the
IP Simple Network Management Protocol (SNMP) process. There is no workaround.
•
CSCdu00753
In situations in which a secondary Gigabit Route Processor (GRP) has a faulty connection to the
fabric, it is possible that configuration synchronization may not occur or that the configuration
stamp may not be updated without an obvious error message. The faulty connection is usually
detected through other indicators, such as a failure to get multiple acknowledgements for a
configuration write or IPC timeout when accessing the secondary BOOTVAR. There is no
workaround.
•
CSCdu01075
The show ip accounting command will display large IP counts while Multiprotocol Label
Switching (MPLS) traffic is sent. There is no workaround.
•
CSCdu01110
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(16.5)ST cannot be
pinged through local OC-48 or OC-192 Packet-over-SONET (POS) interface addresses and a
loopback address that is located more than one hop away. There is no workaround.
•
CSCdu01147
When a Traffic Engineering (TE) tunnel is brought up on a Cisco router that is running Cisco IOS
Release 12.0(16.6)S while IP traffic is switching, “PICANTE” errors are triggered, and all the traffic
on that line card stops for a time. There is no workaround.
•
CSCdu01876
On a Cisco 12000 series Internet router, the command line interface (CLI) and Simple Network
Management Protocol (SNMP) MIB may show twice the expected value. This condition has been
observed with both Engine 1 (Gigabit Ethernet) and Engine 2 (QOC-12). There is no workaround.
•
CSCdu03539
When an output link is oversubscribed with lower priority traffic, the low latency queueing (LLQ)
traffic over the link may be subjected to a larger amount of latency than usual (3-4 milliseconds).
Workaround: Avoid enabling the tx-cos name interface configuration command and oversubscribing
the link.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2267
Resolved Caveats—Cisco IOS Release 12.0(18)S
•
CSCdu04427
A Cisco 12000 series router with an enabled Ethernet interface on the route processor may not boot
up properly when running Cisco IOS Release 12.0(16.6)S.
Workaround: Boot the router through the Ethernet 0 interface, and shut down the Ethernet 0 interface
immediately after the router has completely booted up.
•
CSCdu06930
A Cisco 7500 series router that is running Cisco IOS Release 12.0(16)S with distributed Multilink
PPP (MLPPP) enabled may experience bounced traffic if the amount of traffic that is sent through
the multilink interface is double the capacity of the interface. There is no workaround.
•
CSCdu07275
Conform rates that are not set to be a multiple of 200,000 bps may not function properly. The
discrete level of the conform rate for OC-192 or Quad OC-48 line cards should be set to a multiple
of 200,000 bps. For example, a conform rate from between 300,000 bps and 500,000 bps should be
set to an actual conform rate of 400,000 bps.
Workaround: Configure the conform rate to be a multiple of 200,000 bps.
•
CSCdu07559
A gsr with a ATA disk (SAN DISK) in the first PCMCIA slot (disk0:) may crash (Software forced
crash) when the latest conn_isp image 120(16.6)S is loaded.
•
CSCdu07732
When a Packet-over-SONET (POS) line card is reinserted after it is replaced by another POS card,
snmpwalk works on the ifTable for all interfaces but snmpget may fail on some POS interfaces.
There is no workaround.
•
CSCdu08444
Entering the show ip psa ip-address command on a router that is configured with per prefix
accounting will cause an Engine-2 line card (for example, OC-48) to reload.
Workaround: Disable per prefix accounting.
•
CSCdu09160
A Cisco 12000 series router that has Engine 4 line cards may not support ingress or receive Weighted
Random Early Detection (WRED) for both multicast and unicast traffic. There is no workaround.
•
CSCdu09725
It is not possible to write Crashinfo data to an ATA sandisk from a Cisco router that is running
Cisco IOS Release 12.0 S or Cisco IOS Release 12.0 ST. This caveat is not present in other
Cisco IOS releases. There is no workaround.
•
CSCdu01019
On a Cisco 12400 Internet router that is running with tag switching enabled, the show interface
accounting command may not register the transmitted tagged packets in Cisco IOS Release
12.0(16.5)S. There is no workaround.
•
CSCdu10912
When an online insertion and removal (OIR) is performed on a primary clock switched card (CSC)
fabric card after the hw-module slot_number shut command is entered, faulty OIR messages may
be displayed. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2268
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Resolved Caveats—Cisco IOS Release 12.0(18)S
•
CSCdu11279
A Cisco 7500 series router with a Multichannel T3 Port Adapter (PA-MC-2T3+) may report cyclic
redundancy check (CRC) errors when it is configured with a CRC-32.
Workaround: Use the port adapter with CRC-16 instead.
•
CSCdu11691
A Cisco 12000 series router with a single Route Processor (RP) that is running Cisco IOS
Release 12.0(16)S or 12.0(16)S1 does not permit simultaneous configurations from multiple Telnet
sessions. Only a single Telnet session is allowed to enter the configuration mode at any one time.
This symptom does not occur on routers with dual route processors.
Workaround: Add an additional RP onto the system to permit simultaneous configurations from
multiple Telnet sessions. The additional RP can be removed after it has booted as a secondary RP.
•
CSCdu19182
The show aps command requires an argument of either a group number, a POS interface ID, or a
SONET controller interface ID. The default form of the command with a defaulted argument is
rejected. There is no workaround.
•
CSCdu22137
An Engine 4 line card may display the following messages when it encounters certain non-IP
packets.
SLOT 3:*May 10 10:46:59 UTC: BHdr->len-8 < IP->tot_len
Workaround: Reload the line card.
•
CSCdu25293
A Cisco router with an Engine 4 line card that is running Cisco IOS Release 12.0(16.6)S3 may
reload while running line rate traffic. There is no workaround.
•
CSCdu38395
A Cisco router that is running Cisco IOS Release 12.0(17.1)S, 12.1(3.1), or 12.2(3.1) or later that is
configured for Hot Standby Router Protocol (HSRP) on only certain Inter-Switch Link (ISL)
subinterfaces may experience spurious memory access. This situation may occur when HSRP is not
configured on all ISL subinterfaces.
Workaround: Configure HSRP on all ISL subinterfaces.
•
CSCdu42275
Applying a large access-list (approximately 3,000 lines) to a Cisco 3-Port Gigabit Ethernet line card
may cause the router to reload. There is no workaround.
•
CSCdu50386
If a single-port OC-48 line card is configured as the tunnel server card while installed in slot 0 of a
Cisco 12000 series Internet router, the output of the showing running-configuration command
does not show the “hw-module slot0 mode server” line. In this situation, if the router is reloaded,
the line card is not configured to act as the tunnel server and all Universal Transport Interface (UTI)
tunnels that are present on the router fail.
Workaround: Manually configure the line card to act as the sever by entering the hw-module slot0
mode server command.
•
CSCuk23290
The output of the show ip cef inconsistency record command may not include expected event log
entries for the recorded inconsistency occurrences. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2269
Resolved Caveats—Cisco IOS Release 12.0(17)S7
•
CSCuk23524
A Cisco 12000 series router may experience some missing prefixes in the Cisco Express Forwarding
(CEF) tables on some line cards after the router is reloaded or when an online insertion and removal
(OIR) is performed on a line card.
Workaround: Enter the clear cef linecard command on each slot after a reload or OIR to ensure that
the CEF table is correctly downloaded.
Resolved Caveats—Cisco IOS Release 12.0(17)S7
Cisco IOS Release 12.0(17)S7 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S7. This section describes only severity 1 and 2
caveats.
•
CSCea02355
Cisco routers and switches running Cisco IOS software and configured to process Internet Protocol
version 4 (IPv4) packets are vulnerable to a Denial of Service (DoS) attack. A rare sequence of
crafted IPv4 packets sent directly to the device may cause the input interface to stop processing
traffic once the input queue is full. No authentication is required to process the inbound packet.
Processing of IPv4 packets is enabled by default. Devices running only IP version 6 (IPv6) are not
affected. A workaround is available.
Cisco has made software available, free of charge, to correct the problem.
This advisory is available at
http://www.cisco.com/warp/public/707/cisco-sa-20030717-blocked.shtml
Resolved Caveats—Cisco IOS Release 12.0(17)S6
Cisco IOS Release 12.0(17)S6 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S6. This section describes only severity 1 and 2
caveats.
•
CSCdx06621
If multiple routers are advertising the same prefix in Type-5 or Type-7 link-state advertisements
(LSAs), a router may reload with a bus error while the shortest path first (SPF) algorithm is
computed. There is no workaround.
•
CSCdx29393
If an Engine 2, 16-port OC3 line card is configured with 16 different input ACLs, Cisco Express
Forwarding (CEF) may get disabled on the line card when about 100K Border Gateway Protocol
(BGP) routes are present. There is no workaround.
•
CSCdx32658
On a Cisco 12000 series Internet router, if you ping the loopback address from the west-end to the
east-end router, datagrams are dropped. The first packet size ranges to fail are the packets between
77 and 80 and between 605 and 608. Only these packet ranges are being dropped; all other packets
get through. There is no workaround.
•
CSCdx65248
A memory leak on an OC3 (Eng0) line card may cause Cisco Express Forwarding (CEF) to be
disabled. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2270
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S5
•
CSCdx67418
When a router has a dual Route Processor (RP) configuration with 512MB in each Gigabit Route
Processor (GRP), the router may not boot. There is no workaround.
•
CSCdx69170
Enabling 448 lines of ingress ACL on E2 (QOC12 POS, 1xOC48 POS, and OC48 DPT) line cards,
on a Cisco 12000 router that is running Cisco IOS Release 12.0(21.3)S2 may cause forwarding
traffic to fail. There is no known workaround.
•
CSCdx69852
On a Cisco 12416 router that is running Cisco IOS 12.0(17)S5.0522 with redundant Gigabit Route
Processors (GRPs), one or more line cards may have Cisco Express Forwarding (CEF) disabled after
a redundancy force-failover command is issued. There is no workaround.
•
CSCuk34118
If a line card is online insertion and removal (OIR) out during the linecard Cisco Express
Forwarding (CEF) table(s) download, all other line cards can get stuck in the “request-reload state”
waiting for the OIR out linecard to finish its download.
Workaround: Reinstall the linecard into the OIR out slot.
•
CSCuk34310
A Cisco 12000 series Internet router reloads unexpectedly after multiple Border Gateway Protocol
(BGP) route state transitions (flaps) occur. This symptom is observed on a Cisco 12000 series
Internet router that has Multiprotocol Label Switching (MPLS) enabled. There is no workaround.
•
CSCdx45298
A Cisco Express Forwarding (CEF) inconsistency may occur between the Gigabit Route Processor
(GRP) and the Engine 2 line card. This inconsistency causes flapping and has been observed when
there are recursive prefixes and suboptimal line quality.
Workaround: Clear the CEF line card X.
Resolved Caveats—Cisco IOS Release 12.0(17)S5
Cisco IOS Release 12.0(17)S5 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S5. This section describes only severity 1 and 2
caveats.
•
CSCdw09409
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(17)S,
Release 12.0(18)S, Release 12.0(19)S, or a rebuilt release that is based on one of these three
releases, and that is configured with one or more 3-port Gigabit Ethernet line cards may show the
following two symptoms:
– The router may become totally inoperable and no longer forward traffic or respond to console
commands. Restoring the affected router to normal operation requires either a manual power
cycling or a break- in and soft reset using the console break sequence.
–
The router may reload because of a software-forced reload. This occurs because the router goes
into an infinite look, and the watchdog timer starts and reloads the router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2271
Resolved Caveats—Cisco IOS Release 12.0(17)S5
This situation is caused by a very rare event in the Address Resolution Protocol (ARP) code that
may cause data structure corruption, which results in system instability. Because of the rare nature
of this event, the affected router may experience intermittent hangs at intervals of hours up to several
months. There is no workaround. (Upgrade a susceptible router to a Cisco IOS software release in
which this caveat has been resolved.)
Note
•
This caveat does not apply to a router that is configured with one or more single-port Gigabit
Ethernet line cards.
CSCdu29618
Under certain conditions on a Cisco 12000 series Internet router, Engine 4 line cards may update
Cisco Express Forwarding (CEF) entries slower than Engine 2 line cards do. There is no
workaround.
•
CSCdu22137
An Engine 4 line card may display the following messages when it encounters certain non-IP
packets.
SLOT 3:*May 10 10:46:59 UTC: BHdr->len-8 < IP->tot_len
Workaround: Reload the line card.
•
CSCdw29949
If you enable tag-to-tag load balancing on a Cisco 12000 series Internet router with an Engine 4 line
card that serves as an ingress line card, the router stops forwarding traffic.
Workaround: Enter the clear ip route * command.
•
CSCdu64069
IP coloring (IP marking) may fail to mark a packet if IP coloring is configured on an interface with
an input Access Control List (ACL), or if any interface on a Cisco 12000 Internet Router has an
output that has an output ACL. ACL will still function as normal. This condition only occurs if IP
coloring is configured on an E2 line card. There is no workaround.
•
CSCdv01350
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0 S may see Internet
Group Management Protocol (IGMP) mtrace response packets (protocol=2, IGMP type=0x1E) stay
in an interface input hold queue indefinitely. These packets may eventually fill up the interface input
hold queue and cause packet drops.
Workaround: Reload the router to clear the packets from the input hold queue, and increase the input
hold queue depth using the hold-queue queue-length interface configuration command.
•
CSCdx20954
A Cisco 12000 series OC-3 line card may reload unexpectedly and then recover. There is no
workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2272
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S4
Resolved Caveats—Cisco IOS Release 12.0(17)S4
Cisco IOS Release 12.0(17)S4 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S4. This section describes only severity 1 and 2
caveats.
•
CSCdv04951
A Cisco 7200 series router may reload when it is passing heavy traffic of large packets through a
PA-A1 port adapter. The reload does not occur under normal traffic conditions.
Possible workaround: Reduce the maximum transmission unit (MTU) size of the ATM interface so
that the interface never has to pass a packet of more than 4500 bytes.
•
CSCdv14760
On a Cisco 12000 series Internet router, the configuration of the ip route-cache cef command on
the Ethernet 0 interface results in the following error message:
%CEF not supported for ARPA
Cisco Express Forwarding (CEF) cannot be enabled on the Ethernet 0 interface.
Note
•
The Gigabit Route Processor (GRP) Ethernet port is designed for use as a management
interface only. Cisco does not support either the use of Ethernet 0 as a traffic-switching port
or the enabling of CEF on this port. Cisco will likely disable the ip route-cache cef for
Ethernet 0 in future Cisco IOS releases. Cisco encourages customers to migrate from
Ethernet 0 switching configurations. Ethernet line cards are available for the Cisco 12000
series Internet router for customers who require Ethernet interfaces.
CSCdv42325
On a Cisco 12000 series Internet router, switching from load balancing to a fast adjacency or from
a fast adjacency to load balancing may result in traffic loss. There is no workaround.
•
CSCdv90792
A 3-port Gigabit Ethernet line card that is installed in a Cisco 12000 series Internet router that is
running Cisco IOS Release 12.0(16)S or higher 12.0(16)S releases may reload intermittently with
“PSAERRSS” errors and bus errors under the following conditions:
a. At least five output access control lists (ACLs) are configured on the router (the sixth output
ACL is being handled by the CPU of the line card).
b. Ingress traffic that is destined for egress on the local line card is matching access control entries
(ACEs) that are being executed on the ingress CPU.
c. A large volume of Border Gateway Protocol (BGP) routes are present.
d. The above-mentioned traffic scenario occurs during periods of heavy changes in the Forwarding
Information Base (FIB).
“FIB-4-RADIX” insert messages may be displayed before the line card reloads.
This issue is resolved in Cisco IOS Release 12.0(16)S7 and higher releases. There is no workaround
for the affected releases.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2273
Resolved Caveats—Cisco IOS Release 12.0(17)S4
•
CSCdw10748
A Cisco 12016 Internet router that is running Cisco IOS Release 12.0(15)S, Release 12.0(19)S, or
any release in between these releases may not correctly switch over to the backup Clock Scheduler
Card (CSC) in the event of a CSC failure because of a “grant parity” or “request parity” error. If one
of these errors occurs, the following message may be seen in the output of the show log command:
Sep 22 03:00:56.674 JST: %FABRIC-3-PARITYERR: To Fabric parity error was detected.
Grant parity error Data = 0x2.
SLOT 1:Sep 22 03:00:56.674 JST: %FABRIC-3-PARITYERR: To Fabric parity error was
detected. Grant parity error Data = 0x1
The output of the show controller fia command may look as follows:
Fabric configuration: Full bandwidth redundant
Master Scheduler: Slot 16
From Fabric FIA Errors
-----------------------redund fifo parity 0
redund overflow 0
cell drops 116
crc32 lkup parity
cell parity
crc32
0
0
Switch cards present
0x001F
Slots
16 17 18 19 20
Switch cards monitored
0x001F
Slots
16 17 18 19 20
Slot:
16
17
Name:
csc0
-------- -------los
0
18
csc1
-------1
19
sfc0
-------0
sfc1
-------0
0
20
sfc2
-------0
state
Off
Off
Off
Off
Off
crc16
1167
402
1167
1167
1167
To Fabric FIA Errors
---------------------sca not pres 0
req error
xx
uni fifo overflow 0
grant parity xx
multi req
0
uni fifo undrflow 0
cntrl parity 0
uni req
0
crc32 lkup parity 0
multi fifo
0
empty dst req 0
cell parity
0
handshake error
0
For further information, see the Fabric Parity Error on GSR CSC16 Card Field Notice at the
following location: http://www.cisco.com/warp/public/770/fn16872.shtml.
There is no workaround.
•
CSCdw17012
On a Cisco 12000 series Internet router that is configured with an Engine 4 line card that has
256 MB of CPU memory, the show processes memory command may show more than 4 GB of used
memory. When the counter reaches 4.2 GB, it may reset to 0, which causes the line card to think it
has run out of memory and to disable Cisco Express Forwarding (CEF). Issuing the clear cef
linecard [slot-number] command will bring the line card back up. There is no workaround for the
memory problem or to prevent the counter from resetting to 0.
•
CSCdw24515
A Cisco 12000 series 10-port 1-Gigabit Ethernet line card may reload if you apply the same access
control list (ACL) to two or more main interfaces and subsequently apply any ACL to a subinterface
on one or more of the main interfaces. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2274
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S3
•
CSCdw47388
If you configure an output access control list (ACL) with 448 lines on a Cisco 12000 series Internet
router, and the ingress line card for the traffic that needs to be filtered is an 8-port or 16-port OC-3
Packet-over-SONET (POS) line card, the output ACL will not filter traffic.
Workaround: Do not configure an ACL with more than 128 lines on any interface of a Cisco 12000
series Internet router that is configured with an 8-port or 16-port OC-3 POS line card.
•
CSCdw65903
An error can occur with management protocol processing. Please use the following URL for further
information:
http://www.cisco.com/cgi-bin/bugtool/onebug.pl?bugid=CSCdw65903
•
CSCuk30224
On platforms that support distributed Cisco Express Forwarding (dCEF), when CEF reloads the
forwarding table on a line card, either at boot time or after an online insertion and removal (OIR)
event, the Forwarding Information Base (FIB) of the line card may be missing one or more prefixes.
Workaround: Enter the clear cef linecard slot on the affected line card.
Resolved Caveats—Cisco IOS Release 12.0(17)S3
Cisco IOS Release 12.0(17)S3 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S3. This section describes only severity 1 and 2
caveats.
•
CSCds37169
When IP Cisco Express Forwarding (CEF) is enabled on a Route Switch Module (RSM) and you
reload the RSM, the interfaces show that the no ip route-cache cef interface configuration command
is enabled, which causes the CPU to run at 99 percent.
Workaround: Manually change the configuration.
•
CSCdt06162
On a Cisco 12000 series Internet router, the 1-minute input rate statistics in the output of the show
interfaces privileged EXEC command may not accurately reflect the traffic load on the interface.
There is no workaround.
•
CSCdt96253 and CSCdu37371
Three different Cisco product lines are susceptible to multiple vulnerabilities in the Secure Shell
(SSH) protocol. These issues are inherent to the SSH protocol version 1.5, which is implemented in
several Cisco product lines.
By exploiting the weakness in the SSH protocol, it is possible to insert an arbitrary command into
an established SSH session, collect information that may help in brute force key recovery, or brute
force a session key.
The affected product lines are as follows:
– All devices, including routers and switches, running Cisco IOS software supporting SSH
– Catalyst 6000 switches running CatOS
– Cisco PIX Firewall
No other Cisco products are vulnerable.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2275
Resolved Caveats—Cisco IOS Release 12.0(17)S3
It is possible to mitigate this vulnerability by preventing, or having a control over, interception of
SSH traffic. see the advisory at the following URL:
http://www.cisco.com/warp/public/707/SSH-multiple-pub.html
•
CSCdu05173
A Cisco 7500 series router may use invalid Cisco Express Forwarding (CEF) entries on Versatile
Interface Processors (VIPs) to switch traffic when distributed Cisco Express Forwarding (dCEF) is
disabled. The CEF entry on the Route Switch Processor (RSP) is valid while the entry on the VIP is
invalid.
Workaround: Reboot the VIP and use the clear cef line slot command to clear the lines for each VIP
until all the VIPs become visibly synchronized in the output when the show cef linecard command
is entered.
•
CSCdu35175 and CSCdu57417
Six vulnerabilities involving the access control list (ACL) have been discovered in multiple releases
of Cisco IOS software for the Cisco 12000 series Internet router. Not all vulnerabilities are present
in all Cisco IOS releases, and only line cards based on the Engine 2 are affected by them. No other
Cisco product is vulnerable.
The workarounds are described in the “Workarounds” section of the advisory that is available at the
following URL:
http://www.cisco.com/warp/public/707/GSR-ACL-pub.shtml
Workaround: Use the shut command followed by the no shut command to flap the interface.
•
CSCdu53584
The switching path changes from distributed Cisco Express Forwarding (dCEF) to Cisco Express
Forwarding (CEF) after 40 online insertion and removal (OIR) events. This condition affects quality
of services (QoS) functionality and the performance of the router, which requires a dCEF path.
There is no workaround.
•
CSCdu81007
The Cisco Express Forwarding (CEF) table is not updated properly when the IP address of an
interface changes. The new IP address is added to the CEF table but the old one is not removed. If
subinterfaces are used, the old ones remain in the CEF table even after the subinterfaces are
removed.
Workaround: When you issue the shut command on the subinterface before changing the address,
the IP address is correctly deleted from the CEF tables.
•
CSCdu81936
If a router receives an Address Resolution Protocol (ARP) packet that has the router’s own interface
address but with a different MAC address, the ARP packet can overwrite the router's own MAC
address in the ARP table, causing that interface to stop sending and receiving traffic. This attack is
successful only against interfaces on the Ethernet segment that is local to the attacking host.
Workaround: Hard-code the interface's ARP table entry by using the arp ip-address
hardware-address type [alias] command. This entry will remain in the ARP table until the clear arp
command is issued. see the advisory at the following URL:
http://www.cisco.com/warp/public/707/IOS-arp-overwrite-vuln-pub.shtml
•
CSCdu87946
On a Cisco 12000 series Internet router that has tag switching configured, an OC-192 line card may
reload when the network mask is changed from /30 to /24. This condition has been observed in
Cisco IOS Release 12.0(17)S, 12.0(18)S, and 12.0(19)S. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2276
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S3
•
CSCdv01853
A Cisco router may experience a software-forced reload at ip_arp_refresh_adj after the no
shutdown command is entered on a multipoint subinterface in LAN Emulation (LANE) testing.
There is no workaround.
•
CSCdv05120
A line card on a Cisco router that is running distributed Cisco Express Forwarding (dCEF) with
Cisco IOS Release 12.0(19)S or later may be missing interfaces and interface-related
configurations, such as access lists, after a boot or after enabling dCEF. There is no workaround.
•
CSCdv24152
A Cisco router that is running Cisco IOS Release 12.0(17)S and later 12.0 S releases may reset if
Frame Relay has been incorrectly configured. If you apply the same data link control (DLC) value
on an interface and on its subinterface twice in a row, the router may reset. There is no workaround.
•
CSCdv32536
When a Cisco 7200 series router that is configured with an ATM-PA-A3 port adapter receives
packets with a multicast MAC address on a virtual circuit (VC) that has been configured for
1483-bridged mode, all packets with the multicast MAC address are dropped. There is no
workaround.
•
CSCdv33612
A Cisco 12000 series Internet router may exhibit any of the following symptoms:
– Packets that exit the router have a corrupted or invalid MAC header. A common example of this
situation occurs when a single-hop Traffic Engineering (TE) tunnel is configured out of a given
interface. In this case, IP packets that exit other interfaces on the same line card will have a
Multiprotocol Label Switching (MPLS) process identification number (PID) field in the
High-Level Data Link Control (HDLC)/PPP header.
– Traffic gets dropped in the incoming line card. This situation presents itself in the case of
multicast traffic for which no matching (S,G) entry is found in the line card. In this situation,
traffic gets sent to the Route Processor or dropped.
There might be other symptoms that have not been observed yet. The easiest way to determine the
existence of this error condition is to enter the show gsr encapsulation command; if the output of
the Output Info record is empty even though there are point-to-point interfaces in the system that
are up and running, you have encountered this error condition.
Workaround: For the cases with invalid MAC headers due to of a single-hop TE tunnel that is
present, bring down a physical interface that has no tunnels on it and that is on the same line card,
wait a few seconds, and bring it back up. If the TE tunnel goes down and comes back up, the router
will experience the same situation, and a physical interface that is not being used by the tunnel will
need to be flapped again. For the cases where traffic is not sent out at all, there is no known
workaround.
•
CSCdv47664
The online insertion and removal (OIR) of a Versatile Interface Processor (VIP) in a Cisco 7500
series router may cause Cisco Express Forwarding (CEF) to become disabled on VIP cards in other
slots.
Workaround: Enter the microcode reload global configuration command after a failed OIR.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2277
Resolved Caveats—Cisco IOS Release 12.0(17)S2
•
CSCdv51463
A Cisco router may experience problems with the Address Resolution Protocol (ARP) when Cisco
Express Forwarding (CEF) is enabled.
Workaround: Disable CEF.
•
CSCdv53894
A Cisco 12000 series Internet router may fail to correctly forward IP multicast packets out of an
interface. When this condition occurs, the router generates the following error message:
%GRP-3-ENCAP: Failure to allocate encap table entry, exceeded max number of entries
On the outgoing line card, the “exec slot N show controller rewrite” message (in which “N”
represents the line card) displays empty (0) adjacency information for the affected multicast routes:
(209.165.200.224, 255.255.255.224)
SRP0/0
In: POS3/0
0x00000000 (0):
There is no workaround.
•
CSCdv81133
On a Cisco 12000 series Internet router, when you connect and disconnect the Rx cable between
Engine 4 Packet-over-SONET line cards and a Cisco ONS platform, continuous ping failures may
occur, although the line cards are in an up/up state.
Workaround: Issue the hw-module slot x reload command on the line cards.
•
CSCdv88646
A Cisco 12000 series Internet router that is configured with an Engine 4 plus card may generate
tracebacks, causing Cisco Express Forwarding (CEF) to be disabled. There is no workaround.
•
CSCdw03179
When you configure a Packet-over-SONET 8xOC-3 line card in a Cisco 12000 series Internet router
as an Automatic Protection Switching (APS) working or protecting line card, the line card may
accept input traffic even while it is deselected by APS. This condition causes duplicated packets.
Workaround: When the error condition occurs, enter the shut command followed by the no shut
command on the line card that is deselected by APS.
•
CSCuk27669
Entering the show ip cef EXEC command may cause a Cisco router to reload if load-shared paths
change while the command executes. There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(17)S2
Cisco IOS Release 12.0(17)S2 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S2. This section describes only severity 1 and 2
caveats.
•
CSCds85383
For Cisco 12000 series Internet routers that have 6-port channelized T3 (CT3) line cards and that
are running Cisco IOS Release 12.0(14)S to 12.0(17)S, the state of T3s or T1s may be reported
incorrectly, and CT3 interfaces may remain down even though the corresponding T1s are up but
reported as down. The output of the show ipc status EXEC commands on the router processor
indicate that some interprocess communication (IPC) messages have timed out.
Workaround: Reset the line card.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2278
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S2
•
CSCdt63459
On a Cisco 7513 router that has a Route Switch Processor 4 (RSP4) that is configured with 128 MB
DRAM and is carrying 11,000 routes, entering the clear cef linecard EXEC command may cause
all available memory to be consumed.
Workaround: Enter the clear ip bgp {*} EXEC command before entering the clear ip cef EXEC
command.
•
CSCdu26757
A single-port Gigabit Ethernet line card may fail with Unicast timeouts. This situation occurs only
if bad IP packets are received by the last hop of a Multiprotocol Label Switching (MPLS)-enabled
network (for example, when the last tag is popped and the packet is sent out as an IP packet). There
is no workaround.
•
CSCdu27583
A 3-port Gigabit Ethernet line card may reload with a bus error exception. There is no workaround.
•
CSCdu43315
In a configuration in with multiple T1 through T3 interfaces, it may not be possible to query for
Simple Network Management Protocol (SNMP) statistics because the snmpwalk and snmpget
functions do not display data for some interfaces. There is no workaround.
•
CSCdu47902
Inserting a large number of Border Gateway Protocol (BGP) routes may cause memory to become
fragmented and result in distributed Cisco Express Forwarding (dCEF) becoming disabled because
of a low memory condition. There is no workaround.
•
CSCdu50927
A Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(17)S might generate the
following error message:
%GRP-3-ENCAP: Failure to allocate encap table entry, exceeded max number of entries,
slot 3 (info 0x8000)
-Traceback= 602555E0 60255AC4 602560E0 600F783C 600F7914 600F71C4 600F7288 605690C4
6056C0DC 60569C74 605697A0 603544B4 603537A0 6035397C 60353AF0 6019254C
There is no workaround.
•
CSCdu54878
On Engine 2 line cards on a Cisco 12000 series Internet router, when two PSA access control lists
(ACLs) are configured and then removed, the correct feature microcode may not be loaded.
Workaround: Perform a microcode reload on the line card.
•
CSCdu58406
Entering the no ip source-route global configuration command on a Gigabit Router Processor
(GRP) does not stop the Cisco 12000 series Internet router from routing packets that contain
source-route information. There is no workaround.
•
CSCdu58623
If confederation information is not added by an external BGP (eBGP) neighbor, the connection is
not dropped or updated.
Workaround: Configure an AS-PATH filter “\(*|)” with the eBGP.
•
CSCdu60861
Engine 4 line cards in a Cisco 12000 series Internet router may reload while running IP Multicast
when IP prefix counter memory is exhausted. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2279
Resolved Caveats—Cisco IOS Release 12.0(17)S1
•
CSCdu66206
Multicast Output interfaces (OIFs) are missing from certain groups causing multicast traffic to be
affected. This condition normally occurs during startup because of the varying speeds in which the
cards are turned on.
Workaround: Reload the microcode on the card that contains the missing OIFs.
Note
•
Reloading the microcode may lead to issues that are related to caveat CSCuk22826.
CSCdu72555
Running Sampled NetFlow to collect the traffic from a 3-port Gigabit Ethernet line card on a Cisco
12016 Internet router may only collect traffic on the first Gigabit interface. There is no workaround.
•
CSCdu83386
The ip helper-address address interface configuration command does not work when it is
configured on a Cisco 12000 Internet Router. There is no workaround.
•
CSCdu88600
Bridged-style permanent virtual circuits (BPVCs) half-bridging commands are not implemented
with the new group of ATM commands. There is no workaround.
•
CSCdv10979
Shutting down and restarting a Clock Scheduler Card on a Cisco 12000 series Internet router that is
running Cisco IOS Release 12.0(17)S or 12.0(17)ST with the hw-module command might cause the
router to appear to pause indefinitely.
•
CSCdv11376
Multicast packets that are sent from an Engine 2 line card to a DPT 48 node in dense mode might
not be switched for some groups. This condition occurs because of inconsistencies in the (*,G) and
(S,G) tables on the Engine 2 line card. For some groups, the DPT48 node is in the (*,G) table and
not in the (S,G) table. There is no workaround.
•
CSCdv14967
OC-3 and SRP-12 line cards might show incorrect traffic output statistics when traffic travels
through an OC-192 interface and exits through a non-OC-192 interface.
Correct traffic output statistics are displayed when the OC-3 line card is configured with Committed
Access Rate (CAR).
Workaround: Configure the OC-3 line card with CAR.
Resolved Caveats—Cisco IOS Release 12.0(17)S1
Cisco IOS Release 12.0(17)S1 is a rebuild of Cisco IOS Release 12.0(17)S. All the caveats listed in this
section are resolved in Cisco IOS Release 12.0(17)S1. This section describes only severity 1 and 2
caveats.
•
CSCds23223
A configuration that involves an ingress access control list (ACL) on one Engine 2 line card,
combined with an output ACL and output Committed Access Rate (CAR) on another Engine 0, line
card, may result in a line card reload when traffic is passed through the Engine 0 line card path.
There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2280
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Resolved Caveats—Cisco IOS Release 12.0(17)S1
•
CSCds33282
On a Cisco router, a Simple Network Management Protocol (SNMP) agent does not allow the packet
size to be greater than 2048 bytes, even though the configurable packet size is from 484 bytes to
17,940 bytes.
Workaround: If the SNMP GET request message is used with multiple variable BINDs, the request
message size can be reduced by dividing the variable BINDs into more than one GET request
message. If the SNMP GET-BULK request message is used, the non-repeats and max-repetitions can
be adjusted to have a reply packet size of fewer than 2048 bytes.
•
CSCds78877
A Cisco 12016 series Internet router with two clock switched cards (CSCs) may display the
following error messaged during a cold boot (the second CSC is installed for redundancy):
MBUS-3-BADCLK: Slot 0 does not see fabric clock from CSC_0 Card will not operate on
fabric using this clock
Possible workarounds: Perform one of the following actions:
– After the error message is displayed, reload the Cisco 12016 series Internet router with a warm
boot, and verify that the redundant CSC has been accepted by the system with the show
controllers clock EXEC command.
– Reseat the CSC that is specified by the error message.
•
CSCds86023
A PA-E3 controller installed on a Cisco 7206VRX router that is running Cisco IOS Release
12.0(13)S, 12.0(14)S, or 12.1(5) may reset itself frequently. One carrier transition is registered for
each interface reset. The output of the show controllers privileged EXEC command shows that the
tx_fullring value increases in proportion to the interface resets. Under this condition, a memory leak
in the I/O-2 pool reloads the router. There is no workaround.
•
CSCdt19638
A Cisco router may not propagate an updated Border Gateway Protocol (BGP) best path to other
BGP peer routers. This condition occurs under rare circumstances.
Workaround: Enter the clear ip bgp * out EXEC command to update BGP peer routers with the
current best path attributes.
•
CSCdt26263
A Cisco 12000 series Internet router can, when under heavy load conditions, with several thousands
of BGP routes and line rate traffic, suffer from extended traffic disruption. This condition seems
more likely to occur when the router contains hundreds of MPLS Traffic Engineering tunnel heads.
Workaround: If this condition surfaces, ease up incoming traffic into the router significantly. When
traffic flow is reestablished, restart full traffic flow. It might be necessary in extreme cases, to reload
a linecard with the microcode reload slot command.
•
CSCdt42684
An Ethernet interface on a PA-8E port adapter may enter a down state and not respond to the
configuration of the no shutdown command. There is no workaround.
•
CSCdt67965
Under certain circumstances, Rivest, Shamir, and Adelman (RSA) keys generated in Cisco IOS
software are not recognized when a Cisco router reloads. Error messages about Secure Shell (SSH)
configuration commands, which rely on RSA keys to exist may occur. When the RSA keys are not
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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2281
Resolved Caveats—Cisco IOS Release 12.0(17)S1
read, the SSH configuration also cannot be read. Error messages about the SSH commands are
displayed on the console after boot up. This situation is caused by a bad default value in the hardware
clock of the router (the value appears as 1917).
Workaround: Set the value of the hardware clock to a reasonable value using the clock set EXEC
command followed by the clock update-calendar EXEC command before regenerating the RSA
keys.
•
CSCdt68416
Firmware needs to be reset because of a firmware directory (FW) watchdog timeout when Frame
Relay is configured. There is no workaround.
•
CSCdt72474
A Cisco router reloads when you add the 25th subnet mask to a variably subnetted network.
Workaround: Do not add the 25th subnet mask to a variably subnetted network.
•
CSCdt78876
A Cisco 12000 series Internet router that has multiple Engine 2 line cards installed may experience
a situation whereby multiple line cards may run out of memory simultaneously. Cisco Express
Forwarding (CEF) becomes disabled on the affected cards after the following error message is
displayed:
%SYS-4-EXMALLOCFAIL: External memory allocation of 768000 bytes failed from EXMEM 1
There is no workaround.
•
CSCdt81093
Committed Access Rate (CAR) limits will not function properly when Cisco Express Forwarding
(CEF) is enabled on a router. When CEF is disabled on a router, CAR limits function properly. (This
configuration is not supported.) This behavior has been observed on routers that use the same
interface for input and output traffic. There is no workaround.
•
CSCdt85356
A Versatile Interface Processor (VIP) may reload with distributed Cisco express forwarding (dCEF)
and Multiprotocol Label Switching (MPLS) configured on a tunnel interface after the following
sequence of commands:
no interface tunnel x
interface tunnel x
microcode type sys slot
There is no workaround.
•
CSCdt89344
Under some circumstances, inserting routes into a routing table may cause memory to become
fragmented.
Temporary workaround: Configure the memory free-list 65488 command.
•
CSCdt92114
Inconsistent behavior has been observed on a Cisco router when Cisco Express Forwarding (CEF)
is configured with routing protocols that use holddown to protect against suboptimal routing.
Process switching prevents packets from being forwarded when the route is in a holddown state.
However, CEF removes the forwarding information from the Forwarding Information Base (FIB)
when a route enters a holddown state. This configuration causes a condition in which CEF switching
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(17)S1
black holes traffic. This condition has been observed in routers that are configured with CEF and
Route Information Protocol (RIP), RIP version 2, and Interior Gateway Routing Protocol (IGRP).
There is no workaround.
•
CSCdu00679
A Cisco router that is running Cisco IOS Software Release 12.0(13)S2 may reload because of a bus
error when receiving a Border Gateway Protocol (BGP) update with an extended as_path length.
There is no workaround.
•
CSCdu02632
After you log in, log out, and log in again to a secondary Gigabit Route Processor, exec-timeout 15
0 is overwritten by exec-timeout 0 0 in the running-config.
Workaround: Log in by Telnet.
•
CSCdu03734
A Cisco router may fail to forward generic routing encapsulation (GRE) and Cisco Express
Forwarding (CEF) Address Resolution Protocol (ARP) requests.
Workaround: Disable CEF on the tunnel interface.
•
CSCdu03885
When an egress port is oversubscribed with multicast traffic, Engine 4 (E4) line cards on the egress
side may assert back pressure on ingress line cards before all available buffers are used. This causes
multicast packets to be dropped on the ingress line cards. This symptom does not occur when unicast
traffic is present.
Workaround: Configure Weighted Random Early Detection (WRED) or use the tx-queue-limit
number interface configuration command on the egress ports.
•
CSCdu07609
A Cisco 12000 series router that is running Cisco IOS Software Release 12.0(16)S with a Gigabit
Ethernet adapter may occasionally fail to detect remote failure on a connected router. There is no
workaround.
•
CSCdu08280
A Packet-over-SONET (POS) OC-192 line card may reload when the configured output rate shaping
rates are changed while multicast traffic is coming in from a POS OC-48 line card. There is no
workaround.
•
CSCdu10933
A Cisco 7500 series router or Cisco 12000 series Internet router may experience a memory leak
under any of the following Conditions:
– A Cisco router is running a Cisco IOS software release that has the fix for CSCds91198.
– A Cisco router is running Label Distribution Protocol (LDP) or Tag Distribution Protocol
(TDP).
– A Cisco router has static recursive routes in the global table.
– At least one prefix has two static recursive routes back to it.
– A Cisco router that is configured to use route aggregation is using Null0.
– At some point, the prefix is resolved to go over two paths. One path is over a physical interface,
and the other path is to Null0. For example, ip route x/y next hop1 ip route x/y next hop2. The
route to nexthop1 points to a physical interface, and the route to next hop 2 points (at any time)
to Null0.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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2283
Resolved Caveats—Cisco IOS Release 12.0(17)S1
This condition can be detected by entering the entering the following show commands:
– The show ip cef linecard command will show a large number of messages in the LowQ. The
large number of messages is a possible indication.
– The show memory command can help you to isolate the personal computer (PC) that is
responsible for the memory leak.
Workaround: If any of the following actions are performed, the messages will eventually drain off
(releasing memory):
– The static route that causes the path to go to Null0 is removed.
– - The recursive routes are changed to nonrecursive routes. (The next hop is configured as an
interface, instead of an IP address.)
– The static route that is causing the path to go over the physical interface is removed (This action
should be used if it does not disrupt connectivity for real traffic.)
Workaround: Performed these actions at startup.
•
CSCdu12155
The redundancy prefer slot command may not work properly on a Cisco 12012 router with dual
Gigabit Route Processors (GRPs).
Workaround: The redundancy prefer slot command may operate normally when GRPs that are of
the same type (GRP-B and GRP-B or GRP-E and GRP-E) are used together.
•
CSCdu13460
A Cisco 12000 series Internet router with an OC-192 Engine 4 line card may run out of memory
when the router receives more than 200,000 Border Gateway Protocol (BGP) and 4,000 Intermediate
System-to-Intermediate System (IS-IS) routes simultaneously.There is no workaround.
•
CSCdu17109
A Cisco 7204 router with a Network Processing Engine (NPE-200) and a PA-A2-4E1XC-E3ATM
ATM-Circuit Emulation Services (ATM-CES) port adapter that is running Cisco IOS Software
Release 12.1(5) may display the following error message:
No space for tbdP1: mp->data_block
There is no workaround.
•
CSCdu17940
After loading the gsr-p-mz.120-170ST.0504 image into a Cisco 12000 series Internet router, some
Frame Relay commands will be automatically loaded to OC-48 line cards. This condition can be verified
by entering the show running-config command or the show startup-config EXEC command for the
affected OC-48 line card.
The following output is from the show running-config command:
interface POS1/0
no ip address
no ip directed-broadcast
encapsulation frame-relay
no ip mroute-cache
crc 32
pos threshold sf-ber 4
frame-relay lmi-type ansi
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(17)S1
The following output is from the show startup-config command:
interface POS1/0
no ip address
no ip directed-broadcast
no ip route-cache
shutdown
crc 32
Workaround: Manually remove the Frame Relay commands after loading the
gsr-p-mz.120-170ST.0504 image.
•
CSCdu19229
A Cisco 7200 series Internet Router that is running Cisco IOS Software Release 12.1, 12.0S or
12.2(1) with a Dual-port Fast Ethernet 100BaseTX (PA-2FE-TX) or a Cisco 7200 Input/Output
Controller with 2 10/100 Auto-sensing Fast Ethernet Ports (C7200-I/O-2FE/E) may experience link
flaps (link line status goes up and down) when certain protocols are running on an interface. The
known triggers for the link flaps are: IP address configurations/modifications, the addition of
subinterfaces, the modification of line speeds and line states (duplex/half-duplex), and other
protocol-dependent configurations. There is no workaround.
•
CSCdu19503
When a line card experiences a high CPU processing load, some route processor to line card
messages may be lost, causing interface flaps. When the CPU spike returns to normal, the situation
should stabilize by itself. There is no workaround.
•
CSCdu21809
If multiple Traffic Engineering (TE) tunnels are starting from the same router “R” and ending on the
different routers that are all on the shortest path from “R” to the router that advertises the multicast
source S, Reverse-Path Forwarding (RPF) check will fail on “R” and all multicast traffic from source
S will be dropped on “R.”
Workaround: Configure the static mroute command to the native interface.
•
CSCdu21894
A Cisco router that resides on a network with Intermediate System-to- Intermediate System (IS-IS)
and Open Shortest Path First (OSPF) running concurrently with default administrative distances
configured may reload when the clear ip route * EXEC command or the router ospf process-id
global configuration command is entered and when a subnet prefix is shared by both IS-IS and
OSPF.
Workaround: Change the administrative distance under the router isis [tag] global configuration
command.
•
CSCdu22349
A Cisco 2600 series router configured with Service Assurance Agent (SAA) may display the
following error message:
%SYS-2-MALLOCFAIL: Memory allocation of -2132490248 bytes failed from 0x8064BDBC, pool
Processor, alignment
The memory allocation failure error message is generated when the system is repeatedly Simple
Network Management Protocol (SNMP) polled for the rttMonJitterStats table. Because of the
memory allocation error, SAA (Service Assurance Agent) data may also be unreliable. There is no
workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2285
Resolved Caveats—Cisco IOS Release 12.0(17)S1
•
CSCdu25763
A Cisco 12000 series Internet router that is running Cisco IOS Software Release 12.0(14)ST (or later
releases of Cisco IOS 12.0 ST) may reload when a labeled packet enters into a Multiprotocol Label
Switched (MPLS) enabled interface and exits through interface Ethernet 0. The following traceback
may be displayed:
%SYS-2-BADSHARE: Bad refcount in pool_getbuffer, ptr=6352FA44, count=FFFFFD06
-Traceback= 6016AC20 6016C928 600EBD68 6077E3C4 6077EF2C 6077F4B0 6077F63C 6019A 6E4
6019A6D0
There is no workaround.
•
CSCdu26591
When an administrator repeatedly enables and disables Border Gateway Protocol (BGP) routing
processes on a router with the router bgp as-number router configuration command and the no
router bgp as-number router configuration command, the system may lose memory and experience
memory corruption. This condition may cause the system to halt.
Workaround: After disabling a BGP routing process, save the running configuration and reload the
router.
•
CSCdu27111
A Cisco 12000 series Internet router that is running Cisco IOS Software Release 12.0(14)S3 with
Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) configured as a mid-point may
detect that there is not enough bandwidth available for Resource Reservation Protocol (RSVP)
interfaces. The system has incorrectly detected the lack of bandwidth. However, the bandwidth is
still unusable by the system. There is no workaround.
•
CSCdu27143
The following Cisco IOS software releases (and later releases) will cause a Cisco router to reload
when the copy EXEC command is entered with a nonexistent ATA sandisk specified as the
destination:
– Cisco IOS Software Release 12.0(16.05)S
– Cisco IOS Software Release 12.0(16.05)ST
– Cisco IOS Software Release 12.1(6.05)E1
– Cisco IOS Software Release 12.1(6.05)EC1
– Cisco IOS Software Release 12.1(8.01)
– Cisco IOS Software Release 12.2(0.18)
– Cisco IOS Software Release 12.2(0.18)S
– Cisco IOS Software Release 12.2(0.18)T
– Cisco IOS Software Release 12.2(0.19)PI
Workaround: Do not specify a nonexistent ATA sandisk destination when entering the copy EXEC
command.
•
CSCdu27273
When attempting to disable Cisco Express Forwarding (CEF) with the no ip route-cache cef
interface configuration command on a Gigabit Route Processor (GRP) with CEF enabled on
interface Ethernet 0, the following error message may be displayed:
%Disabling CEF not supported for Ethernet0
There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2286
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Resolved Caveats—Cisco IOS Release 12.0(17)S1
•
CSCdu27930
On a Cisco 12000 series Internet router, a 12-E3 output byte counters may be incorrect when there
is an output drop (similar to using a subrate) because an average packet size is used to calculate the
output drops. The counters are correct when there is no output drop, and the input counters are not
affected by this condition. This condition displays two incorrect output statistics:
– The output packet count does not show the dropped packets.
– The output byte count is incorrect.
Incorrect output rates have been observed during packet size testing. The rates are calculated by
polling Simple Network Management Protocol (SNMP) octets. Under normal traffic conditions, the
difference is minimal. There is no workaround.
•
CSCdu29450
A Cisco 12410 series Internet router or a Cisco 12406 series Internet router may not report a five
volt power supply alarm. There is no workaround.
•
CSCdu31631
An ingress Engine 4 line card on a Cisco 12000 series Internet router does not switch multicast
packets to an egress Engine 4 line card when the output list includes an Engine 0 or Engine 1 line
card. There is no workaround.
•
CSCdu32097
If the startup configuration is missing on a Cisco router that is running Cisco IOS Software Release
12.0(16)S or Cisco IOS Software Release 12.0(17)S, entering the redundancy force-failover
command may change the host name from “Router” to “GRP-SlotX” (X is the slot number of the
affected GRP). This condition has not been observed with Cisco IOS Software Release 12.0(14)S.
There is no workaround.
•
CSCdu32374
Disabling Cisco Express Forwarding (CEF) inconsistency checkers with the no ip cef table
command may result in CEF being disabled. To reenable CEF, globally configure the ip cef
command or ip cef distributed command. There is no workaround.
•
CSCdu35337
It may not be possible to configure the speed of a PA-2FE-TX on a Cisco 7500 series router that is
running Cisco IOS Software Release 12.0 S or 12.0 ST. There is no workaround.
•
CSCdu33529
When a router interface is administratively shut down the switch or other connecting device will still
show the router as connected when it is not. This problem exists only on certain port adapters
(PA-2FE-TX, PA-2FE-FX, and PA-4E).
Workaround: Physically disconnect and reconnect the cable between the devices to force both sides
of the link down.
•
CSCdu36136
A Spacial Reuse Protocol (SRP) port adapter may not recover gracefully from a data parity error on
the PCI bus. This condition may cause the SRP port adapter to remain unstable until an online
insertion and removal (OIR) or a router reload is performed.
Workaround: Perform an OIR or reload the router.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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2287
Resolved Caveats—Cisco IOS Release 12.0(17)S
•
CSCdu40609
An output Access Control List (ACL) that is configured on an Engine 2 line card will not filter traffic
for ACL lines that specify a protocol other than TCP, User Data Protocol (UDP), Internet Control
Message Protocol (ICMP), Internet Group Management Protocol (IGMP), or IP. There is no
workaround.
•
CSCdu41117
A Cisco 12000 series Internet router with an Engine 4 line card may stop forwarding traffic and
reload under certain circumstances. There is no workaround.
•
CSCdu43315
In a configuration in with multiple T1 through T3 interfaces, it may not be possible to query for
Simple Network Management Protocol (SNMP) statistics because the snmpwalk and snmpget
functions do not display data for some interfaces. There is no workaround.
Resolved Caveats—Cisco IOS Release 12.0(17)S
All the caveats listed in this section are resolved in Cisco IOS Release 12.0(17)S. This section describes
only severity 1 and 2 caveats.
Basic System Services
•
CSCdm71776
If the slave auto-sync config global configuration command is enabled on a High System
Availability (HSA) system and you enter the config-register global configuration command
followed by the write memory command, the master system configuration register will be set to
change on the next reboot, but the slave configuration register will not be set to change.
Workaround: Enter the slave sync config privileged EXEC command, which will update the slave
configuration register for the next reboot.
•
CSCdp03448
When ISDN calls are brought up on a Cisco router that has ISDN traps configured, memory leaks
will occur in the Simple Network Management Protocol (SNMP) trap process. In addition, some
ISDN traps will be lost because of the invalid variable bindings (varBinds) that cause the leaks.
Workaround: Remove all snmp-server enable traps [isdn] global configuration commands from
the router.
•
CSCdr16320
High capacity counters in the IF-MIB ifXTable display 0 for all interfaces that do not support them.
There is no workaround.
Interfaces and Bridging
•
CSCdt19788
A Cisco 7206VXR router with an NPE-300 Network Processing Engine, an enhanced ATM
PA-OC-3 port adapter, and some ATM subinterfaces may intermittently experience a situation in
which the ATM permanent virtual circuit (PVC) at one subinterface starts dropping the packets from
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(17)S
the output queue. Cisco Express Forwarding (CEF) and fast switching are not being used in this
situation. The PVC stays up and transmits the traffic originated by the Cisco 7206VXR that is not
experiencing this situation.
Workaround: Re-enter the atm pvc interface configuration command on the ATM subinterfaces.
•
CSCdt48514
A Cisco router may fail to execute Serial Line Address Resolution Protocol (SLARP) when a new
router is connected to an existing router through a serial port adapter. There is no workaround
•
CSCdt89527
After a router is reloaded, there may not be any connectivity between the serial interfaces that have
channel-groups configured.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration commands to restore connectivity between the serial interfaces.
IP Routing Protocols
•
CSCdt43936
When a Cisco router is redistributing Enhanced Interior Gateway Routing Protocol (EIGRP) into
OSPF, and EIGRP has more than one successor, it is possible that a change in the feasible successor
(EIGRP) does not generate the OSPF external link-state advertisement (LSA).
Workaround: Enter the clear ip ospf redistribution EXEC command.
•
CSCdt48480
A filter list may deny a path incorrectly.
Workaround: Restart the Border Gateway Protocol (BGP) process.
•
CSCdt59583
When multicast video traffic is coming in through the Frame Relay interface on the router and going
out of the ATM LANE interface at approximately 600 kbps, the router may reload after
approximately 18 hours because of no memory. This situation has been observed where there is no
ATM address configured on the interface. The incomplete configuration causes a memory leak.
Workaround: Remove IP PIM configurations under the ATM LANE interface.
•
CSCdt66933
OSPF summary redistribution may not function properly. After the clear ip ospf redistribution
EXEC command and the show ip ospf database external EXEC command have been entered, the
link-state age reaches “MAXAGE” and does not come up again. This condition has been observed
only when the router is configured with the summary-address number command under OSPF and
is also configured to have a static route that matches the same summary address. There is no
workaround.
•
CSCdt90054
A Cisco 7500/RSP series router that is running Cisco IOS Release 12.0(15)S1 and that has a
Versatile Interface Processor 2-50 (VIP2-50) and an ATM-PA-A3 port adapter might display the
following error message on the Route Switch Processor (RSP) console if the VIP is running at
99 percent utilization:
%ATM-3-FAILCREATEVC: ATM failed to create VC(VCD=23, VPI=0, VCI=96) on Interface
ATM4/1/0, (Cause of the failure: Failed to have the driver to accept the VC)
Cross-Platform Release Notes for Cisco IOS Release 12.0S
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Resolved Caveats—Cisco IOS Release 12.0(17)S
Possible Workarounds:
– Disable distributed Cisco Express Forwarding (dCEF).
– Enter the shutdown interface configuration command followed by the no shutdown interface
configuration command on the ATM interface.
•
CSCdu12698
A router that has the ip multicast boundary access-list-number interface configuration command
configured on an interface may reload when the access list is defined. There is no workaround.
ISO CLNS
•
CSCdt97590
If a Layer 2-only interface goes down on a Cisco router that is running the Intermediate
System-to-Intermediate System (IS-IS) protocol, and if that router is using route leaking to
redistribute the network on that interface into Layer 1, the network might not be removed from the
Layer 1 link-state packet (LSP) on that router.
Workaround: Enter the clear ip route {*} EXEC command. The LSP should be properly
regenerated.
Miscellaneous
•
CSCdr46528
A Cisco 12000 series Internet router with a significant number of packets that are destined for a
“Null0” route may experience poor forwarding performance. This is not a common configuration.
There is no workaround.
•
CSCds05414
On a Cisco 7513 router, packet drops have occurred on all PRI interfaces that are PA-MC-4C T1
interfaces. The rate of the drop is one packet for every two packets. There is no workaround.
•
CSCds15443
When a Cisco router acts as a tag switching edge router, the router will sometimes stop running Tag
Distribution Protocol (TDP) after a reboot.
Workaround: Enter the shutdown interface configuration command followed by the no shutdown
interface configuration command. If this action does not resolve the issue, then reboot the router
again.
•
CSCds22213
A Cisco 12000 series router with a Gigabit Ethernet/Fast Ethernet output interface may experience
a tag fragmentation problem if the maximum transmission unit (MTU) size on the input interface is
larger than the MTU on the output interface. This problem does not occur when the MTU sizes are
the same on both the input and the output interfaces. There is no workaround.
•
CSCds35017
A Cisco 12000 series Internet router might reload when a map list entry that was just configured is
reconfigured. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2290
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S
•
CSCds56409
When packets are forwarded over a generic routing encapsulation (GRE) tunnel with Cisco Express
Forwarding (CEF) and NetFlow enabled, NetFlow egress records are not created. This situation does
not match fast switching behavior. There is no workaround.
•
CSCds71124
When a Cisco router has IP tunnels configured, it is possible for a series of the tunnels to form a
loop as follows:
Tunnel
Output i/f
Tunnel A
Tunnel B
Tunnel B
Tunnel C
Tunnel C
Tunnel A
This situation will cause an infinite stack recursion when a packet gets switched because of the
recursive route lookups. Eventually this situation will cause the stack to overflow and the router to
reload.
Workaround: Configure static routes for the tunnel destinations.
•
CSCdt01089
The following error message may be displayed during a Route Processor (RP) failover:
SEC 1:00:25:34: %IPCGRP-3-SEATERR: Can not find card by seat id (131178)
-Traceback= 601BCB0C 60299460 6017562C 60175618 00:25:34:
%IPCGRP-3-SEATERR: Can not find card by seat id (5)
-Traceback= 601BCB0C 60299460 601756.
There is no workaround.
•
CSCdt01239
Under certain conditions, a Cisco 12000 series Internet router may experience the following line
card error messages:
FIB-4-FIBXDRINV: Invalid format. NDB has bogus routecount FIB-4-FIBXDRINV: Invalid
format. RDB length wrong
The following factors make the problem occur more frequently:
– IP fragmentation.
– Output Committed Access Rate (CAR).
– Frequent routing flaps.
There is no workaround.
•
CSCdt01950
A Cisco 12008 router may display the following error message:
00:04:54.619 JST: %SYS-2-LINKED: Bad enqueue of 61BA5BA0 in queue 623E1F04 -Process=
"MBUS System", ipl= 6, pid= 8 -Traceback= 6019C628 6019A368 601EB8A0 601FB178 6021CA5C
60186414 60186400 022121: Dec 7 00:04:54.635 JST: %SYS-2-LINKED: Bad enqueue of
61BA5BA0 in queue 623E1F04 -Process= "MBUS System", ipl= 6, pid= 8 -Traceback=
6019C628 6019A368 601EB8A0 601FB178 6021CA5C 60186414 60186400
There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2291
Resolved Caveats—Cisco IOS Release 12.0(17)S
•
CSCdt05020
A Versatile Interface Processor 2-50 (VIP2-50) with two PA-2CT1/PRI channelized port adapters
may reload when the rsp-a3jsv-mz.122-0.2 image is loaded. There is no workaround.
•
CSCdt08679
Changing the policy map configuration during high traffic may cause an “output stuck” error. In this
situation, the Versatile Interface Processor (VIP) may stop forwarding packets until it is reset
automatically. This condition is specific to Frame Relay configurations in which there are permanent
virtual connections (PVCs) that are shaped using distributed Traffic Shaping (dTS), and it has been
observed when all the PVCs are congested and a change is made to the policy map.
Possible workaround: Shut down the physical interface before changing the policy map, and then
reenable the interface.
•
CSCdt09061
When multicast is configured on a Cisco 12000 series Internet router Gigabit Ethernet (GE) line
card, the following error message might be displayed:
%LC-3-BMACMDRPLY:Problem in BMA reply to command type 128 FrFab BMA sequence no=18
There is no workaround.
•
CSCdt27923
Reloading a Cisco 12000 series Internet router after a Cisco IOS software upgrade may cause some
line cards to not boot correctly when the upgrade all slot slot-number command is entered, and
“MBus agent downloading” errors are received. There is no workaround.
•
CSCdt28356
Forced drops on the egress interface of an oversubscribed OC-192 or Quad OC-48 line card may not
be counted as drops, and forced drops on an oversubscribed tofaq queue on an OC-192 or Quad
OC-48 line card may not be counted as ignored. There is no workaround.
•
CSCdt32871
A router that is configured for Layer 2 Tunneling Protocol (L2TP) may experience an excessive level
of CPU utilization. There is no workaround.
•
CSCdt34404
A Cisco 12000 series Internet router that is running policy-based routing may experience spurious
interrupts. Policy-based routing may also cause the line card to reload.
Workaround: Remove policy-based routing from all interfaces.
•
CSCdt36867
An OC-192 or Quad OC-48 line card may reload if an error interrupt is received from custom
application-specific integrated circuits (ASICs). There is no workaround.
•
CSCdt42256
A Cisco router that is running Distributed Multilink PPP (DML-PPP) may experience approximately
13 percent packet drops with Internet Mix (IMIX) traffic when traffic is moving at the line rate.
There is no workaround.
•
CSCdt45094
A Cisco Gigabit Route Processor (GRP) may reload in a loop after failover because of memory
corruption. This situation occurs when there are two GRPs. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2292
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S
•
CSCdt45363
In a Multiprotocol Label Switching (MPLS) environment, Engine 2 performance
Packet-over-SONET (POS) line cards for the Cisco 12000 series Internet router may not accurately
update a Command Line Interface (CLI) change in the maximum transmission unit (MTU). This
condition may result in fragmentation test failures.
Workaround: Perform a microcode reload on the line card.
•
CSCdt47217
A Cisco 12012 Internet router that is running Cisco IOS Release 12.0(7.3)S and has an OC-48/STM
16 line card may experience a situation where signal degrade (SD) alarms on the working and/or
protect APS interfaces never clear. In this situation, traffic is switched to the other interface of the
APS pair, and line protocol remains down on the interface showing the SD alarm. This is a very rare
error.
Workarounds:
1. Deconfigure APS from the interface showing the false SD.
2. Shut down the protect interface
Note
Under the first two workarounds, no APS protection will be available
3. Reboot the router containing the interface showing the false SD.
4. Pull and replace the fiber from the interface showing the false SD.
•
CSCdt51427
When a 3-Port Gigabit Ethernet line card on a Cisco 12000 series Internet router is configured for
Hot Standby Router Protocol (HSRP) and the Internet router takes over as the active router, the
HSRP address may not be pingable but the interface address will be pingable.
Workaround: Enter the standby group-number use bia command.
•
CSCdt51748
A Packet-over-SONET (POS) interface in a Cisco 12000 router may experience B3 alarms but will
remain in a link-up state even when path triggers are enabled. There is no workaround.
•
CSCdt51864
OC-192 Packet-over-SONET (POS) and Quad OC-48 POS line cards can only support 200,000
Border Gateway Protocol (BGP) routes, 4,000 Interior Gateway Protocol (IGP) routes (such as
Intermediate System-to-Intermediate System [IS-IS]), and a maximum of 2,000 adjacencies. There
is no workaround.
•
CSCdt53611
A Cisco 12000 series router may toggle repeatedly between Redundant and non Redundant modes
when there is a faulty clock switch card (CSC) in the fabric clock. There is no workaround.
•
CSCdt56314
A Cisco 12000 series router with Engine 2 line cards may exhibit high line card CPU utilization for
the Cisco Express Forwarding (CEF) CEF Interprocess Communication (IPC) Background process
when there is a large number of load sharing entities on the Cisco Express Forwarding (CEF) table.
The process CEF IPC Background may run continuously attempting to drain the large queue created.
Workaround: Disable the Border Gateway Protocol (BGP) multipath and the Interior Gateway
Protocol (IGP) multipath.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2293
Resolved Caveats—Cisco IOS Release 12.0(17)S
•
CSCdt56915
A Cisco 3620 router that is running Cisco IOS Release 12.1(5.3)T may reload because of a bus error
after it runs out of memory because of a memory leak that occurs when it is accessing the following
MIB counters:
– cbQosMarkingFeature
– cbQosPolicyMapName
– cbQosPolicyMapDesc
– cbQosCMName
– cbQosCMDesc
– cbQosMatchStmtName
There is no workaround.
•
CSCdt58055
A 3 Gigabit Ethernet line card on a Cisco 12000 series router that is running Cisco IOS
Release 12.0(15)S1 may experience a loss of connectivity. The interfaces will remain in an up/up
state. Packets continue to be received and the counters continue to be incremented even though they
are not processed.
The following messages are displayed when the line card is inserted:
%GENERAL-3-EREVENT1: PSA pipeline stuck, status 0x812490 -Traceback= ...
%LC-3-PSAERRS: PSA PSA_CPU_IF_INT error 100
%LC-3-PSAERR: PSA error: if_err 100 adr FC00002C cmd 5 data 0 pipe 0,fs 0,prep 0 (pc
D5),pop 0 (pc 1E8),plu 0,tlu 0,plu sdram 0 adr 0 synd 0 check 3400,tlu sdram 0 adr 0
synd 0 check B700,ssdram 0 adr 0,gather 0,pl 2812490,plmuxcnts 66,pludsr 0
%GSR-3-INTPROC: Process Traceback= ... SLOT 3:Feb 27 18:01:32.662:
%LC-3-BMAERRS: ToFab BMA BMA error status error 1 SLOT 3:Feb 27 18:01:32.662:
%LC-3-BMAERRS: ToFab BMA PLIM error 2000
Primary Workaround: Enter the no access-list hardware command followed by the access-list
hardware psa command. After these two commands are entered, the Engine 2 line cards will reload.
You can rely on this workaround if you do not encounter any packet loss after the entering the first
command. Use the second workaround instead if you encounter any packet loss after entering the
first command.
Secondary Workaround: Run Cisco IOS Release 12.0(14)S.
•
CSCdt59721
A Cisco 7513 router may fail to recognize more than 13 Inverse Multiplexing over ATM (IMA) port
adapters (IMA-PAs). This problem occurs when attempts are made to install a fourteenth IMA-PA
on the router. There is no workaround.
•
CSCdt61322
When multiple multilink Point to Point Protocol (PPP) bundles are configured with Class-Based
Weighted Fair Queueing (CBWFQ), all PPP bundles except for the first one, are dropped. This
symptom occurs even when light to moderate loads are handled. There is no workaround.
•
CSCdt62624
A Cisco 7500 series router that is running Cisco IOS Release 12.0(14)S1 with a BLIZZARD
channelized T3 port adapter card (CT3) may stop forwarding traffic on individual T1 channels. This
symptom is only seen when the T1 channel is connected to an Fast Serial Interface Processor (FSIP)
adapter. There is no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
2294
OL-1617-14 Rev. Q0
Resolved Caveats—Cisco IOS Release 12.0(17)S
•
CSCdt64782
After the power-on sequence on a Cisco 12012 series Internet router, alarms may be seen on the
power supply unit (PSU) and blower units, and Critical, Major, and Minor LEDs may be seen on the
alarm card. These conditions typically clear between 30 seconds and 5 minutes after the Route
Processor (RP) has completed booting. Normal operation continues after the alarms have been
cleared. This situation has not been seen on Cisco 12008 or 12016 Internet routers. There is no
workaround.
•
CSCdt65101
On a Cisco 12000 series Internet router, when both the pos scramble-atm interface configuration
command and the pos flag c2 207 interface configuration command are configured on a
Packet-over-SONET (POS) interface, the pos flag c2 207 command does not appear in the
configuration. The pos c2 flag reverts to 22 (0xCF) when the router is reloaded. There is no
workaround.
•
CSCdt70225
When OC-192 or Quad OC-48 line cards are connected back-to-back, Frame Relay subinterface
encapsulation does not function properly with Intermediate System-to-Intermediate System (IS-IS).
IS-IS cannot exchange routes across the link. This situation does not occur with OSPF. There is no
workaround.
•
CSCdt70242
Engine 2 and Engine 4 line cards that are configured with multiple interfaces running multicast may
experience performance problems.
Workaround: Remove output Access Control Lists (ACLs) on interfaces which have multicast
enabled.
•
CSCdt70875
On a Cisco 12000 series Internet router, an Engine 2 OC-48 line card may reload with the following
error message:
%LCPOS-3-SOP: RX:UnexpectedEop. Source=0x20 (Framer), halt_minor0=0x40
There is no workaround.
•
CSCdt70960
A Cisco 7206 VXR router that is equipped with a Cisco 7200 Input/Output Controller with two Fast
Ethernet Ports (C7200-I/O-2FE/E) or one Gigabit Ethernet and one Ethernet Port
(C7200-I/O-GE+E) or a 2-Port Fast Ethernet Port Adapter (PA-2FE-TX, PA-2FE-FX) may
experience traffic shaping problems with Fast Ethernet Ports.
Workaround: Check to make sure that the Committed Access Rate (CAR) is sufficient.
•
CSCdt71222
Applying a committed access rate (CAR) rule to a Quad OC-48 Packet-over-SONET (POS) interface
may cause the rate-limit counters to increment without sending traffic.
Workaround: Clear the counters after configuring the CAR rules. Note, however, that this action also
clears previous rate-limit statistics.
•
CSCdt76725
A router may stop forwarding traffic larger than the configured maximum transmission unit (MTU)
size after the MTU size for the OC-12c Dynamic Packet Transport Port Adapter is altered. There is
no workaround.
Cross-Platform Release Notes for Cisco IOS Release 12.0S
OL-1617-14 Rev. Q0
2295
Resolved Caveats—Cisco IOS Release 12.0(17)S
•
CSCdt77617
On a Cisco 12000 series Internet router with a 6-port channelized T3 (6CT3-SMB) line card, a new
channel group may assume the tx-cos configuration left behind by a previously configured channel
group when the channel group that was previously configured with the tx-cos name interface
configuration command is deleted and another channel group is created.
Workaround: Be sure to check the running configuration after an interface is added and remove the
tx-cos assignment by entering the no tx-cos cos-queue-group name interface configuration
command.
•
CSCdt77864
A Cisco 12000 series router that has a 6-port channelized T3 (6CT3-SMB) line card interface may
experience a memory leak when the user attempts to install and uninstall a transmit buffer memory
(Frfab) Weighted Random Early Detection (WRED) on the interface. There is no workaround.
•
CSCdt80914
Entering the show ip cef exact-route command at the head-end of a Multiprotocol Label Switching
(MPLS) Traffic Engineering (TE) tunnel may cause the Route Processor (RP) in a Cisco 12000
series Internet router or a Cisco 7500/RSP series router to reload. This situation occurs when the
destination prefix is recursive, and the router is load sharing to the next hop. There is no workaround.
•
CSCdt84938
On a Cisco 12000 series Internet router that is running Cisco IOS Release 12.0(16)S, the 2x32-bit
Simple Network Management Protocol (SNMP) counters on the main interface may not function
properly. The same counters for the subinterface are not affected. There is no workaround.
•
CSCdt85730
When Multiprotocol Label Switching (MPLS) is configured on a Cisco 12000 series Internet router
that is running Cisco IOS Release 12.0(15)S2 and the router is performing label imposition for
flowing from an Engine 4 line card to an Engine 1 line card, the Engine 1 line card may reload. There
is no workaround.
•
CSCdt87752
When the CPU is busy and has no resources to process an Open Shortest Path First (OSPF) protocol
message, the OSPF neighborhood may collapse. There is no workaround.
•
CSCdt88568
A Versatile Interface Processor (VIP) may reload when a service policy is attached to an interface
while traffic is flowing through the interface.
Workaround: St