Download OSPF Single Area

OSPF (Open Shortest Path First)
Single Area Configuration and Testing
By
Nur Wajianto
Collinsvile, Brisbane QD May 15 2007
Link State Routing Protocols
Link-state routing protocols are also known as
shortest path first protocols and are built around
Edsger Dijkstra's shortest path first (SPF)
algorithm. There are two link-state routing
protocols for IP :
 OSPF(Open Shortest Path First)
 IS-IS(Intermediate-System-to-IntermediateSystem)
2
Advantages of a Link State Routing
Protocol
 Each router builds its own topological map of
the network to determine the shortest path
 Immediate flooding of LSPs achieves faster
convergence
 LSPs are sent only when there is a change in
the topology and contain only the information
regarding that change
 Hierarchical design used when implementing
multiple areas
3
Basic Configuration and Goals





Set the host name, and bring up the interfaces
Configure the OSPF routing protocol
Select the directly connected networks
Display the routing table
Display the OSPF protocol information
4
Configure Routers as the figure below
5
Verify that each router can ping its
directly connected neighbors
Queensland#ping 10.1.1.2
Queensland#ping 192.168.100.6
Darwin#ping 10.1.1.1
Adelaide#ping 192.168.100.5
6
Add OSPF to Queensland use the
Process ID number 100
Queensland#config terminal
Queensland(config)#router ospf 100
Queensland(config-router)#network
10.1.1.0 0.0.0.255 area 0
Queensland(config-router)#network
192.168.100.4 0.0.0.3 area 0
7
Add OSPF to Darwin use the
Process ID number 100
Darwin#config terminal
Darwin(config)#router ospf 100
Darwin(config-router)#network
10.1.1.0 0.0.0.255 area 0
8
Add OSPF to Adelaide use the Process
ID number 100
Adelaide#config terminal
Adelaide(config)#router ospf 100
Adelaide(config-router)#network
192.168.100.4 0.0.0.3 area 0
9
Test OSPF Routing
OSPF should now be running on all three routers.
Press CTRL+Z to exit to privileged mode, and
can ping non-directly connected routers. From
Darwin, and now be able to ping Adelaide’s serial
0 interface.
Darwin#ping 192.168.100.6
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.100.6, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 62/62/63 ms
10
Test OSPF Routing
Connect to Adelaide and ping Darwin’s serial 1
interface. If can ping on both devices, mean its
correctly configured routing and otherwise
Adelaide#ping 10.1.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.1.1.2, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 62/62/63 ms
11
Display the routing table on
Darwin’s Router
Darwin#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
C
O
10.0.0.0/24 is subnetted, 1 subnets
10.1.1.0 is directly connected, Serial1/1
192.168.100.0/30 is subnetted, 1 subnets
192.168.100.4 [110/1562] via 10.1.1.1, 00:16:14, Serial1/1
12
Display the Specific IP Routing Protocol
Information on Darwin’s Router
Darwin#show ip protocols
Routing Protocol is "ospf 100"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Router ID 10.1.1.2
Number of areas in this router is 1. 1 normal 0 stub 0 nssa
Maximum path: 4
Routing for Networks:
10.1.1.0 0.0.0.255 area 0
Routing Information Sources:
Gateway
Distance
Last Update
10.1.1.1
110
00:17:05
Distance: (default is 110)
13
Display the OSPF Database on
Darwin’s Router
Darwin#show ip ospf database
OSPF Router with ID (10.1.1.2) (Process ID 100)
Router Link States (Area 0)
Link ID
10.1.1.2
192.168.100.5
192.168.100.6
ADV Router
10.1.1.2
192.168.100.5
192.168.100.6
Age
1228
1072
1072
Seq#
0x80000002
0x80000008
0x80000002
Checksum
0x00e13b
0x00940b
0x00ab5d
Link count
2
4
2
14
Display the all of IP OSPF Neighbors
Darwin#show ip ospf neighbor
Neighbor ID
192.168.100.5
Pri
0
State
FULL/
-
Dead Time
00:00:33
Address
10.1.1.1
Interface
Serial1/1
Darwin#show ip ospf interface
Serial1/1 is up, line protocol is up
Internet address is 10.1.1.2/24, Area 0
Process ID 100, Router ID 10.1.1.2, Network Type POINT-TO-POINT, Cost: 781
Transmit Delay is 1 sec, State POINT-TO-POINT, Priority 0
No designated router on this network
No backup designated router on this network
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:09
Index 1/1, flood queue length 0
Next 0x0(0)/0x0(0)
Last flood scan length is 1, maximum is 1
Last flood scan time is 0 msec, maximum is 0 msec
Neighbor Count is 1 , Adjacent neighbor count is 1
Adjacent with neighbor 192.168.100.5
Suppress hello for 0 neighbor(s)
15
Thank You For Your Attention
Ask and Question
16