Download 20070717-verrant

Dynamic Lightpaths in R&E Networks
July 17, 2007
Jeff Verrant
Agenda
What is a Dynamic Light Path?
And Why?
Technology Requirements
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A New Networking Model
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A New Networking Model
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A New Networking Model
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Layers : Dynamic Connections are not just wavelengths
Layer 1 : Wavelength Switching
Map an application directly onto a 10G wavelength
Dynamically provision and switch the lightpath
Layer 2 : vlan / ethernet – gfp – vcg / sonet ( OTN )
50M – 10G, increments of 50M
Apply push / pop vlan switching
No stranded bandwidth
Dynamic provisioning, dynamic sizing
Layer 2.5 - 3 : MPLS / ip switching
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Wavelength Switching
Any channel from any node, to any node
Remote provisioning of wavelength route
Simplifies maintenance activities
Improve stability, reliability and
traceability by removing “fingers” from
the network
Accelerates rollout velocity
Quickly re-route existing service
Simplifies network planning
No stranded wavelengths
Safegaurds upgrade capacity
Extends life of network
Limited need for accurate node-by-node
capacity projections
OpEx and CapEx savings
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Layers : Dynamic Connections are not just wavelengths
Layer 1 : Wavelength Switching
Map an application directly onto a 10G wavelength
Dynamically provision and switch the lightpath
Layer 2 : vlan / ethernet – gfp – vcg / sonet ( OTN )
50M – 10G, increments of 50M
Apply push / pop vlan switching
No stranded bandwidth
Dynamic provisioning, dynamic sizing
Layer 2.5 - 3 : MPLS / ip switching
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Research Networks
The Need for Flexible Lightpaths
Connectivity
Requirements
Guaranteed
Deterministic
Bandwidth (10s
Mbps – 10Gbps+)
Mulitple
Communities of
Interest
200Mb
ScheduledDemand
Bandwidth; Hours,
Days, Weeks
500Mb
10Gb
10Mb
SDH / IP/ Ethernet
1Gb (FC)
Low Latency
Data
Replication
Scarce Resources
Multi-site
correlation
High Availability
Data Collection
Data Crunching
Data Storage
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Globalisation is a Reality
Global, Multi-Domain
Connectivity
Service definition
across Protocol
boundaries
Service Creation
across domains
200Mb
10Gb
SDH
Data Collection
Network Element
Interworking
functions
10Mb
MPLS
Data Crunching
SONET
Data Storage
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Internet2 Dynamic Circuit Services (DCS)
I2 HOPI: Force10 E600
10 Gigabit Ethernet
10 Gigabit Ethernet
1 Gigabit Ethernet
I2 DCS: Ciena CoreDirector
10 Gigabit Ethernet
OC192 SONET/SDH
1 Gigabit Ethernet
or SONET/SDH
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Integration : Core Director Domain into the End-to-End
Signaling
VLSR
uni-subnet
signaling flow
data flow
CoreDirector
LSR
upstream
LSR
downstream
CoreDirector
Ciena Region
CD_a
subnet signaling flow
CD_z
Signaling is performed in contiguous mode.
Single RSVP signaling session (main session) for end-to-end circuit.
Subnet path is created via a separate RSVP-UNI session (subnet session), similar to using SNMP/CLI
to create VLAN on an Ethernet switch.
The simplest case: one VLSR covers the whole UNI subnet.
VLSR is both the source and destination UNI clients.
This VLSR is control-plane ‘home VLSR’ for both CD_a and CD_z.
UNI client is implemented as embedded module using KOM-RSVP API.
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Graphical User Interface
Monitoring and Control
Ciena Core Director
“NodeManager”
Timeslot Map
Network Utilization Monitor
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Optical Transport Network (OTN)
ITU Standards G.709 “Digital Wrapper”, G.872, G.873.1
Defines line/muxing rates, Optical Transport Unit (OTU)
ODU-1/2/3 payload in OTU-1/2/3 = 2.5/2.7Gbps, 10/10.7Gbps, 40/43.0Gbps
OTU-2 supports 10GbE LAN PHY (Extensions to include Preamble, Over-clocked for IFG)
OTN & SONET/SDH share same foundation
Similar framing with addition of OTN FEC
Powerful OA&M capabilities (GCC0 akin to DCC)
Asynchronous and Transparent
Services with different clock sources integrated side-by-side
Secure; Client OAM channels maintained
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Overhead
for
OA&M
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FAS OTU
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ODU
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O
P
U
Traffic Payload
Client Payload
3824 3825
4080
FEC
Forward
Error
Correction
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FAS: Frame Alignment Signal
OTU: Optical Transport Unit
ODU: Optical Data Unit
OPU: Optical Payload Unit
Evolution of the Client-Server Network
IP
TDM
Voice
IP
SONET/SDH is
Managed Transport
“Server” layer for
existing service
“clients”
Alien
Wavelengths
IP
IP
Ethernet
ESCON
TDM
PL
FC
ATM
SONET
/SDH
IP builds over WDM
Ethernet
… so does Ethernet
… and ESCON, FC,
l services
OTN
WDM augments
SONET/SDH capacity
WDM
WDM
OTNisprovides
now an unmanaged
the necessary
network
Managed
“Server”
Transparent
to many
transport “Clients”
Service for
(which
all Transport
now includes
Clients
SONET/SDH)
Animated Slide
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Emergence of Connection Oriented Ethernet
IP
IP
TDM
Voice
IP
Driven by Demand for
packet focused
replacement of SDH
Alien
Wavelengths
IP
Ethernet
ESCON
TDM
PL
Robust as SDH
FC
Less Complex than
MPLS
ATM
Less Costly than
either
SONET
/SDH
Connection oriented for
deterministic B/W
COE*
Disable MAC
learning,
Broadcast
Unknown, STP
OTN
Explicit Paths and
CAC for
guaranteed QoS
and Restoration
WDM
High Availability
Transparent L2
Aggregation
Mux Efficiency
*COE: Connection-oriented Ethernet
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Thank You!