IETF 83 March 2012 Dave Allan Tae sik Cheung Ping Pan Contributors Andrew Malis Verizon Daniel King Old Dog Consulting Eric Osborne Cisco Fei Zhang ZTE Jeong ID: 247685
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Slide1
Support Shared Mesh Protection in MPLS-TP
IETF 83
March,
2012
Dave
Allan
Tae-
sik
Cheung
Ping PanSlide2
Contributors
Andrew Malis (
Verizon)
Daniel King (Old Dog Consulting)Eric Osborne (Cisco)Fei Zhang (ZTE)Jeong-dong Ryoo (ETRI)Mohana Singamsetty (Tellabs)Ping Pan (Infinera)Yaacov Weingarten (NSN)
Biao Lu (Infinera)Dave Allan (Ericsson)Fatai Zhang (Huawei)Gregory Mirsky (Ericsson)Luyuan Fang (Cisco)Nurit Sprecher (NSN)Rajan Rao (Infinera)Sam Aldrin (Huawei)Tae-sik Cheung (ETRI)
IETF 83
2Slide3
What is Shared Meshes Protection (SMP)?
IETF 83
3
The resources on P-Q-R is shared
by multiple working LSP’sKey properties:Setup protecting LSP’s ahead of timeAll protection related information are pre-computed and loaded to the relevant nodes Upon failure,
use Linear Protection mechanism in switching-over trafficSMP protocol may be required to coordinate the
usage
of
shared resources
W1
W2
P1
P2Slide4
Background
This is an important function in long-haul transport networks
Multiple parties have been working on it for a long while
There exists several drafts:draft-allan-spme-smp-fmwkdraft-cheung-mpls-tp-mesh-protection-05draft-pan-shared-mesh-protection-04Lack of information to chart a path forwardIt’s to everybody’s interest to consolidateIETF 83
4Slide5
What we have to work with
Existing Requirements: MPLS-TP Requirements (RFC5654)
[
Req 68]: MPLS-TP SHOULD support 1:n (including 1:1) shared mesh recovery.[Req 69]: MPLS-TP MUST support sharing of protection resources such that protection paths that are known not to be required concurrently can share the same resources.Which is a bit thin….IETF 835Slide6
The Plan
Framework and requirements
SMP
Mechanisms and ProceduresIETF 836Slide7
Detail
Define
requirements in substantially more
detailwhat is the problem (business priority not application priority)preemption behaviorrole of actorswhat restrictions are unacceptableDetermine if protocol work is neededIf protocol work is needed, we will converge on a common solution
IETF 807Slide8
SMP Example
IETF 83
8
Protection
Segment
Protection
Segment
SMP
mechanism coordinates
the usage of all the shared resources on the protection
LSPs
There could be multiple requests contenting on the same
resources
?Slide9
Summary
Shared Mesh Protection is an important function in TP-enabled transport networks
Will work together on
Detailed requirements and frameworkSubsequently, we will work onState machineAny necessary messaging protocolsIETF 839