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MPLS-TP Shared Mesh Protection

MPLS-TP Shared Mesh Protection. IETF 82 – Taipei, November 2011 Authors of draft-cheung-mpls-tp-mesh-protection Authors of draft-pan-shared-mesh-protection. Solutions under Discussion. Draft- cheung - mpls - tp -mesh-protection Taesik Cheung and Jeong -Dong Ryoo (ETRI)

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MPLS-TP Shared Mesh Protection

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  1. MPLS-TP Shared Mesh Protection IETF 82 – Taipei, November 2011 Authors of draft-cheung-mpls-tp-mesh-protection Authors of draft-pan-shared-mesh-protection

  2. Solutions under Discussion • Draft-cheung-mpls-tp-mesh-protection • Taesik Cheung and Jeong-Dong Ryoo (ETRI) • Yaacov Weingarten and NuritSprecher (NSN) • Daniel King (Old Dog) • Draft-pan-shared-mesh-protection • Ping Pan, RajanRaoand Biao Lu (Infinera) • Fatai Zhang, Sam Aldrin (Huawei) • Luyuan Fang (Cisco) • Andrew G. Malis (Verizon) • Fei Zhang (ZTE) • MohanaSingamsetty (Tellabs)

  3. SMP Objectives • Sharing of protection resources • Rapid failover (optimized for packet) • Reliable message exchange • All corner cases covered • Back out on failure of protection • Notification to unprotected LSPs • Re-use of existing protection mechanisms where possible

  4. What is SMP?(Required per MPLS-TP Requirements (Req 68, 69, RFC5654)) • Key properties: • Protection LSPs’ are pre-established. • Protection switching priority is assigned for each protection path (need to be known by shared nodes). • Upon failure, a working LSP can be protected based on the priority. • It may pre-empt the other LSP’s. • Unprotected LSP’s are notified. The resources on P-Q-R are shared by multiple working LSP’s

  5. Corner Cases to be Covered • Race condition • P and Q receive requests from different LSP’s having same priority. • P and Q should decide how to resolve it. • Unnecessary service interruption • P3 and P4 should not be interrupted by P2 which will be rejected by Q.

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