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Framework and Requirements for Shared Mesh Protection in MPLS-TP

Framework and Requirements for Shared Mesh Protection in MPLS-TP. IETF 84 July, 2012 Yaacov Weingarten Sam K. Aldrin. Contributors to SMP. Andrew Malis ( Verizon) Daniel King (Old Dog Consulting) Eric Osborne ( Cisco) Fei Zhang (ZTE ) Jeong -dong Ryoo ( ETRI)

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Framework and Requirements for Shared Mesh Protection in MPLS-TP

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  1. Framework and Requirements for Shared Mesh Protection in MPLS-TP IETF 84 July, 2012 Yaacov Weingarten Sam K. Aldrin

  2. Contributors to SMP 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 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-sikCheung (ETRI) IETF 84

  3. What is Shared Meshes Protection (SMP)? Key properties: • Setup protecting LSP’s ahead of time • All protection related information are pre-computed and loaded to the relevant nodes • Upon failure, use Linear Protection mechanism in switching-over traffic • SMP protocol may be required to coordinate the usage of shared resources W1 P1 P2 W2 The resources on P-Q-R are shared by multiple working LSP’s IETF 84

  4. 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-fmwk • draft-cheung-mpls-tp-mesh-protection-05 • draft-pan-shared-mesh-protection-04 • Lack of information to chart a path forward It’s to everybody’s interest to consolidate IETF 84

  5. The Plan @IETF83 • Framework and requirements (draft-weingarten-mpls-smp-requirements) • SMP Mechanisms and Procedures To be published soon IETF 84

  6. Update • Requirement document defines requirements in detail • Problem definition • Requirements • Functional components • Preemption behavior • Restrictions • A common solution, which is within the above framework • Solution document to be published once WG agrees to the framework and requirements IETF 84

  7. SMP Example ? Protection Segment Protection Segment • SMP mechanism coordinates the usage of all the shared resources on the protection LSPs • There could be multiple requests contending for same resources IETF 84

  8. Requirement Highlights • Resource reservation at the time of creation. Actual allocation at the time of activation • Resource coordination while activating and allocation of resources • Ability to query the resource availability • Pre-emption of resources • Priority allocation for primary paths which share protected resources • Notification mechanism • Switch time of 50msec • Hold-Off and Wait-To-Restore timer support IETF 84

  9. Summary • Shared Mesh Protection is an important function in TP-enabled transport networks • Received comments. Solicit more comments from WG • Will be publishing new version after incorporating comments IETF 84

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