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Detecting P2MP Data Plane Failures draft-yasukawa-mpls-p2mp-lsp-ping-02.txt

Detecting P2MP Data Plane Failures draft-yasukawa-mpls-p2mp-lsp-ping-02.txt. Seisho Yasukawa - yasukawa.seisho@lab.ntt.co.jp Adrian Farrel - adrian@olddog.co.uk Zafar Ali – zali@cisco.com Bill Fenner - fenner@research.att.com. Recap of Objectives. Point-to-multipoint MPLS development is real

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Detecting P2MP Data Plane Failures draft-yasukawa-mpls-p2mp-lsp-ping-02.txt

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  1. Detecting P2MP Data Plane Failuresdraft-yasukawa-mpls-p2mp-lsp-ping-02.txt Seisho Yasukawa - yasukawa.seisho@lab.ntt.co.jp Adrian Farrel - adrian@olddog.co.uk Zafar Ali – zali@cisco.com Bill Fenner - fenner@research.att.com 63rd IETF Parris August 2005

  2. Recap of Objectives • Point-to-multipoint MPLS development is real • P2MP MPLS-TE is under development in the MPLS working group • Work starting on multicast LDP • Need simple and efficient mechanisms to detect data plane failures in P2MP MPLS LSPs Requirements include: • Verification of reception at recipients. • Discovering point-to-multipoint tree topology. • Ping/Trace from ingress/egress. • Whole tree (source-to-recipient) • Individual recipients • Objective is to build a solution on top of existing LSP Ping technology 63rd IETF Parris August 2005

  3. Proposed Solution • Heavy re-use of LSP Ping • Need to identify the LSP • Introduce RSVP P2MP Session sub-TLV • Ingress can control ping/trace of whole tree or individual recipients • Necessary to protect the ingress from being swamped • Introduce P2MP Egress Identifier sub-TLV (of FEC Stack TLV) • Place-holder for multicast LDP FEC when stable • P2MP LSP Ping • Echo request cannot be filtered based on identified recipient • Echo response only from targeted recipient • P2MP LSP traceroute • Echo request cannot be filtered based on identified recipient • Only LSRs on the path to identified recipients respond 63rd IETF Parris August 2005

  4. Changes in 02 Revision • New co-author (Bill Fenner) • Introduce jitter parameter • Allows initiator to specify jitter at responder • Increases size of tree that can be pinged • Parameter might be added to response to indicate how much jitter was applied (not in current version) • Editorial nits and boilerplate 63rd IETF Parris August 2005

  5. Further Issues & Questions • Support multicast LDP in the same I-D? • Yes! • Will need work to support multicast FEC • Consult with mLDP authors • Ping a subset of leaves? • Removed from early versions • Too much processing at transit nodes • Question raised in Minneapolis, but no follow-up on list • Minneapolis • Agreed not to merge with P2P LSP Ping I-D • Agreed this MPLS WG work • Agreed need for P2MP OAM requirements I-D • Now available • Now ready to be WG doc? 63rd IETF Parris August 2005

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