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Requirements of PBB-TE Segment Protection for Consideration

Requirements of PBB-TE Segment Protection for Consideration. Ao Ting(ao.ting@zte.com.cn) Wei Yuehua(wei.yuehua@zte.com.cn) Wu Shaoyong(wu.shaoyong@zte.com.cn). March 2009. Contents. Background review Requirements of PBB-TE segment protection Conclusion. Background review*.

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Requirements of PBB-TE Segment Protection for Consideration

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  1. Requirements of PBB-TE Segment Protection for Consideration Ao Ting(ao.ting@zte.com.cn) Wei Yuehua(wei.yuehua@zte.com.cn) Wu Shaoyong(wu.shaoyong@zte.com.cn) March 2009

  2. Contents • Background review • Requirements of PBB-TE segment protection • Conclusion

  3. Background review* • Some definitions • TESI protection: e2e protection in P802.1Qay • TESI segment protection: protect portion of a TESI bounded by a PNP at each end • Infrastructure segment protection: link or node physical protection in the protected PBB-TE segment Primary TESI segment Backup TESI segment

  4. Background review* • FDB entry loss/destruction/configuration error • Lead to traffic loss of certain TESIs • Infrastructure segment protection can not detect such failure. • One solution : e2e TESI protection + infrastructure segment protection • blind switch to inactive segment • Unnecessary traffic loss for a manual switch *<new-martin-PBB-TE-segment-prot-0109-v00> <new-sultan-segment-protection-requirements-0109-v02>> <new-Protection-Vinod-Case-for-Segment-Protection-0908-v1>

  5. Requirement of TESI segment protection • e2e TESI protection + infrastructure segment protection + TESI segment protection • TESI segment protectionmay apply to • PtMP TESI protection • Load sharing • 1:1 PBB-TE segment protection • M:1 PBB-TE segment protection

  6. PtMP TESI protection • PtMP TESI protection • TESI segments ①②③ are used to protect the PtMP TESI 3 1 2

  7. Load sharing • Load sharing in 1:1 segment protection • TESI1 and TESI2 flow through the primary segment • Switch one of the TESI segment from primary TESI segment to backup TESI segment to share the load

  8. Load sharing (cont’d) • Load sharing in M:1 segment protection • When primary segment fails, different TESI segments switch to different backup TESI segments for load sharing according to the priority

  9. Joint Segment Primary TESI Backup TESI • Primary segment and backup segment have a joint node D (may have more than one joint nodes) in this segment protection domain. • When segment switching occurs, only nodes B and F switch the traffic. Node D needn’t be aware of the switching. • Disjoint restriction is not necessary. • If the segment domain is divided into two segment domains on the joint node, the joint node has to support more functions (e.g. MEP)

  10. Conclusion • PBB-TE segment protection • Should support TESI segment protection • TESI segment protection • Protect portion of TESI on PBB-TE segment • 1:1 and M:1 TESI segment protection • Load sharing • Joint segment • Primary segment has one or more joint nodes with backup segment

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