Requirements of PBB-TE Segment Protection for Consideration

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Requirements of PBB-TE Segment Protection for
Consideration

• Ao Ting(ao.ting_at_zte.com.cn)
• Wei Yuehua(wei.yuehua_at_zte.com.cn)
• Wu shaoyong(wu.shaoyong_at_zte.com.cn)

March 2009
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Contents

• Background review
• Requirements of PBB-TE segment protection
• Conclusion

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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
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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

ltnew-martin-PBB-TE-segment-prot-0109-v00gt
ltnew-sultan-segment-protection-requirements-0109-v
02gtgt ltnew-Protection-Vinod-Case-for-Segment-Prote
ction-0908-v1gt
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Requirement of TESI segment protection

• e2e TESI protection infrastructure segment
  protection TESI segment protection
• TESI segment protection may apply to
• PtMP TESI protection
• Load sharing
• 11 PBB-TE segment protection
• M1 PBB-TE segment protection
• Manual switch
• For management purposes, there's motivation to do
  manual switching for specific segmented datapath
  of an e2e TESI

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PtMP TESI protection

• PtMP TESI protection
• TESI segments ??? are used to protect the PtMP
  TESI

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1
2
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Load sharing

• Load sharing in 11 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

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Load sharing (contd)

• Load sharing in M1 segment protection
• When primary segment fails, different TESI
  segments switch to different backup TESI segments
  for load sharing according to the priority

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Joint Segment
Primary TESI segment Backup TESI segment

• 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 neednt 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)

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Conclusion

• PBB-TE segment protection
• Should support TESI segment protection
• TESI segment protection
• Protect portion of TESI on PBB-TE segment
• 11 and M1 TESI segment protection
• Load sharing
• Joint segment
• Primary segment has one or more joint nodes with
  backup segment

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