Transcript new-irene-Segment-Protection-Requirements-0309-v01.ppt

Requirements of PBB-TE
Segment Protection for
Consideration
Ao Ting([email protected])
Wei Yuehua([email protected])
Wu
Shaoyong([email protected])
March 2009
Contents
• Background review
• Requirements of PBB-TE segment protection
• Conclusion
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
A
B
C
Primary Infrastructure
Segment
D
E
Backup Infrastructure
Segment
Primary TESI segment
F
PBB-TE segment
protection domain
Backup TESI segment
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
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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
• 1:1 PBB-TE segment protection
• M:1 PBB-TE segment protection
PtMP TESI protection
• PtMP TESI protection
– TESI segments ①②③ are used to protect the
PtMP TESI
3
1
2
Primary TESI segment
Backup TESI segment
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
TESI1
TESI2
Primary TESI segment
Backup TESI segment
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
TESI1
TESI1 backup segment I
Priority 1
TESI2
TESI2 backup segment
Priority 2
TESI1 backup segment
Priority 2
TESI1 backup segment
Priority 1
Primary TESI segmemt
Backup TESI segment
Joint Segment
C
Backup segment
Primary segment
A
B
D
F
G
Backup segment
PBB-TE segment
protection domain
E
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)
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