66th IETF Montreal July 2006

Analysis of Inter-domain Label Switched Path (LSP) Recovery

draft-takeda-ccamp-inter-domain-recovery-analysis-00.txt

Tomonori Takeda (NTT)

Yuichi Ikejiri (NTT Communications)

Adrian Farrel (Old Dog Consulting)

Jean-Philippe Vasseur (Cisco)

66th IETF Montreal July 2006

Summary

• Submitted to CCAMP WG, presented here for information (PCE is one solution candidate)

• The whole scope– Framework and analysis of inter-domain MPLS/GMPLS TE LSP

recovery techniques– Based on existing inter-domain framework

• Specifically for this version– End-to-end diversity– Path computation and signaling aspects– List of various schemes

• Use cases– Inter-area/AS/Provider– GMPLS UNI/L1VPNs– MPLS over GMPLS

66th IETF Montreal July 2006

Key Technical Elements

• With or without confidentiality• Per-domain path computation or inter-

domain collaborative path computation• Sequential path computation or

simultaneous path computation

• By combining of above (and plus some) elements, list 12 schemes (in broad category)

66th IETF Montreal July 2006

Example1• Without confidentiality• Per-domain path computation• Sequential path computation XRO

Recovery LSP

Working LSPObtain RRO via Resv msgObtain RRO via Resv msg

Copy RRO into XRO in Path msg

Copy RRO into XRO in Path msg

66th IETF Montreal July 2006

Example2

• With confidentiality• Inter-domain collaborative path computation• Simultaneous path computation Cookie or Encryption

Recovery LSP

Working LSP

PCE PCE PCE Result of path computation (temporary cash)

Result of path computation (temporary cash)

Result of path computation (temporary cash)

Result of path computation (temporary cash)

Partial pathPartial path

Query PCE for ERO expansionQuery PCE for ERO expansion

Return cashReturn cash

Partial pathPartial pathPartial pathPartial path

66th IETF Montreal July 2006

Relevance to PCE WG

• Review the document

• Make sure use of PCE is correctly understood

• Authors are planning to respin the document, then ask for CCAMP WG document