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Changes Since the Last Version

Proactive Connection Verification, Continuity Check and Remote Defect indication for MPLS Transport Profile draft-ietf-mpls-tp-cc-cv-rdi-02 editors: Dave Allan, John Drake, George Swallow . Changes Since the Last Version. Comment resolution Primarily clarification and editorial Major changes

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Changes Since the Last Version

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  1. Proactive Connection Verification, Continuity Check and Remote Defect indication for MPLS Transport Profiledraft-ietf-mpls-tp-cc-cv-rdi-02editors:Dave Allan, John Drake, George Swallow

  2. Changes Since the Last Version • Comment resolution • Primarily clarification and editorial • Major changes • Interleaving of CC and CV • Relocation of source MEP information • Clarifications on the startup procedures • Minor changes • IP encapsulation added for backwards compatibility • RDI clarified as being a diagnostic code • Poll/Final clarified as not valid operation for GAL/G-ACh encapsulated BFD

  3. CC CC CC CV CC Interleaving of CC and CV • Objective is to reduce sink MEP processing load while still offering mis-connectivity detection • A source MEP can send CV source MEP information every ‘n’ CC messages • Note CV counts as a CC for LOC defect detection • Discussion point is defect exit criteria • Either LSP “locks” in down state on detecting mis-connectivity OR there is a minimum insertion interval for CV

  4. Relocation of Source MEP Information • No longer uses ACh TLV • ACh channel type identifies if source MEP TLV trails the BFD control packet 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |0 0 0 1|Version| Flags | 0xHH BFD CV Code Point | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ BFD Control Packet ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | | ~ Unique MEP-ID of source of the BFD packet ~ | | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

  5. Clarification on Startup • For DOWN and INIT states, tx rate is 1/sec and detection time is 3.5 seconds • On transition to UP tx rate switches to configured/negotiated rate and detection time is “detect mult x tx interval”

  6. Next Steps • Continue to gather feedback from the list • May need to progress draft without addressing uni-directional paths • Document in a “bis” version

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