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IETF -90 Toronto, ON Vengada Prasad Govindan Nobo Akiya

Extended BFD Discriminator TLV for MPLS ping (draft- vgovindan - mpls -extended- bfd -disc- tlv -00). IETF -90 Toronto, ON Vengada Prasad Govindan Nobo Akiya. Problem statement.

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IETF -90 Toronto, ON Vengada Prasad Govindan Nobo Akiya

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  1. Extended BFD Discriminator TLV for MPLS ping(draft-vgovindan-mpls-extended-bfd-disc-tlv-00) IETF-90 Toronto, ON Vengada Prasad Govindan Nobo Akiya

  2. Problem statement • Usage of <MPLSFEC, LSP> as the BFD session de-multiplex key at the LSR egress permits only one BFD session to be established. • Use cases involving more than one session per <MPLSFEC, LSP>: • Load balancing using entropy labels. • BFD over MPLSLSP session redundancy.

  3. Details • Generically extend the BFD Discriminator TLV to track more than one session for <MPLSFEC, LSP> • Introduce a new TLV that allows multiple BFD session(s) to be established for a given <MPLSFEC, LSP>. • LSR ingress allocated Path identifier added to the TLV. • LSR egress can allocate one unique discriminator for every LSP ping with a unique path-identifier received. • Migration of sessions established from the old to the new TLV.

  4. Open Items • Do we introduce a new procedure to allow the LSR egress to acknowledge the BFD session establishment? • LSR egress can respond to MPLS ping with CreateAckopcode in the proposed extended TLV. • Do we introduce an explicit mechanism for deleting BFD session(s) at the LSR egress? • Opcode based Delete/ DeleteAck signaled from the LSR ingress using MPLS ping. • Purge timer based: Remove the BFD sessions that tranisition from Up->Down after a timer expiry. • Continue with status quo? • Comments and feedback welcome!

  5. Next steps • Discuss open items and re-publish before seeking WG adoption.

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