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Advertising S-BFD Discriminators in IS-IS draft-ginsberg-isis-sbfd-discriminator-00.txt

Advertising S-BFD Discriminators in IS-IS draft-ginsberg-isis-sbfd-discriminator-00.txt. Les Ginsberg ( ginsberg@cisco.com ) Nobo Akiya ( nobo@cisco.com ) Mach(Guoyi) Chen ( mach.chen@huawei.com ). What is S-BFD?. “Seamless” BFD Each network node pre-allocates one or more discriminators

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Advertising S-BFD Discriminators in IS-IS draft-ginsberg-isis-sbfd-discriminator-00.txt

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  1. Advertising S-BFD Discriminators in IS-IS draft-ginsberg-isis-sbfd-discriminator-00.txt Les Ginsberg (ginsberg@cisco.com) Nobo Akiya (nobo@cisco.com) Mach(Guoyi) Chen (mach.chen@huawei.com) 90th IETF, Toronto, July 2014

  2. What is S-BFD? “Seamless” BFD Each network node pre-allocates one or more discriminators “Reflector” session created to listen for pre-allocated discriminators Discriminators need to be known network wide Other nodes can perform continuity test by sending S-BFD Packet with S-BFD Discriminator in the “yourDiscriminator” field http://www.ietf.org/id/draft-ietf-bfd-seamless-base-01.txt 90th IETF, Toronto, July 2014

  3. Advertisement Format Use new sub-TLV in Router Capability TLV +-----------------------------+ | Type (to be assigned by | 1 | IANA - suggested value 19?) | +-----------------------------+ | Length (multiple of 4) | 1 +-----------------------------+ | Discriminator Value(s) | 4/Discriminator : : +-----------------------------+ Multiple Discrimintaors can be advertised Can be flooded area/domain wide using S-bit associated w the Router Capability TLV (RFC 4971) 90th IETF, Toronto, July 2014

  4. Relevant Questions Why must S-BFD Discriminators be globally unique? Well known reserved value + unique destination IP address does not suffice for all cases e.g. MPLS transport uses non-routable IP destination address How to know mapping of S-BFD Discriminators to applications? This is quite deliberately outside the scope of IGP advertisement. 90th IETF, Toronto, July 2014

  5. Request to become WG Document 90th IETF, Toronto, July 2014

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