The 7705 SAR supports seamless BFD (S-BFD). Unlike LSP BFD, S-BFD does not rely on the traditional BFD session bootstrapping process or session state at the tail end of a session. Instead, when S-BFD is initialized the system selects a set of discriminators for the reflector or initiator function.
One S-BFD reflector is configured per system in the config>bfd>seamless-bfd context. A mapping between reflector discriminators and their IP addresses is configured on the initiator in the config>router>bfd>seamless-bfd context.
For information about seamless BFD, see the 7705 SAR Router Configuration Guide, Seamless BFD.
This section describes the application of S-BFD to SR-TE LSPs and the LSP configuration required for this feature.
S-BFD is supported in the following SR-TE contexts:
PCC-initiated:
SR-TE LSP level
SR-TE primary path
SR-TE secondary and standby paths