Nokia 7705 SAR-W Series - Configuration of S-BFD on SR-TE Lsps

MPLS Guide MPLS and RSVP-TE
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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 on seamless BFD, refer to 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
3.12.6.1 Configuration of S-BFD on SR-TE LSPs
For PCC-initiated or PCC-controlled LSPs, the head end of an S-BFD session is
configured under the SR-TE LSP context, the SR-TE primary path context, or the
SR-TE secondary path context by using the following commands:
• config>router>mpls>lsp lsp-name sr-te>bfd
• config>router>mpls>lsp lsp-name sr-te>primary>bfd
• config>router>mpls>lsp lsp-name sr-te>secondary>bfd
The remote discriminator value is determined by passing the to address of the LSP
to BFD, which then matches it to a mapping table of peer IP addresses to reflector
remote discriminators. If there is no match for the to address of the LSP, a BFD
session is not established on the LSP or path.
The referenced BFD template must specify parameters that are consistent with an
S-BFD session; for example, the endpoint type must be np.
S-BFD can be configured at the LSP level, as follows:
configure>router>mpls>lsp <name> sr-te
bfd
Note: A remote peer IP address-to-discriminator mapping must exist prior to bringing an
LSP administratively up.