MPLS and RSVP-TE
96
MPLS Guide
© 2022 Nokia.
Use subject to Terms available at: www.nokia.com
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3.12.2.1.1 Guidelines for Using PCC-initiated and PCC-controlled LSPs
The 7705 SAR does not support CSPF path computation for an SR-TE LSP and
uses hop-to-label translation to compute the path. The ingress LER does not monitor
network events that affect the reachability of the adjacency SID or node SID used in
the label stack of the LSP; therefore, the label stack is not updated to reflect changes
in the path except when seamless BFD is used to detect path failures. As a result, it
is recommended that this type of SR-TE LSP be used in the following configurations
only:
• empty path
• path with a single node SID loose hop
• path of an LSP to a directly connected router (single-hop LSP) with an adjacency
SID or a node SID loose or strict hop
• strict path with hops of adjacencies explicitly configured in the path and
seamless BFD used to monitor the LSP
In addition, the user can configure an SR-TE LSP with a single loose hop, using the
anycast SID concept to provide LSR node protection within a particular plane of the
network TE topology. This is illustrated in Figure 12. The user configures all LSRs in
a plane with the same loopback interface address, which must be different from that
of the system interface and the router ID of the router, and assigns them the same
node SID index value. All routers must use the same SRGB.
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