MPLS and RSVP-TE
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MPLS Guide
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Figure 9 FRR Node-Protection Example
LSP_1 had requested node protection, but due to lack of an available path it could
only obtain link protection. Therefore, every 60 s, the PLR for LSP_1 will search for
a new path that might be able to provide node protection. When P4 is back online
and such a path is available, a new bypass tunnel will be signaled and LSP_1 will be
associated with this new bypass tunnel.
3.7.5 Admin Group Support on Facility Bypass Backup
LSPs
Admin group support on facility bypass backup LSPs provides for the inclusion of the
LSP primary path admin-group constraints in the computation of an FRR facility
bypass backup LSP to protect the primary LSP path. Admin group constraints are
honored by all nodes in the LSP path both for primary and FRR backup LSPs.
This feature is supported on primary paths of an RSVP point-to-point LSP in both
intra-area and inter-area TE where applicable.
This feature is not supported on one-to-one detour backup LSPs.
20124
P3PE_3 P4
P5
PE_4
P1 P2 PE_2PE_1
P1 protects P2
LSP_1
P1 protects the link to P2
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