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MPLS Guide
3.7.6 FRR Over Unnumbered Interfaces
When the PLR is the ingress LER node and the outgoing interface of the bypass LSP
is unnumbered, the user must assign a borrowed IP address to the interface that is
different from the system interface; otherwise, the bypass LSP will not come up.
In addition, the PLR node includes the IF_ID RSVP_HOP object (C-Type = 3) in the
PATH message if the outgoing interface of the bypass LSP is unnumbered. If the
outgoing interface of the bypass LSP is numbered, the PLR node includes the IPv4
RSVP_HOP object (C-Type = 1).
When the MP node receives the PATH message over the bypass LSP, it creates the
merge-point context for the protected LSP and associates it with the existing state if
any of the following is satisfied:
This behavior at the PLR and MP nodes is the same for both link protection and node
protection FRR.
Note: If node protection FRR is enabled but the MP does not support an unnumbered
interface, the PATH message is rejected at the MP and the path is torn down.
See
interfaces.
3HE 18686 AAAB TQZZA
• the C-Type value of the RSVP_HOP object has changed
• the C-Type is the value for the IF_ID RSVP_HOP object (C-Type = 3) and it has
not changed, but the IF_ID TLV is different
• the IPv4 Next/Previous Hop Address field in the RSVP_HOP object has
changed, regardless of the C-Type value
RSVP-TE Support for Unnumbered Interfaces
Use subject to Terms available at: www.nokia.com
© 2022 Nokia.
MPLS and RSVP-TE
for information on unnumbered
79
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