Verification

The following output indicates that the node protection mechanism actively calculates backup paths to bypass the entire router, not just the link.

Backup path in the RIB

On the P2 router, if there was a failure in the P2–P3 link or a failure of the P3 node, the backup path would circumvent the P3 node entirely.

The P7 router has a more optimal path to PE5 through P3, but it hasn’t been used due to the presence of a node protection request.

Instead, P7 is instructed to utilize the adjacency toward P4 to meet the node protection request:

RP/0/RP0/CPU0:P2#show isis fast-reroute detail 5.5.5.5/32
L2 5.5.5.5/32 [30/115] Label: 16005, medium priority
   Installed Jan 01 07:39:23.614 for 00:00:06
     via 23.0.0.3, GigabitEthernet0/0/0/0, Label: 16005, P3, SRGB Base: 16000, Weight: 0
       Backup path: TI-LFA (node), via 27.0.0.7, GigabitEthernet0/0/0/3 P7, SRGB Base: 16000...