Symptom
For p2p adjacencies, they may flap after RSP FO. If there's any lan adjacency, ISIS may not reach NSR ready.
Prior to switchover, the BFD state will be stuck at 'Init' of the standby:
RP/0/RP0/CPU0:WebOTT-LSR2#sh isis standby adjacency
Sat Nov 16 07:31:44.996 UTC
IS-IS 1 Level-2 adjacencies:
System Id Interface SNPA State Hold Changed NSF IPv4 IPv6
BFD BFD
WebOTT-LSR1 BE10 *PtoP* Up 20 00:04:06 Yes Init None
WebOTT-LSR1 BE121 *PtoP* Up 29 00:04:24 Yes Init None
Conditions
BFD enabled and neighbor must be RFC6213 compliant
Further Problem Description
Race condition involved, may not happen every time.
