PTX10k running 24.2R1.18-EVO with 2 Routing Engines and LC1201 line cards has GRES/NSR is enabled with Protocols BGP (family inet/inet6), OSPF, OSPF3 configured.
Before switching over the RE, it is observed that the OSPFv3 neighbors are not active on the backup RE. When the RE switchover occurs, the OSPFv3 sessions to the neighbors are lost and IPv6 traffic stops flowing.
{master}
root@BORDER-2-re0> show task replication
Stateful Replication: Enabled
RE mode: Master
Protocol Synchronization Status
OSPF Complete
OSPF3 Complete
BGP Complete
root@BORDER-2-re0> show ospf3 neighbor
Warning: License key missing; requires 'OSPF' license
ID Interface State Pri Dead
10.23.15.3 et-1/0/0.0 Full 128 37
Neighbor-address fe80::22ed:47ff:fe91:ad20
10.23.15.4 et-3/0/30.0 Full 128 31
Neighbor-address fe80::6a22:8eff:fe11:bffc
No neighbor seen on Backup RE1:
{backup}
jnpr@BORDER-2-re1> show ospf3 neighbor
When the IPSEC SA was deactivated, the OSPFv3 neighbors appeared on the backup RE1.
NSR for OSPFv3 with authentication/encryption is NOT supported. Work with your Juniper Account Team to know the status of this feature.