OSPFv3 non-stop routing (NSR) can be re-enabled if it has been disabled. The following task re-enables NSR for OSPFv3.
device# configure terminal
device(config)# ipv6 router ospf
device(config-ipv6-router-ospf-vrf-default-vrf)# nonstop-routing
The following example re-enables NSR for OSPFv3.
device# configure terminal device(config)# ipv6 router ospf device(config-ipv6-router-ospf-vrf-default-vrf)# nonstop-routing