It’s nice to know that changing IPv6 OSPF router-id doesn’t need to reload the router.

Rack18R6(config-subif)#ipv router ospf 1
Rack18R6(config-rtr)#do sh ipv ospf d

            OSPFv3 Router with ID (150.18.6.6) (Process ID 1)
Rack18R6(config-rtr)#router-
Rack18R6(config-rtr)#router-id 150.1.6.6
Rack18R6(config-rtr)#do sh ipv ospf d   

            OSPFv3 Router with ID (150.1.6.6) (Process ID 1)