When OSPFv3 is enabled in a non-default VRF instance, the device enters OSPFv3 router VRF configuration mode. Several commands can then be accessed that allow the configuration of OSPFv3.
device# configure terminal
device(config)# ipv6 router ospf vrf green
The following enables OSPFv3 in a non-default VRF.
device# configure terminal device(config)# ipv6 router ospf vrf green device(config-ipv6-router-ospf-vrf-green)#