You can enable IPv6 IS-IS MT in an area or a domain so that the MT-enabled devices runs IPv6 IS-IS in multi SPF mode. The following task enables IPv6 IS-IS MT with transition support.
device# configure terminal
device(config)# router isis
device(config-isis-router)# address-family ipv6 unicast
device(config-router-isis-ipv6u)# multi-topology transition
The following example enables IPv6 IS-IS MT with transition support.
device# configure terminal device(config)# router isis device(config-isis-router)# address-family ipv6 unicast device(config-router-isis-ipv6u)# multi-topology transition