You can configure the metric value globally on all active IS-IS interfaces for the IS-IS IPv6 address family. The following task sets the IS-IS default link metric value for Level 1 for the IPv6 address family.
device# configure terminal
device(config)# router isis
device(config-isis-router)# address-family ipv6 unicast
device(config-router-isis-ipv6u)# default-link-metric level-1 45
The following example sets the IS-IS default link metric value for Level 1 for the IPv6 address family.
device# configure terminal device(config)# router isis device(config-isis-router)# address-family ipv6 unicast device(config-router-isis-ipv6u)# default-link-metric level-1 45