RP/0/RP0/CPU0:R1(config)#router isis 1
RP/0/RP0/CPU0:R1(config-isis)# interface GigabitEthernet0/0/0/0
RP/0/RP0/CPU0:R1(config-isis-if)#  address-family ipv4 unicast
RP/0/RP0/CPU0:R1(config-isis-if-af)#   metric ?
  <1-16777214>  Default metric: <1-63> for narrow, <1-16777214> for wide
  fallback      Increase the link metric when an event occurs
  maximum       Maximum wide metric. All routers will exclude this link from their SPF
RP/0/RP0/CPU0:R1(config-isis-if-af)#   metric 
% Incomplete command.
RP/0/RP0/CPU0:R1(config-isis-if-af)#commit
Wed Sep  9 09:48:14.636 UTC
RP/0/RP0/CPU0:R1(config-isis-if-af)#end