When enabled, the adjacency check feature permits an adjacency between
two IS-IS interfaces only when both are configured for the same IP address type (IPv4 or
IPv6) and are configured for the same subnet.
To enable the adjacency check feature, use the following
command:
enable isis
area area_nameadjacency-check {ipv4 | ipv6}
To disable the adjacency check feature, use the following
command:
disable
isis area area_nameadjacency-check {ipv4| ipv6}