This feature supports SR IPv6 tunnels in IS-IS MT=0. The user can configure a node SID for the primary IPv6 global address of a loopback interface, which is then advertised in IS-IS. IS-IS automatically assigns and advertises an adjacency SID for each adjacency with an IPv6 neighbor. After the node SID is resolved, it is used to install an IPv6 SR-ISIS tunnel in the TTM for use by the services.