This feature supports SR IPv6 tunnels in OSPFv3 instances 0 to 31. The user can configure a node SID for the primary IPv6 global address of a loopback interface, which then gets advertised in OSPFv3. OSPFv3 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-OSPF3 tunnel in the TTMv6 for use by the routes and services.