IS-IS SR-TE Static Adjacency SID

Adjacency segment is a strict forwarded single-hop tunnel that carries packets over a specific link between two nodes, irrespective of the link cost. This feature introduces support for static adjacency segment identifier (SID) labels for an interface or an interface group. Configuring a static adjacency SID on an interface causes the existing dynamically allocated adjacency SID to be removed along with the transit route for the same. For static adjacency SIDs, the labels can be picked from either a static reserved label pool or from an IS-IS segment routing global block (SRGB), depending on configuration choice. Configuring the same static adjacency SID for multiple interfaces by grouping a set of interfaces under an interface group and configuring the adjacency SID for that interface group causes weighted load balancing of the traffic among the interfaces under the interface group using configured weight.