Question

A service provider is deploying Segment Routing over MPLS (SR-MPLS) with IS-IS as the IGP. During verification, an engineer notices that each router advertises Adjacency SIDs for its links. On router R3, an Adjacency SID value of 24012 is assigned to the link toward R4. The engineer expects this label to be usable network-wide for steering traffic. Which statement correctly describes the nature and scope of this Adjacency SID?

Accepted Answer

The Adjacency SID is locally significant to R3 and is dynamically allocated from R3's local label pool; only R3 can interpret and pop it to forward out the specific adjacency.

Answer

The Adjacency SID is a global value allocated from the SRGB and can be imposed by any node in the domain to reach R4 via the shortest path.

Answer

The Adjacency SID is derived by adding the SRGB base to the prefix index configured on R3's loopback, making it consistent across all routers.

Answer

The Adjacency SID must be manually configured with the same value on both R3 and R4 to form a bidirectional forwarding entry.