Which characteristic describes prefix segment identifier?

Prefix-SIDs do not contain interface addresses per link; that attribute is associated with Adjacency SIDs.

A Prefix Segment Identifier (Prefix-SID) is assigned to an IP prefix and is advertised by the originating router within an IGP domain. Its crucial characteristic is that it is globally unique within the Segment Routing domain, meaning the same Prefix-SID value represents the same prefix endpoint across all routers in that domain, enabling consistent forwarding behavior.

Prefix-SIDs are globally unique across the Segment Routing domain, not locally unique. Locally unique SIDs typically refer to Adjacency SIDs or Binding SIDs.

A Prefix-SID identifies an endpoint (an IP prefix) to which traffic should be routed via the IGP's shortest path, rather than containing information about a router to a specific neighbor, which is more characteristic of an Adjacency SID.