Understanding SR-MPLS Prefix and Adjacency Segments
# What Are Prefix Segments?
* Globally unique labels assigned to network prefixes.
* Advertised via IGP (OSPF, IS-IS) with SRGB (Segment Routing Global Block).
# What Are Adjacency Segments?
* Locally significant labels assigned to direct router adjacencies.
* Not globally visible-only used within a local router's LFIB (Label Forwarding Information Base).
Why is the Answer FALSE?
# Prefix Segments are globally unique, but Adjacency Segments are only locally significant.# Adjacency Segments are not distributed globally through IGP.# Only Prefix Segments use globally advertised SRGB labels.
Real-World Application:
* Segment Routing Traffic Engineering (SR-TE): Uses prefix segments for global routing and adjacency segments for local path steering.
* 5G Core Networks: Uses SR-MPLS with Prefix SIDs for scalable path selection.
# Reference: Huawei HCIE-Datacom Guide - SR-MPLS Prefix & Adjacency Segments