Segment Routing vs MPLS TE: Which to Master for CCIE Service Provider in 2026
Segment Routing Traffic Engineering (SR-TE) replaces RSVP-TE’s hop-by-hop signaling with a source-routed model where the headend router encodes the entire path as a SID list — eliminating per-LSP state from every transit router in your SP backbone. For CCIE SP candidates, understanding both technologies and their tradeoffs is now essential: the v6 lab tests SR-TE policies, TI-LFA, and Flex-Algo alongside legacy RSVP-TE tunnels. Key Takeaway: SR-TE is rapidly replacing RSVP-TE in production SP networks because it eliminates control-plane state from the core, scales better, and integrates natively with SDN controllers — but RSVP-TE’s built-in bandwidth reservation still matters for specific use cases, and both appear on the CCIE SP lab. ...