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Phase 3.5 — Segment Routing (SR-MPLS & SRv6)

🟢 Phase 3.5 Live — Validated on Arista cEOS 4.32.0F.

Segment Routing (SR) is how hyperscalers (Google B4/Jupiter, Meta Express Backbone, AWS) and Tier-1 service providers steer traffic across global WAN backbones at massive scale. By shifting path state into the packet header (via label stacks), SR eliminates RSVP-TE/LDP soft-state overhead in core routers.

You will build SR-MPLS Node/Prefix SIDs, configure sub-50 ms Fast Reroute protection with Topology-Independent LFA (Ti-LFA), and implement centralized SR-PCE Traffic Engineering with BGP Color Steering.

Course Matrix & Labs

Lab Description Core Protocols & Concepts Status
01 SR-MPLS Node & Prefix SIDs IS-IS / OSPF SR Extensions, SRGB (16000–23999), Node SIDs, Adjacency SIDs 🟢 Validated
02 Ti-LFA Sub-50ms Fast Reroute Topology-Independent LFA, P-Space & Q-Space Math, Post-Convergence Path Protection 🟢 Validated
03 SR-PCE & BGP Color Steering Centralized Path Computation Element (PCEP RFC 5440), BGP Color Extended Communities, SR-TE Policies 🟢 Validated

Google Network Infrastructure Target Competencies

graph TD
    A["SR-MPLS Node & Prefix SIDs<br/>(IS-IS / OSPF SR Extensions & SRGB)"] --> B["Ti-LFA Sub-50ms FRR<br/>(P-Space & Q-Space Repair Stacks)"]
    B --> C["Centralized SR-PCE TE<br/>(BGP Color Steering & SR-TE Policies)"]
    classDef s fill:#1565c0,stroke:#90caf9,color:#ffffff,stroke-width:2px,font-size:14px;
    class A,B,C s;

Prerequisites

Next Steps & Interview Practice

  • Self-Test Interview Questions — Hyperscale WAN & Segment Routing interview question bank covering SR-MPLS, Node/Adjacency SIDs, Ti-LFA, and SR-PCE.