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Routing & Switching · Advanced

SR-MPLS

Segment routing using the MPLS data plane, where each segment is an MPLS label.

Definition

SR-MPLS reuses existing MPLS hardware and services (L3VPN, EVPN) while replacing LDP with IGP-distributed SIDs. It can interwork with LDP through a mapping server.

Example

show mpls forwarding on IOS XR displays SR labels 16001-16010.

Exam tip

SR-MPLS and LDP can coexist; sr-prefer selects SR labels.

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