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Routing & Switching · Advanced

Segment Routing Traffic Engineering (SR-TE)

Traffic engineering using SR policies identified by headend, color and endpoint, steering traffic onto explicit or dynamic segment lists.

Definition

SR policies have candidate paths with preferences; each path is an explicit SID list or dynamically computed by the headend or a PCE against constraints. Traffic is steered automatically by matching BGP color communities (automated steering) or into a binding SID.

Example

segment-routing traffic-eng / policy LOW-LAT / color 100 end-point ipv4 10.255.0.5

Exam tip

SR-TE keeps state only at the headend, unlike RSVP-TE.

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