What is used by SR-TE to steer traffic through the network?

The correct answer is C. path policy. SR-TE (Segment Routing Traffic Engineering) steers traffic through the network using SR policies (path policies). An SR policy is defined by a headend router, a color (intent/service class), and an endpoint, and it contains one or more candidate paths, each expressed as a…

MPLS and Segment Routing

Question

Options

Ashortest path calculated by IGP
Bdynamic rules
Cpath policy
Dexplicit maps

How the community answered

(45 responses)

A
4% (2)
B
2% (1)
C
93% (42)

Explanation

SR-TE (Segment Routing Traffic Engineering) steers traffic through the network using SR policies (path policies). An SR policy is defined by a headend router, a color (intent/service class), and an endpoint, and it contains one or more candidate paths, each expressed as a segment list (an ordered stack of SIDs). The headend router imposes the segment list as an MPLS label stack on ingress packets matching the policy, which deterministically steers traffic along the defined path without requiring per-flow state on transit nodes. This is fundamentally different from RSVP-TE, which uses signaled tunnels. The IGP shortest path (A) is used by regular traffic, not SR-TE. 'Dynamic rules' (B) and 'explicit maps' (D) are not standard SR-TE terminology.

Topics

#Segment Routing#SR-TE#Traffic Engineering#SR Policy

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