MPLS and RSVP-TE
148
MPLS Guide
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3.23 Configuring and Operating SR-TE
This section provides information on the configuration and operation of the Segment
Routing with Traffic Engineering (SR-TE) LSP. It covers the following topics:
• SR-TE Configuration Prerequisites
• SR-TE LSP Configuration Overview
• Configuring Path Computation and Control for SR-TE LSPs
• Configuring SR-TE LSP Label Stack Size
• Configuring Adjacency SID Parameters
• Configuring PCC-controlled, PCE-computed, and PCE-controlled SR-TE LSPs
3.23.1 SR-TE Configuration Prerequisites
To configure SR-TE, the user must first configure the prerequisite parameters.
First, configure the label space partition for the Segment Routing Global Block
(SRGB) for all participating routers in the segment routing domain by using the
mpls-labels>sr-labels command.
Example: configure>router>mpls-labels
sr-labels start 200000 end 200400
exit
Enable segment routing, traffic engineering, and advertisement of router capability in
all participating IGP instances in all participating routers by using the traffic-
engineering, advertise-router-capability, and segment-routing commands.
Example: ospf 0
traffic-engineering
advertise-router-capability area
loopfree-alternates remote-lfa
area 0.0.0.202
stub
no summaries
exit
interface "system"
node-sid index 194
no shutdown
exit
interface "toSim199"
interface-type point-to-point
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