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SR-MPLS Traffic Engineering Lab

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Solution Overview

Segment Routing Traffic Engineering or SR-MPLS Traffic Engineering adds an entirely new dimension to Segment Routing. Traffic Engineering has been around for many years as RSVP-TE; however, being very cumbersome and complex, it has gained very little popularity with few deployments. The advent of SR-MPLS TE has opened the door to vast possibilities with Traffic Engineering by dramatically simplifying the implementation, removing the state from the network, and placing it in the packet.

This lab provides a hands-on environment with Cisco XRv9000 routers to demonstrate some of the primary use cases of SR-MPLS Traffic Engineering. We will explore basic SR-MPLS Traffic Engineering with both explicit paths and dynamic paths using ODN-AS or On-demand Next-hop with Automated Steering. BGP Color communities are used to tag prefixes for Traffic Engineering. In addition, an SR PCE or Path Computation Element is utilized to do centralized Traffic Engineering. The SR PCE functionality runs natively on IOS XR and does not require any additional hardware; however, we will use a dedicated BGP Route Reflector to perform the SR PCE functionality.

Goals & Objectives

The purpose of this lab is to expose the user to SR-MPLS Traffic Engineering. The user will explore several use cases, including explicit paths, dynamic paths and disjoint paths.

You will learn how to configure SR-MPLS Traffic Engineering on Cisco IOS XRv9000 routers running ISIS. You will assign BGP Color communities to steer traffic along an SR-MPLS Traffic Engineering user-defined path. You will configure an SR PCE to allow traffic to traverse multiple disjoint paths from source to destination dynamically.

The configuration exercises include:

  • Defining BGP Color communities
  • SR Policy configuration with Explicit Path
  • SR Policy configuration with Dynamic Path
  • SR Policy configuration with SR PCE and Dynamic Disjoint Path for Single headend
  • SR Policy configuration with SR PCE and Dynamic Disjoint Path for Multiple headends
  • SR Policy configuration with Explicit Path and Adjacency SID

Hardware & Software

14 Cisco IOS XRv9000 routers running 7.3.1