Segment Routing

These documents cover Segment Routing – both its core concepts and configuration.

Automated Steering

A quick reference overview of how Automated Steering works based on an example topology.

Binding SIDs & the SRLB

Binding SIDs are a powerful tool within SR, that allows you to uniquely identify an SR Policy. It provides SID list simplification, opacity and protection from churn for outside domains. This document gives an overview of the basics.

Flexible Algorithm

Using Flex-Algos with Segment Routing you can create customised algorithms by defining optimisation metrics and constraints. Each Flex-Algo creates its own topology of the network right down its TI-LFA backup paths. This doc gives an introduction to Flex-Algo along with some basic IOS-XR configuration.

IGP Extensions

How TLVs are formatted and communicated as  IGPs extension can be confusing to keep track of. This document aims to provide a quick reference for how such extensions are applied to IS-IS and OSPF with regards to Segment Routing.

On Demand Next Hop

Segment Routing ODN allows for dynamic instantiation of polices based on existing templates. This document describes how this is done with XR CLI configuration and output examples.

Segment Types

This cheat sheet shows the major Segment Types involved in Segment Routing, describing the underlying idea of each, along with a diagram showing an example of how the forwarding is done.