Segment Routing Configuration Guide for Cisco NCS 560 Series Routers ...

Segment Routing Configuration Guide for Cisco NCS 560 Series Routers, IOS XR Release 7.0.x

First Published: 2019-08-26 Last Modified: 2020-03-17

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CONTENTS

CHAPTER 1 CHAPTER 2

CHAPTER 3 CHAPTER 4

About Segment Routing 1 Scope 1 Need 2 Benefits 2 Workflow for Deploying Segment Routing 3

Segment Routing over IPv6 Overview 5 Configuring SRv6 under IS-IS 13 Configuring SRv6 IS-IS TI-LFA 14 SRv6 Services: IPv4 L3VPN 16 SRv6 Services: IPv4 L3VPN Active-Standby Redundancy using Port-Active Mode 21 SRv6 Services for L3VPN Active-Standby Redundancy using Port-Active Mode: Operation 21 Configure SRv6 Services L3VPN Active-Standby Redundancy using Port-Active Mode 21 Configuration Example 21 Running Configuration 22 Verification 22

Configure Segment Routing Global Block and Segment Routing Local Block 27 About the Segment Routing Global Block 27 About the Segment Routing Local Block 29 Understanding Segment Routing Label Allocation 30 Setup a Non-Default Segment Routing Global Block Range 33 Setup a Non-Default Segment Routing Local Block Range 34

Configure Segment Routing for IS-IS Protocol 37 Enabling Segment Routing for IS-IS Protocol 37

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Contents

CHAPTER 5 CHAPTER 6

CHAPTER 7

Configuring a Prefix-SID on the IS-IS Enabled Loopback Interface 39 Configuring an Adjacency SID 41

Manually Configure a Layer 2 Adjacency SID 44 Configuring Bandwidth-Based Local UCMP 47 IS-IS Multi-Domain Prefix SID and Domain Stitching: Example 49

Configure IS-IS Multi-Domain Prefix SID 49 Configure Common Router ID 50 Distribute IS-IS Link-State Data 50

Configure Segment Routing for OSPF Protocol 53 Enabling Segment Routing for OSPF Protocol 53 Configuring a Prefix-SID on the OSPF-Enabled Loopback Interface 55 Configuring an Adjacency SID 57

Configure Segment Routing for BGP 61 Segment Routing for BGP 61 Configure BGP Prefix Segment Identifiers 62 Segment Routing Egress Peer Engineering 63 Configure Segment Routing Egress Peer Engineering 63 Configure BGP Link-State 64 Use Case: Configuring SR-EPE and BGP-LS 69 Configure BGP Proxy Prefix SID 70

Configure SR-TE Policies 75 SR-TE Policy Overview 75 Usage Guidelines and Limitations 76 Instantiation of an SR Policy 76 On-Demand SR Policy ? SR On-Demand Next-Hop 76 SR-ODN Configuration Steps 78 Configuring SR-ODN: Examples 80 Configuring SR-ODN for EVPN-VPWS: Use Case 86 Manually Provisioned SR Policy 107 PCE-Initiated SR Policy 107 SR-TE Policy Path Types 107

Segment Routing Configuration Guide for Cisco NCS 560 Series Routers, IOS XR Release 7.0.x iv

CHAPTER 8 CHAPTER 9

Dynamic Paths 108 Optimization Objectives 108 Constraints 109 Configure SR Policy with Dynamic Path 111

Explicit Paths 112 SR-TE Policy with Explicit Path 112 Configuring Explicit Path with Affinity Constraint Validation 117

Protocols 119 Path Computation Element Protocol 119 Configure the Head-End Router as PCEP PCC 119 BGP SR-TE 123 Configure BGP SR Policy Address Family at SR-TE Head-End 124

Traffic Steering 126 Automated Steering 126 Color-Only Automated Steering 127 Setting CO Flag 127 Address-Family Agnostic Automated Steering 128 Using Binding Segments 129 L2VPN Preferred Path 130 Static Route over Segment Routing Policy 130

Miscellaneous 134 LDP over Segment Routing Policy 134 SR-TE MPLS Label Imposition Enhancement 137 SR-TE Reoptimization Timers 138

Configure Segment Routing Path Computation Element 141 About SR-PCE 141 Configure SR-PCE 142 Configure the Disjoint Policy (Optional) 144 PCE-Initiated SR Policies 145 ACL Support for PCEP Connection 147

Configure Topology-Independent Loop-Free Alternate (TI-LFA) 149 Limitations 151

Contents

Segment Routing Configuration Guide for Cisco NCS 560 Series Routers, IOS XR Release 7.0.x v

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