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Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router,

Release 5.1.x

First Published: February 17, 2014

Last Modified: September 05, 2014

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Cisco Systems, Inc.

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Fax: 408 527-0883

CONTENTS

Preface

Preface xvii

Changes to This Document xvii

Obtaining Documentation and Submitting a Service Request xvii

CHAPTER 1

New and Changed Feature Information in Cisco IOS XR Release 5.1.x 1

CHAPTER 2

Implementing MPLS Label Distribution Protocol 5

Prerequisites for Implementing Cisco MPLS LDP 6

Information About Implementing Cisco MPLS LDP 7

Overview of Label Distribution Protocol 7

Label Switched Paths 7

LDP Control Plane 7

Exchanging Label Bindings 8

LDP Forwarding 9

LDP Graceful Restart 11

Control Plane Failure 11

Phases in Graceful Restart 12

Recovery with Graceful-Restart 14

Label Advertisement Control (Outbound Filtering) 15

Label Acceptance Control (Inbound Filtering) 15

Local Label Allocation Control 16

Session Protection 16

IGP Synchronization 17

IGP Auto-configuration 18

IGP Synchronization Process Restart Delay 18

LDP Nonstop Routing 19

Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x

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IP LDP Fast Reroute Loop Free Alternate 19

Downstream on Demand 21

MPLS LDP Carrier Supporting Carrier for Multiple VRFs 21

MPLS Carrier Supporting Carrier L3VPN: Introduction 21

Benefits of MPLS LDP CSC 22

Multiple VRF Support 23

RSI 23

VRF Table ID Database 23

VRF-Interface Mapping 23

Context Isolation 24

Default Context 24

Restrictions and Recommendations 24

How to Implement MPLS LDP 25

Configuring LDP Discovery Parameters 25

Configuring LDP Discovery Over a Link 27

Configuring LDP Discovery for Active Targeted Hellos 29

Configuring LDP Discovery for Passive Targeted Hellos 32

Configuring Label Advertisement Control (Outbound Filtering) 34

Setting Up LDP Neighbors 36

Setting Up LDP Forwarding 39

Configuring Global Transport Address 42

Setting Up LDP NSF Using Graceful Restart 43

Configuring Label Acceptance Control (Inbound Filtering) 46

Configuring Local Label Allocation Control 48

Configuring Session Protection 49

Configuring LDP IGP Synchronization: OSPF 50

Disabling LDP IGP Synchronization: OSPF 53

Configuring LDP IGP Synchronization: ISIS 55

Configuring LDP IGP Synchronization Delay Interval 56

Configuring LDP IGP Synchronization Process Restart Delay 58

Enabling LDP Auto-Configuration for a Specified OSPF Instance 59

Enabling LDP Auto-Configuration in an Area for a Specified OSPF Instance 61

Disabling LDP Auto-Configuration 62

Configuring LDP Nonstop Routing 63

Configuring LDP Downstream on Demand mode 66

Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x

Contents

Redistributing MPLS LDP Routes into BGP 67

Enabling MLDP 69

Enabling MLDP Make-Before-Break 70

Enabling MLDP MoFRR 71

Enabling MLDP Recursive FEC 73

Enabling MLDP Static Multipoint to Multipoint LSP 74

Enabling MLDP Static Point to Multipoint LSP 76

Disabling MLDP 78

Configuration Examples for Implementing MPLS LDP 79

Configuring LDP with Graceful Restart: Example 79

Configuring LDP Discovery: Example 79

Configuring LDP Link: Example 80

Configuring LDP Discovery for Targeted Hellos: Example 80

Configuring Label Advertisement (Outbound Filtering): Example 80

Configuring LDP Neighbors: Example 81

Configuring LDP Forwarding: Example 81

Configuring LDP Nonstop Forwarding with Graceful Restart: Example 82

Configuring Label Acceptance (Inbound Filtering): Example 82

Configuring Local Label Allocation Control: Example 82

Configuring LDP Session Protection: Example 83

Configuring LDP IGP Synchronization—OSPF: Example 83

Configuring LDP IGP Synchronization—ISIS: Example 83

Configuring LDP Auto-Configuration: Example 84

Configure IP LDP Fast Reroute Loop Free Alternate: Examples 84

Verify IP LDP Fast Reroute Loop Free Alternate: Example 86

MPLS LDP CSC for Multiple VRFs Configuration: Examples 88

Additional References 99

CHAPTER 3

Implementing MPLS Static Labeling 101

Enable MPLS Encapsulation on an Interface 102

Define a Range for Static MPLS Labels 103

Setup a Static LSP 104

Allocate Static MPLS Label to an IP Prefix and Configure a LSP 105

Allocate Static MPLS Label for a Specific VRF 107

Verify MPLS Static Bindings 108

Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x

Contents

Identify and Clear Label Discrepancy 109

CHAPTER 4

Implementing RSVP for MPLS-TE and MPLS O-UNI 111

Prerequisites for Implementing RSVP for MPLS-TE and MPLS O-UNI 112

Information About Implementing RSVP for MPLS-TE and MPLS O-UNI 112

Overview of RSVP for MPLS-TE and MPLS O-UNI 112

LSP Setup 113

High Availability 114

Graceful Restart 114

Graceful Restart: Standard and Interface-Based 115

Graceful Restart: Figure 116

ACL-based Prefix Filtering 117

RSVP MIB 117

Information About Implementing RSVP Authentication 118

RSVP Authentication Functions 118

RSVP Authentication Design 118

Global, Interface, and Neighbor Authentication Modes 119

Security Association 120

Key-source Key-chain 121

Guidelines for Window-Size and Out-of-Sequence Messages 122

Caveats for Out-of-Sequence 122

How to Implement RSVP 122

Configuring Traffic Engineering Tunnel Bandwidth 123

Confirming DiffServ-TE Bandwidth 123

Configuring MPLS O-UNI Bandwidth 124

Enabling Graceful Restart 125

Configuring ACL-based Prefix Filtering 126

Configuring ACLs for Prefix Filtering 126

Configuring RSVP Packet Dropping 127

Verifying RSVP Configuration 129

Enabling RSVP Traps 132

How to Implement RSVP Authentication 133

Configuring Global Configuration Mode RSVP Authentication 133

Enabling RSVP Authentication Using the Keychain in Global Configuration Mode 133

Configuring a Lifetime for RSVP Authentication in Global Configuration Mode 135

Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x

Contents

Configuring the Window Size for RSVP Authentication in Global Configuration Mode 136

Configuring an Interface for RSVP Authentication 137

Specifying the RSVP Authentication Keychain in Interface Mode 137

Configuring a Lifetime for an Interface for RSVP Authentication 139

Configuring the Window Size for an Interface for RSVP Authentication 140

Configuring RSVP Neighbor Authentication 141

Specifying the Keychain for RSVP Neighbor Authentication 142

Configuring a Lifetime for RSVP Neighbor Authentication 143

Configuring the Window Size for RSVP Neighbor Authentication 144

Verifying the Details of the RSVP Authentication 146

Eliminating Security Associations for RSVP Authentication 146

Configuration Examples for RSVP 146

Bandwidth Configuration (Prestandard): Example 146

Bandwidth Configuration (MAM): Example 146

Bandwidth Configuration (RDM): Example 147

Refresh Reduction and Reliable Messaging Configuration: Examples 147

Refresh Interval and the Number of Refresh Messages Configuration: Example 147

Retransmit Time Used in Reliable Messaging Configuration: Example 147

Acknowledgement Times Configuration: Example 147

Summary Refresh Message Size Configuration: Example 148

Disable Refresh Reduction: Example 148

Configure Graceful Restart: Examples 148

Enable Graceful Restart: Example 148

Enable Interface-Based Graceful Restart: Example 148

Change the Restart-Time: Example 149

Change the Hello Interval: Example 149

Configure ACL-based Prefix Filtering: Example 149

Set DSCP for RSVP Packets: Example 149

Enable RSVP Traps: Example 150

Configuration Examples for RSVP Authentication 150

RSVP Authentication Global Configuration Mode: Example 150

RSVP Authentication for an Interface: Example 151

RSVP Neighbor Authentication: Example 151

RSVP Authentication by Using All the Modes: Example 152

Additional References 152

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Contents

CHAPTER 5

Implementing MPLS Forwarding 155

Prerequisites for Implementing Cisco MPLS Forwarding 156

Restrictions for Implementing Cisco MPLS Forwarding 156

Information About Implementing MPLS Forwarding 156

MPLS Forwarding Overview 156

Label Switching Functions 157

Distribution of Label Bindings 157

MFI Control-Plane Services 158

MFI Data-Plane Services 158

Time-to-Live Propagation in Hierarchical MPLS 158

MPLS Maximum Transmission Unit 158

How to Implement MPLS Forwarding 158

Configuring the Time-to-Live Propagation in Hierarchical MPLS 159

Configuring the Size of the Local Label 160

Additional References 161

CHAPTER 6

Implementing MPLS Traffic Engineering 163

Prerequisites for Implementing Cisco MPLS Traffic Engineering 165

Information About Implementing MPLS Traffic Engineering 166

Overview of MPLS Traffic Engineering 166

Benefits of MPLS Traffic Engineering 166

How MPLS-TE Works 166

MPLS Traffic Engineering 168

Backup AutoTunnels 168

AutoTunnel Attribute-set 168

Link Protection 169

Node Protection 169

Backup AutoTunnel Assignment 170

Explicit Paths 171

Periodic Backup Promotion 171

Protocol-Based CLI 171

Differentiated Services Traffic Engineering 172

Prestandard DS-TE Mode 172

IETF DS-TE Mode 172

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Contents

Bandwidth Constraint Models 173

Maximum Allocation Bandwidth Constraint Model 173

Russian Doll Bandwidth Constraint Model 173

TE Class Mapping 174

Flooding 174

Flooding Triggers 174

Flooding Thresholds 175

Fast Reroute 175

IS-IS IP Fast Reroute Loop-free Alternative 176

MPLS-TE and Fast Reroute over Link Bundles 176

Ignore Intermediate System-to-Intermediate System Overload Bit Setting in MPLS-TE 177

DWDM Transponder Integration 178

GMPLS Benefits 178

GMPLS Support 178

GMPLS Protection and Restoration 179

1:1 LSP Protection 179

Shared Mesh Restoration and M:N Path Protection 179

End-to-end Recovery 180

GMPLS Protection Requirements 180

GMPLS Prerequisites 180

Flexible Name-based Tunnel Constraints 180

MPLS Traffic Engineering Interarea Tunneling 181

Interarea Support 181

Multiarea Support 181

Loose Hop Expansion 182

Loose Hop Reoptimization 183

ABR Node Protection 183

Fast Reroute Node Protection 183

MPLS-TE Forwarding Adjacency 183

MPLS-TE Forwarding Adjacency Benefits 183

MPLS-TE Forwarding Adjacency Restrictions 184

MPLS-TE Forwarding Adjacency Prerequisites 184

Unequal Load Balancing 184

Path Computation Element 185

Policy-Based Tunnel Selection 186

Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x

Contents

Policy-Based Tunnel Selection 186

Policy-Based Tunnel Selection Functions 187

PBTS Restrictions 187

Path Protection 188

Pre-requisites for Path Protection 188

Restrictions for Path Protection 189

Restrictions for Explicit Path Protection 189

Co-existence of Path Protection with Fast Reroute 190

MPLS-TE Automatic Bandwidth 190

MPLS-TE Automatic Bandwidth Overview 190

Adjustment Threshold 192

Overflow Detection 192

Underflow Detection 192

Restrictions for MPLS-TE Automatic Bandwidth 193

Point-to-Multipoint Traffic-Engineering 193

Point-to-Multipoint Traffic-Engineering Overview 193

Point-to-Multipoint RSVP-TE 195

Point-to-Multipoint Fast Reroute 196

Point-to-Multipoint Label Switch Path 196

Path Option for Point-to-Multipoint RSVP-TE 196

MPLS Traffic Engineering Shared Risk Link Groups 198

Explicit Path 199

Fast ReRoute with SRLG Constraints 199

Importance of Protection 201

Delivery of Packets During a Failure 202

Multiple Backup Tunnels Protecting the Same Interface 202

SRLG Limitations 202

MPLS TE SRLG Scale Enhancements 203

Soft-Preemption 203

Path Option Attributes 204

Configuration Hierarchy of Path Option Attributes 204

Traffic Engineering Bandwidth and Bandwidth Pools 205

Path Option Switchover 205

Path Option and Path Protection 206

Auto-Tunnel Mesh 206

Cisco IOS XR MPLS Configuration Guide for the Cisco CRS Router, Release 5.1.x

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