Cisco CRS User manual

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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©2014 Cisco Systems, Inc. All rights reserved.

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
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
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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
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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
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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
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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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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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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
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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
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Destination List (Prefix-List) 207
VRF Redirection to MPLS TE Tunnels 207
MPLS TE Extended Admin Groups 208
Stateful Path Computation Element 208
Stateful PCE State Reporting 209
Stateful PCE State Synchronization 210
Stateful PCE Delegation 210
Stateful PCE State Updating 210
Stateful PCE Creation of LSPs 210
MPLS TE Usability Enhancements 210
MPLS TE IPv6 Autoroute 211
MPLS TE IPv6 Autoroute Restrictions 211
MPLS TE Path Cost Limit 211
Soft-preemption over FRR Backup Tunnels 212
MPLS TE Auto-tunnel Mesh One-hop 213
Inter-area Traffic Engineering with Dynamic ABR Discovery 213
How to Implement Traffic Engineering 213
Building MPLS-TE Topology 213
Creating an MPLS-TE Tunnel 216
Configuring Forwarding over the MPLS-TE Tunnel 218
Protecting MPLS Tunnels with Fast Reroute 220
Enabling an AutoTunnel Backup 225
Removing an AutoTunnel Backup 226
Establishing MPLS Backup AutoTunnels to Protect Fast Reroutable TE LSPs 227
Establishing Next-Hop Tunnels with Link Protection 229
Configuring a Prestandard DS-TE Tunnel 231
Configuring an IETF DS-TE Tunnel Using RDM 233
Configuring an IETF DS-TE Tunnel Using MAM 235
Configuring MPLS -TE and Fast-Reroute on OSPF 238
Configuring the Ignore Integrated IS-IS Overload Bit Setting in MPLS-TE 240
Configuring GMPLS 241
Configuring IPCC Control Channel Information 242
Configuring Router IDs 242
Configuring OSPF over IPCC 244
Configuring Local and Remote TE Links 246
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Configuring Numbered and Unnumbered Links 246
Configuring Local Reservable Bandwidth 248
Configuring Local Switching Capability Descriptors 249
Configuring Persistent Interface Index 250
Enabling LMP Message Exchange 251
Disabling LMP Message Exchange 253
Configuring Remote TE Link Adjacency Information for Numbered Links 254
Configuring Remote TE Link Adjacency Information for Unnumbered Links 257
Configuring Numbered and Unnumbered Optical TE Tunnels 258
Configuring an Optical TE Tunnel Using Dynamic Path Option 259
Configuring an Optical TE Tunnel Using Explicit Path Option 261
Configuring LSP Hierarchy 263
Configuring Border Control Model 264
Configuring Path Protection 264
Configuring an LSP 265
Forcing Reversion of the LSP 267
Configuring Flexible Name-based Tunnel Constraints 268
Assigning Color Names to Numeric Values 268
Associating Affinity-Names with TE Links 270
Associating Affinity Constraints for TE Tunnels 271
Configuring IS-IS to Flood MPLS-TE Link Information 272
Configuring an OSPF Area of MPLS-TE 274
Configuring Explicit Paths with ABRs Configured as Loose Addresses 275
Configuring MPLS-TE Forwarding Adjacency 277
Configuring Unequal Load Balancing 278
Setting Unequal Load Balancing Parameters 278
Enabling Unequal Load Balancing 279
Configuring a Path Computation Client and Element 281
Configuring a Path Computation Client 281
Configuring a Path Computation Element Address 282
Configuring PCE Parameters 283
Configuring Policy-based Tunnel Selection 286
Configuring the Automatic Bandwidth 288
Configuring the Collection Frequency 288
Forcing the Current Application Period to Expire Immediately 290
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Configuring the Automatic Bandwidth Functions 291
Configuring the Shared Risk Link Groups 294
Configuring the SRLG Values of Each Link that has a Shared Risk with Another Link 294
Creating an Explicit Path With Exclude SRLG 296
Using Explicit Path With Exclude SRLG 298
Creating a Link Protection on Backup Tunnel with SRLG Constraint 300
Creating a Node Protection on Backup Tunnel with SRLG Constraint 303
Configuring Point-to-Multipoint TE 307
Enabling Multicast Routing on the Router 307
Configuring the Static Group for the Point-to-Multipoint Interface 309
Configuring Destinations for the Tunnel Interface 311
Disabling Destinations 314
Logging Per Destinations for Point-to-Multipoint 316
Enabling Soft-Preemption on a Node 319
Enabling Soft-Preemption on a Tunnel 320
Configuring Attributes within a Path-Option Attribute 322
Configuring Auto-Tunnel Mesh Tunnel ID 323
Configuring Auto-tunnel Mesh Unused Timeout 324
Configuring Auto-Tunnel Mesh Group 326
Configuring Tunnel Attribute-Set Templates 327
Enabling LDP on Auto-Tunnel Mesh 330
Enabling Stateful PCE Client 331
Configuring VRF Redirection 332
Configuring IPv6 Routing Over IPv4 MPLS-TE Tunnels 334
Configuring Path-selection Cost Limit 336
Configuring Global Path-selection Cost Limit on MPLS TE Tunnels 336
Configuring Path-selection Cost Limit per TE Tunnel 337
Configuring Path-selection Cost Limit per Path-option Attribute-set 338
Enabling Soft-preemption over FRR Backup Tunnels 339
Enabling Auto-onehop Tunnels to Next-hop Neighbors 340
Configuration Examples for Cisco MPLS-TE 342
Configure Fast Reroute and SONET APS: Example 342
Build MPLS-TE Topology and Tunnels: Example 342
Configure IETF DS-TE Tunnels: Example 344
Configure MPLS-TE and Fast-Reroute on OSPF: Example 344
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Configure the Ignore IS-IS Overload Bit Setting in MPLS-TE: Example 344
Configure GMPLS: Example 345
Configure Flexible Name-based Tunnel Constraints: Example 347
Configure an Interarea Tunnel: Example 349
Configure Forwarding Adjacency: Example 349
Configure Unequal Load Balancing: Example 350
Configure PCE: Example 351
Configure Policy-based Tunnel Selection: Example 351
Configure Tunnels for Path Protection: Example 352
Configure Tunnels for Explicit Path Protection: Example 352
Configure Tunnels for Co-existence of Path Protection with Fast Reroute: Example 353
Configure Automatic Bandwidth: Example 353
Configure the MPLS-TE Shared Risk Link Groups: Example 353
Configure the MPLS-TE Auto-Tunnel Backup: Example 356
Configure Point-to-Multipoint TE: Examples 362
Configure Point-to-Multipoint for the Source: Example 363
Configure the Point-to-Multipoint Tunnel: Example 363
Disable a Destination: Example 364
Configure the Point-to-Multipoint Solution: Example 364
Configure MPLS TE Path-selection Cost Limit: Example 368
Additional References 368
CHAPTER 7 Implementing GMPLS UNI 371
Prerequisites for Implementing GMPLS UNI 371
Restrictions for Implementing GMPLS UNI 372
Information About Implementing GMPLS UNI 372
GMPLS UNI vs GMPLS NNI 372
GMPLS LSP Signaling 372
Path Message without an ERO 373
XRO Attribute-set 373
Connection Diversity 373
GMPLS RSVP VRF Signaling 373
DWDM Transponder Integration 374
How to Implement GMPLS UNI 374
Configuring TE for GMPLS UNI 374
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Enabling GMPLS UNI Submode 374
Configuring GMPLS UNI Controller 376
Configuring GMPLS UNI Controller as a Tunnel Head 377
Configuring Other Tunnel Properties for a GMPLS UNI Tunnel 379
Configuring LSP Diversity 381
Configuring XRO Attribute-set 381
Configuring Connection Diversity 382
Configuring LMP for GMPLS UNI 384
Configuring Optical Router ID 384
Configuring an LMP Neighbor 385
Configuring an LMP Controller 387
Configuring RSVP Optical Refresh Interval and Missed Count 388
Configuration Examples for GMPLS UNI 390
Configuring Head UNI-C for a GMPLS Tunnel: Example 390
Configuring Tail UNI-C for a GMPLS Tunnel: Example 391
Configuring LSP Diversity: Example 391
Additional References 392
CHAPTER 8 Implementing MPLS OAM 395
Prerequisites for MPLS LSP Ping and Traceroute for P2MP 395
MPLS Network Management with MPLS LSP Ping and MPLS LSP Traceroute 396
Roles of Various Routers 396
P2MP Ping 397
P2MP Traceroute 398
MPLS OAM Support for BGP 3107 399
Configure the Ping and Traceroute: Example 399
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Preface
The Cisco IOS XR MPLS Configuration Guide for the Cisco CRS-1 Router preface contains these sections:
•Changes to This Document, page xvii
•Obtaining Documentation and Submitting a Service Request, page xvii
Changes to This Document
This table lists the technical changes made to this document since it was first printed.
Table 1: Changes to This Document
Change SummaryDate
Republished with documentation updates for Cisco
IOS XR Release 5.1.3 features.
Sep 2014
Republished with documentation updates for Cisco
IOS XR Release 5.1.2 features.
May 2014
Initial release of this document.January 2014
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a service
request, and gathering additional information, see What's New in Cisco Product Documentation, at: http://
www.cisco.com/c/en/us/td/docs/general/whatsnew/whatsnew.html.
Subscribe to What's New in Cisco Product Documentation, which lists all new and revised Cisco technical
documentation as an RSS feed and delivers content directly to your desktop using a reader application. The
RSS feeds are a free service.
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Preface
Obtaining Documentation and Submitting a Service Request

CHAPTER 1
New and Changed Feature Information in Cisco
IOS XR Release 5.1.x
This table summarizes the new and changed feature information for the Cisco IOS XR MPLS Configuration
Guide for the Cisco CRS Router, and tells you where they are documented.
For a complete list of new and changed features in Cisco IOS XR Software, Release 5.1.x, see the document.
•New and Changed Feature Information in Cisco IOS XR Release 5.1.x, page 1
New and Changed Feature Information in Cisco IOS XR Release
5.1.x
Table 2: New and Changed Features in Cisco IOS XR Software
Where DocumentedIntroduced/Changed in ReleaseDescriptionFeature
Implementing MPLS Traffic
Engineering chapter:
Stateful Path Computation
Element, on page 208
Release 5.1.1This feature was introduced.Stateful Path Computation
Element
Implementing MPLS Traffic
Engineering chapter:
MPLS TE Extended Admin
Groups, on page 208
Release 5.1.1This feature was introduced.MPLS TE Extended Admin
Groups
Implementing MPLS Traffic
Engineering chapter:
VRF Redirection to MPLS TE
Tunnels, on page 207
Release 5.1.1This feature was introduced.VRF Redirection to MPLS TE
Tunnels
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Where DocumentedIntroduced/Changed in ReleaseDescriptionFeature
Implementing MPLS Traffic
Engineering chapter:
MPLS TE IPv6 Autoroute, on
page 211
Release 5.1.1This feature was introduced.MPLS TE IPv6 Autoroute
Implementing MPLS Traffic
Engineering chapter:
MPLS TE SRLG Scale
Enhancements, on page 203
Release 5.1.1This feature was introduced.MPLS TE SRLG Scale
Enhancements
Implementing MPLS Traffic
Engineering chapter:
MPLS TE Usability
Enhancements, on page 210
Release 5.1.1This feature was introduced.MPLS TE Usability
Enhancements
Implementing MPLS Label
Distribution Protocol chapter:
MPLS LDP Carrier Supporting
Carrier for Multiple VRFs, on
page 21
Release 5.1.1This feature was introduced.MPLS LDP Carrier Supporting
Carrier for Multiple VRFs
Implementing MPLS Traffic
Engineering chapter:
MPLS TE Path Cost Limit, on
page 211
Configuring Path-selection Cost
Limit, on page 336
Configure MPLS TE
Path-selection Cost Limit:
Example, on page 368
Release 5.1.2This feature was introduced.MPLS TE Path Cost Limit
Implementing MPLS Traffic
Engineering chapter:
Soft-preemption over FRR
Backup Tunnels, on page 212
Enabling Soft-preemption over
FRR Backup Tunnels, on page
339
Release 5.1.2This feature was introduced.Soft-preemption over FRR
Backup Tunnels
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New and Changed Feature Information in Cisco IOS XR Release 5.1.x
New and Changed Feature Information in Cisco IOS XR Release 5.1.x