Cisco ASR 9000 Series User manual

Cisco ASR 9000 Series Aggregation Services Router MPLS
Configuration Guide, Release 4.3.x
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Text Part Number: OL-28381-02

©2014 Cisco Systems, Inc. All rights reserved.

CONTENTS
Preface Preface xv
Changes to This Document xv
Obtaining Documentation and Submitting a Service Request xv
CHAPTER 1 New and Changed Feature Information in Cisco IOS XR Release 4.3.x 1
New and Changed Feature Information in Cisco IOS XR Release 4.3.x 1
CHAPTER 2 Implementing MPLS Label Distribution Protocol 5
Prerequisites for Implementing Cisco MPLS LDP 6
Information About Implementing Cisco MPLS LDP 6
Overview of Label Distribution Protocol 6
Label Switched Paths 6
LDP Control Plane 6
Exchanging Label Bindings 8
LDP Forwarding 9
LDP Graceful Restart 10
Control Plane Failure 11
Phases in Graceful Restart 12
Recovery with Graceful-Restart 13
Label Advertisement Control (Outbound Filtering) 14
Label Acceptance Control (Inbound Filtering) 14
Local Label Allocation Control 15
Session Protection 15
IGP Synchronization 16
IGP Auto-configuration 17
LDP Nonstop Routing 17
IP LDP Fast Reroute Loop Free Alternate 18
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Downstream on Demand 19
Explicit-Null and Implicit-Null Labels 20
How to Implement MPLS LDP 20
Configuring LDP Discovery Parameters 21
Configuring LDP Discovery Over a Link 22
Configuring LDP Discovery for Active Targeted Hellos 24
Configuring LDP Discovery for Passive Targeted Hellos 26
Configuring Label Advertisement Control (Outbound Filtering) 27
Setting Up LDP Neighbors 29
Setting Up LDP Forwarding 31
Setting Up LDP NSF Using Graceful Restart 33
Configuring Label Acceptance Control (Inbound Filtering) 35
Configuring Local Label Allocation Control 37
Configuring Session Protection 38
Configuring LDP IGP Synchronization: OSPF 39
Configuring LDP IGP Synchronization: ISIS 40
Enabling LDP Auto-Configuration for a Specified OSPF Instance 42
Enabling LDP Auto-Configuration in an Area for a Specified OSPF Instance 44
Disabling LDP Auto-Configuration 45
Configuring LDP Nonstop Routing 47
Configuring LDP Downstream on Demand mode 48
Redistributing MPLS LDP Routes into BGP 49
Setting Up Implicit-Null-Override Label 51
Configuration Examples for Implementing MPLS LDP 52
Configuring LDP with Graceful Restart: Example 52
Configuring LDP Discovery: Example 52
Configuring LDP Link: Example 52
Configuring LDP Discovery for Targeted Hellos: Example 53
Configuring Label Advertisement (Outbound Filtering): Example 53
Configuring LDP Neighbors: Example 54
Configuring LDP Forwarding: Example 54
Configuring LDP Nonstop Forwarding with Graceful Restart: Example 54
Configuring Label Acceptance (Inbound Filtering): Example 55
Configuring Local Label Allocation Control: Example 55
Configuring LDP Session Protection: Example 55
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Configuring LDP IGP Synchronization—OSPF: Example 56
Configuring LDP IGP Synchronization—ISIS: Example 56
Configuring LDP Auto-Configuration: Example 56
Configure IP LDP Fast Reroute Loop Free Alternate: Examples 57
Verify IP LDP Fast Reroute Loop Free Alternate: Example 58
Additional References 61
CHAPTER 3 Implementing RSVP for MPLS-TE 63
Prerequisites for Implementing RSVP for MPLS-TE 64
Information About Implementing RSVP for MPLS-TE 64
Overview of RSVP for MPLS-TE 64
LSP Setup 65
High Availability 65
Graceful Restart 65
Graceful Restart: Standard and Interface-Based 66
Graceful Restart: Figure 67
ACL-based Prefix Filtering 68
RSVP MIB 68
Bandwidth Reservation Percentage 69
Information About Implementing RSVP Authentication 69
RSVP Authentication Functions 69
RSVP Authentication Design 69
Global, Interface, and Neighbor Authentication Modes 70
Security Association 71
Key-source Key-chain 72
Guidelines for Window-Size and Out-of-Sequence Messages 73
Caveats for Out-of-Sequence 73
How to Implement RSVP 74
Configuring Traffic Engineering Tunnel Bandwidth 74
Confirming DiffServ-TE Bandwidth 74
Enabling Graceful Restart 76
Configuring ACL-based Prefix Filtering 77
Configuring ACLs for Prefix Filtering 77
Configuring RSVP Packet Dropping 78
Verifying RSVP Configuration 80
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Enabling RSVP Traps 83
How to Implement RSVP Authentication 84
Configuring Global Configuration Mode RSVP Authentication 84
Enabling RSVP Authentication Using the Keychain in Global Configuration Mode 84
Configuring a Lifetime for RSVP Authentication in Global Configuration Mode 86
Configuring the Window Size for RSVP Authentication in Global Configuration
Mode 87
Configuring an Interface for RSVP Authentication 88
Specifying the RSVP Authentication Keychain in Interface Mode 88
Configuring a Lifetime for an Interface for RSVP Authentication 90
Configuring the Window Size for an Interface for RSVP Authentication 91
Configuring RSVP Neighbor Authentication 92
Specifying the Keychain for RSVP Neighbor Authentication 93
Configuring a Lifetime for RSVP Neighbor Authentication 94
Configuring the Window Size for RSVP Neighbor Authentication 95
Verifying the Details of the RSVP Authentication 97
Eliminating Security Associations for RSVP Authentication 97
Configuration Examples for RSVP 97
Bandwidth Configuration (Prestandard): Example 97
Bandwidth Configuration (MAM): Example 97
Bandwidth Configuration (RDM): Example 98
Refresh Reduction and Reliable Messaging Configuration: Examples 98
Refresh Interval and the Number of Refresh Messages Configuration: Example 98
Retransmit Time Used in Reliable Messaging Configuration: Example 99
Acknowledgement Times Configuration: Example 99
Summary Refresh Message Size Configuration: Example 99
Disable Refresh Reduction: Example 99
Configure Graceful Restart: Examples 99
Enable Graceful Restart: Example 100
Enable Interface-Based Graceful Restart: Example 100
Change the Restart-Time: Example 100
Change the Hello Interval: Example 100
Configure ACL-based Prefix Filtering: Example 100
Set DSCP for RSVP Packets: Example 101
Enable RSVP Traps: Example 101
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Configuration Examples for RSVP Authentication 101
RSVP Authentication Global Configuration Mode: Example 102
RSVP Authentication for an Interface: Example 102
RSVP Neighbor Authentication: Example 103
RSVP Authentication by Using All the Modes: Example 103
Additional References 104
CHAPTER 4 Implementing MPLS Forwarding 107
Prerequisites for Implementing Cisco MPLS Forwarding 107
Restrictions for Implementing Cisco MPLS Forwarding 108
Information About Implementing MPLS Forwarding 108
MPLS Forwarding Overview 108
Label Switching Functions 108
Distribution of Label Bindings 109
MFI Control-Plane Services 109
MFI Data-Plane Services 109
MPLS Maximum Transmission Unit 110
Label Security for BGP Inter-AS Option-B 110
How to Implement MPLS Forwarding 110
Configuring MPLS Label Security 110
Additional References 111
CHAPTER 5 Implementing MPLS Traffic Engineering 113
Prerequisites for Implementing Cisco MPLS Traffic Engineering 114
Restrictions for Implementing GMPLS UNI 115
Information About Implementing MPLS Traffic Engineering 115
Overview of MPLS Traffic Engineering 115
Benefits of MPLS Traffic Engineering 115
How MPLS-TE Works 116
MPLS Traffic Engineering 117
Backup AutoTunnels 117
AutoTunnel Attribute-set 118
Link Protection 118
Node Protection 118
Backup AutoTunnel Assignment 119
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Explicit Paths 120
Periodic Backup Promotion 120
Protocol-Based CLI 121
Differentiated Services Traffic Engineering 121
Prestandard DS-TE Mode 121
IETF DS-TE Mode 121
Bandwidth Constraint Models 122
Maximum Allocation Bandwidth Constraint Model 122
Russian Doll Bandwidth Constraint Model 122
TE Class Mapping 123
Flooding 123
Flooding Triggers 123
Flooding Thresholds 124
Fast Reroute 124
MPLS-TE and Fast Reroute over Link Bundles 125
Ignore Intermediate System-to-Intermediate System Overload Bit Setting in MPLS-TE 125
Flexible Name-based Tunnel Constraints 126
MPLS Traffic Engineering Interarea Tunneling 127
Interarea Support 127
Multiarea Support 128
Loose Hop Expansion 128
Loose Hop Reoptimization 129
ABR Node Protection 129
Fast Reroute Node Protection 129
MPLS-TE Forwarding Adjacency 129
MPLS-TE Forwarding Adjacency Benefits 130
MPLS-TE Forwarding Adjacency Restrictions 130
MPLS-TE Forwarding Adjacency Prerequisites 130
Path Computation Element 130
Policy-Based Tunnel Selection 132
Policy-Based Tunnel Selection 132
Policy-Based Tunnel Selection Functions 132
PBTS Forward Class 133
PBTS Restrictions 134
PBTS Default Class Enhancement 134
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Path Protection 135
Pre-requisites for Path Protection 135
Restrictions for Path Protection 136
Restrictions for Explicit Path Protection 137
Co-existence of Path Protection with Fast Reroute 137
MPLS-TE Automatic Bandwidth 137
MPLS-TE Automatic Bandwidth Overview 138
Adjustment Threshold 139
Overflow Detection 139
Restrictions for MPLS-TE Automatic Bandwidth 140
Point-to-Multipoint Traffic-Engineering 140
Point-to-Multipoint Traffic-Engineering Overview 140
Point-to-Multipoint RSVP-TE 142
Point-to-Multipoint Fast Reroute 142
Point-to-Multipoint Label Switch Path 143
Path Option for Point-to-Multipoint RSVP-TE 143
MPLS Traffic Engineering Shared Risk Link Groups 145
Explicit Path 145
Fast ReRoute with SRLG Constraints 146
Importance of Protection 148
Delivery of Packets During a Failure 149
Multiple Backup Tunnels Protecting the Same Interface 149
Weighted-SRLG Auto-backup Path Computation 149
SRLG Limitations 150
Soft-Preemption 150
Path Option Attributes 151
Configuration Hierarchy of Path Option Attributes 151
Traffic Engineering Bandwidth and Bandwidth Pools 152
Path Option Switchover 152
Path Option and Path Protection 153
Auto-Tunnel Mesh 153
Destination List (Prefix-List) 154
How to Implement Traffic Engineering 155
Building MPLS-TE Topology 155
Creating an MPLS-TE Tunnel 158
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Configuring Forwarding over the MPLS-TE Tunnel 160
Protecting MPLS Tunnels with Fast Reroute 162
Enabling an AutoTunnel Backup 167
Removing an AutoTunnel Backup 168
Establishing MPLS Backup AutoTunnels to Protect Fast Reroutable TE LSPs 169
Establishing Next-Hop Tunnels with Link Protection 171
Configuring a Prestandard DS-TE Tunnel 173
Configuring an IETF DS-TE Tunnel Using RDM 175
Configuring an IETF DS-TE Tunnel Using MAM 178
Configuring MPLS -TE and Fast-Reroute on OSPF 181
Configuring the Ignore Integrated IS-IS Overload Bit Setting in MPLS-TE 182
Configuring Flexible Name-based Tunnel Constraints 183
Assigning Color Names to Numeric Values 184
Associating Affinity-Names with TE Links 185
Associating Affinity Constraints for TE Tunnels 186
Configuring IS-IS to Flood MPLS-TE Link Information 188
Configuring an OSPF Area of MPLS-TE 189
Configuring Explicit Paths with ABRs Configured as Loose Addresses 191
Configuring MPLS-TE Forwarding Adjacency 192
Configuring a Path Computation Client and Element 193
Configuring a Path Computation Client 193
Configuring a Path Computation Element Address 195
Configuring PCE Parameters 196
Configuring Policy-based Tunnel Selection 198
Configuring Forwarding Path 200
Configuring Path Protection on MPLS-TE 201
Enabling Path Protection for an Interface 202
Assigning a Dynamic Path Option to a Tunnel 203
Forcing a Manual Switchover on a Path-Protected Tunnel 204
Configuring the Delay the Tunnel Takes Before Reoptimization 205
Configuring the Automatic Bandwidth 207
Configuring the Collection Frequency 207
Forcing the Current Application Period to Expire Immediately 208
Configuring the Automatic Bandwidth Functions 209
Configuring the Shared Risk Link Groups 212
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Configuring the SRLG Values of Each Link that has a Shared Risk with Another Link 212
Creating an Explicit Path With Exclude SRLG 214
Using Explicit Path With Exclude SRLG 216
Creating a Link Protection on Backup Tunnel with SRLG Constraint 218
Creating a Node Protection on Backup Tunnel with SRLG Constraint 221
Configuring Default Admin Weight 225
Configuring Static SRLG Value to Topology Link 226
Configuring Admin-Weight Associated with an SRLG Value 227
Configuring Point-to-Multipoint TE 228
Enabling Multicast Routing on the Router 228
Configuring the Static Group for the Point-to-Multipoint Interface 230
Configuring Destinations for the Tunnel Interface 232
Disabling Destinations 235
Logging Per Destinations for Point-to-Multipoint 237
Enabling Soft-Preemption on a Node 239
Enabling Soft-Preemption on a Tunnel 241
Configuring Attributes within a Path-Option Attribute 242
Configuring Auto-Tunnel Mesh Tunnel ID 244
Configuring Auto-tunnel Mesh Unused Timeout 245
Configuring Auto-Tunnel Mesh Group 246
Configuring Tunnel Attribute-Set Templates 248
Enabling LDP on Auto-Tunnel Mesh 250
Configuration Examples for Cisco MPLS-TE 251
Build MPLS-TE Topology and Tunnels: Example 252
Configure IETF DS-TE Tunnels: Example 253
Configure MPLS-TE and Fast-Reroute on OSPF: Example 254
Configure the Ignore IS-IS Overload Bit Setting in MPLS-TE: Example 254
Configure Flexible Name-based Tunnel Constraints: Example 255
Configure an Interarea Tunnel: Example 256
Configure Forwarding Adjacency: Example 257
Configure PCE: Example 257
Configure Tunnels for Path Protection: Example 258
Configure Tunnels for Explicit Path Protection: Example 258
Configure Tunnels for Co-existence of Path Protection with Fast Reroute: Example 259
Configure Automatic Bandwidth: Example 259
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Configure the MPLS-TE Shared Risk Link Groups: Example 259
Configure the MPLS-TE Auto-Tunnel Backup: Example 262
Configure Point-to-Multipoint TE: Examples 268
P2MP Topology Scenario: Example 269
Configure Point-to-Multipoint for the Source: Example 270
Configure the Point-to-Multipoint Tunnel: Example 271
Disable a Destination: Example 271
Configure the Point-to-Multipoint Solution: Example 272
Additional References 275
CHAPTER 6 Implementing GMPLS UNI 277
Prerequisites for Implementing GMPLS UNI 277
Restrictions for Implementing GMPLS UNI 278
Information About Implementing GMPLS UNI 278
GMPLS UNI vs GMPLS NNI 278
GMPLS LSP Signaling 278
Path Message without an ERO 279
XRO Attribute-set 279
Connection Diversity 279
DWDM Transponder Integration 279
How to Implement GMPLS UNI 280
Configuring TE for GMPLS UNI 280
Enabling GMPLS UNI Submode 280
Configuring GMPLS UNI Controller 281
Configuring GMPLS UNI Controller as a Tunnel Head 282
Configuring Other Tunnel Properties for a GMPLS UNI Tunnel 284
Configuring LSP Diversity 286
Configuring XRO Attribute-set 287
Configuring Connection Diversity 288
Configuring LMP for GMPLS UNI 289
Configuring Optical Router ID 289
Configuring an LMP Neighbor 291
Configuring an LMP Controller 292
Configuring RSVP Optical Refresh Interval and Missed Count 294
Configuration Examples for GMPLS UNI 295
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Configuring Head UNI-C for a GMPLS Tunnel: Example 296
Configuring Tail UNI-C for a GMPLS Tunnel: Example 296
Configuring LSP Diversity: Example 297
Additional References 297
CHAPTER 7 Implementing MPLS OAM 301
Prerequisites for MPLS LSP Ping and Traceroute for P2MP 301
MPLS Network Management with MPLS LSP Ping and MPLS LSP Traceroute 302
Roles of Various Routers 302
P2MP Ping 303
P2MP Traceroute 304
MPLS OAM Support for BGP 3107 305
IP-Less MPLS-TP Ping and MPLS-TP Traceroute 305
Configure the Ping and Traceroute: Example 305
CHAPTER 8 Implementing MPLS Transport Profile 311
Restrictions for MPLS-TP 311
Information About Implementing MPLS Transport Profile 312
MPLS Transport Profile 312
Bidirectional LSPs 313
MPLS-TP Path Protection 313
Fault OAM Support 313
MPLS-TP Links and Physical Interfaces 315
Tunnel LSPs 315
MPLS-TP IP-less support 316
MPLS-TP LSP Wrapping 316
How to Implement MPLS Transport Profile 317
Configuring the Node ID and Global ID 318
Configuring Pseudowire OAM Attributes 319
Configuring the Pseudowire Class 320
Configuring the Pseudowire 321
Configuring the MPLS TP Tunnel 323
Configuring MPLS-TP LSPs at Midpoint 325
Configuring MPLS-TP Links and Physical Interfaces 327
Configuring MPLS-TP LSP Wrapping 328
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Preface
The Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide preface contains these
sections:
•Changes to This Document, page xv
•Obtaining Documentation and Submitting a Service Request, page xv
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 SummaryDateRevision
Republished with documentation
updates for Cisco IOS XR Release
4.3.1 features.
May 2013OL-28381-02
Initial release of this document.December 2012OL-28381-01
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
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Preface
Obtaining Documentation and Submitting a Service Request

CHAPTER 1
New and Changed Feature Information in Cisco
IOS XR Release 4.3.x
This table summarizes the new and changed feature information for the Cisco ASR 9000 Series Aggregation
Services Router MPLS Configuration Guide, and tells you where they are documented.
For a complete list of new and changed features in Cisco IOS XR Software, Release 4.3.x, see the New and
Changed Features in Cisco IOS XR Software, Release 4.3.x for Cisco ASR 9000 Series Aggregation Services
Router document.
•New and Changed Feature Information in Cisco IOS XR Release 4.3.x, page 1
New and Changed Feature Information in Cisco IOS XR Release
4.3.x
Table 2: New and Changed Features in Cisco IOS XR Software
Where DocumentedIntroduced/Changed in ReleaseDescriptionFeature
Implementing MPLS OAM
chapter:
Bandwidth Reservation
Percentage, on page 69
Refer RSVP Infrastructure
Commands chapter in
Cisco ASR 9000 Series
Aggregation Services Router
MPLS Command Reference for
information on the commands
used for configuring Bandwidth
Reservation Percentage.
Release 4.3.1This feature was introduced.Bandwidth Reservation
Percentage
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Where DocumentedIntroduced/Changed in ReleaseDescriptionFeature
Implementing MPLS OAM
chapter:
IP-Less MPLS-TP Ping and
MPLS-TP Traceroute, on page
305
Refer MPLS OAM Commands
chapter in Cisco ASR 9000
Series Aggregation Services
Router MPLS Command
Reference for information on
the commands used for
configuring IP-Less MPLS-TP
Ping and MPLS-TP Traceroute.
Release 4.3.1This feature was introduced.IP-Less MPLS-TP Ping and
MPLS-TP Traceroute
Implementing MPLS
Forwarding chapter:
Label Security for BGP
Inter-AS Option-B , on page
110
Refer MPLS Forwarding
Commands chapter in
Cisco ASR 9000 Series
Aggregation Services Router
MPLS Command Reference for
information on the commands
used for configuring Label
Security for BGP Inter-AS
Option-B.
Release 4.3.1This feature was introduced.Label Security for BGP
Inter-AS Option-B
Implementing MPLS OAM
chapter:
MPLS OAM Support for BGP
3107, on page 305
Release 4.3.1This feature was introduced.MPLS OAM Support for BGP
3107
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New and Changed Feature Information in Cisco IOS XR Release 4.3.x

Where DocumentedIntroduced/Changed in ReleaseDescriptionFeature
Implementing MPLS Transport
Profile chapter:
MPLS-TP LSP Wrapping, on
page 316
Refer MPLS Transport Profile
Commands chapter in
Cisco ASR 9000 Series
Aggregation Services Router
MPLS Command Reference for
information on the commands
used for configuring Label
Security for BGP Inter-AS
Option-B.
Release 4.3.1This feature was introduced.MPLS-TP LSP Wrapping
Implementing MPLS Traffic
Engineering chapter:
Policy-Based Tunnel Selection,
on page 132
Refer MPLS Traffic
Engineering Commands chapter
in Cisco ASR 9000 Series
Aggregation Services Router
MPLS Command Reference for
information on the commands
used for configuring Label
Security for BGP Inter-AS
Option-B.
Release 4.3.1This feature was introduced.Policy-Based Tunnel Selection
Implementing MPLS Traffic
Engineering chapter:
Weighted-SRLG Auto-backup
Path Computation, on page 149
Refer MPLS Traffic
Engineering Commands chapter
in Cisco ASR 9000 Series
Aggregation Services Router
MPLS Command Reference for
information on the commands
used for configuring Label
Security for BGP Inter-AS
Option-B.
Release 4.3.1This feature was introduced.Weighted-SRLG Auto-backup
Path Computation
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New and Changed Feature Information in Cisco IOS XR Release 4.3.x
New and Changed Feature Information in Cisco IOS XR Release 4.3.x

Where DocumentedIntroduced/Changed in ReleaseDescriptionFeature
Implementing GMPLS UNI
chapter:
Implementing GMPLS UNI,
on page 277
Refer GMPLS UNI Commands
chapter in Cisco ASR 9000
Series Aggregation Services
Router MPLS Command
Reference for information on
the commands used for
configuring GMPLS UNI.
Release 4.3.0This feature was introduced.GMPLS UNI
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New and Changed Feature Information in Cisco IOS XR Release 4.3.x