Nokia 7705 SAR-W Series User manual

© 2022 Nokia.
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7705 SERVICE AGGREGATION
ROUTER | RELEASE 22.10.R1
MPLS Guide
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Edition: 01
October 2022
MPLS Guide

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Table of Contents
1 Preface...........................................................................................15
1.1 About This Guide.......................................................................................15
1.1.1 Audience....................................................................................................15
1.1.2 Technical Support......................................................................................16
2 7705 SAR MPLS Configuration Process.....................................17
3 MPLS and RSVP-TE......................................................................19
3.1 Overview....................................................................................................20
3.2 MPLS.........................................................................................................21
3.2.1 Traffic Engineering for MPLS ....................................................................21
3.2.1.1 TE Metric and IGP Metric ..........................................................................22
3.2.2 MPLS Label Stack .....................................................................................23
3.2.2.1 Label Values..............................................................................................24
3.2.3 MPLS Entropy Labels................................................................................26
3.2.3.1 Overview of Entropy Labels.......................................................................26
3.2.3.2 Inserting and Processing the Entropy Label..............................................29
3.2.3.3 Entropy Label on OAM Packets ................................................................31
3.2.3.4 Segment Routing Entropy Label and IPSec, ESPI Hashing, and
NGE...........................................................................................................31
3.2.3.5 Entropy Label Configuration ......................................................................31
3.2.4 Label Edge and Label Switch Routers ......................................................33
3.2.5 LSP Types .................................................................................................34
3.3 RSVP and RSVP-TE .................................................................................36
3.3.1 RSVP-TE Overview ...................................................................................36
3.3.1.1 Using RSVP-TE for MPLS.........................................................................38
3.3.1.2 RSVP-TE Extensions for MPLS ................................................................38
3.3.1.3 Hello Protocol ............................................................................................39
3.3.1.4 Authentication............................................................................................40
3.3.1.5 Non-Router ID Addresses as Destinations and Hops ...............................42
3.3.2 RSVP LSP and LDP FEC Statistics ..........................................................43
3.3.2.1 Configuring RSVP LSP Statistics at Ingress LER .....................................44
3.3.2.2 Configuring RSVP LSP Statistics at Egress LER ......................................45
3.3.2.3 Configuring LDP FEC Statistics.................................................................46
3.4 RSVP-TE Signaling ...................................................................................48
3.4.1 General Attributes of RSVP-TE .................................................................48
3.4.1.1 Bidirectional Forwarding Detection............................................................49
3.4.1.2 Timers........................................................................................................49
3.4.1.3 LSP Resignal Limit ....................................................................................50
3.4.1.4 RSVP-TE Message Pacing .......................................................................50
3.4.1.5 RSVP-TE Overhead Refresh Reduction ...................................................51
3.4.1.6 RSVP-TE Reservation Styles ....................................................................52
3.4.1.7 Implicit Null Label ......................................................................................52
3.4.1.8 RSVP-TE Entropy Labels ..........................................................................53
3.5 LSP Redundancy.......................................................................................54

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3.5.1 Make-Before-Break (MBB) Procedures for LSP and Path
Parameter Configuration Changes ............................................................55
3.5.2 Automatic Creation of RSVP-TE LSPs......................................................56
3.5.3 Automatic Creation of RSVP-TE LSP Mesh (Auto-LSP)...........................56
3.5.3.1 Multi-Area and Multi-Instance Support ......................................................58
3.5.3.2 Mesh LSP Name Encoding .......................................................................59
3.5.4 Automatic Creation of an RSVP-TE Single-Hop LSP................................59
3.5.5 Automatic ABR Selection for Inter-area LSPs ...........................................61
3.5.5.1 Rerouting of Inter-area LSPs.....................................................................63
3.5.5.2 Behavior of MPLS Options in Inter-area LSPs ..........................................64
3.5.5.3 Inter-area LSP Support of OSPF Virtual Links ..........................................65
3.5.6 ABR FRR Protection for Inter-area LSP ....................................................65
3.6 Preference Option for Standby Secondary LSP Paths..............................68
3.7 RSVP-TE Fast Reroute (FRR) ..................................................................69
3.7.1 FRR Terminology ......................................................................................70
3.7.2 Bypass Resignal Timer .............................................................................72
3.7.3 FRR Behavior ............................................................................................73
3.7.4 Dynamic and Manual Bypass LSPs ..........................................................74
3.7.4.1 Bypass LSP Selection Rules for the PLR..................................................74
3.7.4.2 FRR Node Protection (Facility Backup).....................................................77
3.7.5 Admin Group Support on Facility Bypass Backup LSPs ...........................78
3.7.6 FRR Over Unnumbered Interfaces............................................................79
3.8 Shared Risk Link Groups...........................................................................80
3.8.1 SRLGs for Secondary LSP Paths..............................................................80
3.8.2 SRLGs for FRR LSP Paths .......................................................................81
3.8.3 Disjoint and Non-disjoint Paths..................................................................81
3.8.4 Enabling Disjoint Backup Paths.................................................................82
3.9 RSVP-TE Graceful Shutdown ...................................................................85
3.10 RSVP-TE Support for Unnumbered Interfaces..........................................86
3.11 PCEP Support for RSVP-TE LSPs............................................................88
3.12 Segment Routing with Traffic Engineering (SR-TE) ..................................89
3.12.1 SR-TE Support ..........................................................................................90
3.12.2 SR-TE LSP Instantiation............................................................................91
3.12.2.1 PCC-initiated and PCC-controlled LSPs ...................................................93
3.12.2.2 PCC-initiated and PCE-computed/controlled LSP.....................................98
3.12.3 SR-TE LSP Path Computation ................................................................100
3.12.3.1 Service and Shortcut Application SR-TE Label Stack Check .................102
3.12.4 SR-TE LSP Paths Using Explicit SIDs ....................................................104
3.12.5 SR-TE LSP Protection.............................................................................105
3.12.5.1 Local Protection.......................................................................................107
3.12.5.2 End-to-End Protection .............................................................................108
3.12.6 Seamless BFD for SR-TE LSPs .............................................................108
3.12.6.1 Configuration of S-BFD on SR-TE LSPs .................................................109
3.12.6.2 Support for BFD Failure Action with SR-TE LSPs...................................110
3.12.6.3 S-BFD Operational Considerations .........................................................112
3.12.7 Static Route Resolution Using SR-TE LSPs ...........................................112
3.12.8 BGP Label Route Resolution Using SR-TE LSPs ...................................113
3.12.9 Service Packet Forwarding Using SR-TE LSPs ......................................113
3.12.10 Data Path Support...................................................................................115

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3.12.10.1 SR-TE LSP Metric and MTU Settings .....................................................117
3.12.11 SR-TE Entropy Labels.............................................................................119
3.13 Weighted ECMP by RSVP-TE or SR-TE LSPs .......................................120
3.13.1 Weighted ECMP for VPRN Services with Auto-bind ...............................121
3.13.2 Weighted ECMP for EVPN......................................................................121
3.13.3 Weighted ECMP for SDPs ......................................................................122
3.14 MPLS Service Usage ..............................................................................123
3.14.1 Service Destination Points.......................................................................123
3.15 MPLS and RSVP-TE Configuration Process Overview...........................124
3.16 Configuration Notes.................................................................................125
3.17 Configuring MPLS and RSVP-TE with CLI..............................................127
3.18 MPLS Configuration Overview ................................................................128
3.18.1 Router Interface.......................................................................................128
3.18.1.1 E-LSP for Differentiated Services............................................................128
3.18.2 Paths .......................................................................................................128
3.18.3 LSPs ........................................................................................................129
3.18.4 Pseudowires ............................................................................................129
3.18.5 Signaling Protocol....................................................................................130
3.19 Basic MPLS Configuration.......................................................................131
3.20 Common Configuration Tasks .................................................................133
3.20.1 Configuring MPLS Components ..............................................................133
3.20.2 Configuring Global MPLS Parameters ....................................................134
3.20.3 Configuring an MPLS Interface ...............................................................135
3.20.4 Configuring MPLS Paths .........................................................................136
3.20.5 Configuring an MPLS LSP.......................................................................137
3.20.6 Configuring a Static LSP .........................................................................137
3.20.6.1 Configuring a Fast-Retry Timer for Static LSPs ......................................138
3.20.7 Configuring Manual Bypass Tunnels.......................................................138
3.20.8 Configuring RSVP-TE Parameters and Interfaces ..................................140
3.20.9 Configuring RSVP-TE Message Pacing Parameters ..............................141
3.21 MPLS Configuration Management Tasks................................................142
3.21.1 Deleting MPLS.........................................................................................142
3.21.2 Modifying MPLS Parameters...................................................................142
3.21.3 Modifying an MPLS LSP..........................................................................143
3.21.4 Modifying MPLS Path Parameters ..........................................................143
3.21.5 Modifying MPLS Static LSP Parameters .................................................144
3.21.6 Deleting an MPLS Interface.....................................................................144
3.22 RSVP-TE Configuration Management Tasks ..........................................146
3.22.1 Modifying RSVP-TE Parameters .............................................................146
3.22.2 Modifying RSVP-TE Message Pacing Parameters .................................147
3.22.3 Deleting an Interface from RSVP-TE.......................................................147
3.23 Configuring and Operating SR-TE...........................................................148
3.23.1 SR-TE Configuration Prerequisites .........................................................148
3.23.2 SR-TE LSP Configuration Overview........................................................149
3.23.3 Configuring Path Computation and Control for
SR-TE LSPs ............................................................................................150
3.23.3.1 Configuring Path Profile and Group for PCC-initiated and PCE-
computed/controlled LSPs.......................................................................150
3.23.4 Configuring SR-TE LSP Label Stack Size...............................................151

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3.23.5 Configuring Adjacency SID Parameters ..................................................151
3.23.6 Configuring PCC-controlled, PCE-computed, and PCE-controlled
SR-TE LSPs ............................................................................................152
3.24 MPLS and RSVP-TE Command Reference ............................................155
3.24.1 Command Hierarchies.............................................................................155
3.24.1.1 MPLS Commands ...................................................................................156
3.24.1.2 RSVP-TE Commands..............................................................................159
3.24.1.3 Show Commands ....................................................................................160
3.24.1.4 Clear Commands.....................................................................................161
3.24.1.5 Monitor Commands .................................................................................161
3.24.1.6 Debug Commands...................................................................................162
3.24.2 Command Descriptions ...........................................................................164
3.24.2.1 Configuration Commands (MPLS)...........................................................165
3.24.2.2 Configuration Commands (RSVP-TE).....................................................217
3.24.2.3 Show Commands (MPLS) .......................................................................233
3.24.2.4 Show Commands (MPLS-Labels) ...........................................................271
3.24.2.5 Show Commands (Seamless BFD).........................................................275
3.24.2.6 Show Commands (RSVP) .......................................................................276
3.24.2.7 Clear Commands.....................................................................................287
3.24.2.8 Monitor Commands .................................................................................289
3.24.2.9 Debug Commands...................................................................................296
4 PCEP ............................................................................................305
4.1 Introduction to the Path Computation Element (PCE)
Communication Protocol (PCEP) ............................................................306
4.2 Base Implementation of Path Computation Elements (PCE) ..................310
4.3 PCEP Session Establishment and Maintenance.....................................313
4.4 PCEP Parameters ...................................................................................315
4.4.1 PCC Configuration...................................................................................315
4.4.2 Stateful PCE ............................................................................................316
4.4.3 PCEP Extensions in Support of SR-TE LSPs .........................................318
4.4.4 LSP Initiation ...........................................................................................319
4.4.5 PCC-Initiated and PCE-Computed or PCE-Controlled LSPs ..................321
4.5 PCEP Support for RSVP-TE LSPs..........................................................324
4.5.1 RSVP-TE LSP Configuration for a PCC Router ......................................324
4.5.2 Behavior of the LSP Path Update............................................................326
4.5.2.1 Path Update with Empty ERO .................................................................327
4.5.3 Behavior of LSP MBB..............................................................................327
4.5.3.1 PCC-Controlled LSPs..............................................................................328
4.5.3.2 PCE-Computed LSPs..............................................................................328
4.5.3.3 PCE-Controlled LSPs ..............................................................................329
4.5.4 Behavior of Secondary LSP Paths ..........................................................332
4.5.5 PCE Path Profile Support ........................................................................332
4.6 LSP Path Diversity and Bidirectionality Constraints ................................334
4.7 NSP and VSR-NRC PCE Redundancy ...................................................337
4.7.1 Feature Configuration..............................................................................337
4.7.2 NSP Ecosystem Redundancy .................................................................337
4.7.2.1 NSP Cluster Redundancy........................................................................339
4.7.2.2 VSR-NRC Redundancy ...........................................................................339

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4.7.2.3 PCC Behavior..........................................................................................340
4.8 Configuring RSVP-TE LSPs with PCEP Using the CLI ...........................343
4.8.1 PCEP on the PCE Node and the PCC Node...........................................343
4.8.2 MPLS on the PCC Node..........................................................................346
4.9 PCEP Configuration Command Reference .............................................351
4.9.1 Command Hierarchies.............................................................................351
4.9.1.1 PCEP Commands ...................................................................................352
4.9.1.2 Show Commands ....................................................................................352
4.9.2 Command Descriptions ...........................................................................353
4.9.2.1 PCEP Commands ...................................................................................354
4.9.2.2 Show Commands ....................................................................................359
5 Label Distribution Protocol .......................................................367
5.1 Label Distribution Protocol.......................................................................368
5.1.1 LDP and MPLS........................................................................................369
5.1.1.1 BFD for T-LDP.........................................................................................370
5.1.2 LDP Architecture .....................................................................................370
5.1.3 LDP Subsystem Interrelationships ..........................................................371
5.1.3.1 Memory Manager and LDP .....................................................................371
5.1.3.2 Label Manager.........................................................................................371
5.1.3.3 LDP Configuration ...................................................................................372
5.1.3.4 Logger .....................................................................................................373
5.1.3.5 Service Manager .....................................................................................373
5.1.4 Execution Flow ........................................................................................373
5.1.4.1 Initialization..............................................................................................373
5.1.4.2 Session Lifetime ......................................................................................373
5.1.5 Label Exchange.......................................................................................375
5.1.5.1 Implicit Null Label ....................................................................................375
5.1.5.2 Other Reasons for Label Actions.............................................................375
5.1.5.3 Cleanup ...................................................................................................376
5.1.6 LDP Filters...............................................................................................376
5.1.7 LDP FEC Statistics ..................................................................................377
5.1.8 Multi-area and Multi-instance Extensions to LDP....................................377
5.1.9 ECMP Support for LDP ...........................................................................378
5.1.9.1 Label Operations .....................................................................................381
5.1.10 Graceful Restart Helper...........................................................................382
5.1.11 Graceful Handling of Resource Exhaustion.............................................382
5.1.12 LDP Support for Unnumbered Interfaces ................................................383
5.1.13 LDP Fast Reroute (FRR) .........................................................................385
5.1.13.1 ECMP vs FRR .........................................................................................387
5.1.13.2 IGP Shortcuts (RSVP-TE Tunnels) .........................................................387
5.1.13.3 LDP FRR Configuration...........................................................................387
5.1.14 LDP-to-Segment Routing Stitching for IPv4 /32 Prefixes (IS-IS).............388
5.1.14.1 Stitching in the LDP-to-SR Direction .......................................................390
5.1.14.2 Stitching in the SR-to-LDP Direction .......................................................391
5.1.14.3 TTL Propagation and ICMP Tunneling ....................................................393
5.1.15 LDP FRR Remote LFA and TI-LFA Backup Using an SR Tunnel for
IPv4 /32 Prefixes (IS-IS) ..........................................................................393
5.1.15.1 Feature Behavior ....................................................................................394

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5.1.16 TCP MD5 Authentication .........................................................................394
5.2 LDP Point-to-Multipoint Support ..............................................................396
5.2.1 LDP Point-to-Multipoint Configuration .....................................................396
5.2.2 LDP Point-to-Multipoint Protocol .............................................................396
5.2.3 Make-Before-Break (MBB) ......................................................................397
5.2.4 ECMP Support.........................................................................................397
5.2.5 Inter-AS Non-segmented mLDP..............................................................397
5.2.5.1 LDP Recursive FEC Process ..................................................................397
5.2.5.2 OAM ........................................................................................................402
5.2.5.3 ECMP Support.........................................................................................403
5.2.6 Intra-AS Non-segmented mLDP..............................................................404
5.2.6.1 ABR MoFRR for Intra-AS ........................................................................405
5.2.6.2 Interaction with an Inter-AS Non-segmented mLDP Solution..................405
5.3 Multicast LDP Fast Upstream Switchover ...............................................406
5.3.1 mLDP Fast Upstream Switchover Configuration .....................................406
5.3.2 mLDP Fast Upstream Switchover Behavior ............................................407
5.4 LDP IPv6 .................................................................................................410
5.4.1 Link LDP ..................................................................................................411
5.4.2 Targeted LDP ..........................................................................................412
5.4.3 FEC Resolution .......................................................................................412
5.4.4 LDP Session Capabilities ........................................................................413
5.4.5 LDP Adjacency Capabilities ....................................................................414
5.4.6 IP Address and FEC Distribution.............................................................416
5.4.7 IGP and Static Route Synchronization with LDP.....................................419
5.4.8 BFD Operation.........................................................................................420
5.4.9 Services Using SDP with an LDP IPv6 FEC ...........................................421
5.4.10 Mirror Services ........................................................................................421
5.4.10.1 Configuration at mirror source node ........................................................422
5.4.10.2 Configuration at mirror destination node .................................................422
5.4.11 OAM Support with LDP IPv6 ...................................................................423
5.4.12 Interoperability .........................................................................................424
5.4.12.1 Interoperability with Implementations Compliant with draft- ietf-
mpls-ldp-ipv6 ...........................................................................................424
5.4.12.2 Interoperability with Implementations Compliant with RFC 5036 for
IPv4 LDP Control Plane Only ..................................................................425
5.4.13 Upgrading from IPv4 to IPv6 ..................................................................425
5.5 LDP Process Overview............................................................................427
5.6 Configuration Notes.................................................................................428
5.7 Configuring LDP with CLI ........................................................................429
5.8 LDP Configuration Overview ...................................................................430
5.9 Basic LDP Configuration ........................................................................431
5.10 Common Configuration Tasks .................................................................432
5.10.1 Enabling LDP...........................................................................................432
5.10.2 Configuring Graceful Restart Helper Parameters....................................433
5.10.3 Applying Import and Export Policies........................................................434
5.10.4 Configuring Interface Parameters............................................................435
5.10.5 Specifying Targeted Session Parameters ...............................................436
5.10.6 Specifying Peer Parameters....................................................................437
5.10.7 Configuring LDP Support for Multicast VPN (MVPN) ..............................438

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5.10.8 Configuring LDP Support for LDP-to-SR Stitching ..................................439
5.10.9 Enabling LDP Signaling and Services.....................................................439
5.11 LDP Configuration Management Tasks...................................................441
5.11.1 Disabling LDP..........................................................................................441
5.11.2 Modifying Targeted Session Parameters ................................................441
5.11.3 Modifying Interface Parameters ..............................................................442
5.12 LDP Command Reference ......................................................................445
5.12.1 Command Hierarchies.............................................................................445
5.12.1.1 LDP Commands ......................................................................................446
5.12.1.2 Show Commands ....................................................................................448
5.12.1.3 Monitor Commands .................................................................................451
5.12.1.4 Clear Commands.....................................................................................451
5.12.1.5 Debug Commands...................................................................................451
5.12.2 Command Descriptions ...........................................................................453
5.12.2.1 Configuration Commands........................................................................454
5.12.2.2 Show Commands ....................................................................................482
5.12.2.3 Clear Commands.....................................................................................538
5.12.2.4 Monitor Commands .................................................................................540
5.12.2.5 Debug Commands...................................................................................548
7 Supported Standards and Protocols ........................................579

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List of Tables
2 7705 SAR MPLS Configuration Process.....................................17
Table 1 Configuration Process ..............................................................................17
3 MPLS and RSVP-TE......................................................................19
Table 2 Packet/Label Field Description .................................................................23
Table 3 Ingress Label Values (Pop Labels) ...........................................................25
Table 4 Egress Label Values (Push Labels) .........................................................26
Table 5 Summary of Entropy Label Support .........................................................28
Table 6 FRR Terminology .....................................................................................70
Table 7 Parameter Values for frr-overhead .........................................................102
Table 8 Disabled and Enabled Options for Bypass-Only ....................................139
Table 9 Router MPLS Admin-Group Field Descriptions ......................................233
Table 10 Router MPLS Bypass-Tunnel Field Descriptions ..................................234
Table 11 Router MPLS Interface Field Descriptions ............................................236
Table 12 Router MPLS LSP Field Descriptions .....................................................239
Table 13 MPLS LSP Detailed Field Descriptions ..................................................240
Table 14 Router MPLS LSP Path Detail Field Descriptions ..................................244
Table 15 Router MPLS LSP Path MBB Field Descriptions ..................................248
Table 16 Router MPLS Auto LSP Field Descriptions ............................................249
Table 17 Router MPLS LSP Template Field Descriptions .....................................253
Table 18 Router MPLS Path Field Descriptions ....................................................256
Table 19 Router MPLS SRLG Group Field Descriptions .......................................265
Table 20 Router MPLS Static LSP Field Descriptions ..........................................267
Table 21 Router MPLS Status Field Descriptions ................................................269
Table 22 Router MPLS-Labels Label Field Descriptions ......................................272
Table 23 Router MPLS-Labels Label Range Field Descriptions ..........................273
Table 24 Router MPLS-Labels Summary Field Descriptions ................................273
Table 25 Router RSVP-TE Interface Field Descriptions ........................................277
Table 26 Router RSVP-TE Interface Detail Field Descriptions .............................278
Table 27 Router RSVP-TE Interface Statistics Field Descriptions ........................280
Table 28 Router RSVP-TE Neighbor Field Descriptions ......................................282
Table 29 Router RSVP-TE Session Field Descriptions .........................................284
Table 30 Router RSVP-TE Statistics Field Descriptions ......................................284
Table 31 Router RSVP-TE Status Field Descriptions ..........................................286
4 PCEP ............................................................................................305
Table 32 Base PCEP TLVs, Objects, and Messages ............................................310
Table 33 PCEP Stateful PCE Extension TLVs, Objects, and Messages ..............316
Table 34 PCEP Segment Routing Extension Objects and TLVs ...........................319
Table 35 PCEP Path Profile Extension Objects and TLVs ....................................335
Table 36 PCEP PCC Field Descriptions ...............................................................359
Table 37 PCEP PCC Peer Field Descriptions ......................................................362
Table 38 PCEP PCC Status Field Descriptions ...................................................364

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5 Label Distribution Protocol .......................................................367
Table 39 Opaque Types ........................................................................................401
Table 40 OAM Functionality for Option C ..............................................................402
Table 41 Hello Timeout Factor Default Values ......................................................465
Table 42 Keepalive Timeout Factor Default Values ..............................................467
Table 43 LDP Discovery Field Descriptions .........................................................484
Table 44 FEC-Originate Field Descriptions ..........................................................487
Table 45 LDP Interface Field Descriptions ...........................................................489
Table 46 LDP Parameters Field Descriptions .......................................................491
Table 47 LDP Session Field Descriptions ............................................................495
Table 48 LDP Status Field Descriptions ...............................................................497
Table 49 LDP Targeted Peer Field Descriptions ...................................................500
Table 50 LDP Bindings Field Descriptions ...........................................................507
6 List of Acronyms ........................................................................553
Table 51 Acronyms ...............................................................................................553

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List of Figures
3 MPLS and RSVP-TE......................................................................19
Figure 1 Label Structure ..........................................................................................23
Figure 2 Label Packet Placement............................................................................24
Figure 3 Entropy Label and Load Balancing............................................................32
Figure 4 Establishing LSPs......................................................................................37
Figure 5 LSP Using RSVP-TE Path Setup ..............................................................37
Figure 6 Automatic ABR Selection for Inter-Area LSP ............................................62
Figure 7 ABR Protection Using Dynamic Bypass LSP ............................................66
Figure 8 Bypass Tunnel Node Example ..................................................................75
Figure 9 FRR Node-Protection Example .................................................................78
Figure 10 Disjoint Primary and Secondary LSPs.......................................................83
Figure 11 Disjoint FRR Bypass LSPs ........................................................................84
Figure 12 Multi-plane TE with Node Protection .........................................................97
Figure 13 SR-TE LSP Label Stack Programming....................................................116
Figure 14 MPLS and RSVP-TE Configuration and Implementation Flow................124
Figure 15 Manual Bypass Tunnels ..........................................................................139
4 PCEP ............................................................................................305
Figure 16 NSP Functional Modules .........................................................................307
Figure 17 NRC-P Architecture .................................................................................308
Figure 18 PCEP Session Initialization .....................................................................313
Figure 19 NSP Ecosystem Redundancy .................................................................338
Figure 20 Multi-level IS-IS Topology in the NSP GUI ..............................................344
Figure 21 Primary and Secondary RSVP-TE LSP Paths in the NSP GUI...............346
5 Label Distribution Protocol .......................................................367
Figure 22 LDP Subsystem Interrelationships ..........................................................372
Figure 23 Stitching in the LDP-to-SR Direction .......................................................390
Figure 24 mLDP FEC for Single AS with Transit IPv4 Opaque ...............................398
Figure 25 mLDP FEC for Inter-AS with Recursive Opaque Value...........................399
Figure 26 Non-VPN mLDP with Recursive Opaque for Inter-AS.............................400
Figure 27 ASBRs Using EBGP Without IGP ...........................................................401
Figure 28 ECHO Request Target FEC Stack TLV...................................................402
Figure 29 ECMP Support.........................................................................................403
Figure 30 Intra-AS Non-segmented Topology .........................................................405
Figure 31 Multicast LDP Fast Upstream Switchover ...............................................408
Figure 32 LDP Adjacency and Session over an IPv6 Interface ...............................410
Figure 33 LDP IPv6 Address and FEC Distribution Procedure ...............................418
Figure 34 LDP IPv6 Address and FEC Distribution Procedure ...............................419
Figure 35 Smooth Management Transition From IPv4 to IPv6 ...............................426
Figure 36 LDP Configuration and Implementation...................................................427

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MPLS Guide Preface
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1 Preface
1.1 About This Guide
This guide describes the services and protocol support provided by the 7705 SAR
and presents examples to configure and implement MPLS (RSVP-TE and LDP)
protocols.
This guide is organized into functional chapters and provides concepts and
descriptions of the implementation flow, as well as Command Line Interface (CLI)
syntax and command usage.
1.1.1 Audience
This guide is intended for network administrators who are responsible for configuring
the 7705 SAR routers. It is assumed that the network administrators have an
understanding of networking principles and configurations. Concepts described in
this guide include the following:
• Multiprotocol Label Switching (MPLS)
• Resource Reservation Protocol for Traffic Engineering (RSVP-TE)
• Label Distribution Protocol (LDP)
Note: This manual generically covers Release 22.x content and may contain some content
that will be released in later maintenance loads. Please refer to the 7705 SAR 22.x.Rx
Software Release Notes, part number 3HE18702000xTQZZA, for information on features
supported in each load of the Release 22.x software.
Note: As of Release 21.4, software support for the following hardware has been
deprecated:
• 7705 SAR-M 6-port DSL Combination module (3HE05914AA)
• 7705 SAR-M 8-port xDSL module (3HE05577AA)
• 7705 SAR-M GPON module (3HE05126AA)
• 7705 SAR-Wx xDSL variants (3HE07618AA, 3HE07619AA)
These components are no longer recognized in the release.

Preface
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1.1.2 Technical Support
If you purchased a service agreement for your 7705 SAR router and related products
from a distributor or authorized reseller, contact the technical support staff for that
distributor or reseller for assistance. If you purchased a Nokia service agreement,
follow this link to contact a Nokia support representative and to access product
manuals and documentation updates:
Product Support Portal

MPLS Guide 7705 SAR MPLS Configuration Process
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2 7705 SAR MPLS Configuration Process
Table 1 lists the tasks that are required to configure MPLS, RSVP-TE, and LDP
protocols.
This guide is presented in an overall logical configuration flow. Each section
describes a software area and provides CLI syntax and command usage to configure
parameters for a functional area.
Table 1 Configuration Process
Area Task/Description Chapter
Protocol configuration Configure MPLS parameters MPLS
Configure RSVP-TE
parameters
RSVP and RSVP-TE
Configure PCEP parameters PCEP
Configure LDP parameters Label Distribution Protocol
Reference List of security and telecom
standards, supported protocols,
and proprietary MIBs
Supported Standards and Protocols

7705 SAR MPLS Configuration Process
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MPLS Guide MPLS and RSVP-TE
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3 MPLS and RSVP-TE
This chapter provides information required to configure Multiprotocol Label Switching
(MPLS) and Resource Reservation Protocol for Traffic Engineering (RSVP-TE) for
the 7705 SAR. For information on dynamic LSPs with LDP, refer to the chapter Label
Distribution Protocol.
Topics in this chapter include:
•Overview
•MPLS
•RSVP and RSVP-TE
•RSVP-TE Signaling
•LSP Redundancy
•Preference Option for Standby Secondary LSP Paths
•RSVP-TE Fast Reroute (FRR)
•Shared Risk Link Groups
•RSVP-TE Graceful Shutdown
•RSVP-TE Support for Unnumbered Interfaces
•PCEP Support for RSVP-TE LSPs
•Segment Routing with Traffic Engineering (SR-TE)
•Weighted ECMP by RSVP-TE or SR-TE LSPs
•MPLS Service Usage
•MPLS and RSVP-TE Configuration Process Overview
•Configuration Notes
•Configuring MPLS and RSVP-TE with CLI
•MPLS and RSVP-TE Command Reference

MPLS and RSVP-TE
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3.1 Overview
The 7705 SAR provides MPLS technology using static LSPs, RSVP-TE for
traffic-engineered signaled routing of LSPs and LDP for non-traffic-engineered
signaled routing of LSPs. A network operator may choose to use any combination of
static LSPs, RSVP-TE, and LDP to establish paths for services. RSVP-TE and LDP
are considered to be Layer 2.5 protocols.
The 7705 SAR can be used as an ingress and egress Label Edge Router (iLER and
eLER), and as a transit router. A transit router is also referred to as a Label Switch
Router (LSR).
OSPF and IS-IS are the interior gateway protocols with traffic engineering extensions
(IGP-TE) available to the 7705 SAR. These are the Layer 3 protocols. Typically, one
or the other of these gateway protocols will be in use in the network. Whichever
protocol is the chosen gateway protocol, it must be working in order for LDP or
RSVP-TE to function. These Layer 3 protocols identify the next hop, which is
information needed by the Layer 2.5 protocols (LDP or RSVP-TE) in order to assign
labels.
In addition, the 7705 SAR provides link and node redundancy protection through
LSP redundancy and Fast Reroute (FRR) features.
The LSP redundancy and FRR features have the ability to take shared risk link
groups (SRLGs) into consideration when the Constrained Shortest Path First (CSPF)
algorithm is used to determine an alternate LSP. The selection of a route is
determined by the IGP-TE protocol. The added constraints imposed by SRLGs and
CSPF ensure that the redundant route selected will be unique from the principal
route (route being protected); that is, it will use physical equipment that is different
from the equipment that carries the principal route. CSPF will constrain the alternate
route to be the shortest possible alternative route. There may be more than one
alternative route.