Nokia 7705 SAR-W Series

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MPLS Guide PCEP

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305

4PCEP

This section contains information on the following topics:

• Introduction to the Path Computation Element (PCE) Communication Protocol

(PCEP)

• Base Implementation of Path Computation Elements (PCE)

• PCEP Session Establishment and Maintenance

• PCEP Parameters

• PCEP Support for RSVP-TE LSPs

• LSP Path Diversity and Bidirectionality Constraints

• NSP and VSR-NRC PCE Redundancy

• Configuring RSVP-TE LSPs with PCEP Using the CLI

• PCEP Configuration Command Reference

Main Page

Table of Contents3
Preface15
About this Guide15
Audience15
Technical Support16
7705 SAR MPLS Configuration Process17
MPLS and RSVP-TE19
Overview20
Mpls21
Traffic Engineering for MPLS21
TE Metric and IGP Metric22
MPLS Label Stack23
Table 2 Packet/Label Field Description23
Figure 1 Label Structure23
Label Values24
Figure 2 Label Packet Placement24
Table 3 Ingress Label Values (Pop Labels)25
MPLS Entropy Labels26
Overview of Entropy Labels26
Table 4 Egress Label Values (Push Labels)26
Table 5 Summary of Entropy Label Support28
Inserting and Processing the Entropy Label29
Entropy Label on OAM Packets31
Segment Routing Entropy Label and Ipsec, ESPI Hashing, and NGE31
Entropy Label Configuration31
Figure 3 Entropy Label and Load Balancing32
Label Edge and Label Switch Routers33
LSP Types34
RSVP and RSVP-TE36
RSVP-TE Overview36
Figure 4 Establishing Lsps37
Figure 5 LSP Using RSVP-TE Path Setup37
Using RSVP-TE for MPLS38
RSVP-TE Extensions for MPLS38
Hello Protocol39
Authentication40
Non-Router ID Addresses as Destinations and Hops42
RSVP LSP and LDP FEC Statistics43
Configuring RSVP LSP Statistics at Ingress LER44
Configuring RSVP LSP Statistics at Egress LER45
Configuring LDP FEC Statistics46
RSVP-TE Signaling48
General Attributes of RSVP-TE48
Bidirectional Forwarding Detection49
Timers49
LSP Resignal Limit50
RSVP-TE Message Pacing50
RSVP-TE Overhead Refresh Reduction51
RSVP-TE Reservation Styles52
Implicit Null Label52
RSVP-TE Entropy Labels53
LSP Redundancy54
Make-Before-Break (MBB) Procedures for LSP and Path Parameter Configuration Changes55
Automatic Creation of RSVP-TE Lsps56
Automatic Creation of RSVP-TE LSP Mesh (Auto-LSP)56
Multi-Area and Multi-Instance Support58
Mesh LSP Name Encoding59
Automatic Creation of an RSVP-TE Single-Hop LSP59
Automatic ABR Selection for Inter-Area Lsps61
Figure 6 Automatic ABR Selection for Inter-Area LSP62
Rerouting of Inter-Area Lsps63
Behavior of MPLS Options in Inter-Area Lsps64
Inter-Area LSP Support of OSPF Virtual Links65
ABR FRR Protection for Inter-Area LSP65
Figure 7 ABR Protection Using Dynamic Bypass LSP66
Preference Option for Standby Secondary LSP Paths68
RSVP-TE Fast Reroute (FRR)69
FRR Terminology70
Table 6 FRR Terminology70
Bypass Resignal Timer72
FRR Behavior73
Dynamic and Manual Bypass Lsps74
Bypass LSP Selection Rules for the PLR74
Figure 8 Bypass Tunnel Node Example75
FRR Node Protection (Facility Backup)77
Admin Group Support on Facility Bypass Backup Lsps78
Figure 9 FRR Node-Protection Example78
FRR over Unnumbered Interfaces79
Shared Risk Link Groups80
Srlgs for Secondary LSP Paths80
Srlgs for FRR LSP Paths81
Disjoint and Non-Disjoint Paths81
Enabling Disjoint Backup Paths82
Figure 10 Disjoint Primary and Secondary Lsps83
Figure 11 Disjoint FRR Bypass Lsps84
RSVP-TE Graceful Shutdown85
RSVP-TE Support for Unnumbered Interfaces86
PCEP Support for RSVP-TE Lsps88
Segment Routing with Traffic Engineering (SR-TE)89
SR-TE Support90
SR-TE LSP Instantiation91
PCC-Initiated and PCC-Controlled Lsps93
Figure 12 Multi-Plane te with Node Protection97
PCC-Initiated and PCE-Computed/Controlled LSP98
SR-TE LSP Path Computation100
Service and Shortcut Application SR-TE Label Stack Check102
Table 7 Parameter Values for Frr-Overhead102
SR-TE LSP Paths Using Explicit Sids104
SR-TE LSP Protection105
Local Protection107
End-To-End Protection108
Seamless BFD for SR-TE Lsps108
Configuration of S-BFD on SR-TE Lsps109
Support for BFD Failure Action with SR-TE Lsps110
S-BFD Operational Considerations112
Static Route Resolution Using SR-TE Lsps112
BGP Label Route Resolution Using SR-TE Lsps113
Service Packet Forwarding Using SR-TE Lsps113
Data Path Support115
Figure 13 SR-TE LSP Label Stack Programming116
SR-TE LSP Metric and MTU Settings117
SR-TE Entropy Labels119
Weighted ECMP by RSVP-TE or SR-TE Lsps120
Weighted ECMP for VPRN Services with Auto-Bind121
Weighted ECMP for EVPN121
Weighted ECMP for Sdps122
MPLS Service Usage123
Service Destination Points123
MPLS and RSVP-TE Configuration Process Overview124
Figure 14 MPLS and RSVP-TE Configuration and Implementation Flow124
Configuration Notes125
Configuring MPLS and RSVP-TE with CLI127
MPLS Configuration Overview128
Router Interface128
E-LSP for Differentiated Services128
Paths128
Lsps129
Pseudowires129
Signaling Protocol130
Basic MPLS Configuration131
Common Configuration Tasks133
Configuring MPLS Components133
Configuring Global MPLS Parameters134
Configuring an MPLS Interface135
Configuring MPLS Paths136
Configuring an MPLS LSP137
Configuring a Static LSP137
Configuring a Fast-Retry Timer for Static Lsps138
Configuring Manual Bypass Tunnels138
Table 8 Disabled and Enabled Options for Bypass-Only139
Figure 15 Manual Bypass Tunnels139
Configuring RSVP-TE Parameters and Interfaces140
Configuring RSVP-TE Message Pacing Parameters141
MPLS Configuration Management Tasks142
Deleting MPLS142
Modifying MPLS Parameters142
Modifying an MPLS LSP143
Modifying MPLS Path Parameters143
Modifying MPLS Static LSP Parameters144
Deleting an MPLS Interface144
RSVP-TE Configuration Management Tasks146
Modifying RSVP-TE Parameters146
Modifying RSVP-TE Message Pacing Parameters147
Deleting an Interface from RSVP-TE147
Configuring and Operating SR-TE148
SR-TE Configuration Prerequisites148
SR-TE LSP Configuration Overview149
Configuring Path Computation and Control for SR-TE Lsps150
Configuring Path Profile and Group for PCC-Initiated and PCE-Computed/Controlled Lsps150
Configuring SR-TE LSP Label Stack Size151
Configuring Adjacency SID Parameters151
Configuring PCC-Controlled, PCE-Computed, and PCE-Controlled SR-TE Lsps152
MPLS and RSVP-TE Command Reference155
Command Hierarchies155
MPLS Commands156
RSVP-TE Commands159
Show Commands160
Clear Commands161
Monitor Commands161
Debug Commands162
Command Descriptions164
Configuration Commands (MPLS)165
Configuration Commands (RSVP-TE)217
Show Commands (MPLS)233
Table 9 Router MPLS Admin-Group Field Descriptions233
Table 10 Router MPLS Bypass-Tunnel Field Descriptions234
Table 11 Router MPLS Interface Field Descriptions236
Table 12 Router MPLS LSP Field Descriptions239
Table 13 MPLS LSP Detailed Field Descriptions240
Table 14 Router MPLS LSP Path Detail Field Descriptions244
Table 15 Router MPLS LSP Path MBB Field Descriptions248
Table 16 Router MPLS Auto LSP Field Descriptions249
Table 17 Router MPLS LSP Template Field Descriptions253
Table 18 Router MPLS Path Field Descriptions256
Table 19 Router MPLS SRLG Group Field Descriptions265
Table 20 Router MPLS Static LSP Field Descriptions267
Table 21 Router MPLS Status Field Descriptions269
Show Commands (MPLS-Labels)271
Table 22 Router MPLS-Labels Label Field Descriptions272
Table 23 Router MPLS-Labels Label Range Field Descriptions273
Table 24 Router MPLS-Labels Summary Field Descriptions273
Show Commands (Seamless BFD)275
Show Commands (RSVP)276
Table 25 Router RSVP-TE Interface Field Descriptions277
Table 26 Router RSVP-TE Interface Detail Field Descriptions278
Table 27 Router RSVP-TE Interface Statistics Field Descriptions280
Table 28 Router RSVP-TE Neighbor Field Descriptions282
Table 29 Router RSVP-TE Session Field Descriptions284
Table 30 Router RSVP-TE Statistics Field Descriptions284
Table 31 Router RSVP-TE Status Field Descriptions286
Clear Commands287
Monitor Commands289
Debug Commands296
Pcep305
Introduction to the Path Computation Element (PCE) Communication Protocol (PCEP)306
Figure 16 NSP Functional Modules307
Figure 17 NRC-P Architecture308
Base Implementation of Path Computation Elements (PCE)310
Table 32 Base PCEP Tlvs, Objects, and Messages310
PCEP Session Establishment and Maintenance313
Figure 18 PCEP Session Initialization313
PCEP Parameters315
PCC Configuration315
Stateful PCE316
Table 33 PCEP Stateful PCE Extension Tlvs, Objects, and Messages316
PCEP Extensions in Support of SR-TE Lsps318
LSP Initiation319
Table 34 PCEP Segment Routing Extension Objects and Tlvs319
PCC-Initiated and PCE-Computed or PCE-Controlled Lsps321
PCEP Support for RSVP-TE Lsps324
RSVP-TE LSP Configuration for a PCC Router324
Behavior of the LSP Path Update326
Path Update with Empty ERO327
Behavior of LSP MBB327
PCC-Controlled Lsps328
PCE-Computed Lsps328
PCE-Controlled Lsps329
Behavior of Secondary LSP Paths332
PCE Path Profile Support332
LSP Path Diversity and Bidirectionality Constraints334
Table 35 PCEP Path Profile Extension Objects and Tlvs335
NSP and VSR-NRC PCE Redundancy337
Feature Configuration337
NSP Ecosystem Redundancy337
Figure 19 NSP Ecosystem Redundancy338
NSP Cluster Redundancy339
VSR-NRC Redundancy339
PCC Behavior340
Configuring RSVP-TE Lsps with PCEP Using the CLI343
PCEP on the PCE Node and the PCC Node343
Figure 20 Multi-Level IS-IS Topology in the NSP GUI344
MPLS on the PCC Node346
Figure 21 Primary and Secondary RSVP-TE LSP Paths in the NSP GUI346
PCEP Configuration Command Reference351
Command Hierarchies351
PCEP Commands352
Show Commands352
Command Descriptions353
PCEP Commands354
Show Commands359
Table 36 PCEP PCC Field Descriptions359
Table 37 PCEP PCC Peer Field Descriptions362
Table 38 PCEP PCC Status Field Descriptions364
Label Distribution Protocol367
Label Distribution Protocol368
LDP and MPLS369
BFD for T-LDP370
LDP Architecture370
LDP Subsystem Interrelationships371
Memory Manager and LDP371
Label Manager371
LDP Configuration372
Figure 22 LDP Subsystem Interrelationships372
Logger373
Service Manager373
Execution Flow373
Initialization373
Session Lifetime373
Label Exchange375
Implicit Null Label375
Other Reasons for Label Actions375
Cleanup376
LDP Filters376
LDP FEC Statistics377
Multi-Area and Multi-Instance Extensions to LDP377
ECMP Support for LDP378
Label Operations381
Graceful Restart Helper382
Graceful Handling of Resource Exhaustion382
LDP Support for Unnumbered Interfaces383
LDP Fast Reroute (FRR)385
ECMP Vs FRR387
IGP Shortcuts (RSVP-TE Tunnels)387
LDP FRR Configuration387
LDP-To-Segment Routing Stitching for Ipv4 /32 Prefixes (IS-IS)388
Stitching in the LDP-To-SR Direction390
Figure 23 Stitching in the LDP-To-SR Direction390
Stitching in the SR-To-LDP Direction391
TTL Propagation and ICMP Tunneling393
LDP FRR Remote LFA and TI-LFA Backup Using an SR Tunnel for Ipv4 /32 Prefixes (IS-IS)393
Feature Behavior394
TCP MD5 Authentication394
LDP Point-To-Multipoint Support396
LDP Point-To-Multipoint Configuration396
LDP Point-To-Multipoint Protocol396
Make-Before-Break (MBB)397
ECMP Support397
Inter-AS Non-Segmented Mldp397
LDP Recursive FEC Process397
Figure 24 Mldp FEC for Single as with Transit Ipv4 Opaque398
Figure 25 Mldp FEC for Inter-AS with Recursive Opaque Value399
Figure 26 Non-VPN Mldp with Recursive Opaque for Inter-AS400
Figure 27 Asbrs Using EBGP Without IGP401
Oam402
Figure 28 ECHO Request Target FEC Stack TLV402
ECMP Support403
Figure 29 ECMP Support403
Intra-AS Non-Segmented Mldp404
ABR Mofrr for Intra-AS405
Interaction with an Inter-AS Non-Segmented Mldp Solution405
Figure 30 Intra-AS Non-Segmented Topology405
Multicast LDP Fast Upstream Switchover406
Mldp Fast Upstream Switchover Configuration406
Mldp Fast Upstream Switchover Behavior407
Figure 31 Multicast LDP Fast Upstream Switchover408
LDP Ipv6410
Figure 32 LDP Adjacency and Session over an Ipv6 Interface410
Link LDP411
Targeted LDP412
FEC Resolution412
LDP Session Capabilities413
LDP Adjacency Capabilities414
IP Address and FEC Distribution416
Figure 33 LDP Ipv6 Address and FEC Distribution Procedure418
IGP and Static Route Synchronization with LDP419
Figure 34 LDP Ipv6 Address and FEC Distribution Procedure419
BFD Operation420
Services Using SDP with an LDP Ipv6 FEC421
Mirror Services421
Configuration at Mirror Source Node422
Configuration at Mirror Destination Node422
OAM Support with LDP Ipv6423
Interoperability424
Interoperability with Implementations Compliant with Draft- Ietf-Mpls-Ldp-Ipv6424
Interoperability with Implementations Compliant with RFC 5036 for Ipv4 LDP Control Plane Only425
Upgrading from Ipv4 to Ipv6425
Figure 35 Smooth Management Transition from Ipv4 to Ipv6426
LDP Process Overview427
Figure 36 LDP Configuration and Implementation427
Configuration Notes428
Configuring LDP with CLI429
LDP Configuration Overview430
Basic LDP Configuration431
Common Configuration Tasks432
Enabling LDP432
Configuring Graceful Restart Helper Parameters433
Applying Import and Export Policies434
Configuring Interface Parameters435
Specifying Targeted Session Parameters436
Specifying Peer Parameters437
Configuring LDP Support for Multicast VPN (MVPN)438
Configuring LDP Support for LDP-To-SR Stitching439
Enabling LDP Signaling and Services439
LDP Configuration Management Tasks441
Disabling LDP441
Modifying Targeted Session Parameters441
Modifying Interface Parameters442
LDP Command Reference445
Command Hierarchies445
LDP Commands446
Show Commands448
Monitor Commands451
Clear Commands451
Debug Commands451
Command Descriptions453
Configuration Commands454
Show Commands482
Clear Commands538
Monitor Commands540
Debug Commands548
Supported Standards and Protocols579

Nokia 7705 SAR-W Series - PCEP

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