Alcatel-Lucent 7210 SAS E OS User manual

Alcatel-Lucent

Service Access Switch | Release 8.0 Rev. 01

7210 SAS M, T, X, R6, Mxp OS

MPLS Guide

3HE10394AAAATQZZA

Alcatel-Lucent – Proprietary & Confidential

Contains proprietary/trade secret information which is the property of Alcatel-Lucent. Not to be made available

to, or copied or used by anyone who is not an employee of Alcatel-Lucent except when there is a valid nondisclosure

agreement in place which covers such information and contains appropriate non-disclosure and

limited use obligations.

without notice. The information contained herein is believed to be accurate as of the date of publication. AlcatelLucent

All specifications, procedures, and information in this document are subject to change and revision at any

time without notice. The information contained herein is believed to be accurate as of the date of

publication. Alcatel-Lucent provides no warranty, express or implied, regarding its contents. Users are fully

responsible for application or use of the documentation.

Alcatel, Lucent, Alcatel-Lucent and the Alcatel-Lucent logo are trademarks of Alcatel-Lucent. All other

trademarks are the property of their respective owners.

Disclaimers

Alcatel-Lucent products are intended for commercial uses. Without the appropriate network design

engineering, they must not be sold, licensed or otherwise distributed for use in any hazardous environments

requiring fail-safe performance, such as in the operation of nuclear facilities, aircraft navigation or

communication systems, air traffic control, direct life-support machines, or weapons systems, in which the

failure of products could lead directly to death, personal injury, or severe physical or environmental

damage. The customer hereby agrees that the use, sale, license or other distribution of the products for any

such application without the prior written consent of Alcatel-Lucent, shall be at the customer's sole risk.

The customer hereby agrees to defend and hold Alcatel-Lucent harmless from any claims for loss, cost,

damage, expense or liability that may arise out of or in connection with the use, sale, license or other

distribution of the products in such applications.

This document may contain information regarding the use and installation of non-Alcatel-Lucent products.

Please note that this information is provided as a courtesy to assist you. While Alcatel-Lucent tries to ensure

that this information accurately reflects information provided by the supplier, please refer to the materials

provided with any non-Alcatel-Lucent product and contact the supplier for confirmation. Alcatel-Lucent

assumes no responsibility or liability for incorrect or incomplete information provided about non-Alcatel-

Lucent products.

However, this does not constitute a representation or warranty. The warranties provided for Alcatel-Lucent

products, if any, are set forth in contractual documentation entered into by Alcatel-Lucent and its

customers.

This document was originally written in English. If there is any conflict or inconsistency between the

English version and any other version of a document, the English version shall prevail.

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Preface

Alcatel-Lucent 7210 SAS-M, X, T, R6, Mxp Router Configuration Process . . . . . . . . . . . . . . . . . . . . . . . .15

MPLS and RSVP

MPLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

MPLS Label Stack. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Label Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Label Switching Routers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

LSP Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

MPLS Fast Re-Route (FRR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Manual Bypass LSP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

PLR Bypass LSP Selection Rules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

FRR Node-Protection (Facility) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Uniform FRR Failover Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Configuration Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

MPLS Transport Profile (MPLS-TP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

MPLS-TP Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

MPLS-TP Provider Edge and Gateway. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

VLL Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Detailed Descriptions of MPLS-TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

MPLS-TP LSPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

MPLS-TP on Pseudowires . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33

MPLS-TP Maintenance Identifiers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Generic Associated Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

MPLS-TP Operations, Administration and Maintenance (OAM) . . . . . . . . . . . . . . . . . . . . . . . . . . .38

On-Demand Connectivity Verification (CV) using LSP-Ping . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Proactive CC, CV and RDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

BFD-based RDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

PW Control Channel Status Notifications (Static Pseudowire Status Signaling) . . . . . . . . . . . . . . .42

Pseudowire Redundancy and Active / Standby Dual Homing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

MPLS-TP LSP Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .44

Configuring MPLS-TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Configuration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Node-Wide MPLS-TP Parameter Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Node-Wide MPLS-TP Identifier Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49

Static LSP and pseudowire (VC) Label and Tunnel Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Interface Configuration for MPLS-TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

LER Configuration for MPLS-TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

LSP and Path Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Proactive CC/CV (using BFD) Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Protection templates and Linear Protection Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Intermediate LSR Configuration for MPLS-TP LSPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58

RSVP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

Using RSVP for MPLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

RSVP Traffic Engineering Extensions for MPLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

Hello Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62

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MD5 Authentication of RSVP Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .63

Reservation Styles. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

RSVP Message Pacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

RSVP Overhead Refresh Reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65

Configuring Implicit Null . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66

Traffic Engineering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

TE Metric (IS-IS and OSPF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Maintenance of TE links and Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68

Advanced MPLS/RSVP Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Shared Risk Link Groups. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Enabling Disjoint Backup Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Static Configurations of SRLG Memberships. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

TE Graceful Shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .74

MPLS Service Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

MPLS/RSVP Configuration Process Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

Configuration Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

Configuring MPLS and RSVP with CLI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

MPLS Configuration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

LSPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Router Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

Choosing the Signaling Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81

Basic MPLS Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

Common Configuration Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

Configuring MPLS Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Configuring Global MPLS Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Configuring an MPLS Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .85

Configuring MPLS Paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Configuring an MPLS LSP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Configuring a Static LSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Configuring Manual Bypass Tunnels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

Configuring RSVP Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91

Configuring RSVP Message Pacing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

Configuring Graceful Shutdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

MPLS Configuration Management Tasks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

Modifying MPLS Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

Modifying an MPLS LSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95

Modifying MPLS Path Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

Modifying MPLS Static LSP Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

Deleting an MPLS Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

RSVP Configuration Management Tasks. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99

Modifying RSVP Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99

Modifying RSVP Message Pacing Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100

Deleting an Interface from RSVP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100

MPLS/RSVP Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

Command Hierarchies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

MPLS Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

MPLS-TP Commands (Supported on 7210 SAS-R6 and 7210 SAS-T network mode devices) . .103

MPLS LSP Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104

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MPLS-TP LSP Commands (Supported on 7210 SAS-R6 and 7210 SAS-T). . . . . . . . . . . . . . . . .106

MPLS Path Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106

RSVP Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107

Show Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

Tools Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

Clear Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

Debug Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110

Label Distribution Protocol

Label Distribution Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220

LDP and MPLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .220

LDP Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .221

Subsystem Interrelationships . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222

Memory Manager and LDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

Label Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

LDP Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

Logger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

Service Manager . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .223

Execution Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224

Initialization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224

Session Lifetime. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224

Session Establishment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .224

Label Exchange. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225

Other Reasons for Label Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225

Cleanup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .225

LDP Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .226

ECMP Support for LDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227

Label Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .227

Link LDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .228

Targeted LDP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .228

LDP over RSVP Tunnels. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .233

Signaling and Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .236

Rerouting Around Failures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .238

Configuring Implicit Null Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .239

T-LDP Session Tracking Using BFD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .239

Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .240

LDP Downstream-on-Demand (DoD). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .241

Single-Hop LDP DoD Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .241

LDP over RSVP and ECMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .242

LDP Fast-Reroute for IS-IS and OSPF Prefixes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .242

LDP FRR Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .243

Reducing the Scope of the LFA Calculation by SPF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .243

LDP FRR Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .244

Link LDP Hello Adjacency Tracking with BFD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .245

ECMP Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .246

IS-IS and OSPF Support for Loop-Free Alternate Calculation. . . . . . . . . . . . . . . . . . . . . . . . . . . .247

Multi-Area and Multi-Instance Extensions to LDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .250

LDP Process Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .251

Configuring LDP with CLI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .253

LDP Configuration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .254

Page 6 7210 SAS M, T, X, R6, Mxp MPLS Configuration Guide

Table of Contents

Basic LDP Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .255

Common Configuration Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .256

Enabling LDP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .256

Configuring Graceful-Restart Helper Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .257

Applying Export and Import Policies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .258

Targeted Session Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .260

Interface Parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .262

Peer Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .263

LDP Signaling and Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .264

LDP Configuration Management Tasks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .265

Disabling LDP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .265

Modifying Targeted Session Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .266

Modifying Interface Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .267

LDP Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .269

Command Hierarchies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .269

LDP Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .269

Show Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .270

Clear Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .271

Debug Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .271

Standards and Protocol Support

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .315

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .321

7210 SAS M, T, X, R6, Mxp MPLS Configuration Guide Page 7

L

IST

OF

T

ABLES

Preface

Table 1: Configuration Process. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

MPLS and RSVP

Table 2: Packet/Label Field Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Table 3: Mapping from RSVP-TE to MPLS-TP Maintenance Identifiers. . . . . . . . . . . . . . . . . . . . . . . . . .36

Table 4: Address types for the downstream mapping TLV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Label Distribution Protocol

Table 5: Triggering Events and the Associated Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .230

Page 8 7210 SAS M, T, X, R6, Mxp MPLS Configura-

List of Tables

7210 SAS M, T, X, R6, Mxp MPLS Configuration Guide Page 9

L

IST

OF

F

IGURES

MPLS and RSVP

Figure 1: Label Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Figure 2: Label Packet Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Figure 3: Bypass Tunnel Nodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Figure 4: FRR Node-Protection Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Figure 5: MPLS-TP Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30

Figure 6: MPLS-TP Provider Edge and Gateway, VLL Services. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Figure 7: MPLS-TP Provider Edge and Gateway, spoke-SDP Termination on VPLS . . . . . . . . . . . . . . .32

Figure 8: MPLS-TP LSR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Figure 9: MPLS-TP Maintenance Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Figure 10: MPLS-TP LSP and Tunnel Information Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Figure 11: MPLS-TP PW Information Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Figure 12: Example usage of PW Identifiers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Figure 13: Label for LSP and PW G-ACh Packets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38

Figure 14: BFD used for proactive CC on MPLS-TP LSP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Figure 15: BFD used for proactive CV on MPLS-TP LSP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

Figure 16: Normal Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45

Figure 17: Failed Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Figure 18: Failed Condition - Switching at A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Figure 19: Failed Condition - Switching at Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Figure 20: Establishing LSPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

Figure 21: LSP Using RSVP Path Set Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .61

Figure 22: Shared Risk Link Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

Figure 23: MPLS and RSVP Configuration and Implementation Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

Label Distribution Protocol

Figure 24: Subsystem Interrelationships. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .222

Figure 25: LDP over RSVP Application. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .233

Figure 26: LDP over RSVP Application Variant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .235

Figure 27: Topology with Primary and LFA Routes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .247

Figure 28: Example Topology with Broadcast Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .248

Figure 29: LDP Configuration and Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .252

Page 10 7210 SAS M, T, X, R6, Mxp MPLS Configura-

List of Figures

7210 SAS M, T, X, R6, Mxp MPLS Configuration Guide Page 11

Preface

About This Guide

This guide describes the services and protocol support provided by the 7210 SAS Series and

presents examples to configure and implement MPLS, RSVP, and LDP protocols.

This document 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.

Audience

This manual is intended for network administrators who are responsible for configuring the 7210

SAS Series routers that support Network Mode operation. It is assumed that the network

administrators have an understanding of networking principles and configurations. Protocols and

concepts described in this manual include the following:

• Multiprotocol Label Switching (MPLS)

• Resource Reservation Protocol (RSVP)

• Label Distribution Protocol (LDP)

Preface

Page 12 7210 SAS M, T, X, R6, Mxp MPLS Configu-

ration Guide

List of Technical Publications

The 7210 SAS-M, T, X, R6, Mxp documentation set is composed of the following books:

• 7210 SAS-M, T, X, R6, Mxp Basic System Configuration Guide

This guide describes basic system configurations and operations.

• 7210 SAS-M, T, X, R6, Mxp System Management Guide

This guide describes system security and access configurations as well as event

logging and accounting logs.

• 7210 SAS-M, T, X, R6, Mxp Interface Configuration Guide

Tis guide describes card, Media Dependent Adapter (MDA), and port provisioning.

• 7210 SAS-M, T, X, R6, Mxp OS Router Configuration Guide

This guide describes logical IP routing interfaces and associated attributes such as an

IP address, port, link aggregation group (LAG) as well as IP and MAC-based filtering.

• 7210 SAS-M, X, T, R6, Mxp OS MPLS Guide

This guide describes how to configure Multiprotocol Label Switching (MPLS),

Resource Reservation Protocol (RSVP), and Label Distribution Protocol (LDP).

• 7210 SAS-M, T, Mxp OS, and 7210 SAS-X, R6 OS Services Guide

This guide describes how to configure service parameters such as customer

information and user services.

• 7210 SAS-M, T, X, R6, Mxp OAM and Diagnostic Guide

This guide describes how to configure features such as service mirroring and

Operations, Administration and Management (OAM) tools.

• 7210 SAS-M, T, Mxp OS and 7210 SAS-X, R6 OS Quality of Service Guide

This guide describes how to configure Quality of Service (QoS) policy management.

Preface

7210 SAS M, T, X, R6, Mxp MPLS Configuration Guide Page 13

Technical Support

If you purchased a service agreement for your 7210 SAS series 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 an Alcatel-Lucent service agreement, contact your welcome

center:

Web: http://www.alcatel-lucent.com/portal/support.html

Preface

Page 14 7210 SAS M, T, X, R6, Mxp MPLS Configu-

ration Guide

7210 SAS M, T, X, R6, Mxp MPLS Configuration Guide Page 15

G

ETTING

S

TARTED

In This Chapter

This chapter provides process flow information to configure MPLS, RSVP, and LDP protocols.

Alcatel-Lucent 7210 SAS-M, X, T, R6, Mxp Router Configu-

ration Process

Table 1 lists the tasks necessary to configure MPLS applications functions.

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 Chapter

Protocol configuration Configure MPLS protocols:

• MPLS MPLS on page 18

• RSVP RSVP on page 60

• LDP Label Distribution Protocol on page 219

Reference List of IEEE, IETF, and other

proprietary entities.

Standards and Protocol Support on page 315

Getting Started

Page 16 7210 SAS M, T, X, R6, Mxp MPLS Configura-

tion Guide

7210 SAS M, T, X, R6, Mxp MPLS Configuration Guide Page 17

MPLS and RSVP

In This Chapter

This chapter provides information to configure MPLS and RSVP.

• MPLS on page 18

→ MPLS Label Stack on page 19

→ Label Switching Routers on page 22

• RSVP on page 60

→ Using RSVP for MPLS on page 62

→ Reservation Styles on page 64

• Traffic Engineering on page 67

• Advanced MPLS/RSVP Features on page 69

→ Shared Risk Link Groups on page 70

→ TE Graceful Shutdown on page 74

• MPLS Service Usage on page 75

• MPLS/RSVP Configuration Process Overview on page 76

• Configuration Notes on page 77

MPLS

Page 18 7210 SAS M, T, X, R6, Mxp MPLS Configura-

tion Guide

MPLS

Multiprotocol Label Switching (MPLS) is a label switching technology that provides the ability to

set up connection-oriented paths over a connection less IP network. MPLS facilitates network

traffic flow and provides a mechanism to engineer network traffic patterns independently from

routing tables. MPLS sets up a specific path for a sequence of packets. The packets are identified

by a label inserted into each packet. MPLS is not enabled by default and must be explicitly

enabled.

MPLS is independent of any routing protocol but is considered multiprotocol because it works

with the Internet Protocol (IP) and frame relay network protocols.

MPLS and RSVP

7210 SAS M, T, X, R6, Mxp MPLS Configuration Guide Page 19

MPLS Label Stack

MPLS requires a set of procedures to enhance network layer packets with label stacks which

thereby turns them into labeled packets. Routers that support MPLS are known as Label Switching

Routers (LSRs). In order to transmit a labeled packet on a particular data link, an LSR must

support the encoding technique which, when given a label stack and a network layer packet,

produces a labeled packet.

In MPLS, packets can carry not just one label, but a set of labels in a stack. An LSR can swap the

label at the top of the stack, pop the stack, or swap the label and push one or more labels into the

stack. The processing of a labeled packet is completely independent of the level of hierarchy. The

processing is always based on the top label, without regard for the possibility that some number of

other labels may have been above it in the past, or that some number of other labels may be below

it at present.

As described in RFC 3032, MPLS Label Stack Encoding, the label stack is represented as a

sequence of label stack entries. Each label stack entry is represented by 4 octets. Figure 1 displays

the label placement in a packet.

Figure 1: Label Placement

Table 2: Packet/Label Field Description

Field Description

Label This 20-bit field carries the actual value (unstructured) of the label.

Exp This 3-bit field is reserved for experimental use. It is currently used for Class of

Service (CoS).

S This bit is set to 1 for the last entry (bottom) in the label stack, and 0 for all

other label stack entries.

TTL This 8-bit field is used to encode a TTL value.

MPLS

Page 20 7210 SAS M, T, X, R6, Mxp MPLS Configura-

tion Guide

A stack can carry several labels, organized in a last in/first out order. The top of the label stack

appears first in the packet and the bottom of the stack appears last (Figure 2).

Figure 2: Label Packet Placement

The label value at the top of the stack is looked up when a labeled packet is received. A successful

lookup reveals:

• The next hop where the packet is to be forwarded.

• The operation to be performed on the label stack before forwarding.

In addition, the lookup may reveal outgoing data link encapsulation and other information needed

to properly forward the packet.

An empty label stack can be thought of as an unlabeled packet. An empty label stack has zero (0)

depth. The label at the bottom of the stack is referred to as the Level 1 label. The label above it (if

it exists) is the Level 2 label, and so on. The label at the top of the stack is referred to as the Level

m label.

Labeled packet processing is independent of the level of hierarchy. Processing is always based on

the top label in the stack which includes information about the operations to perform on the

packet's label stack.

OSSG014

Layer 2 Header Top Label … Bottom Label Data Packet

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