Browse Prior Art Database

Fault Tolerance for the Label Distribution Protocol (LDP) (RFC3479)

IP.com Disclosure Number: IPCOM000011407D
Original Publication Date: 2003-Feb-01
Included in the Prior Art Database: 2003-Feb-19

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

A. Farrel: AUTHOR [+2]

Abstract

Multiprotocol Label Switching (MPLS) systems will be used in core networks where system downtime must be kept to an absolute minimum. Many MPLS Label Switching Routers (LSRs) may, therefore, exploit Fault Tolerant (FT) hardware or software to provide high availability of the core networks.

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Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � A. Farrel, Ed.

Request for Comments: 3479� � � � � � � � � � � � � � � � � � � � � � � � � Movaz Networks, Inc.

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � February 2003

� � � � � � Fault Tolerance for the Label Distribution Protocol (LDP)

Status of this Memo

� � This document specifies an Internet standards track protocol for the

� � Internet community, and requests discussion and suggestions for

� � improvements.� Please refer to the current edition of the "Internet

� � Official Protocol Standards" (STD 1) for the standardization state

� � and status of this protocol.� Distribution of this memo is unlimited.

Copyright Notice

� � Copyright (C) The Internet Society (2003).� All Rights Reserved.

IESG Note

� � This specification includes procedures for failure detection and

� � failover for a TCP connection carrying MPLS LDP control traffic, so

� � that it can be switched to a new TCP connection.� It does not provide

� � a general approach to using multiple TCP connections to provide this

� � kind of fault tolerance.� The specification lacks adequate guidance

� � for the timer and retry value choices related to the TCP connection

� � fault tolerance procedures.� The specification should not serve as a

� � model for TCP connection fault tolerance design for any future

� � document, and users are advised to test configurations based on this

� � specification very carefully for problems such as premature

� � failovers.

Abstract

� � Multiprotocol Label Switching (MPLS) systems will be used in core

� � networks where system downtime must be kept to an absolute minimum.

� � Many MPLS Label Switching Routers (LSRs) may, therefore, exploit

� � Fault Tolerant (FT) hardware or software to provide high availability

� � of the core networks.

� � The details of how FT is achieved for the various components of an FT

� � LSR, including Label Distribution Protocol (LDP), the switching

� � hardware and TCP, are implementation specific.� This document

� � identifies issues in the LDP specification in RFC 3036, "LDP

� � Specification", that make it difficult to implement an FT LSR using

� � the current LDP protocols, and defines enhancements to the LDP

� � specification to ease such FT LSR implementations.

Farrel� � � � � � � � � � � � � � � � � � � � � Standards Track� � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3479� � � � � � � � � � � � � Fault Tolerance for the LDP� � � � � � � � � February 2003

� � The issues and extensions described here are equally applicable to

� � RFC 3212, "Constraint-Based LSP Setup Using LDP" (CR-LDP).

Table of Contents

� � 1. Conventions and Terminology used in this document..........3

� � 2. Contributing Authors.......................................4

� � 3. Introduction...............................................4

� � � � � 3.1. Fault Tolerance for MPLS..............................4...