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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.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 2% of the total text.

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...