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Graceful Restart Mechanism for Label Distribution Protocol (RFC3478)

IP.com Disclosure Number: IPCOM000011406D
Original Publication Date: 2003-Feb-01
Included in the Prior Art Database: 2003-Feb-19
Document File: 13 page(s) / 29K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

M. Leelanivas: AUTHOR [+3]

Abstract

This document describes a mechanism that helps to minimize the negative effects on MPLS traffic caused by Label Switching Router's (LSR's) control plane restart, specifically by the restart of its Label Distribution Protocol (LDP) component, on LSRs that are capable of preserving the MPLS forwarding component across the restart.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 10% of the total text.

Network Working Group                                      M. Leelanivas

Request for Comments: 3478                                    Y. Rekhter

Category: Standards Track                               Juniper Networks

                                                             R. Aggarwal

                                                        Redback Networks

                                                           February 2003

       Graceful Restart Mechanism for Label Distribution Protocol

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.

Abstract

   This document describes a mechanism that helps to minimize the

   negative effects on MPLS traffic caused by Label Switching Router's

   (LSR's) control plane restart, specifically by the restart of its

   Label Distribution Protocol (LDP) component, on LSRs that are capable

   of preserving the MPLS forwarding component across the restart.

   The mechanism described in this document is applicable to all LSRs,

   both those with the ability to preserve forwarding state during LDP

   restart and those without (although the latter needs to implement

   only a subset of the mechanism described in this document).

   Supporting (a subset of) the mechanism described here by the LSRs

   that can not preserve their MPLS forwarding state across the restart

   would not reduce the negative impact on MPLS traffic caused by their

   control plane restart, but it would minimize the impact if their

   neighbor(s) are capable of preserving the forwarding state across the

   restart of their control plane and implement the mechanism described

   here.

   The mechanism makes minimalistic assumptions on what has to be

   preserved across restart - the mechanism assumes that only the actual

   MPLS forwarding state has to be preserved; the mechanism does not

   require any of the LDP-related states to be preserved across the

   restart.

Leelanivas, et al.          Standards Track                     [Page 1]

RFC 3478           Graceful Restart Mechanism for LDP      February 2003

   The procedures described in this document apply to downstream

   unsolicited label distribution.  Extending these procedures to

   downstream on demand label distribution is for further stu...