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LSP Modification Using CR-LDP (RFC3214)

IP.com Disclosure Number: IPCOM000006863D
Original Publication Date: 2002-Jan-01
Included in the Prior Art Database: 2002-Feb-07
Document File: 12 page(s) / 25K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

J. Ash: AUTHOR [+7]

Abstract

This document presents an approach to modify the bandwidth and possibly other parameters of an established CR-LSP (Constraint-based Routed Label Switched Paths) using CR-LDP (Constraint-based Routed Label Distribution Protocol) without service interruption. After a CR-LSP is set up, its bandwidth reservation may need to be changed by the network operator, due to the new requirements for the traffic carried on that CR-LSP. The LSP modification feature can be supported by CR-LDP by use of the _modify_value for the _action indicator flag_ in the LSPID TLV. This feature has application in dynamic network resources management where traffic of different priorities and service classes is involved.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 13% of the total text.

Network Working Group                                             J. Ash

Request for Comments: 3214                                          AT&T

Category: Standards Track                                         Y. Lee

                                                        Ceterus Networks

                                                        P. Ashwood-Smith

                                                             B. Jamoussi

                                                                D. Fedyk

                                                             D. Skalecki

                                                         Nortel Networks

                                                                   L. Li

                                                            SS8 Networks

                                                            January 2002

                     LSP Modification Using CR-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 (2002).  All Rights Reserved.

Abstract

   This document presents an approach to modify the bandwidth and

   possibly other parameters of an established CR-LSP (Constraint-based

   Routed Label Switched Paths) using CR-LDP (Constraint-based Routed

   Label Distribution Protocol) without service interruption.  After a

   CR-LSP is set up, its bandwidth reservation may need to be changed by

   the network operator, due to the new requirements for the traffic

   carried on that CR-LSP.  The LSP modification feature can be

   supported by CR-LDP by use of the _modify_value for the _action

   indicator flag_ in the LSPID TLV.  This feature has application in

   dynamic network resources management where traffic of different

   priorities and service classes is involved.

Ash, et al.                 Standards Track                     [Page 1]

RFC 3214             LSP Modification Using CR-LDP          January 2002

Table of Contents

   1.  Conventions Used in This Document ............................  2

   2.  Introduction .................................................  2

   3.  LSP Modification Using CR-LDP ................................  3

     3.1 Basic Procedure for Resource Modification ..................  3

     3.2 Rerouting LSPs .............................................  5

     3.3 Priority Handling ..........................................  6

     3.4 Modification Failure Case Handling .........................  6

   4.  Application of LSP Bandwidth Modification in Dynamic Resource

       Management ...................................................  7

   5.  Acknowledgments ..............................................  8

   6.  Intellectual Property Considerations .........................  8

   7.  Security Considerations ......................................  8

   8.  References ...................................................  8

   9.  Authors' Addresses ...........................................  9

   10. Full Copyright Statement ..................................... 11

1. Conventions Used in This Document

   L:           LSP (Label Switched Path)

   L-id:        LSPID (LSP Identifier)

   T:           Traffic Parameters

   R:           LSR (Label Switching Router)

   FEC:         Forwarding Equivalence Class

   NHLFE:       Next Hop Label Forwarding Entry

   FTN:         FEC To NHLFE

   TLV:         Type Length Value

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

   "SHOULD", "SHOULD NOT", "RECOMMENDED",  "MAY", and "OPTIONAL" in this

   document are to be interpreted as described in RFC 2119 [4].

2. Introduction

   Consider an LSP...