RFC 3038 (rfc3038) - Page 1 of 19

VCID Notification over ATM link for LDP

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Network Working Group                                          K. Nagami
Request for Comments: 3038                                    Y. Katsube
Category: Standards Track                                  Toshiba Corp.
                                                               N. Demizu
                                                        WaterSprings.ORG
                                                                H. Esaki
                                                          Univ. of Tokyo
                                                               P. Doolan
                                                       Ennovate Networks
                                                            January 2001

                VCID Notification over ATM link for 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 (2001).  All Rights Reserved.

Abstract

   The Asynchronous Transfer Mode Label Switching Router (ATM-LSR) is
   one of the major applications of label switching.  Because the ATM
   layer labels (VPI and VCI) associated with a VC rewritten with new
   value at every ATM switch nodes, it is not possible to use them to
   identify a VC in label mapping messages.  The concept of Virtual
   Connection Identifier (VCID) is introduced to solve this problem.
   VCID has the same value at both ends of a VC.  This document
   specifies the procedures for the communication of VCID values between
   neighboring ATM-LSRs that must occur in order to ensure this
   property.

1. Introduction

   Several label switching schemes have been proposed to integrate Layer
   2 and Layer 3.  The ATM Label Switching Router (ATM-LSR) is one of
   the major applications of label switching.

   In the case of ATM VCs, the VPI and VCI labels are, in the general
   case, rewritten with new values at every switch node through which
   the VC passes and cannot be used to provide end to end identification
   of a VC.



Nagami, et al.              Standards Track
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