RFC 3038 (rfc3038) - Page 1 of 19
VCID Notification over ATM link for LDP
Alternative Format: Original Text Document
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