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MPLS using LDP and ATM VC Switching
RFC 3035

Document type: RFC - Proposed Standard (January 2001; No errata)
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: WG Document
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IESG State: RFC 3035 (Proposed Standard)
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Network Working Group                                           B. Davie
Request for Comments: 3035                                   J. Lawrence
Category: Standards Track                                  K. McCloghrie
                                                                E. Rosen
                                                              G. Swallow
                                                     Cisco Systems, Inc.
                                                              Y. Rekhter
                                                        Juniper Networks
                                                               P. Doolan
                                                 Ennovate Networks, Inc.
                                                            January 2001

                  MPLS using LDP and ATM VC Switching

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 Multiprotocol Label Switching (MPLS) Architecture [1] discusses a
   way in which Asynchronous Transfer Mode (ATM) switches may be used as
   Label Switching Routers.  The ATM switches run network layer routing
   algorithms (such as Open Shortest Path First (OSPF), Intermediate
   System to Intermediate System (IS-IS), etc.), and their data
   forwarding is based on the results of these routing algorithms.  No
   ATM-specific routing or addressing is needed.  ATM switches used in
   this way are known as ATM-LSRs (Label Switching Routers).

   This document extends and clarifies the relevant portions of [1] and
   [2] by specifying in more detail the procedures which to be used when
   distributing labels to or from ATM-LSRs, when those labels represent
   Forwarding Equivalence Classes (FECs, see [1]) for which the routes
   are determined on a hop-by-hop basis by network layer routing
   algorithms.

   This document also specifies the MPLS encapsulation to be used when
   sending labeled packets to or from ATM-LSRs, and in that respect is a
   companion document to [3].

Davie                       Standards Track                     [Page 1]
RFC 3035          MPLS using LDP and ATM VC Switching       January 2001

Table of Contents

    1      Introduction  ...........................................   2
    2      Specification of Requirements  ..........................   3
    3      Definitions  ............................................   3
    4      Special Characteristics of ATM Switches  ................   4
    5      Label Switching Control Component for ATM  ..............   5
    6      Hybrid Switches (Ships in the Night)  ...................   5
    7      Use of  VPI/VCIs  .......................................   5
    7.1    Direct Connections  .....................................   6
    7.2    Connections via an ATM VP  ..............................   7
    7.3    Connections via an ATM SVC  .............................   7
    8      Label Distribution and Maintenance Procedures  ..........   7
    8.1    Edge LSR Behavior  ......................................   8
    8.2    Conventional ATM Switches (non-VC-merge)  ...............   9
    8.3    VC-merge-capable ATM Switches  ..........................  11
    9      Encapsulation  ..........................................  12
   10      TTL Manipulation  .......................................  13
   11      Optional Loop Detection: Distributing Path Vectors  .....  15
   11.1    When to Send Path Vectors Downstream  ...................  15
   11.2    When to Send Path Vectors Upstream  .....................  16
   12      Security Considerations  ................................  17
   13      Intellectual Property Considerations  ...................  17
   14      References  .............................................  18
   15      Acknowledgments  ........................................  18
   16      Authors' Addresses  .....................................  18
   17      Full Copyright Statement  ...............................  20

1. Introduction

   The MPLS Architecture [1] discusses the way in which ATM switches may
   be used as Label Switching Routers.  The ATM switches run network
   layer routing algorithms (such as OSPF, IS-IS, etc.), and their data
   forwarding is based on the results of these routing algorithms. No
   ATM-specific routing or addressing is needed.  ATM switches used in
   this way are known as ATM-LSRs.

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