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MPLS using LDP and ATM VC Switching (RFC3035)

IP.com Disclosure Number: IPCOM000005227D
Original Publication Date: 2001-Jan-01
Included in the Prior Art Database: 2001-Aug-17
Document File: 21 page(s) / 46K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Davie: AUTHOR [+7]

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).

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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...