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Support for Multicast over UNI 3.0/3.1 based ATM Networks (RFC2022)

IP.com Disclosure Number: IPCOM000002576D
Original Publication Date: 1996-Nov-01
Included in the Prior Art Database: 2000-Sep-13

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

G. Armitage: AUTHOR

Abstract

Mapping the connectionless IP multicast service over the connection oriented ATM services provided by UNI 3.0/3.1 is a non-trivial task. This memo describes a mechanism to support the multicast needs of Layer 3 protocols in general, and describes its application to IP multicasting in particular.

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Network Working Group G. Armitage

Request for Comments: 2022 Bellcore

Category: Standards Track November 1996

Support for Multicast over UNI 3.0/3.1 based ATM Networks.

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

Abstract

Mapping the connectionless IP multicast service over the connection

oriented ATM services provided by UNI 3.0/3.1 is a non-trivial task.

This memo describes a mechanism to support the multicast needs of

Layer 3 protocols in general, and describes its application to IP

multicasting in particular.

ATM based IP hosts and routers use a Multicast Address Resolution

Server (MARS) to support RFC 1112 style Level 2 IP multicast over the

ATM Forum's UNI 3.0/3.1 point to multipoint connection service.

Clusters of endpoints share a MARS and use it to track and

disseminate information identifying the nodes listed as receivers for

given multicast groups. This allows endpoints to establish and manage

point to multipoint VCs when transmitting to the group.

The MARS behaviour allows Layer 3 multicasting to be supported using

either meshes of VCs or ATM level multicast servers. This choice may

be made on a per-group basis, and is transparent to the endpoints.

Table of Contents

1. Introduction................................................. 4

1.1 The Multicast Address Resolution Server (MARS)............. 5

1.2 The ATM level multicast Cluster............................ 5

1.3 Document overview.......................................... 6

1.4 Conventions................................................ 7

2. The IP multicast service model............................... 7

3. UNI 3.0/3.1 support for intra-cluster multicasting........... 8

3.1 VC meshes.................................................. 9

3.2 Multicast Servers.......................................... 9

3.3 Tradeoffs.................................................. 10

3.4 Interaction with local UNI 3.0/3.1 signalling entity....... 11

4. Overview of the MARS......................................... 12

4.1 Architecture............................................... 12

4.2 Control message format..................................... 12

4.3 Fixed header...