IP Broadcast over ATM Networks (RFC2226)
Original Publication Date: 1997-Oct-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
T. Smith: AUTHOR [+2]
This memo describes how the IP multicast service being developed by the IP over ATM working group may be used to support IP broadcast transmission. The solution revolves around treating the broadcast problem as a special case of multicast, where every host in the subnet or cluster is a member of the group.
Network Working Group T. Smith
Request for Comments: 2226 IBM Corporation
Category: Standards Track G. Armitage
IP Broadcast over 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.
Copyright (C) The Internet Society (1997). All Rights Reserved.
This memo describes how the IP multicast service being developed by
the IP over ATM working group may be used to support IP broadcast
transmission. The solution revolves around treating the broadcast
problem as a special case of multicast, where every host in the
subnet or cluster is a member of the group.
An understanding of the services provided by RFC 2022 is assumed.
The IETF's first step in solving the problems of running IP over
Asynchronous Transfer Mode (ATM) technology is described in RFC 1577
. It provides for unicast communication between hosts and routers
within Logical IP Subnets (LISs), and proposes a centralized ATM ARP
Server which provides IP to ATM address resolution services to LIS
Two classes of IP service were omitted - multicast and broadcast
transmissions. Multicasting allows a single transmit operation to
cause a packet to be received by multiple remote destinations.
Broadcasting typically allows a single transmit operation to cause a
packet to be received by all IP hosts that are members of a
To address the need for multicast support (represented by
transmission to IP addresses in the Class D space), RFC 2022
("Support for Multicast over UNI 3.0/3.1 based ATM Networks")  was
created. This memo creates an analog of the RFC 1577 ARP Server - a
new entity known as the MARS (Multicast Address Resolution Server).
The MARS operates as a centralized registry and distribution
mechanism for mappings between IP multicast addresses and groups of
ATM unicast addresses. Host behavior is also defined for establishing
and managing point to multipoint VCs, based on the information
returned by the MARS, when hosts wish to transmit packets to a
This memo aims to show how RFC 2022 may be used to emulate IP
broadcast within Logical IP Subnets. While the broadcast technique
does not align itself well with the underlying point-to-point nature
of ATM, clearly, some applications will still wish to use IP
broadcasts. Client-server applications where the c...