IPng Support for ATM Services
RFC 1680

Document Type RFC - Informational (August 1994; No errata)
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Network Working Group                                     C. Brazdziunas
Request for Comments: 1680                                      Bellcore
Category: Informational                                      August 1994

                     IPng Support for ATM Services

Status of this Memo

   This memo provides information for the Internet community.  This memo
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.


   This document was submitted to the IETF IPng area in response to RFC
   1550.  Publication of this document does not imply acceptance by the
   IPng area of any ideas expressed within.  Comments should be
   submitted to the big-internet@munnari.oz.au mailing list.

Executive Summary

   This white paper describes engineering considerations for IPng as
   solicited by RFC 1550 [1].  IPng should provide support for existing
   and emerging link technologies that it will be transported over. Link
   technologies like Ethernet simply multiplex traffic from upper layer
   protocols onto a single channel. "Sophisticated" link technologies
   like ATM are emerging in the marketplace allowing several virtual
   channels to be established over a single wire (or fiber) potentially
   based on an applications' network performance objectives.

   Support for both "sophisticated" (ATM) and existing link technologies
   needs to be considered in an IPng candidate. End-to-end applications
   will communicate through a network where IPng packets travel across
   subnetworks such as Ethernet and Hippi and also more "sophisticated"
   link levels such as ATM.  Though initial support for IPng over ATM
   subnetworks will not facilitate a virtual circuit per application,
   the hooks to provide such a mapping should be in place while also
   maintaining support for the transport of IPng packets across
   conventional subnetworks. Application support for QOS-based link
   level service requires that the  following types of ATM information
   be mappable (or derivable) from the higher level protocol(s) such as
   IPng: source and destination(s) addresses, connection quality of
   service parameters, connection state, and ATM virtual circuit
   identifier. Some of these mappings may be derivable from information
   provided by proposed resource reservation protocols supporting an
   integrated services Internet [4]. However, the ATM virtual circuit
   identifier should be efficiently derivable from IPng packet

Brazdziunas                                                     [Page 1]
RFC 1680             IPng Support for ATM Services           August 1994


   An IPng candidate should provide evidence that the mapping from an
   applications' IPng packets to ATM virtual circuit(s) can be
   accomplished in a heterogeneous Internet architecture keeping in
   consideration the gigabit/sec rates that IPng/ATM subnetworks will
   eventually be operating at.

1.  Introduction

   This paper describes parameters that are needed to map IPng (or any
   protocol operating above the link level) to ATM services. ATM is a
   "sophisticated" link level technology which provides the potential
   capability for applications at the TCP/UDP level to map to a single
   ATM virtual circuit for transport across an ATM network(s) customized
   to the network performance and traffic requirements for that
   application. This is a step above many of today's existing link
   technologies which can only support a single level of network
   performance that must be shared by all applications operating on a
   single endpoint.

   The future Internet will be comprised of both conventional and
   "sophisticated" link technologies.  The "sophisticated" features of
   link layers like ATM need to be incorporated into an internet where
   data travels not only across an ATM network but also several other
   existing LAN and WAN technologies. Future networks are likely to be a
   combination of subnetworks providing best-effort link level service
   such as Ethernet and also sophisticated subnetworks that can support
   quality of service-based connections like ATM.  One can envision data
   originating from an Ethernet, passing through an ATM network, FDDI
   network, another ATM network, and finally arriving at its destination
   residing on a HIPPI network. IPng packets will travel through such a
   list of interconnected network technologies as ATM is incorporated as
   one of the components of the future Internet.

   To support per application customizable link level connections, four
   types of ATM information should be derivable from the higher level
   protocol(s) like IPng. This ATM information includes: source and
   destination ATM addresses, connection quality of service parameters,
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