RFC 1821 (rfc1821) - Page 1 of 24

Integration of Real-time Services in an IP-ATM Network Architecture

Network Working Group                                          M. Borden
Request for Comments: 1821                                    E. Crawley
Category: Informational                                     Bay Networks
                                                                B. Davie
                                                                Bellcore
                                                              S. Batsell
                                                                     NRL
                                                             August 1995


  Integration of Real-time Services in an IP-ATM Network Architecture

Status of the 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.

Abstract

   The IETF is currently developing an integrated service model which is
   designed to support real-time services on the Internet.
   Concurrently, the ATM Forum is developing Asynchronous Transfer Mode
   networking which similarly provides real-time networking support. The
   use of ATM in the Internet as a link layer protocol is already
   occurring, and both the IETF and the ATM Forum are producing
   specifications for IP over ATM. The purpose of this paper is to
   provide a clear statement of what issues need to be addressed in
   interfacing the IP integrated services environment with an ATM
   service environment so as to create a seamless interface between the
   two in support of end users desiring real-time networking services.

Table of Contents

   1.0 Introduction                                                2
   2.0 Problem Space Overview                                      3
   2.1 Initial Assumptions                                         3
   2.2 Topologies Under Consideration                              4
   2.3 Providing QoS in IP over  ATM - a walk-though               5
   3.0 Service Model Issues                                        6
   3.1 Traffic Characterization                                    7
   3.2 QoS Characterization                                        8
   4.0 Resource Reservation Styles                                10
   4.1 RSVP                                                       10
   4.2 ST-II                                                      13
   4.3 Mapping IP flows to ATM Connections                        15
   5.0 End System Issues                                          16
   6.0 Routing Issues                                             16



Borden, et al                Informational