RFC 1633 (rfc1633) - Page 1 of 33

Integrated Services in the Internet Architecture: an Overview

Network Working Group                                          R. Braden
Request for Comments: 1633                                           ISI
Category: Informational                                         D. Clark
                                                                     MIT
                                                              S. Shenker
                                                              Xerox PARC
                                                               June 1994


     Integrated Services in the Internet Architecture: an Overview

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.

Abstract

   This memo discusses a proposed extension to the Internet architecture
   and protocols to provide integrated services, i.e., to support real-
   time as well as the current non-real-time service of IP.  This
   extension is necessary to meet the growing need for real-time service
   for a variety of new applications, including teleconferencing, remote
   seminars, telescience, and distributed simulation.

   This memo represents the direct product of recent work by Dave Clark,
   Scott Shenker, Lixia Zhang, Deborah Estrin, Sugih Jamin, John
   Wroclawski, Shai Herzog, and Bob Braden, and indirectly draws upon
   the work of many others.

Table of Contents

   1. Introduction ...................................................2
   2. Elements of the Architecture ...................................3
      2.1 Integrated Services Model ..................................3
      2.2 Reference Implementation Framework .........................6
   3. Integrated Services Model ......................................11
      3.1 Quality of Service Requirements ............................12
      3.2 Resource-Sharing Requirements and Service Models ...........16
      3.3 Packet Dropping ............................................18
      3.4 Usage Feedback .............................................19
      3.5 Reservation Model ..........................................19
   4. Traffic Control Mechanisms .....................................20
      4.1 Basic Functions ............................................20
      4.2 Applying the Mechanisms ....................................23
      4.3 An example .................................................24
   5. Reservation Setup Protocol .....................................25



Braden, Clark & Shenker