RFC 2686 (rfc2686) - Page 1 of 11

The Multi-Class Extension to Multi-Link PPP

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Network Working Group                                         C. Bormann
Request for Comments: 2686                       Universitaet Bremen TZI
Category: Standards Track                                 September 1999


              The Multi-Class Extension to Multi-Link PPP

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 Notice

   Copyright (C) The Internet Society (1999).  All Rights Reserved.

Abstract

   A companion document describes an architecture for providing
   integrated services over low-bitrate links, such as modem lines, ISDN
   B-channels, and sub-T1 links [1].  The main components of the
   architecture are: a real-time encapsulation format for asynchronous
   and synchronous low-bitrate links, a header compression architecture
   optimized for real-time flows, elements of negotiation protocols used
   between routers (or between hosts and routers), and announcement
   protocols used by applications to allow this negotiation to take
   place.

   This document proposes the fragment-oriented solution for the real-
   time encapsulation format part of the architecture.  The general
   approach is to start from the PPP Multilink fragmentation protocol
   [2] and provide a small number of extensions to add functionality and
   reduce the overhead.

1.  Introduction

   As an extension to the "best-effort" services the Internet is well-
   known for, additional types of services ("integrated services") that
   support the transport of real-time multimedia information are being
   developed for, and deployed in the Internet.

   The present document defines the fragment-oriented solution for the
   real-time encapsulation format part of the architecture, i.e. for the
   queues-of-fragments type sender [1].  As described in more detail in
   the architecture document, a real-time encapsulation format is



Bormann                     Standards Track
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