Differentiated Services (DiffServ) and Real-time Communication
draft-ietf-dart-dscp-rtp-02

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DiffServ Applied to Real-time Transports                   D. Black, Ed.
Internet-Draft                                                       EMC
Intended status: Informational                                  P. Jones
Expires: February 9, 2015                                          Cisco
                                                          August 8, 2014

     Differentiated Services (DiffServ) and Real-time Communication
                      draft-ietf-dart-dscp-rtp-02

Abstract

   This document describes the interaction between Differentiated
   Services (DiffServ) network quality of service (QoS) functionality
   and real-time network communication, including communication based on
   the Real-time Transport Protocol (RTP).  DiffServ is based on network
   nodes applying different forwarding treatments to packets whose IP
   headers are marked with different DiffServ Code Points (DSCPs).  As a
   result, use of different DSCPs within a single traffic stream may
   cause transport protocol interactions (e.g., reordering).  In
   addition, DSCP markings may be changed or removed between the traffic
   source and destination.  This document covers the implications of
   these DiffServ aspects for real-time network communication, including
   RTCWEB.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on February 9, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Black & Jones           Expires February 9, 2015                [Page 1]
Internet-Draft        DiffServ and RT Communication          August 2014

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Real Time Communications  . . . . . . . . . . . . . . . . . .   3
     2.1.  RTP Background  . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  RTP Multiplexing  . . . . . . . . . . . . . . . . . . . .   5
   3.   Differentiated Services (DiffServ) . . . . . . . . . . . . .   7
     3.1.  Diffserv PHBs (Per-Hop Behaviors) . . . . . . . . . . . .   9
     3.2.  Traffic Classifiers and DSCP Remarking  . . . . . . . . .   9
   4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   5.  DiffServ Interactions . . . . . . . . . . . . . . . . . . . .  12
     5.1.  DiffServ, Reordering and Transport Protocols  . . . . . .  12
     5.2.  DiffServ, Reordering and Real-Time Communication  . . . .  14
     5.3.  Drop Precedence and Transport Protocols . . . . . . . . .  14
   6.  Guidelines  . . . . . . . . . . . . . . . . . . . . . . . . .  16
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  18
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  18
     10.2.  Informative References . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  24

1.  Introduction

   This document describes the interactions between Differentiated
   Services (DiffServ) network quality of service (QoS) functionality
   [RFC2475] and real-time network communication, including
   communication based on the Real-time Transport Protocol (RTP)
   [RFC3550].  DiffServ is based on network nodes applying different
   forwarding treatments to packets whose IP headers are marked with
   different DiffServ Code Points (DSCPs)[RFC2474].  As a result use of
   different DSCPs within a single traffic stream may cause transport
   protocol interactions (e.g., reordering).  In addition, DSCP markings
   may be changed or removed between the traffic's source and
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