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Differentiated Services (Diffserv) and Real-Time Communication (RFC7657)

IP.com Disclosure Number: IPCOM000244997D
Original Publication Date: 2015-Nov-01
Included in the Prior Art Database: 2016-Feb-05
Document File: 52 page(s) / 68K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Black: AUTHOR [+3]

Abstract

This memo 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 Codepoints (DSCPs) [RFC2474]. In the past, distinct RTP streams have been sent over different transport-level flows, sometimes multiplexed with the RTP Control Protocol (RTCP). WebRTC applications, as well as some conferencing applications, are now using the Session Description Protocol (SDP) [RFC4566] bundle negotiation mechanism [SDP-BUNDLE] to send multiple traffic streams with different QoS requirements using the same network 5-tuple. The results of using multiple DSCPs to obtain different QoS treatments within a single network 5-tuple have transport protocol interactions, particularly with congestion control functionality (e.g., reordering). In addition, DSCP markings may be changed or removed between the traffic source and destination. This memo covers the implications of these Diffserv aspects for real-time network communication, including WebRTC traffic [WEBRTC-OVERVIEW].

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Internet Engineering Task Force (IETF)                     D. Black, Ed. Request for Comments: 7657                                           EMC Category: Informational                                         P. Jones ISSN: 2070-1721                                                    Cisco                                                            November 2015

      Differentiated Services (Diffserv) and Real-Time Communication

Abstract

   This memo 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 Codepoints (DSCPs).

   WebRTC applications, as well as some conferencing applications, have

   begun using the Session Description Protocol (SDP) bundle negotiation

   mechanism to send multiple traffic streams with different QoS

   requirements using the same network 5-tuple.  The results of using

   multiple DSCPs to obtain different QoS treatments within a single

   network 5-tuple have transport protocol interactions, particularly

   with congestion control functionality (e.g., reordering).  In

   addition, DSCP markings may be changed or removed between the traffic

   source and destination.  This memo covers the implications of these

   Diffserv aspects for real-time network communication, including

   WebRTC.

Status of This Memo

   This document is not an Internet Standards Track specification; it is    published for informational purposes.

   This document is a product of the Internet Engineering Task Force    (IETF).  It represents the consensus of the IETF community.  It has    received public review and has been approved for publication by the    Internet Engineering Steering Group (IESG).  Not all documents    approved by the IESG are a candidate for any level of Internet    Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,    and how to provide feedback on it may be obtained at    http://www.rfc-editor.org/info/rfc7657.

Black & Jones                 Informational                     [Page 1]
 RFC 7657              Diffserv and RT Communication        November 2015

 Copyright Notice

   Copyright (c) 2015 IETF Trust and the persons identified as the    document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal    Provisions Relating to IETF Documents    (h...