RFC 7657

Differentiated Services (Diffserv) and Real-Time Communication, November 2015

Canonical URL:
https://www.rfc-editor.org/rfc/rfc7657.txt
File formats:
Plain TextPDF
Status:
INFORMATIONAL
Authors:
D. Black, Ed.
P. Jones
Stream:
IETF
Source:
dart (rai)

Cite this RFC: TXT  |  XML

DOI:  10.17487/RFC7657

Discuss this RFC: Send questions or comments to dart@ietf.org

Other actions: Find Errata (if any)  |  Submit Errata  |  Find IPR Disclosures from the IETF


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.


For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.


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