draft-ietf-tsvwg-rtcweb-qos-06.txt   draft-ietf-tsvwg-rtcweb-qos-07.txt 
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Network Working Group S. Dhesikan Network Working Group S. Dhesikan
Internet-Draft C. Jennings Internet-Draft C. Jennings
Intended status: Standards Track Cisco Systems Intended status: Standards Track Cisco Systems
Expires: June 20, 2016 D. Druta, Ed. Expires: June 20, 2016 D. Druta, Ed.
AT&T AT&T
P. Jones P. Jones
Cisco Systems Cisco Systems
December 18, 2015 December 18, 2015
DSCP and other packet markings for WebRTC QoS DSCP and other packet markings for WebRTC QoS
draft-ietf-tsvwg-rtcweb-qos-06 draft-ietf-tsvwg-rtcweb-qos-07
Abstract Abstract
Many networks, such as service provider and enterprise networks, can Many networks, such as service provider and enterprise networks, can
provide treatment for individual packets based on Differentiated provide treatment for individual packets based on Differentiated
Services Code Point (DSCP) values on a per-hop basis. This document Services Code Point (DSCP) values on a per-hop basis. This document
provides the recommended DSCP values for browsers to use for various provides the recommended DSCP values for browsers to use for various
classes of traffic. classes of traffic.
Status of This Memo Status of This Memo
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4. Inputs 4. Inputs
The below uses the concept of a media flow, however this is usually The below uses the concept of a media flow, however this is usually
not equivalent to a transport-layer flow defined by a 5-tuple (source not equivalent to a transport-layer flow defined by a 5-tuple (source
address, destination address, source port, destination port, and address, destination address, source port, destination port, and
protocol). Instead each media flow, such as an RTP stream protocol). Instead each media flow, such as an RTP stream
[I-D.ietf-rtcweb-rtp-usage] or SCTP association carrying data channel [I-D.ietf-rtcweb-rtp-usage] or SCTP association carrying data channel
packets [I-D.ietf-rtcweb-data-channel], contains all the packets packets [I-D.ietf-rtcweb-data-channel], contains all the packets
associated with an independent media entity within one 5-tuple. associated with an independent media entity within one 5-tuple.
Specifically, a media flow is the transmitted packets for an RTP There may be multiple media flows within the same 5-tuple. These
session or an SCTP association. There may be multiple media flows media flows might consist of different media types and have different
within the same 5-tuple. These media flows might consist of levels of importance to the application and, therefore, each
different media types and have different levels of importance to the potentially marked using different DSCP values than for another media
application and, therefore, each potentially marked using different flow multiplexed over the same transport-layer flow. The following
DSCP values than for another media flow multiplexed over the same are the inputs that the browser provides to the media engine:
transport-layer flow. The following are the inputs that the browser
provides to the media engine:
o Data Type: The browser provides this input as it knows if the flow o Data Type: The browser provides this input as it knows if the flow
is audio, interactive video with or without audio, non-interactive is audio, interactive video with or without audio, non-interactive
video with or without audio, or data. video with or without audio, or data.
o Application Priority: Another input is the relative importance of o Application Priority: Another input is the relative importance of
the flow within that data type. Many applications have multiple the flow within that data type. Many applications have multiple
media flows of the same data type and often some flows are more media flows of the same data type and often some flows are more
important than others. For example, in a video conference where important than others. For example, in a video conference where
there are usually audio and video flows, the audio flow may be there are usually audio and video flows, the audio flow may be
more important than the video flow. JavaScript applications can more important than the video flow. JavaScript applications can
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