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Re: [rtcweb] Call for adoption of QoS draft

"Cullen Jennings (fluffy)" <fluffy@cisco.com> Mon, 17 September 2012 22:16 UTC

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From: "Cullen Jennings (fluffy)" <fluffy@cisco.com>
To: "James Polk (jmpolk)" <jmpolk@cisco.com>
Thread-Topic: [rtcweb] Call for adoption of QoS draft
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Date: Mon, 17 Sep 2012 22:16:14 +0000
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Cc: "<rtcweb@ietf.org>" <rtcweb@ietf.org>
Subject: Re: [rtcweb] Call for adoption of QoS draft
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On Sep 10, 2012, at 18:16 , James Polk wrote:

> At 04:27 PM 9/10/2012, Martin Thomson wrote:
>> On 10 September 2012 14:12, James Polk <jmpolk@cisco.com> wrote:
>>> MMUSIC has a WG item that should provide this indication/hint, in a
>>> trafficclass label attribute. Browsers identifying a small set of labels
>>> from that effort should do the trick. See
>>> 
>>> http://www.ietf.org/internet-drafts/draft-ietf-mmusic-traffic-class-for-sdp-02.txt
>> 
>> Thanks James, that looks like what is needed.  It's not exactly the
>> same thing as the priority draft, so I'm not sure how I'd map all the
>> way from priority (1-3) to traffic class labels to the DSCP markings
>> described in Cullen's draft.
> 
> I'm not sure only 3 priorities are needed, though I believe 3 will get used. The point of the trafficclass labels (TCL) is to add a level of abstraction to what the actual DSCPs need to be by allowing each domain that is aware of the type of traffic choose the appropriate DSCP for that type of traffic.

The problem with using TCL here is the browser has no idea how to find out the mapping from TCL to DSCP for the domain it is currently running in so it can't use TCL to set the DSCP on the media packets. Subha and I talked about this a bunch and can not see any way to make TCL work.

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