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Re: [Dart] [AVTCORE] Colin Perkins comments - WGLC: draft-ietf-dart-dscp-rtp-02

"Ali C. Begen (abegen)" <abegen@cisco.com> Tue, 26 August 2014 10:21 UTC

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From: "Ali C. Begen (abegen)" <abegen@cisco.com>
To: Colin Perkins <csp@csperkins.org>
Thread-Topic: [AVTCORE] [Dart] Colin Perkins comments - WGLC: draft-ietf-dart-dscp-rtp-02
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Date: Tue, 26 Aug 2014 10:21:37 +0000
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Subject: Re: [Dart] [AVTCORE] Colin Perkins comments - WGLC: draft-ietf-dart-dscp-rtp-02
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On Aug 26, 2014, at 1:17 PM, Colin Perkins <csp@csperkins.org> wrote:

>> I suspect we can all agree that RTCP information is important.  It's just the DSCP-related guidance that goes with that that is challenging.
> 
> I don’t agree that RTCP information should be sent as higher priority than the media. Ideally, it should be sent with the same priority as the media, so it can be used to sample the RTT. This RTT sample is independent of RMCAT. 

Agreed. RTCP should not have any higher priority than RTP media. First, you don't want RTCP traffic to cause damage to RTP traffic. Second, not being in the same class, RTCP reported data wont reflect the reality for RTP traffic. If you want protection for RTCP packets, use redundancy or other techniques within the bounds allowed by 3550.

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