Re: [AVTCORE] WGLC on draft-ietf-avtcore-ecn-for-rtp-04 - more

Roni Even <> Sat, 22 October 2011 12:08 UTC

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Date: Sat, 22 Oct 2011 14:05:20 +0200
From: Roni Even <>
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Subject: Re: [AVTCORE] WGLC on draft-ietf-avtcore-ecn-for-rtp-04 - more
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I finished the review.


1.      In section 7.2  "All session participants connected over the same
transport   will need to use the same initiation method. " maybe say MUST
use instead of will need to use.

2.       In section 7.2 " If support for both in-band and out-of-band
mechanisms is signalled, the sender SHOULD try ECN negotiation using  STUN
with ICE first, and if it fails, fallback to negotiation using  RTP and RTCP
ECN feedback" I think that it should say that the sender should offer ice
initialization method before rtp.

3.       In section 7.2.1 you reference the no-op draft. Why not reference
the keep-alive RFC

4.       In section 7.2.1 Generating RTCP ECN Feedback it says "Reception of
subsequent ECN-CE marked packets MUST  result in additional early or
immediate ECN". Why use MUST and not SHOULD since there is an exception case
following the sentence.

5.       In section 7.2.1 "ECN initiation is considered to have failed at
the instant when any RTP session participant sends an RTCP packet that
doesn't  contain an RTCP ECN feedback report or ECN summary report " The
RTCP ECN feedback report may be missing for other reasons like no timely
response or using AVP profile.

6.       In section 7.3.3 receiver driven congestion control you mention
layered codecs as an option I think that using ccm tmbbr is more useful when
there are no layered codecs in use (more common today) and should be
mentioned in this section.

7.       In section 10.6 you use the wrong range definition "From RFC 5389:
STUN Attribute types in the first half of the comprehension-required range
(0x0000 - 0x3FFF) and in the first half of the comprehension- optional range
(0x8000 - 0xBFFF) are assigned by IETF Review"


Roni Even

As individual






From: [] On Behalf Of Roni
Sent: Friday, September 30, 2011 3:29 PM
Subject: [AVTCORE] WGLC on draft-ietf-avtcore-ecn-for-rtp-04



I would like to start a WGLC on , Explicit
Congestion Notification (ECN) for RTP over UDP.

The WGLC will end on October 21, 2011


Please review the draft and send comments to the list.



Roni Even