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[tsvwg] draft-morton-tsvwg-sce: "Permitted ECN codepoint packet transitions"

Neal Cardwell <ncardwell@google.com> Thu, 14 November 2019 14:16 UTC

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From: Neal Cardwell <ncardwell@google.com>
Date: Thu, 14 Nov 2019 09:16:30 -0500
Message-ID: <CADVnQynGEEmt2vYEX5e=bA9YW+mHpSJ7Z3W9K4nSfv_gk_Svwg@mail.gmail.com>
To: "Rodney W. Grimes" <4bone@gndrsh.dnsmgr.net>
Cc: tsvwg IETF list <tsvwg@ietf.org>, Jonathan Morton <chromatix99@gmail.com>
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Subject: [tsvwg] draft-morton-tsvwg-sce: "Permitted ECN codepoint packet transitions"
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On Thu, Nov 14, 2019 at 8:50 AM Rodney W. Grimes
<4bone@gndrsh.dnsmgr.net> wrote:
>
> Hello tsvwg list members,
>
> It is our intent to ask for adoption by the TSVWG of draft-morton-tsvwg-sce
> (https://tools.ietf.org/html/draft-morton-tsvwg-sce-01) during the IETF/106
> Singapore TSVWG session.

One random thought: the draft-morton-tsvwg-sce-01 draft mentions:

   Permitted ECN codepoint packet transitions by middleboxes are:

           Not-ECT ->   Not-ECT (or drop)
           ECT     ->   ECT or SCE or CE
           SCE     ->   SCE or CE
           CE      ->   CE

Presumably if the buffer space is full and an ECT-, SCE-, or CE-marked
packet arrives then that packet can be dropped. So presumably "drop"
is permitted from those codepoint states as well. (I see the point
that hopefully this will be rare for ECT/SCE/CE packets, but with
bursty connection arrivals it seems important to clarify that this is
possible.)

Since a drop is not really an "ECN codepoint packet transition", and
can happen to any packet, perhaps "(or drop)" could be omitted from
the table, for clarity? And as a replacement, the text could mention
something about "drop" being a possibility for packets marked with any
of those ECN code points?

best,
neal

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