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Re: [tsvwg] Question about proper node behavior -ECN

Jonathan Morton <chromatix99@gmail.com> Mon, 22 May 2023 06:09 UTC

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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Mon, 22 May 2023 09:09:17 +0300
Cc: Greg White <g.white=40cablelabs.com@dmarc.ietf.org>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>, Ingemar Johansson S <ingemar.s.johansson=40ericsson.com@dmarc.ietf.org>, "tsvwg@ietf.org" <tsvwg@ietf.org>
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To: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
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Subject: Re: [tsvwg] Question about proper node behavior -ECN
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> On 22 May, 2023, at 9:05 am, Ingemar Johansson S <ingemar.s.johansson@ericsson.com> wrote:
> 
> I believe that it pretty much explains that Not-ECT should not be changed to any of the other ECN code points in a network.
> 
> ECT(0) to ECT(1) is an open question as I see it but I guess that it is safe to state that network nodes that are to comply to RFC9331 should not implement such behavior ?

I think that's a safe assumption, yes.  Absent some concrete reason to do so, network nodes should only be changing ECT(0) or ECT(1) to CE, for the purpose of congestion signalling; no other change to the ECN field is expected to occur.

 - Jonathan Morton

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