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Re: [tsvwg] L4S DSCP (was: L4S drafts: Next Steps)

Ingemar Johansson S <ingemar.s.johansson@ericsson.com> Wed, 24 March 2021 07:34 UTC

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From: Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
To: Steven Blake <slblake@petri-meat.com>, "Black, David" <David.Black@dell.com>
CC: "tsvwg@ietf.org" <tsvwg@ietf.org>, Ingemar Johansson S <ingemar.s.johansson@ericsson.com>
Thread-Topic: [tsvwg] L4S DSCP (was: L4S drafts: Next Steps)
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Date: Wed, 24 Mar 2021 07:34:47 +0000
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Subject: Re: [tsvwg] L4S DSCP (was: L4S drafts: Next Steps)
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Hi Steve, David + others

I believe that it is good to refer back to 
https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-ecn-l4s-id-14#appendix-B.4 
before taking this discussion further.

/Ingemar


> -----Original Message-----
> From: tsvwg <tsvwg-bounces@ietf.org> On Behalf Of Steven Blake
> Sent: den 24 mars 2021 06:53
> To: Black, David <David.Black@dell.com>
> Cc: tsvwg@ietf.org
> Subject: Re: [tsvwg] L4S DSCP (was: L4S drafts: Next Steps)
>
> On Mon, 2021-03-22 at 19:30 +0000, Black, David wrote:
> > Following up on Pete's comment:
> >
> > > Along these lines, there is nothing stopping anyone from using DSCP
> > > (as an appropriate risk control within participating ASs), to
> > > perform experiments to reproduce issues that can be demonstrated in
> > > the lab.
> >
> > That is a commendable approach, particularly as it is effectively
> > recommended by RFC 4774 (Specifying Alternate Semantics for the
> > Explicit Congestion Notification (ECN) Field) - see Section 3 [1], and
> > take note that RFC 4774 is a BCP (Best Current Practice) whose author
> > was the late Sally Floyd.  It may be time for the WG to reconsider the
> > L4S approach of using alternate ECN semantics without qualification by
> > DSCP, at least to run experiments on actual networks.
> >
> > My 0.02 is that an Experimental RFC that used a DSCP to signal the L4S
> > ECN semantics (in participating networks) could have been published at
> > least 2 years ago.
>
> I agree wholeheartedly (as I have said multiple times in the past).
>
> As it stands, the -l4ops draft puts a burden on operators who are minding
> their own business to evaluate and potentially make operational changes to
> their network to avoid potential disruptions to their network performance,
> for the benefit of someone else's experiment. That is not appropriate IMHO
> nor is it necessary when an alternative (DSCP
> isolation) is available.
>
>
> Regards,
>
> // Steve
>
>
>

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