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Re: [tsvwg] DSCPs and L4S: Label DSCP

Jonathan Morton <chromatix99@gmail.com> Tue, 01 June 2021 18:18 UTC

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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Tue, 01 Jun 2021 21:18:33 +0300
Cc: "Black, David" <David.Black@dell.com>, TSVWG <tsvwg@ietf.org>
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To: "C. M. Heard" <heard@pobox.com>
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Subject: Re: [tsvwg] DSCPs and L4S: Label DSCP
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> On 1 Jun, 2021, at 8:35 pm, C. M. Heard <heard@pobox.com> wrote:
> 
> What I don't understand is how this proposal prevents an L4S sender from competing unfairly with classic traffic when traversing a non-participating domain.
> 
> Doesn't the sender need feedback from the receiver that the label DSCP was received? And the the the receiver is itself capable of providing the type of CE feedback that the L4S send needs?

My understanding of this is that L4S traffic is not supposed to *exist* outside of the networks participating in the experiment.  The measures to enforce that invariant are:

1: Don't deploy L4S endpoints outside the participating networks.

2: Use existing Diffserv management infrastructure at the participating networks' border to prevent traffic carrying the Label DSCP from crossing the border (or, possibly, to limit their volume to a presumed harmless level).

If I've got that wrong, I expect to hear a correction.

 - Jonathan Morton

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