Re: [alto] Murray Kucherawy's Discuss on draft-ietf-alto-cost-mode-04: (with DISCUSS and COMMENT)

"Murray S. Kucherawy" <superuser@gmail.com> Thu, 02 June 2022 06:58 UTC

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From: "Murray S. Kucherawy" <superuser@gmail.com>
Date: Wed, 01 Jun 2022 23:57:55 -0700
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To: mohamed.boucadair@orange.com
Cc: The IESG <iesg@ietf.org>, "draft-ietf-alto-cost-mode@ietf.org" <draft-ietf-alto-cost-mode@ietf.org>, "alto-chairs@ietf.org" <alto-chairs@ietf.org>, "alto@ietf.org" <alto@ietf.org>, "kaigao@scu.edu.cn" <kaigao@scu.edu.cn>
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Subject: Re: [alto] Murray Kucherawy's Discuss on draft-ietf-alto-cost-mode-04: (with DISCUSS and COMMENT)
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On Wed, Jun 1, 2022 at 11:54 PM <mohamed.boucadair@orange.com> wrote:

> [Med] That wording was on purpose. We could easily turn that text into the
> following:
>
> NEW:
>  If the definition of a cost mode does not indicate whether it
>  applies to a subset of cost metrics, ALTO implementations
>  MUST be prepared to accept that cost mode for any cost metric.
>
> ... but there is a high risk that this behavior will overlooked and thus
> the default mode will be the rule. This would have interoperability
> implications as it is likely that some modes can't be associated with all
> cost metrics.
>
> The SHOULD is some sort of authors guideline to assess the applicability
> and record it.
>

Hi Mohamed,

Understood.  I suggest using "should" rather than "SHOULD", and then saying
something like what you just said here to underscore why it's important for
future documents to go into this.

-MSK