Hi Murray, 

Thanks for the review. 

Please see inline. 

Cheers,
Med

> -----Message d'origine-----
> De : Murray Kucherawy via Datatracker <nore...@ietf.org>
> Envoyé : jeudi 2 juin 2022 08:16
> À : The IESG <i...@ietf.org>
> Cc : draft-ietf-alto-cost-m...@ietf.org; alto-cha...@ietf.org;
> alto@ietf.org; kai...@scu.edu.cn
> Objet : Murray Kucherawy's Discuss on draft-ietf-alto-cost-mode-
> 04: (with DISCUSS and COMMENT)
> 
> Murray Kucherawy has entered the following ballot position for
> draft-ietf-alto-cost-mode-04: Discuss
> 
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> 
> 
> ------------------------------------------------------------------
> ----
> DISCUSS:
> ------------------------------------------------------------------
> ----
> 
> Paul said:
> 
> > I think that SHOULD can be a MUST. Although one could question
> the 2119 usage
> as it seems to be a directive to a document author and not a
> protocol action.
> So I would also be okay with lowercasing this.
> 
> I'm ambivalent about the first sentence, but I concur strongly
> with the second;
> use of BCP 14 language to establish a requirement against some
> future document
> seems quite unconventional to me.  Can we talk about why this is
> necessary
> and/or appropriate?

[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.  


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