Re-,

Deal!

As you can see at 
https://www.ietf.org/rfcdiff?url2=draft-ietf-alto-cost-mode-05, went with a 
more verbose text to insist on this + add a MUST for implementations.

Thanks.

Cheers,
Med

De : Murray S. Kucherawy <[email protected]>
Envoyé : jeudi 2 juin 2022 08:58
À : BOUCADAIR Mohamed INNOV/NET <[email protected]>
Cc : The IESG <[email protected]>; [email protected]; 
[email protected]; [email protected]; [email protected]
Objet : Re: Murray Kucherawy's Discuss on draft-ietf-alto-cost-mode-04: (with 
DISCUSS and COMMENT)

On Wed, Jun 1, 2022 at 11:54 PM 
<[email protected]<mailto:[email protected]>> 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

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