Subject: Re: [alto] Robert Wilton's Discuss on draft-ietf-alto-cost-mode-03: (with DISCUSS)

From: "Rob Wilton (rwilton)" <[email-masked]>
Date: Tue, 31 May 2022 13:00:50 +0000

Hi Med, & Qin,

Qin, sorry for not replying earlier, busy last week and on PTO (in theory ;-) this week.

Anyway, the proposed text changes look good and is sufficient for me.

I will clear my discuss.

Regards,
Rob

-----Original Message-----
From: [email-masked] <[email-masked]> 
Sent: 31 May 2022 13:52
To: Rob Wilton (rwilton) <[email-masked]>; The IESG <[email-masked]>
Cc: [email-masked]; [email-masked]; [email-masked]; [email-masked]
Subject: RE: Robert Wilton's Discuss on draft-ietf-alto-cost-mode-03: (with DISCUSS)

Hi Rob, 

FWIW, we added a NEW text to explain how the new modes can be discovered using legacy means: https://tinyurl.com/cost-mode-latest. 

Thanks for the review. 

Cheers,
Med

> -----Message d'origine-----
> De : Robert Wilton via Datatracker <[email-masked]>
> Envoyé : mercredi 25 mai 2022 17:06
> À : The IESG <[email-masked]>
> Cc : [email-masked]; [email-masked];
> [email-masked]; [email-masked]; [email-masked]
> Objet : Robert Wilton's Discuss on draft-ietf-alto-cost-mode-03:
> (with DISCUSS)
> 
> Robert Wilton has entered the following ballot position for
> draft-ietf-alto-cost-mode-03: Discuss
> 
> When responding, please keep the subject line intact and reply to
> all email addresses included in the To and CC lines. (Feel free to
> cut this introductory paragraph, however.)
> 
> 
> Please refer to
> https://www.ietf.org/about/groups/iesg/statements/handling-ballot-
> positions/
> for more information about how to handle DISCUSS and COMMENT
> positions.
> 
> 
> The document, along with other ballot positions, can be found
> here:
> https://datatracker.ietf.org/doc/draft-ietf-alto-cost-mode/
> 
> 
> 
> ------------------------------------------------------------------
> ----
> DISCUSS:
> ------------------------------------------------------------------
> ----
> 
> Hi,
> 
> This is a "discuss" discuss, as in I'm not sure the document is
> wrong, but I
> thought that it would be helpful to flag this for further
> discussion.
> 
> In RFC 7285, cost-mode is defined as a field that MUST take one of
> two string
> values, either "numerical" or "ordinal".  I'm not really familiar
> with RFC
> 7285, and in particular, whether a receiver is required to
> explicitly check
> that the received data must take one of these two values, or
> whether a
> reasonable implementation could check for a single value, and if
> doesn't match
> that value assume that it must be the other value (since there are
> only two
> allowed values).  Obviously, moving to more than two values could
> then cause
> this assumption to break in existing implementations.  Was this
> issue
> considered and discussed by the WG?  It looks like alto does
> support a
> versioning mechanism (i.e., by defining new media types) that
> might allow the
> definition of this field to be upgraded in a safer way.  Was that
> approach
> considered?
> 
> Regards,
> Rob
> 
> 
> 
> 

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