Re: [Idr] Warren Kumari's Discuss on draft-ietf-idr-ext-opt-param-11: (with DISCUSS and COMMENT)

John Scudder <jgs@juniper.net> Wed, 21 April 2021 15:04 UTC

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From: John Scudder <jgs@juniper.net>
To: Warren Kumari <warren@kumari.net>
CC: The IESG <iesg@ietf.org>, "draft-ietf-idr-ext-opt-param@ietf.org" <draft-ietf-idr-ext-opt-param@ietf.org>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "idr@ietf. org" <idr@ietf.org>, Hares Susan <shares@ndzh.com>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "acmorton@att.com" <acmorton@att.com>
Thread-Topic: Warren Kumari's Discuss on draft-ietf-idr-ext-opt-param-11: (with DISCUSS and COMMENT)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/cI5_TMst6FT7c9FiGZZN2aQ63t4>
Subject: Re: [Idr] Warren Kumari's Discuss on draft-ietf-idr-ext-opt-param-11: (with DISCUSS and COMMENT)
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Hi Warren,

Thanks for your comment. 

I understand the “too clever by half” reaction. As I recall the motivation for this was that in the future we might want to migrate to using only this encoding. The "encode the short stuff the short way" is the obviously right thing to do for the immediate future, because the extension isn't (can't be) signaled. But in ten years or something, it potentially starts to feel annoying to have to drag the old encoding along even though everyone already adopted the new one a decade back. So this leaves the door open to us making that transition painlessly and without drama.

Regards,

—John

> On Apr 20, 2021, at 6:32 PM, Warren Kumari via Datatracker <noreply@ietf.org> wrote:
> 
> 
> Warren Kumari has entered the following ballot position for
> draft-ietf-idr-ext-opt-param-11: 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://urldefense.com/v3/__https://www.ietf.org/iesg/statement/discuss-criteria.html__;!!NEt6yMaO-gk!RwBGRElSG71MB-4xuoZ_K7AsJh9Ov1reQdYmsqJiiijBgUzS0Q__vFRx6cpoZA$
> for more information about DISCUSS and COMMENT positions.
> 
> 
> The document, along with other ballot positions, can be found here:
> https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-ietf-idr-ext-opt-param/__;!!NEt6yMaO-gk!RwBGRElSG71MB-4xuoZ_K7AsJh9Ov1reQdYmsqJiiijBgUzS0Q__vFQWHO5WBg$
> 
> 
> 
> ----------------------------------------------------------------------
> DISCUSS:
> ----------------------------------------------------------------------
> 
> This should be a trivial to clear DISCUSS.
> This text terrifies me:
> "It is not considered a fatal error to receive an OPEN message whose
> (non-extended) Optional Parameters Length value is not 255, and whose first
> Optional Parameter type code is 255 -- in this case the encoding of this
> specification MUST be used for decoding the message. A warning MAY be logged."
> It smacks of trying to be too clever, and that the correct response (IMO) when
> trying to set up a session with something obviously broken is to abort and
> throw an error.
> 
> However, I'm sure that there was some discussion, and that the WG decided that
> this was a good idea; unfortunately I was unable to find anything discussion on
> this, so all I'm asking for is some reassurance that this was discussed and
> that this behavior was chosen as a good idea...
> 
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> Thank you for this document. It is clear, and solves a real problem.
> 
> Also, thanks to Al Morton for his OpsDir review - as always, it is much appreciated.
> 
> 
>