> On Apr 14, 2023, at 11:23 AM, Jason Sterne (Nokia) <[email protected]> 
> wrote:
> 
> IETF and vendor models are already doing NBC changes. The versioning work is 
> mostly just adding a way to indicate that to users/clients when it happens.

But with new versions of the complete model and not incremental augmentations - 
right? Although I haven’t looked at this for a long time, the YANG tooling will 
flag these as NBC



Thanks,
Acee



> Jason
> 
>> -----Original Message-----
>> From: Jürgen Schönwälder <[email protected]>
>> Sent: Friday, April 14, 2023 2:12 AM
>> To: Andy Bierman <[email protected]>
>> Cc: Jason Sterne (Nokia) <[email protected]>; [email protected]
>> Subject: Re: [netmod] Unknown bits - backwards compatibility
>> 
>> 
>> CAUTION: This is an external email. Please be very careful when clicking 
>> links or
>> opening attachments. See the URL nok.it/ext for additional information.
>> 
>> 
>> 
>> On Thu, Apr 13, 2023 at 02:32:28PM -0700, Andy Bierman wrote:
>>> 
>>> I do not see any way to interpret RFC 7950 such that a YANG
>>> extension can be added later to another document that overrides any
>>> normative behavior defined in RFC 7950.
>>> 
>>> So as long as a vendor wants to claim conformance to YANG 1.1, no
>>> MUSTs in 7950 can be violated. Period.  That may be harsh, but MUST
>>> and MUST NOT work that way.
>> 
>> +1 (even though we may be getting off topic here)
>> 
>> /js
>> 
>> --
>> Jürgen Schönwälder              Constructor University Bremen gGmbH
>> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
>> Fax:   +49 421 200 3103         <https://constructor.university/>
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