In either case, when they happen, it is better to mark it in some standard way than do it silently IMO.
From: Andy Bierman <a...@yumaworks.com> Sent: Friday, April 14, 2023 12:04 PM To: Jason Sterne (Nokia) <jason.ste...@nokia.com> Cc: Jürgen Schönwälder <jschoenwaelder@constructor.university>; netmod@ietf.org 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 Fri, Apr 14, 2023 at 8:23 AM Jason Sterne (Nokia) <jason.ste...@nokia.com<mailto:jason.ste...@nokia.com>> 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. Yes. And all such changes are non-conforming. It is one thing to make an NBC change to fix a mistake. Quite another to use NBC changes are part of the data model design. Jason Andy > -----Original Message----- > From: Jürgen Schönwälder > <jschoenwaelder@constructor.university<mailto:jschoenwaelder@constructor.university>> > Sent: Friday, April 14, 2023 2:12 AM > To: Andy Bierman <a...@yumaworks.com<mailto:a...@yumaworks.com>> > Cc: Jason Sterne (Nokia) > <jason.ste...@nokia.com<mailto:jason.ste...@nokia.com>>; > netmod@ietf.org<mailto:netmod@ietf.org> > 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<http://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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