[netmod] YANG Versioning Weekly Call Minutes - 2020-11-03

"Sterne, Jason (Nokia - CA/Ottawa)" <jason.sterne@nokia.com> Wed, 18 November 2020 00:24 UTC

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From: "Sterne, Jason (Nokia - CA/Ottawa)" <jason.sterne@nokia.com>
To: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: YANG Versioning Weekly Call Minutes - 2020-11-03
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Date: Wed, 18 Nov 2020 00:24:17 +0000
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Subject: [netmod] YANG Versioning Weekly Call Minutes - 2020-11-03
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YANG Versioning Weekly Call Minutes - 2020-11-03

We mainly discussed how Packages should work with schema mount.  Some rough notes from the discussion below.

For next week we'll come up with a prioritized list of Versioning topics that need broader WG input.

Rough Notes re schema mount & packages:

- if a server only advertises a single package XX, which describes a mp as mounting YY, then the client is guaranteed of finding YY at the mp (assuming no deviations, module replacements, etc in XX).  TBD: or can the server mount something else there without advertising a different package that describes that mount ?  Can it mount ZZ that is a super-set of YY ?  Is this different from modules because mounts are a run-time concept ?
- might need an additional flag (exact schema vs minimum-set/super-set)

- if 3 packages are listed, then at least 1 of the 3 must be mounted (and no other packages besides those 3 could be at that mp) ? Is that what we want?
- if 0 packages are listed, then you have no idea (undefined)
- the mount-point info in a parent package replaces the mp info in child packages (recursively).  This is also how conflicts are resolved.
- replacing what is available at a mp may or may not be NBC. You have to look at all the versions of all modules at the mp before & after.
   -> TBD: what if packages foo & bar have the identical modules & versions.  Are they the same or different ?  Call it NBC.