Re: [netmod] Comment on draft-clacla-netmod-yang-model-update-02

Ladislav Lhotka <lhotka@nic.cz> wrote:
> On Wed, 2017-11-15 at 12:17 +0100, Martin Bjorklund wrote:
> > Balazs Lengyel <balazs.lengyel@ericsson.com> wrote:
> > > The server MAY implement obsoleted nodes or MAY NOT. This may or may
> > > not  is not good enough as a contract for the management client.  My
> > > problem is that the current solution is just not good enough. IMHO we
> > > need to change it.
> > 
> > Note that if a server implements version 1 of a module, and then the
> > module doesn't change, but the server in the next sw version drops
> > support for the module, the client will also be unhappy.  We (the
> > IETF) can't have rules for these kinds of things.
> 
> If the server drops support for a module, then that module has to disappear from
> YANG library, so it is a priori known that it happened. With deprecated/obsolete
> nodes, a server may drop their support without any notice, within the same
> module&revision. 

I agree that *that* is a problem, but that's not what Balazs asked about.

/martin

> > > new stuff with a new name, although that might not be the common
> > > practice.  Which is a good thing, as I believe it is sometimes better
> > > to correct existing definitions then to replace them.
> > 
> > But you still want to require servers to implement even obsolete
> > nodes?
> 
> I think with semver support there will be no need for the "status" statement -
> the nodes just get removed and version number bumped.
> 
> Lada
> 
> > 
> > 
> > /martin
> > 
> > 
> > > 
> > > regards Balazs
> > > 
> > > 
> > > On 2017-11-15 16:53, Martin Bjorklund wrote:
> > > > Exactly.  With the current solution, the sever can still implement the
> > > > deprecated or obsolete nodes in order to support old clients.
> > > > 
> > > > With a MAJOR update in a semver world, it means that the old nodes are
> > > > removed (or rather, possibly, that the old nodes have new syntax
> > > > and/or semantics).
> > > > 
> > > > 
> > > > 
> > > 
> > > -- 
> > > Balazs Lengyel                       Ericsson Hungary Ltd.
> > > Senior Specialist
> > > Mobile: +36-70-330-7909 email: Balazs.Lengyel@ericsson.com
> > > 
> > 
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> -- 
> Ladislav Lhotka
> Head, CZ.NIC Labs
> PGP Key ID: 0xB8F92B08A9F76C67
> 
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