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

Balazs Lengyel <balazs.lengyel@ericsson.com> Wed, 15 November 2017 17:41 UTC

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To: Martin Bjorklund <mbj@tail-f.com>, lhotka@nic.cz
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From: Balazs Lengyel <balazs.lengyel@ericsson.com>
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Subject: Re: [netmod] Comment on draft-clacla-netmod-yang-model-update-02
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On 2017-11-15 21:20, Martin Bjorklund wrote:
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
BALAZS: Actually this exactly one of my problems. See other letter for my 3 problems. This is one cause of 2)


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
BALAZS: You still need at leaast deprecated: my proposal
o  "deprecated" schema nodes MUST still work as defined by the YANG module. 
       The deprecated status serves only as a a warning that the schema node 
       will be removed or obsoleted in the future." 
-- 
Balazs Lengyel                       Ericsson Hungary Ltd.
Senior Specialist
Mobile: +36-70-330-7909              email: Balazs.Lengyel@ericsson.com

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