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Re: [Netmod-ver-dt] [netmod-wg/yang-ver-dt] Status obsolete nodes (#2)

Balázs Lengyel <balazs.lengyel@ericsson.com> Wed, 05 June 2019 13:35 UTC

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From: Balázs Lengyel <balazs.lengyel@ericsson.com>
To: "netmod-ver-dt@ietf.org" <netmod-ver-dt@ietf.org>
Thread-Topic: [Netmod-ver-dt] [netmod-wg/yang-ver-dt] Status obsolete nodes (#2)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod-ver-dt/YBixUBPHn99mbnYuX0Y9Awu1mjQ>
Subject: Re: [Netmod-ver-dt] [netmod-wg/yang-ver-dt] Status obsolete nodes (#2)
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Mandatory and status are orthogonal in rfc7950. They do not effect each other. If the schema node is supported, it is mandatory to use.

I agree that the specification of obsolete is bad in current YANG. I wanted to correct it for a long time, but some people claimed that if it was OK for SNMP it is OK for us too; which is a good argument if you are discussing preservation of national monuments, but otherwise it is ...

regards Balazs

On 2019. 06. 05. 15:23, Sterne, Jason (Nokia - CA/Ottawa) wrote:

I would have thought that "status obsolete" would trump "mandatory".

 

It seems a bit odd to provide support for a node marked obsolete. Do we think there are servers out there today that support them?

 

From: Rob Wilton (rwilton) <rwilton@cisco.com>
Sent: Wednesday, June 5, 2019 4:46 AM
To: Sterne, Jason (Nokia - CA/Ottawa) <jason.sterne@nokia.com>; netmod-ver-dt@ietf.org
Subject: RE: [netmod-wg/yang-ver-dt] Status obsolete nodes (#2)

 

Yes.  At the moment, a server is allowed to implement obsolete nodes that can break a client.

 

E.g. if an obsolete config node is mandatory, and it is implemented then the client must provide it, and if it is not implemented then the client must not provide it, and there is no way for a client to determine from the server whether it is implemented.

 

Thanks,

Rob

 

 

From: Netmod-ver-dt <netmod-ver-dt-bounces@ietf.org> On Behalf Of Sterne, Jason (Nokia - CA/Ottawa)
Sent: 04 June 2019 18:54
To: netmod-ver-dt@ietf.org
Subject: Re: [Netmod-ver-dt] [netmod-wg/yang-ver-dt] Status obsolete nodes (#2)

 

I know we wanted a flag for deprecated nodes.  But was there ever confusion about obsolete nodes?

 

From: Robert Wilton <notifications@github.com>
Sent: Tuesday, June 4, 2019 7:16 AM
To: netmod-wg/yang-ver-dt <yang-ver-dt@noreply.github.com>
Cc: Subscribed <subscribed@noreply.github.com>
Subject: Re: [netmod-wg/yang-ver-dt] Status obsolete nodes (#2)

 

The YANG library changes indicate whether status obsolete nodes are implemented by the server., which I think is as much as we can do in this draft.

Otherwise, this issue can be deferred to YANG.Next. https://github.com/netmod-wg/yang-next/issues/63" rel="nofollow">netmod-wg/yang-next#63

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Balazs Lengyel                       Ericsson Hungary Ltd.
Senior Specialist
Mobile: +36-70-330-7909              email: Balazs.Lengyel@ericsson.com

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