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Re: [netmod] draft-ietf-netconf-rfc7895bis-06 deviation query

Rohit R Ranade <rohitrranade@huawei.com> Tue, 29 May 2018 11:28 UTC

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From: Rohit R Ranade <rohitrranade@huawei.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
CC: Robert Wilton <rwilton@cisco.com>, "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] draft-ietf-netconf-rfc7895bis-06 deviation query
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Date: Tue, 29 May 2018 11:27:42 +0000
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Subject: Re: [netmod] draft-ietf-netconf-rfc7895bis-06 deviation query
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Hi Juergen,

Consider a device supports a dynamic data-store called "ephemeral". Consider Yang-library 1.1 is NOT implemented in device.
Consider device have 3 Modules ==> Module1 ,  Module2-state and Module3

Module1 : Supported in <running> and <operational>
Module2-state : Supported only in <operational>
Module3 : Supported only in <ephemeral>

So here assumption is that Client knows he cannot do <edit-data> on Module2-state as it has only read-only nodes.
But Client does not know the modules in ephemeral and depends on yang-library 1.1 to know whether an edit-data can be done on Module3 ?

Which modules are supported in which data-stores is not known to Client without Yang-library 1.1 ?

With Regards,
Rohit R Ranade

-----Original Message-----
From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs-university.de] 
Sent: 29 May 2018 16:36
To: Rohit R Ranade <rohitrranade@huawei.com>
Cc: Robert Wilton <rwilton@cisco.com>; netmod@ietf.org
Subject: Re: [netmod] draft-ietf-netconf-rfc7895bis-06 deviation query

On Tue, May 29, 2018 at 10:44:04AM +0000, Rohit R Ranade wrote:
> Hi Robert,
> 
> The Introduction section has :
> "
> Furthermore, the operational state datastore may support non-configurable YANG modules in addition to
>    the YANG modules supported by conventional configuration datastores.
> "
> I infer that in the new Yang-library structure,  the schema for "conventional" data-stores should not include the non-configurable YANG module. Is my inference correct ?
>

A module that has only config false nodes will not add anything to a conventional configuration datastore but it is not an error list such a module. For a simple devices, it may be desirable to have just one schema that applies to all datastores. There is no requirement to break things apart just because there is a module that contributes only an empty set to conventional configuration datastores.

Note that the defined term is 'conventional configuration datastore'
and not 'conventional datastore'. Oops, I see that in one place draft-ietf-netconf-rfc7895bis-06.txt missing the 'configuration' part of the term. That should be fixed.

OLD

   The recommended approach to populate "/modules-state" is to report
   the schema for YANG modules that are configurable via conventional
   datastores and for which config false data nodes are returned via a
   NETCONF <get> operation, or equivalent.

NEW

   The recommended approach to populate "/modules-state" is to report
   the schema for YANG modules that are configurable via conventional
   configuration datastores and for which config false data nodes are
   returned via a NETCONF <get> operation, or equivalent.

Co-authors, if you agree, how do we track this?

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>

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