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Re: [Netconf] schema capabilities in hello

Mahesh Jethanandani <mjethanandani@gmail.com> Thu, 10 May 2018 05:19 UTC

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From: Mahesh Jethanandani <mjethanandani@gmail.com>
In-Reply-To: <alpine.DEB.2.20.1805090912150.17103@uplift.swm.pp.se>
Date: Wed, 09 May 2018 22:19:39 -0700
Cc: Netconf <netconf@ietf.org>, Mikael Abrahamsson <swmike@swm.pp.se>
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To: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [Netconf] schema capabilities in hello
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Martin,

> On May 9, 2018, at 12:13 AM, Mikael Abrahamsson <swmike@swm.pp.se> wrote:
> 
> On Wed, 9 May 2018, Martin Bjorklund wrote:
> 
>> Noone is wrong.  The YANG 1.0-only NMS won't understand the 1.1 modules in the server anyway.  Note that if the server implements a mix of 1.0 and 1.1 modules, all 1.0 modules MUST be listed in <hello>.

Do you mean to say that a server that supports both YANG 1.0 and YANG 1.1 modules, needs to advertise 1.0 modules in <hello> and 1.1 modules in the yang-library?

> 
> Thanks for the clarification, I think this distinction is non-obvious so great to get this explicitly stated.

I would agree with Mikael. It was not clear reading the drafts what a NETCONF server that wants to support both YANG 1.0 and YANG 1.1 supposed to do.

As I see it there are some of the following implementation possibilities (with the caveat about the question above):

- NETCONF Server supports YANG 1.0, and advertises schema capabilities as part of <hello> message.
- NETCONF non-NMDA Server supports YANG 1.1, and advertises schema capabilities as part of yang-library:1.0
- NETCONF NMDA Server supports YANG 1.1, and advertises schema capabilities as part of yang-library:1.1
- NETCONF non-NMDA Server supports YANG 1.0 and 1.1, and advertises schema in both <hello> and yang-library:1.0
- NETCONF NMDA Server supports YANG 1.0 and 1.1, and advertises schema in both <hello> and yang-library:1.1

Would this be right?

> 
> -- 
> Mikael Abrahamsson    email: swmike@swm.pp.se
> 
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Mahesh Jethanandani
mjethanandani@gmail.com

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