Re: [Netconf] draft-ietf-netconf-nmda-netconf review

Hi Mahesh,

On 15/05/2018 09:36, Mahesh Jethanandani wrote:
> A quick review of the draft has revealed the following issue and question.
>
> 1. A run of pyang on the model reveals the following:
>
>> pyang --ietf ietf-netconf-nmda@2018-04-20.yang
> ietf-netconf-nmda@2018-04-20.yang:205: warning: RFC 6087: 4.10,4.12: statement "enum" should have a "description” substatement
>
> 2. This is a follow-up to the discussion on the mailing list. Reading through this draft, RFC7950, RFC6020, and rfc7895bis, it is not clear if a NETCONF server that wants to support both YANG 1.0 and YANG 1.1, needs to do from a schema advertisement perspective. Does it advertise the schemas as part of <hello> and as part of yang-library:1.1? Does it advertise both YANG 1.0 and 1.1 models in both the modes?
It is the specific modules that are being supported that are YANG 
1.0/YANG 1.1 rather than the NETCONF server generically.

So, I think that this is really a variant of the broader question: Can a 
device implement multiple revisions of a YANG module?  This seems like a 
question that may be appropriate to be considered by the YANG versioning DT.

But my recollection of the current RFCs (and YANG library bis draft) is 
that a standards compliant server only advertises a single revision of a 
module, and hence supporting multiple revisions is beyond the scope of 
the current standards documents.

Thanks,
Rob

>
>
> Mahesh Jethanandani // as shepherd
>
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