Re: [Netconf] [netmod] NETCONF NMDA <get-data> on conventional datastore

Martin Bjorklund <mbj@tail-f.com> Tue, 05 June 2018 09:40 UTC

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Date: Tue, 05 Jun 2018 11:40:21 +0200 (CEST)
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To: rohitrranade@huawei.com
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From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [Netconf] [netmod] NETCONF NMDA <get-data> on conventional datastore
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Rohit R Ranade <rohitrranade@huawei.com> wrote:
> Hi All,
> 
> RFC 8342 defines the conventional data-store as below
> 
> "
>      identity conventional {
>        base datastore;
>        description
>          "Abstract base identity for conventional configuration
>           datastores.";
>      }
> "
> 
> So when using the data-store-ref with NETCONF <get-data> as below:
> 
> <rpc message-id="101"
>         xmlns="urn:ietf:params:xml:ns:netconf:base:1.0">
>      <get-data
>              xmlns="urn:ietf:params:xml:ns:yang:ietf-netconf-nmda"
>              xmlns:ds="urn:ietf:params:xml:ns:yang:ietf-datastores">
>        <datastore>ds:conventional</datastore>
>     </get-data>
> </rpc>
> 
> The libyang parser was successfully able to parse this as a valid
> data-store-ref. But conceptually this is not a valid data-store as
> it is an "abstract base identity". 
> NETCONF Server will have to add code to send error when conventional
> data-store comes in input.  I would prefer if we can control this
> using data-model statements then the parser can handle the
> error. Any thoughts ?

I agree.  This would be a useful enhancement to YANG.

FWIW, we have implemented such a vendor-specific extension
(tailf:abstract).

It is also listed on the tracker for future ideas:

https://github.com/netmod-wg/yang-next/issues/33


/martin