[netmod] Use feature to advertise pre-nmda-support {was: WG Last Call: draft-ietf-netmod-rfc7223bis-00 ]

Balazs Lengyel <balazs.lengyel@ericsson.com> Fri, 01 December 2017 11:37 UTC

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To: Kent Watsen <kwatsen@juniper.net>, "netmod@ietf.org" <netmod@ietf.org>
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From: Balazs Lengyel <balazs.lengyel@ericsson.com>
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Subject: [netmod] Use feature to advertise pre-nmda-support {was: WG Last Call: draft-ietf-netmod-rfc7223bis-00 ]
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Hello,

https://tools.ietf.org/html/rfc7950#section-7.21.2" rel="nofollow">https://tools.ietf.org/html/rfc7950#section-7.21.2

   o  "deprecated" indicates an obsolete definition, but it permits
      new/continued implementation in order to foster interoperability
      with older/existing implementations.

This means that a node that is deprecated MAY or MAY NOT be implemented.
YANG is considered an interface contract,  however "maybe implemented" is unusable in a contract.
YANG already has a statement defined for indicating such optional support: the feature statement.
Deprecated works as if there would be an if-feature statement on each deprecated schema node
where the server does not advertise whether the feature is supported of not. Why is it not advertised?

I would like to propose to use a feature here. This would allow the client to understand if the container interfaces-state is implemented or not. 

module ietf-interfaces {
   feature pre-nmda-support {
       description "The feature indicates that 
          schema parts representing state information 
          are deprecated but are still implemented."
   }

   container interfaces {...}

   container interfaces-state {
      if-feature pre-nmda-support ;
      status deprecated;
      ...
 }
}

regards Balazs


On 2017-11-28 20:29, Kent Watsen wrote:
All,

This starts a two-week working group last call on
draft-ietf-netmod-rfc7223bis-00.

Please recall that this update's intention is to 
modify the YANG module to be in line with the NMDA
guidelines [1].  Reviewing the diff between the two
drafts [2] should reveal just this.

The working group last call ends on December 12.
Please send your comments to the netmod mailing list.

Positive comments, e.g., "I've reviewed this document
and believe it is ready for publication", are welcome!
This is useful and important, even from authors.

[1] https://tools.ietf.org/html/draft-dsdt-nmda-guidelines-01" rel="nofollow">https://tools.ietf.org/html/draft-dsdt-nmda-guidelines-01
[2] https://tools.ietf.org/rfcdiff?url2=draft-ietf-netmod-rfc7223bis-00.txt" rel="nofollow">https://tools.ietf.org/rfcdiff?url2=draft-ietf-netmod-rfc7223bis-00.txt

Thank you,
Netmod Chairs


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