Re: [netmod] augment and if-feature

Phil Shafer <phil@juniper.net> Tue, 14 March 2017 20:15 UTC

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To: Martin Bjorklund <mbj@tail-f.com>
CC: joey.boyd@adtran.com, netmod@ietf.org
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Date: Tue, 14 Mar 2017 16:11:09 -0400
From: Phil Shafer <phil@juniper.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/rajwUbDnE3zOEezkYpjbT0izAq8>
Subject: Re: [netmod] augment and if-feature
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Martin Bjorklund writes:
>> What are your thoughts on this? Surely, an augment should not have to
>> contain if-feature statements of all parents of the augmented node.
>
>The spec says:
>
>   When a server implements a module containing an "augment" statement,
>   that implies that the server's implementation of the augmented module
>   contains the additional nodes.
>
>Compare with a simple augment of a node w/o an if-feature.  In this
>case, if the server implements the augmenting module, it MUST also
>implement the augmented module.

It implements the module, but it doesn't implement the nodes
since it doesn't express the feature.  IMHO this is a tool
bug and/or an errata, since otherwise one has to carry features
forward, repeating the if-feature using the original modules
prefix:feature-name on every augment of feature-based nodes.

Thanks,
 Phil