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Re: [netmod] Interaction of 'when' and 'default' statements

Martin Bjorklund <mbj@tail-f.com> Wed, 22 March 2017 17:52 UTC

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Date: Wed, 22 Mar 2017 18:52:42 +0100
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To: wivory@Brocade.com
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From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] Interaction of 'when' and 'default' statements
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William Ivory <wivory@Brocade.com> wrote:
> Hi,
> 
> I'm looking for clarification of the 'when' and 'default' statements
> on a leaf.  For example, if a leaf has a 'default', can it also have a
> 'when' statement that could cause it to disappear if the 'when'
> condition evaluates to false?

Yes, and in that case the default doesn't apply.

> Section 8.3 or RFC 6020 isn't clear on
> how evaluation of constraints should be done here, and neither the
> section on the 'when' statement nor the 'default' section have any
> cross-references.

If the "when" expression evaluates to false, it's like if the whole
node doesn't exist.  A client can't set it etc.


/martin

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