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

William Ivory <wivory@Brocade.com> Wed, 22 March 2017 17:56 UTC

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From: William Ivory <wivory@Brocade.com>
To: Martin Bjorklund <mbj@tail-f.com>
CC: "netmod@ietf.org" <netmod@ietf.org>, Nick Brown <brownn@Brocade.com>
Thread-Topic: [netmod] Interaction of 'when' and 'default' statements
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Date: Wed, 22 Mar 2017 17:55:31 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/netmod/KpEa5ZpgFouGO69yDhjrpf9NNYk>
Subject: Re: [netmod] Interaction of 'when' and 'default' statements
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Hi Martin,

Thanks.  Can you point me at the part of RFC 6020 that explicitly states that 'when' wins over 'default'?

William

-----Original Message-----
From: Martin Bjorklund [mailto:mbj@tail-f.com] 
Sent: 22 March 2017 17:53
To: William Ivory <wivory@Brocade.com>
Cc: netmod@ietf.org; Nick Brown <brownn@Brocade.com>
Subject: Re: [netmod] Interaction of 'when' and 'default' statements

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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