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Re: [YANG] default values

Ladislav Lhotka <lhotka@cesnet.cz> Thu, 17 January 2008 16:57 UTC

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Subject: Re: [YANG] default values
From: Ladislav Lhotka <lhotka@cesnet.cz>
To: Andy Bierman <ietf@andybierman.com>
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Date: Thu, 17 Jan 2008 17:57:09 +0100
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Andy Bierman píše v Čt 17. 01. 2008 v 07:42 -0800:
> I strongly object to removing the default-stmt.
> As Balazs pointed out, if a WG does not agree on a suitable
> default value, they do not have to define one.  This clause
> is needed to support NETCONF, not only to provide as much
> machine-readable info about the data model characteristics,
> but to simplify NETCONF tasks for operators and applications.

Operators should only be concerned with the defaults used by their front
ends - and these would typically include much more than just the MUST
defaults that YANG can handle.

> 
> There are likely to be many knobs in a real config file that are optional
> and have suitable agent-supplied default values.  It is very useful

How many of them could possibly be of the MUST sort? I don't know many.
The default is a weak concept, it's not like a fixed constant.

Lada

-- 
Ladislav Lhotka, CESNET
PGP Key ID: E74E8C0C



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