Re: [YANG] mandatory & default

Juergen Schoenwaelder píše v Po 28. 01. 2008 v 09:46 +0100:
> On Sun, Jan 27, 2008 at 08:54:51PM -0800, Randy Presuhn wrote:
>  
> > If I'm archiving a configuration, I want to know *exactly*
> > what it is.  One of the reasons for archiving configurations
> > is so that if a box fails, a replacement can be quickly made
> > to function in its place.   If there is even a remote chance
> > that a default value might change between releases or on
> > different versions of a hardware platform, that value needs
> > to be included in an archive of the configuration.
> 
> If your replacement is using the exact same hardware configuration and
> the exact same firmware version, you do not need to worry about the
> defaults.
> 
> If your replacement is not using the exact same hardware configuration
> and the exact same firmware version, there is a chance that things
> won't work as expected, with and without saved defaults.
> 
> If things fail, you need to have a human to figure out what is the

Here is the problem with changed defaults: things will not fail, they
will just work differently from what you expect.

Lada

> configuration and what is saved default noise. So the bottom line of
> my thinking is that you like to have both - the explicitly set config
> and the full configuration state including the defaults. Only if you
> have both, you can reasonably debug configuration playback errors on
> replacement hardware.
> 
> /js
> 
-- 
Ladislav Lhotka, CESNET
PGP Key ID: E74E8C0C

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