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Re: [Rtg-yang-coord] YANG leaf writing to running-datastore

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Tue, 03 March 2015 00:20 UTC

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Date: Tue, 3 Mar 2015 01:19:57 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: Mahesh Jethanandani <mjethanandani@gmail.com>
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Subject: Re: [Rtg-yang-coord] YANG leaf writing to running-datastore
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On Mon, Mar 02, 2015 at 10:42:55PM +0000, Mahesh Jethanandani wrote:
> Is there a way to restrict having a leaf be written to running datastore
> only? In other words, the leaf should never be written to startup
> datastore. Along the lines of an ephemeral datastore, except in this case
> it is a configuration parameter, and not something the device has learnt.
> 
> The particular case that comes to mind is putting an ethernet port in
> loopback mode. This is done mainly to put the port in a debug mode, and is
> meant to be temporary. But under no circumstance should it ever be written
> to a saved datastore in a way that the port comes up in loopback mode.
> 
> If there is no such capability today, can we consider adding it?

There is no such capability today.

Ephemeral datastores were discussed last year. An ephemeral datastore
would most likely provides the functionality you are looking for but I
am not sure this idea is actively pushed forward by anyone at this
point in time.

The closest you have today is a device that supports an explicit
startup datastore. After copying changes to <startup>, you can modify
<running> and the changes will not persist until to copy <running>
back to <startup>. But of course, this is brittle if there are
multiple changes and some should persist but others not. This is what
let to the notion of ephemeral datastores.

/js

-- 
Juergen Schoenwaelder           Jacobs University Bremen gGmbH
Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
Fax:   +49 421 200 3103         <http://www.jacobs-university.de/>

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