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Re: [Netconf] Is there a problem with confirmed commits?

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Mon, 14 January 2019 22:32 UTC

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Date: Mon, 14 Jan 2019 23:32:21 +0100
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: jonathan@hansfords.net
CC: 'Andy Bierman' <andy@yumaworks.com>, netconf@ietf.org
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Subject: Re: [Netconf] Is there a problem with confirmed commits?
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On Mon, Jan 14, 2019 at 08:07:26PM -0000, jonathan@hansfords.net wrote:
> 
> Just as a footnote, if the cause of the session termination was the device rebooting and the :startup capability was supported, the <running> configuration datastore will contain whatever was in the <startup> configuration datastore. However, a confirming commit on a persistent confirmed commit would still commit the <candidate> configuration datastore to <running>. If the purpose of the confirmed commit was to test the new configuration prior to making it permanent, it would therefore make sense to copy the <candidate> configuration datastore to the <startup> configuration datastore prior to the confirmed commit.
>

My understanding of a confirmed commit is:

    copy condidate to running and wait for a confirmation that
    everything is OK; if no confirmation is received within a certain
    time window, rollback to the original state of <running>.

The situation you describe is a bit unclear for me; when does the
device reboot, after the confirmed commit has been issued but before
<candidate> was copied to <running>? That would be a rare situation
and I have some doubts that implementations after the reboot would
start the confirmed commit or they would not execute a reboot before
copying <candidate> to <running>.

/js

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

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