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Re: Transaction support in Netconf
On Wed, Nov 16, 2005 at 10:17:42AM +0100, Balazs Lengyel wrote:
> Why do you think using a candidate configuration is better then edit-config
> ?
> pro for using candidate:
> - It is difficult to assemple big edit config commands
> con:
> - the managed node needs to keep a complete candidate configuration or
> calculate a delta between the running and the candidate, which might be
> quite an effort
If you modify the candidate configuration in multiple netconf
operations, you can get early feedback if you try to do something
that won't work. I believe this is useful.
Smart implementations may want to try to find a least disruptive
transition from the current running configuration to the desired new
configuration. So calculating the delta on the device might actually
be a feature as this decouples the transition logic from the manager's
instruction how to change the configuration. In other words, even if
you ship a large edit config, it might internally make sense to create
a temporary candidate configuration which is then committed (and you
then calculate a least disruptive transition plan).
But note that I am talking "theory" here since I have not written my
own netconf implementation. But if I were to do it, I would try to do
things as outlined above. Perhaps others who have been working on
implementations can say how they actually deal with this.
> PS. If I have other questions shall I keep posting them to the
> newsgroup or only to you?
Personally, I think this mailing list is a good place as long as you
have generic questions related to netconf that are potentially of
interest to others as well. This list does not suffer from too much
traffic as far as I can tell. But at the end, the chairs must decide
which traffic is appropriate here on the list and I know that IETF
WGs have different policies when it comes to the discussion of
implementation details.
/js
--
Juergen Schoenwaelder International University Bremen
<http://www.eecs.iu-bremen.de/> P.O. Box 750 561, 28725 Bremen, Germany
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