Hello Juergen,

I have also noticed this but when I look at the type of remarks Andy is
making I get an impression that "dust has not settled" on how this will work
in "real life".

Regards, Bart
-----Original Message-----
From: Juergen Schoenwaelder [mailto:j.schoenwael...@jacobs-university.de] 
Sent: Saturday, August 05, 2017 10:36 AM
To: Bogaert, Bart (Nokia - BE/Antwerp) <bart.boga...@nokia.com>
Cc: Andy Bierman <a...@yumaworks.com>; netmod@ietf.org
Subject: Re: [netmod] Questions on NMDA and "merged config and state"

On Fri, Aug 04, 2017 at 07:03:43AM +0000, Bogaert, Bart (Nokia - BE/Antwerp)
> Maybe a stupid question from my side (I'm not involved  in the NMDA 
> work) but is there some kind of consensus on what is proposed in this 
> draft RFC or are we miles away from such a consensus?  Since this is 
> linked to how a server has to handle state in the proposed merging of 
> config and state under one branch of the tree coming to a conclusion 
> to me seems a requirement since in the current implementation we just 
> can't change a CT leaf in the running DS by a value that is 
> dynamically learned; in the NMDA approach that would be possible as 
> the operational DS contains both CT and CF leaves and consequently a 
> value as configured by the client can be overwritten by a dynamically 
> learned value as the value configured by the client remains untouched 
> in the running DS.  In the current implementation we would need to 
> model a CF leaf for this purpose.  At least that is how I have always 
> understood how it should be done.  As long as we do not have 
> NDMA-based server implementations we can't design and implement YANG
models as proposed in NMDA and its associated guidelines.


you may want to look at draft-dsdt-nmda-guidelines-01. Protocol updates to
support NMDA are on the way as well, draft-dsdt-nmda-netconf-00 and


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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