Re: [netmod] An abundant amount of IANA if types...

Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> Fri, 06 April 2018 11:36 UTC

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Date: Fri, 6 Apr 2018 13:36:39 +0200
From: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>
To: "Bogaert, Bart (Nokia - BE/Antwerp)" <bart.bogaert@nokia.com>, Alex Campbell <Alex.Campbell@Aviatnet.com>, "netmod@ietf.org" <netmod@ietf.org>
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Subject: Re: [netmod] An abundant amount of IANA if types...
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On Fri, Apr 06, 2018 at 10:51:48AM +0200, Ladislav Lhotka wrote:
> Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de> writes:
> 
> > If we would have a mechanism to deviate an identityref to a subset of
> > identity values supported by an implementation, we would have solved a
> > more generic problem. Yes, the IANA list could be 'nicer' but it will
> > never be 'nice'.
> 
> Three mechanisms can be used for this:
> 
> - splitting the identities into separate modules

Whatever module organization you come up with, it won't work for all
implementations. 

> - using features

Making every identity a feature will turn the feature system upside
down. This is similar to making every leaf a feature.

> - using deviations (even though vendors frown on them)

If my implementation only supports A and B and C, then a deviation may
state exactly that and the problem is solved. Hoping that my specific
combination of A and B and C matches a set of modules or some set of
features is in my view an illusion.

Vendors not shipping proper deviations are essentially telling their
customers that they have not yet understood model driven management.
We need to change the mindset here instead of polluting our data
models with hundreds or thousands of fine grained 'features'.

/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/>