AW: subtypes (was: HTTP digest and RADIUS; new version of the Ste rman draft)

["Beck01, Wolfgang" <BeckW@t-systems.com>]

John Loughney wrote:
> This is exactly why we need to ensure interoperability.  If we extend RADIUS in
> ways which would require RADIUS servers to be recoded, what is gained? 
Vendors keep adding minor extensions and fixes to their products all the time.
We have processes for sytem updates. Replacing a AAA platform is a different 
category.

> I think that if Extension X provides the exact same functionality as VSA y,
> what is the need to support Extension X?
If VSA is identical to Extension X, you are right. But what if VSA y does not
care about DIAMETER interopability and Extension X does? When I submitted
draft-sterman-aaa-sip, one of the first question was about DIAMETER
interopability. There was a problem that could be settled after some
discussion. In this particular case, we found that a change in the
DIAMETER SIP application draft was the best solution. With a VSA, this 
valuable discussion wouldn't have happened.

Wolfgang


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