RE: backwards compatible introduction of NEW attribute such as CUI

["Nelson, David" <dnelson@enterasys.com>]

A postscript ...

> In the absence of any RFC that
> includes the Error-Cause attribute in an "attribute usage table" that
> includes the traditional RADIUS Access-* commands, such usage is
> speculative, and non-standardized.

RFC3580 (also Informative) does indicate that the Error-Cause attribute
may appear in RADIUS messages used for 802.1X authentication and
authorization, without further describing how it is to be used.  It
apparently leaves the definition in RFC3576 unmodified.  This may be a
"foot in the door"...



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