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The Implications...
This is fine; the spaces have different purposes
However, movements between spaces are complicated:
It may be hard to adopt a VSA as an IETF attribute, even if we wanted to, if there is a type difference
Question: what types do VSAs use?
A definition of an attribute in Diameter can not be used in RADIUS, two different attributes lead to translation difficulties
Only designed movement is RADIUS attribute => Diameter VSA
Some people argue that current type system is too limiting
Attribute number availability may be a problem too
PPT Version