ok - after you edited your original question, it makes a bit more sense to me.
You are right - if you look into the ISE RADIUS Dictionary, you will see a lot of vendor attributes - and there is no manual/doc that comes with it. At best, the dictionary tells you the data type (e.g. integer or string etc.) - but that's it.
As a RADIUS engineer you need to know what attributes your NAD devices support/need to get the job done. That usually involves reading vendor documentation.
For the most part, we tend to use the same attributes for MAB and DOT1X (e.g. Calling-Station-ID and Service-Type etc.)
I tend to search the web for these sorts of things. And there are RFCs - classic one is RFC2865 and RFC2866. And newer ones too.
