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4. Where do I find more information about RADIUS?

Radius is in the IETF standardization process. As of 1998-04-01, it is a proposed standard which is available as RFC2138 (RADIUS core protocol) and RFC2139 (RADIUS accounting).

Cisco enhanced RADIUS where the plain protocol does not provide all the features supported by TACACS+. Unlike other vendors, they did so solely by using the vendor-specific attribute, in compliance with the radius specification. In newer IOS releases they also support some of the Ascend-specific attributes.


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