RADIUS and TACACS+
The Cisco Secure ACS supports two remote access protocols, the RADIUS protocol and the TACACS+ protocol. TACACS has three variations, all of which are supported by Cisco IOS:
TACACS— TACACS is the original protocol that Cisco developed in response to RADIUS. It is incompatible with TACACS+ and has a lot of its own commands that are supported on Cisco IOS. It provides password checking, authentication, and basic accounting functions.
Extended TACACS (XTACACS)— XTACACS is an extension to the original TACACS protocol. This adds functionality to the TACACS protocol by introducing features such as more complex authentication and accounting methods.
TACACS+— TACACS+ is the most recent of the TACACS protocols. This protocol is not compatible ...
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