TACACS+TACACS has several different versions. The industry-standard version of TACACS is specified by RFC 1492. XTACACS is a Cisco proprietary version. Cisco added some enhancements to the RFC 1492 TACACS version and XTACACS was born. Finally, the current version of TACACS supported on Cisco equipment is TACACS+. This version was developed by Cisco and is not compatible with other versions of TACACS.
Features of TACACS+TACACS+ is more widely used than RADIUS; however, both protocols have similar functionality. Some of the benefits of using TACACS+ are that the protocol uses TCP as its transport protocol and TACACS+ provides multiprotocol support. TACACS+ separates the functionality of AAA services into separate services. Therefore, there is a TACACS+ service that handles authentication, a TACACS+ service that handles authorization, and a separate service for accounting. However, the accounting services are limited, especially when compared to those of RADIUS.
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