History
The Diameter protocol was initially developed by Pat R. Calhoun, Glen Zorn, and Ping Pan in 1998 to provide an Authentication, Authorization, and Accounting (AAA) framework that could overcome the limitations of RADIUS. RADIUS had issues with reliability, scalability, security and flexibility. RADIUS cannot effectively deal well with remote access, IP mobility, and policy control. The Diameter protocol defines a policy protocol used by clients to perform Policy, AAA, and Resource Control. This allows a single server to handle policies for many services.
Like RADIUS, Diameter provides AAA functionality but in addition it is made more reliable by using TCP and SCTP instead of UDP. The Diameter protocol is further enhanced by the development of the 3rd Generation Partnership Project (3GPP) IP Multimedia Subsystem (IMS). The Cx, Dh, Dx, Rf, Ro, and Sh interfaces are supported by Diameter applications. Through the use of extensions, the protocol was designed to be extensible to support Proxies, Brokers, Strong Security, Mobile-IP, Network Access Servers (NASREQ), Accounting, and Resource Management.
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