IBM Enterprise Extender (EE) is a standard internet transport protocol for IBM Systems Network Architecture (SNA) High Performance Routing traffic over IP.
Enterprise Extender is analogous to, but independent of, Transmission Control Protocol (TCP).
[1] Enterprise extender was developed by the Internet Engineering Task Force and the APPN Implementers' Workshop, and standardized in 1997 in Internet RFC 2352.
[2] Enterprise Extender traffic is transmitted as UDP datagrams.
It is integrated with Systems Network Architecture in z/OS systems, and implemented in software, such as IBM Personal Communications of Windows (PCOM), or hardware such as Cisco routers with the SNA Switching Services feature (SNASw), in remote systems.