Advanced Peer-to-Peer Networking

Advanced Peer-to-Peer Networking® (APPN) is one type of data communications support that is provided by the iSeries™ system. This support routes data in a network between two or more advanced program-to-program systems. The systems do not need to be directly connected in the same network or adjacent networks.

The APPC/APPN support handles all of the SNA protocol requirements when your system is communicating with a remote system that uses the logical unit (LU) session type 6.2 and node type 2.1 architectures. The remote system can be any of the following systems:

• iSeries system
• System/36™
• System/38™
• IBM® personal computer
• Displaywriter
• Series/1
• 5520 Administrative System
• RISC System/600 (Reduced Instruction Set Computer)
• DPPX/370 (Distribute Processing Programming Executive
• One of the following host systems:
  • System/370™
  • System/390®
  • 30XX processor
  • 43XX processor
  • 9370 system
  • Another system that supports the appropriate level of architecture

The iSeries APPN support is an enhancement to the SNA Node Type 2.1 architecture that supplies networking functions. These enhancements are easy-to-use, are dynamic; and give control of the network to the peer systems that make up the network. APPN provides you with the following advanced functions:

• Distributed directory services
• Dynamic route selection that is based on user-specified values
• Intermediate session routing
• Routing of data by using transmission priorities.

With the exception of intermediate session routing, HPR builds on and uses these APPN functions. For more information on HPR, see high-performance routing.