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Chapter 9. Networking concepts

If you would like more information on networking topics, review the following:
v Advanced Peer-to-Peer Networking support

v Advanced Program-to-Program Communications

v Dependent LU Requester Support (DLUR)

v High-performance routing (HPR)

v Internet packet exchange support

v Systems Network Architecture

v TCP/IP

Advanced Peer-to-Peer Networking

Advanced Peer-to-Peer Networking (APPN) is one type of data communications support that is provided
by the AS/400 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 LU session type 6.2 and node type 2.1 architectures.
The remote system can be any of the following systems:
v AS/400 system

v System/36

v System/38

v IBM personal computer

v Displaywriter

v Series/1

v 5520 Administrative System

v RISC System/600 (Reduced Instruction Set Computer)

v DPPX/370 (Distribute Processing Programming Executive

v 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 AS/400 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:
v Distributed directory services

v Dynamic route selection that is based on user-specified values

v Intermediate session routing

v 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.