HP-UX SNAplus2 R7 Administration Guide

Introduction to SNAplus2
SNAplus2 Components
Figure 2–8 TN Server
TCP/IP Network
Host
SNA Node
Running TN Server
Clients Running TN3270
and TN3270E Programs
SNA Nodes Running
3270 Emulators
SNA Node
TN Server Configuration TN3270 Program View
of the Configuration
TCP/IP Network
Host
Clients Running TN3270
and TN3270E Programs
Host
Host View of the Configuration
The SNAplus2 TN server feature provides an association between a TN3270 user and SNAplus2 3270 LU. All data
from the TN3270 user is routed to the LU. This means that the configuration for both the host and the TN3270 user
is as though they were connected directly; neither needs to be aware that data is being routed through TN server.
When a TN3270 program communicates with TN server, SNAplus2 identifies the program by the TCP/IP address of
the computer where the TN3270 program is running. SNAplus2 cannot distinguish between two different TN3270
programs being used by different users on the same computer. In the SNAplus2 manuals, the term TN server user
refers to the computer where a TN3270 program is running, not to an individual user of that program.
Each TN server user is normally configured to access a single 3270 LU, and so is restricted to one host session at
a time. However, you can also configure a TN server user to access a pool of 3270 LUs, instead of having a single
dedicated 3270 LU for each user. This enables the user to access as many sessions as there are available LUs in
the pool.
Enterprise Extender (HPR/IP)
Enterprise Extender (HPR/IP) provides a mechanism for integrating SNA applications with an IP network.
SNA applications are designed to use SNA protocols to communicate over SNA networks with other SNA
applications. When installed in a TCP/IP network using Enterprise Extender, SNA applications can still
communicate; the Enterprise Extender function provides a mechanism for transporting SNA protocols over the
IP network. In particular, it provides APPN High-Performance Routing (HPR) functionality, giving the applications
the benefits of both APPN and IP connectivity.
Enterprise Extender in SNAplus2 is implemented simply as a communications link. To connect two SNA applications
over IP, you define an Enterprise Extender link, in the same way as for any other link type such as SDLC or Ethernet.
2.3.2 User Applications
SNAplus2 supports the following user applications:
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