HP-UX SNAplus2 R7 Administration Guide

Appendix DUsing SNAplus2 in a High Availability Environment

Figure D–9 SNAplus2 Server Running TNServer

TN3270

3xxx

Communications

Controller

IBM

Host

LAN

S800

Server

TN Server LAN

Client

connection

Since TN3270 and TN Server communicate over a telnet (TCP/IP) connection, this connection can be maintained

during a local LAN failover or can be quickly reestablished when the package is migrated to another server. The

only requirement is that you specify the ﬂoating IP address associated with the SNAplus2 package, or a name that

can be mapped to that IP address by TN3270 (using whatever method is available on the TN3270 client system).

Using the LAN to Access Standalone Servers

When SNAplus2 is used in a standalone conﬁguration, the LAN can still be used to access the server system.

Although you do not run applications on SNAplus2 client systems, you access the applications running on the

server from another computer system via the LAN. For example, you might use telnet or rlogin to log in from a

desktop workstation to an SNAplus2 server to run the SNAplus2 application. Like the TN Server example above,

these TCP/IP connections will be maintained during a local LAN failover or during a remote failover if you access

the server using the ﬂoating IP address associated with the SNAplus2 package.

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