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374 Appendix D
Using SNAplus2 in a High Availability Environment
Using SNAplus2 with MC/ServiceGuard
TN Server LAN Connections
One application that can take advantage of both local LAN failover and
floating IP addresses in an SNAplus2 network is TN3270. When you run
TN3270, you specify a particular IP address to contact. When an
SNAplus2 server is running the TN Server component, the IP address
you specified can be the IP address of the SNAplus2 package.
Figure D-9 SNAplus2 Server Running TNServer
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).
TN3270
3xxx
Communications
Controller
IBM
Host
LAN
S800
Server
TN Server LAN
Client
connection