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382 Appendix D
Using SNAplus2 in a High Availability Environment
Advanced Configuration Techniques
Advanced Configuration Techniques
The following advanced configuration techniques are useful in networks
where there are multiple DLC (Data Link Control) types connecting one
or more HP 9000 server s to the remote SNA system. For example, a
standalone server might use a Token Ring LAN to communicate with the
remote system, but have an SDLC DLC ready to use if the token ring is
unavailable.
Figure D-14 Standalone Server using Token Ring Primary DLC and SDLC
Backup DLC
The idea is that when SNA networking problems occur, simply switching
to a different link type on the same HP 9000 server often restores
network connectivity without having to perform a remote failover.
Previously, we discussed how to use snapmon as a Service in the
Package Control Script to monitor an SNAplus2 LS and inform
ServiceGuard of a failure. In the following sections we will explain how
3xxx
Communications
Controller
IBM
Host
HP 9000
Server
Backup DLC
Primary DLC
SDLC
Token
Ring LAN