HP UX SNAplus2 DLC, Advanced Configuration Techniques, Figure D-14Standalone Server using Token Ring Primary DLC and SDLC Backup DLC

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

	HP 9000
	Server
Primary DLC	Backup DLC
	Token

Ring LAN SDLC

3xxx

Communications

Controller

IBM

Host

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

382 Appendix D