Migrating X.25 over ACC to X.25 over PSI

For more information on configuring X.25/PSI, see HP X.25/9000 User’s Guide available at:

http://docs.hp.com/en/netcom.html#X.25

HA Migration

X.25/ACC HA Summary

The MC ServiceGuard product (B3936AA) uses a user defined X.25/ACC monitor script to

monitor the service in the control package. The monitor script is designed to terminate if there is a

fatal error (Uses a ‘heartbeat mechanism’ to detect failures on the host or the firmware and

individual port control through ZCOM APIs), and the termination will cause ServiceGuard to move

the service to the standby system.

The ports of standby node must be configured in tri-state (LOOPBACK) mode. The objective is to get

the stand by system into a running state as quickly as possible when the primary system fails for

any reason. The multi port adapters on the backup system are reconfigured by Serviceguard to take

them out of tri-state mode so that the adapter can be used for normal X.25 communications.

When Serviceguard brings up the stand by system as active after the primary systems fails,

Serviceguard scripts re-enable the X.25 link and VCs and put the links back to the operational

state. Having the same X.25 addresses in both active and standby system configuration files helps

this move transparent to the X.25 switch and the traffic can resume from the peer system.

Figure 6 shows the HA system configuration for an ACC setup in Service Guard environment.

HP-UX

System A

HP-UX

System B

X.25 Switch

X.25 Network

To Remote X.25 System

ACC Multi port Adapter

ACC HA Cluster

Figure 6. ACC High Available system configuration

Legends

Primary

Standby

Dual Interface

Panel