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

HP-UX

System A

HP-UX

System B

X.25 Switch

(Hunt Group

Facility

supported)

X.25 Network

To Remote X.25 System

X.25 PSI Adapter

Serial Line A

Serial Line B

X.25 HA Cluster

Figure 7. X.25 / PSI Remote Failover setup

Legends

Primary

Standby

In the above X.25/PSI HA setup, the Serial Line A and Serial Line B is configured in the same Hunt

group. Once the PSI adapter on the system A (primary node) fails, the Serviceguard package

migrates the X.25/PSI interface to the PSI adapter on the system B (standby node). All the

incoming calls from the Remote X.25 system are directed to the adapter in system B instead of the

adapter in system A.

For more details on Configuring X.25 ServiceGuard package, see the section Configuring the High

Availability Feature of HP X.25/9000 User’s guide available at:

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

HA Migration Summary

According to the above two HA summaries for X.25/ACC and X.25/PSI, following important

points need to be kept in mind before going forward with this migration: -

• X.25/ACC requires an extra hardware, Dual interface panel, to achieve the high

availability, and X.25/PSI does not need any extra hardware. Systems that have X.25/PSI

interface need to be connected to a switch that support Hunt Group facility and the user

should be subscribed to it to achieve HA feature.

• The number of systems configured in the HA Serviceguard cluster is transparent to the X.25

switch in case of X.25/ACC HA setup due to the Dual interface panel present between the

ACC adapter and the switch. In case of X.25/PSI HA setup, the X.25 switch detects the

number of systems configured in the HA ServiceGuard cluster, because an X.25 PSI

adapter from each system is connected to the different serial ports present in the switch.