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ACTIVE/STANDBY ROLE IN HA
Automatic Failure Detection
Figure 13: Active and Standby UCM Failover
Active UCM: Self-Failure Detection
The active UCM monitors and regularly checks whether there is any failure on itself. When there is failure
detected on itself, it will notify the standby UCM to take over as active server. Then the original active UCM
will reboot automatically and become the standby server. This scenario applies to active UCM which has
part of the function or specific service in faulty status, and it can still work partially without shutting down
the service completely.
For example, if the active server has a core dump generated for a core service, FXO port failure or
WAN/LAN port disconnection, with this detection and notification mechanism, the standby UCM can take
over immediately without noticeable delay or service interruption.
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