Automatic Switchovers
Automatic switchovers are triggered without immediate intervention on your part. Oracle® Enterprise Session Border Controller s switch over automatically in the following circumstances:
- When the active Oracle® Enterprise Session Border Controller ’s health score of drops below the threshold you configure.
- When a time-out occurs, meaning that the active
Oracle® Enterprise Session Border Controller has not has not sent checkpointing messages to the standby
Oracle® Enterprise Session Border Controller within the allotted time.
The active Oracle® Enterprise Session Border Controller might not send checkpointing messages for various reasons such as link failure, communication loss, or advertisement loss. Even if the active Oracle® Enterprise Session Border Controller has a perfect health score, it will give up the active role if it does not send a checkpoint message or otherwise advertise its status within the time-out window. Then the standby Oracle® Enterprise Session Border Controller takes over as the active system.
When an automatic switchover happens, the Oracle® Enterprise Session Border Controller that has just become active sends an ARP message to the switch. This message informs the switch to send future messages to its MAC address. The Oracle® Enterprise Session Border Controller that has just become standby ignores any messages sent to it.