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4
Select the High Availability Interface from the drop-down list. The HA interface can only be set when
the unit is in the HA unconnected mode, and the interface must be set to the same interface on both
units.
5
Enter a number of milliseconds for the Heartbeat Interval. The heartbeat is used to test the
connectivity between the primary and backup devices. The heartbeat interval controls how often the
two units communicate. The minimum is 500 milliseconds (a half second), and the maximum is 300,000
milliseconds (five minutes).
6
Enter a value for the Failover Trigger Level. This is the number of heartbeats that must be missed
before failover occurs. The minimum is four, and the maximum is 99.
7
Click Accept.
8
In the browser, open a new tab and point it to the IP address of the backup unit. Log in to the backup.
9
Configure High Availability on the backup unit.
When you click Accept, the backup device becomes IDLE and you are no longer able to access it with its
IP address. The primary device is now Active with the same settings it had before the HA configuration.
The appliances in the HA Pair immediately begin to synchronize data from the primary to the backup
unit. When failover occurs and the primary is down, the backup unit becomes Active with the same
settings as the primary.
Enabling Interface Monitoring
In the Interface Monitoring section of the page, you can enable monitoring of the working interfaces to which
VPN users connect.
The monitored interfaces available for selection are X0, X1, and X2. When Interface Monitoring is enabled and
configured, if any of the monitored interfaces loses connectivity on the active unit and is still reachable on the
idle unit, failover occurs.
To enable interface monitoring:
1
On the High Availability > Settings page under Interface Monitoring, select Enable Interface Monitor.
2
In the Monitor Interfaces list, select the interfaces that you want to monitor.
3
Click Accept.
Dell SonicWALL Secure Mobile Access 8.5
Administration Guide
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