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The HA interface can only be set when the unit is in the HA unconnected mode, and both units must be
set to the same interface.
3
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.
4
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).
5
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.
6
In the Primary Serial Number field, type in the serial number of the primary device. The maximum
length is 12 characters.
7
In the Backup Serial Number field, type in the serial number of the backup device. The maximum
length is 12 characters.
8
Click Accept.
9
In the browser, open a new tab and point it to the IP address of the backup unit. Log in to the backup.
10 Repeat 1 through 8 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.
Dell SonicWALL Secure Mobile Access 8.5
Administration Guide
332
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