Dell NSA E8500 Getting Started Manual page 41

Log into the secondary Dell SonicWALL's unique LAN IP
address. The management interface should now display
Logged Into: Backup SonicWALL Status: Active in the
upper-right-hand corner.
Now, power the primary appliance back on, wait a few minutes,
then log back into the management interface. If stateful
synchronization is enabled (automatically disabling preempt
mode), the management GUI should still display Logged Into:
Backup SonicWALL Status: Active in the upper-right-hand
corner.
If you are using the Monitor Interfaces feature, experiment with
disconnecting each monitored link to ensure correct
configuration.
41 | Configuring a Stateful HA Pair
HA License Configuration Overview
You can configure HA license synchronization by associating
two Dell SonicWALL security appliances as HA Primary and HF
secondary on MySonicWALL. Note that the secondary
appliance of your HA pair is referred to as the HF Secondary
unit on MySonicWALL. Also note that the secondary appliance
must be an identical model to the primary applicancy (such as
two NSA E5500 appliances).
You must purchase a single set of security services licenses for
the HA Primary appliance. To use Stateful HA, you must first
activate the Stateful High Availability Upgrade license for the
primary unit in SonicOS. This is automatic if the appliance is
connected to the Internet. See
Appliance on MySonicWALL, on page 20.
Registering and Licensing Your