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This chapter provides information and configuration tasks specific to the High Availability
page on the Dell SonicWALL SRA management interface.
High Availability allows two identical SRA 4200 or two SRA 4600 appliances to provide a
reliable, continuous connection to the public Internet. The two SRA appliances are deployed at
the same time and connected together, and are called a High Availability Pair (HA Pair).
This chapter contains the following sections:
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High Availability Overview
High Availability requires one SRA appliance configured as the primary device, and an identical
SRA configured as the backup device.
During normal operation, the primary device is in an active state, and services all connections.
The backup device is in an idle state. When the primary device loses connectivity, the backup
transitions to the active state and begins to service outside connections. The necessary data is
synchronized between primary and backup devices, including settings data and session data.
The failover applies to loss of functionality or network-layer connectivity on the primary
appliance. The failover to the backup unit occurs when critical services are affected, physical
(or logical) link failure is detected, or when the primary unit loses power.
Supported Platforms
High Availability is supported in SRA 5.0 or higher on the SRA 4200, and in SRA 6.0.0.6 or
higher on the SRA 4600.
High Availability Configuration
"High Availability Overview" section on page 229
"Configuring High Availability" section on page 230
"Technical FAQ" section on page 233
Chapter 11
High Availability Configuration | 229
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