Cisco ASA 5505 Configuration Manual page 1242

Licensing Requirements for Active/Active Failover
Optional Active/Active Failover Settings
You can configure the following Active/Standby failover options when you initially configuring failover
or after failover has been configured:
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Licensing Requirements for Active/Active Failover
The following table shows the licensing requirements for this feature:
Model License Requirement
ASA 5505 No support.
ASA 5510 Security Plus License.
All other models Base License.
Prerequisites for Active/Active Failover
In Active/Active failover, both units must have the following:
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Cisco ASA 5500 Series Configuration Guide using ASDM
60-6
Failover Group Preemption—Assigns a primary or secondary priority to a failover group to specify
on which unit in the failover group becomes active when both units boot simultaneously.
HTTP replication with Stateful Failover—Allows connections to be included in the state
information replication.
Interface monitoring—Allows you to monitor up to 250 interfaces on a unit and control which
interfaces affect your failover.
Interface health monitoring—Enables the security appliance to detect and respond to interface
failures more quickly.
Failover criteria setup—Allows you to specify a specific number of interfaces or a percentage of
monitored interfaces that must fail before failover occurs.
Virtual MAC address configuration—Ensures that the secondary unit uses the correct MAC
addresses when it is the active unit, even if it comes online before the primary unit.
The same hardware model
The same number of interfaces
The same types of interfaces
The same software version, with the same major (first number) and minor (second number) version
numbers. However you can use different versions of the software during an upgrade process; for
example you can upgrade one unit from Version 7.0(1) to Version 7.9(2) and have failover remain
active. We recommend upgrading both units to the same version to ensure long-term compatibility.
(See the "Performing the Downgrade" section on page 75-20
the software on a failover pair.)
The same software configuration
The same mode (multiple context mode)
The proper license
Chapter 60 Configuring Active/Active Failover
for more information about upgrading
OL-20339-01