Cisco ASA Series Cli Configuration Manual page 364

Licensing Requirements for Active/Standby Failover
Optional Active/Standby 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/Standby Failover
The following table shows the licensing requirements for this feature:
Prerequisites for Active/Standby Failover
Model License Requirement
ASA 5505 Security Plus License. (Stateful failover is not supported).
ASA 5510, Security Plus License.
ASA 5512-X
All other models Base License.
Active/Standby failover has the following prerequisites:
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Guidelines and Limitations
This section includes the guidelines and limitations for this feature.
Context Mode Guidelines
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Cisco ASA Series CLI Configuration Guide
1-6
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 ASA 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.
Both units must be identical ASAs that are connected to each other through a dedicated failover link
and, optionally, a Stateful Failover link.
Both units must have the same software configuration and the proper license.
Both units must be in the same mode (single or multiple, transparent or routed).
Supported in single and multiple context mode.
For multiple context mode, perform all steps in the system execution space unless otherwise noted.
Chapter 1 Configuring Active/Standby Failover