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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter66 Configuring Active/Standby Failover
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:
•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.
Licensing Requirements for Active/Standby Failover
The following table shows the licensing requirements for this feature:
Prerequisites for Active/Standby Failover
Active/Standby failover has the following prerequisites:
•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.
Interface failure on active unit
above threshold
Failover Mark active as
failed
Become active None.
Interface failure on standby
unit above threshold
No failover No action Mark standby as
failed
When the standby unit is marked as
failed, then the active unit does not
attempt to fail over even if the
interface failure threshold is
surpassed.
Table66-2 Failover Behavior (continued)
Failure Event Policy Active Action Standby Action Notes
Model License Requirement
ASA 5505 Security Plus License. (Stateful failover is not supported).
ASA 5510, ASA
5512-X
Security Plus License.
All other models Base License.