Cisco ASA 5505 Configuration Manual page 1223

Chapter 59 Configuring 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:
Model License Requirement
ASA 5505 Security Plus License. (Stateful Failover is not supported.)
All other models Base License.
Prerequisites for Active/Standby Failover
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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Firewall Mode Guidelines
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OL-20339-01
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.
Both units must be identical security appliances 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.
Supported in transparent and routed firewall mode.
Licensing Requirements for Active/Standby Failover
Cisco ASA 5500 Series Configuration Guide using ASDM
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