Configuring Optional Active/Active Failover Settings - Cisco FirePOWER ASA 5500 series Configuration Manual

Configuring Failover

Configuring Optional Active/Active Failover Settings

The following optional Active/Active failover settings can be configured when you are initially
configuring failover or after you have already established failover. Unless otherwise noted, the
commands should be entered on the unit that has failover group 1 in the active state.
This section includes the following topics:
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Configuring Failover Group Preemption
Assigning a primary or secondary priority to a failover group specifies which unit the failover group
becomes active on when both units boot simultaneously. However, if one unit boots before the other, then
both failover groups become active on that unit. When the other unit comes online, any failover groups
that have the unit as a priority do not become active on that unit unless manually forced over, a failover
occurs, or the failover group is configured with the preempt command. The preempt command causes
a failover group to become active on the designated unit automatically when that unit becomes available.
Enter the following commands to configure preemption for the specified failover group:
hostname(config)# failover group {1 | 2}
hostname(config-fover-group)# preempt [delay]
You can enter an optional delay value, which specifies the number of seconds the failover group remains
active on the current unit before automatically becoming active on the designated unit.
Enabling HTTP Replication with Stateful Failover
To allow HTTP connections to be included in the state information, you need to enable HTTP
replication. Because HTTP connections are typically short-lived, and because HTTP clients typically
retry failed connection attempts, HTTP connections are not automatically included in the replicated state
information. You can use the replication http command to cause a failover group to replicate HTTP state
information when Stateful Failover is enabled.
To enable HTTP state replication for a failover group, enter the following command. This command only
affects the failover group in which it was configured. To enable HTTP state replication for both failover
groups, you must enter this command in each group. This command should be entered in the system
execution space.
hostname(config)# failover group {1 | 2}
hostname(config-fover-group)# replication http
Cisco Security Appliance Command Line Configuration Guide
14-32
Configuring Failover Group Preemption, page 14-32
Enabling HTTP Replication with Stateful Failover, page 14-32
Disabling and Enabling Interface Monitoring, page 14-33
Configuring Interface Health Monitoring, page 14-33
Configuring Failover Criteria, page 14-33
Configuring Virtual MAC Addresses, page 14-33
Configuring Asymmetric Routing Support, page 14-34
Chapter 14 Configuring Failover
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