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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 66 Configuring Active/Standby Failover
Configuring Active/Standby Failover
Step 6 Specify the active IP address for the interface in the Active IP field. The IP address can be either an IPv4
or an IPv6 address. You cannot configure both types of addresses on the failover link interface.
Step 7 Depending upon the type of address specified for the Active IP, enter a subnet mask (IPv4 addresses) or
a prefix length (IPv6 address) for the failover interface in the Subnet Mask/Prefix Length field. The name
of the field changes depending upon the type of address specified in the Active IP field.
Step 8 Specify the IP address used by the secondary unit to communicate with the primary unit in the Standby
IP field. The IP address can be an IPv4 or an IPv6 address.
Step 9 Select Primary or Secondary in the Preferred Role field to specify whether the preferred role for this
ASA is as the primary or secondary unit.
Step 10 (Optional) Configure the Stateful Failover link by doing the following:
Note Stateful Failover is not available on the ASA 5505 platform. This area does not appear on ASDM
running on an ASA 5505.
a. Specifies the interface used for state communication. You can choose an unconfigured interface or
subinterface, the LAN Failover interface, or the Use Named option.
Note We recommend that you use two separate, dedicated interfaces for the LAN Failover interface
and the Stateful Failover interface.
If you choose an unconfigured interface or subinterface, you must supply the Active IP, Subnet
Mask, Standby IP, and Logical Name for the interface.
If you choose the LAN Failover interface, you do not need to specify the Active IP, Subnet Mask,
Logical Name, and Standby IP values; the values specified for the LAN Failover interface are used.
If you choose the Use Named option, the Logical Name field becomes a drop-down list of named
interfaces. Choose the interface from this list. The Active IP, Subnet Mask/Prefix Length, and
Standby IP values do not need to be specified. The values specified for the interface are used. Be
sure to specify a standby IP address for the selected interface on the Interfaces tab.
Note Because Stateful Failover can generate a large amount of traffic, performance for both Stateful
Failover and regular traffic can suffer when you use a named interface.
b. Specify the IP address for the Stateful Failover interface in the Active IP field. The IP address can
be either an IPv4 or an IPv6 address. You cannot configure both types of addresses on the failover
link interface. This field is dimmed if the LAN Failover interface or Use Named option is chosen
from the Interface drop-down list.
c. Specify the mask (IPv4 address) or prefix (IPv6 address) for the Stateful Failover interface in the
Subnet Mask/Prefix Length. This field is dimmed if the LAN Failover interface or Use Named
option is selected in the Interface drop-down list.
d. Specify the interface name used for failover communication in the Logical Name field. If you chose
the Use Named option in the Interface drop-down list, this field displays a list of named interfaces.
This field is dimmed if the LAN Failover interface is chosen from the Interface drop-down list.
e. Specify the IP address used by the secondary unit to communicate with the primary unit in the
Standby IP field. The IP address can be an IPv4 or an IPv6 address. This field is dimmed if the LAN
Failover interface or Use Named option is chosen from the Interface drop-down list.