Cisco 500 Series, Configuration Manual

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Cisco Security Appliance Command Line Configuration Guide
OL-12172-03
Chapter 14 Configuring Failover
Configuring Failover
•
Configure the Primary Unit, page 14-30
• Configure the Secondary Unit, page 14-32
Configure the Primary Unit
To configure the primary unit in an Active/Active failover configuration, perform the following steps:
Step 1 If you have not done so already, configure the active and standby IP addresses for each data interface
(routed mode), for the management IP address (transparent mode), or for the management-only
interface. The standby IP address is used on the security appliance that is currently the standby unit. It
must be in the same subnet as the active IP address.
You must configure the interface addresses from within each context. Use the changeto context
command to switch between contexts. The command prompt changes to
hostname/ context (config-if)#
, where context is the name of the current context. In transparent
firewall mode, you must enter a management IP address for each context.
Note
Do not configure an IP address for the Stateful Failover link if you are going to use a dedicated
Stateful Failover interface. You use the
failover interface ip command to configure a dedicated
Stateful Failover interface in a later step.
hostname/context(config-if)# ip address active_addr netmask standby standby_addr
In routed firewall mode and for the management-only interface, this command is entered in interface
configuration mode for each interface. In transparent firewall mode, the command is entered in global
configuration mode.
Step 2 Configure the basic failover parameters in the system execution space.
a.
(PIX 500 series security appliance only) Enable LAN-based failover:
hostname(config)# hostname(config)# failover lan enable
b. Designate the unit as the primary unit:
hostname(config)# failover lan unit primary
c.
Specify the failover link:
hostname(config)# failover lan interface if_name phy_if
The if_name argument assigns a logical name to the interface specified by the phy_if argument. The
phy_if argument can be the physical port name, such as Ethernet1, or a previously created
subinterface, such as Ethernet0/2.3. On the ASA 5505 adaptive security appliance, the phy_if
specifies a VLAN. This interface should not be used for any other purpose (except, optionally, the
Stateful Failover link).
d.
Specify the failover link active and standby IP addresses:
hostname(config)# failover interface ip if_name ip_addr mask standby ip_addr
The standby IP address must be in the same subnet as the active IP address. You do not need to
identify the standby IP address subnet mask. The failover link IP address and MAC address do not
change at failover. The active IP address always stays with the primary unit, while the standby IP
address stays with the secondary unit.