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Cisco ASA 5500 Series Configuration Guide using ASDM
OL-20339-01
Chapter 8 Configuring Interfaces
Starting Interface Configuration (ASA 5510 and Higher)
Contexts and Automatically Assigning MAC Addresses (Multiple Context Mode)” section on
page 8-16). When the active interface fails over to the standby, the same MAC address is maintained so
that traffic is not disrupted.
Prerequisites
• Both member interfaces must be of the same physical type. For example, both must be Ethernet.
• You cannot add a physical interface to the redundant interface if you configured a name for it. You
must first remove the name in the Configuration > Device Setup > Interfaces pane.
• For multiple context mode, complete this procedure in the system execution space. If you are not
already in the System configuration mode, in the Configuration > Device List pane, double-click
System under the active device IP address.
Caution If you are using a physical interface already in your configuration, removing the name will clear any
configuration that refers to the interface.
Detailed Steps
You can configure up to 8 redundant interface pairs. To configure a redundant interface, perform the
following steps:
Step 1 Depending on your context mode:
• For single mode, choose the Configuration > Device Setup > Interfaces pane.
• For multiple mode in the System execution space, choose the Configuration > Context
Management > Interfaces pane.
Step 2 Click Add > Redundant Interface.
The Add Redundant Interface dialog box appears.
Step 3 In the Redundant ID field, enter an integer between 1 and 8.
Step 4 From the Primary Interface drop-down list, choose the physical interface you want to be primary.
Be sure to pick an interface that does not have a subinterface and that has not already been allocated to
a context.
Step 5 From the Secondary Interface drop-down list, choose the physical interface you want to be secondary.
Step 6 If the interface is not already enabled, check the Enable Interface check box.
The interface is enabled by default. To disable it, uncheck the check box.
Step 7 To add a description, enter text in the Description field.
The description can be up to 240 characters on a single line, without carriage returns. For multiple
context mode, the system description is independent of the context description. In the case of a failover
or state link, the description is fixed as “LAN Failover Interface,” “STATE Failover Interface,” or
“LAN/STATE Failover Interface,” for example. You cannot edit this description. The fixed description
overwrites any description you enter here if you make this interface a failover or state link.
Step 8 Click OK.
You return to the Interfaces pane.
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