Cisco ASA 5505 Configuration Manual page 241

Chapter 8 Configuring Interfaces
Contexts and Automatically Assigning MAC Addresses (Multiple Context Mode)" section on
page
that traffic is not disrupted.
Prerequisites
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If you are using a physical interface already in your configuration, removing the name will clear any
Caution
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:
Depending on your context mode:
Step 1
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Click Add > Redundant Interface.
Step 2
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.
If the interface is not already enabled, check the Enable Interface check box.
Step 6
The interface is enabled by default. To disable it, uncheck the check box.
To add a description, enter text in the Description field.
Step 7
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.
Click OK.
Step 8
You return to the Interfaces pane.
OL-20339-01
8-16). When the active interface fails over to the standby, the same MAC address is maintained so
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.
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.
Starting Interface Configuration (ASA 5510 and Higher)
Cisco ASA 5500 Series Configuration Guide using ASDM
8-13