Cisco ASA Series Cli Configuration Manual page 430

Starting Interface Configuration (ASA 5510 and Higher)
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Configuring a Redundant Interface
A logical redundant interface consists of a pair of physical interfaces: an active and a standby interface.
When the active interface fails, the standby interface becomes active and starts passing traffic. You can
configure a redundant interface to increase the ASA reliability. This feature is separate from device-level
failover, but you can configure redundant interfaces as well as failover if desired.
This section describes how to configure redundant interfaces and includes the following topics:
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Configuring a Redundant Interface
This section describes how to create a redundant interface. By default, redundant interfaces are enabled.
Guidelines and Limitations
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Prerequisites
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Caution
If you are using a physical interface already in your configuration, removing the name will clear any
configuration that refers to the interface.
Cisco ASA Series CLI Configuration Guide
1-26
For single context mode, complete the interface configuration. See
Interface Configuration (Routed Mode),"
(Transparent Mode)."
Configuring a Redundant Interface, page 1-26
Changing the Active Interface, page 1-28
You can configure up to 8 redundant interface pairs.
Redundant interface delay values are configurable, but by default the ASA inherits the default delay
values based on the physical type of its member interfaces.
See also the "Redundant Interface Guidelines" section on page
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 using the no nameif command.
For multiple context mode, complete this procedure in the system execution space. To change from
the context to the system execution space, enter the changeto system command.
Chapter 1 Starting Interface Configuration (ASA 5510 and Higher)
or Chapter 1, "Completing Interface Configuration
1-11.
Chapter 1, "Completing