Cisco ASA 5505 - Manual (Page 267)

6-25
Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 6 Starting Interface Configuration (ASA 5510 and Higher)
Starting Interface Configuration (ASA 5510 and Higher)
• For single context mode, complete the interface configuration. See Chapter 8, “Completing
Interface Configuration (Routed Mode),” or Chapter 9, “Completing Interface Configuration
(Transparent Mode).”
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:
• Configuring a Redundant Interface, page 6-25
• Changing the Active Interface, page 6-27
Configuring a Redundant Interface
This section describes how to create a redundant interface. By default, redundant interfaces are enabled.
Guidelines and Limitations
• 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 6-10 .
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 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.
Caution If you are using a physical interface already in your configuration, removing the name will clear any
configuration that refers to the interface.