Cisco ASA 5505 Configuration Manual page 1219

Configuring Active/Standby Failover
This chapter describes how to configure active/standby failover and includes the following sections:
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Information About Active/Standby Failover
This section describes Active/Standby failover and includes the following topics:
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Active/Standby Failover Overview
Active/Standby failover enables you to use a standby adaptive security appliance to take over the
functionality of a failed unit. When the active unit fails, it changes to the standby state while the standby
unit changes to the active state. The unit that becomes active assumes the IP addresses (or, for transparent
firewall, the management IP address) and MAC addresses of the failed unit and begins passing traffic.
The unit that is now in standby state takes over the standby IP addresses and MAC addresses. Because
network devices see no change in the MAC to IP address pairing, no ARP entries change or time out
anywhere on the network.
OL-20339-01
Information About Active/Standby Failover, page 59-1
Licensing Requirements for Active/Standby Failover, page 59-5
Prerequisites for Active/Standby Failover, page 59-5
Guidelines and Limitations, page 59-5
Configuring Active/Standby Failover, page 59-6
Controlling Failover, page 59-12
Monitoring Active/Standby Failover, page 59-14
Feature History for Active/Standby Failover, page 59-17
Active/Standby Failover Overview, page 59-1
Primary/Secondary Status and Active/Standby Status, page 59-2
Device Initialization and Configuration Synchronization, page 59-2
Command Replication, page 59-3
Failover Triggers, page 59-3
Failover Actions, page 59-4
C H A P T E R
Cisco ASA 5500 Series Configuration Guide using ASDM
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