After the primary fails, the secondary takes over and begins to pass traffic. In contrast, when configured in active-standby mode, the primary appliance is the active one and the secondary appliance is in standby and does not pass traffic. When a pair of Cisco ASAs is configured in active-active failover mode, both appliances are actively passing traffic at the same time. Because network devices see no change in the MAC-to-IP address pairing, no ARP entries change or time out anywhere on the network. The unit that is now in standby state takes over the standby IP addresses and MAC addresses. The unit that becomes active takes ownership of the IP addresses and MAC addresses of the failed unit. NOTE When the active unit fails, it changes to the standby state while the standby unit changes to the active state. The Cisco ASA supports active-active and active-standby failover. Maintaining appropriate redundancy mechanisms within infrastructure devices is extremely important for any organization.
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