Failover Configuration on Cisco ASA 8.3+

//Configuration Snapshot
//Primary Unit Configuration
1.) Configure the active and standby IP addresses for each interface (routed mode) or management interface (transparent mode).

//Configuration
{
int Ethernet0/1
ip address 172.16.1.1 255.255.255.0 standby 172.16.1.2

//Enable lan based failover
failover lan enable

//Designate the unit as the primary unit
failover lan unit primary

//Define the failover interface
failover lan interface Failover Ethernet0/3

interface Ethernet0/3

description LAN/STATE Failover Interface



failover replication http

failover link Failover Ethernet0/3

failover interface ip Failover 172.16.x.51 255.255.255.0 standby 172.16.x.52

}