Chapter 9 High Availability for FortiOS 5.0 : HA and failover protection : Cluster virtual MAC addresses : Diagnosing packet loss with two FortiGate HA clusters in the same broadcast domain : Example topology
  
Example topology
The topology below shows two clusters. The Cluster_1 internal interfaces and the Cluster_2 port 1 interfaces are both connected to the same broadcast domain. In this topology the broadcast domain could be an internal network. Both clusters could also be connected to the Internet or to different networks.
Figure 209: Example HA topology with possible MAC address conflicts