Log into the primary FortiGate CLI and enter this command to convert the cluster from an active-passive to an active-active cluster. The cluster changes modes without any traffic interruption.
config system ha
set mode a-a
Active-active HA load-balancing distributes proxy-based NGFW/UTM processing to all cluster members. Proxy-based NGFW/UTM processing is CPU and memory-intensive. Distributing NGFW/UTM processing in this way may result in higher throughput.