ZyXEL Communications ZyWALL 110 Handbook page 748

Go to the Configuration > Device HA > General screen.
Select Enable Device HA and click Apply.
Before the Device HA Pro feature is enabled on the secondary device, a warning
message will pop-up for you to confirm. Click OK to enable it.
1. Connecting the Device HA Pro Port
The Device HA Pro port is a new physical port on the DUT. You can use a cable to
connect the devices with each other.
www.zyxel.com
748/749