ZyXEL Communications VPN Series Handbook page 744

Configurations on the Primary Device
1. Go to the Configuration > Device HA > Device HA Pro screen.
2. Enter the device's license serial number from the myZyXEL.com server.
3. Enter the management IP address after enabling the Device HA Pro feature.
4. Select the interfaces which you would like to monitor.
5. Enable failover when an interface fails.
6. Click Apply.
Go to the Configuration > Device HA > General screen.
Select Enable Device HA and click Apply to enable Device HA Pro.
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