ZyXEL Communications USG-300 - V2.20 ED 2 Manual page 182

Chapter 7 Tutorials
Set the Device Role to Backup. Activate monitoring for the ge1 and ge2
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interfaces. Set the Synchronization Server Address to 192.168.1.1, the Port
to 21, and the Password to "mySyncPassword". Select Auto Synchronize and
set the Interval to 60. Click Apply.
Figure 150 Configuration > Device HA > Active-Passive Mode: Backup ZyWALL
Example
Click the General tab. Turn on device HA and click Apply.
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Figure 151 Configuration > Device HA > General: Master ZyWALL Example
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ZyWALL USG 300 User's Guide