ZyWALL Series CLI Reference Guide
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CHAPTER 48
Device HA
Use device HA to increase network reliability. Device HA lets a backup Zyxel Device (B) automatically
take over if a master Zyxel Device (A) fails.
Figure 36 Device HA Backup Taking Over for the Master
48.1 Device HA Overview
Active-Passive Mode
• Active-passive mode lets a backup Zyxel Device take over if the master Zyxel Device fails.
• The Zyxel Devices must all support and be set to use the same device HA mode (either active-passive
or legacy).
Management Access
You can configure a separate management IP address for each interface. You can use it to access the
Zyxel Device for management whether the Zyxel Device is the master or a backup. The management IP
address should be in the same subnet as the interface IP address.
Synchronization
Use synchronization to have a backup Zyxel Device copy the master Zyxel Device’s configuration,
signatures (anti-virus, IDP/application patrol, and system protect), and certificates.
Note: Only Zyxel Devices of the same model and firmware version can synchronize.
Otherwise you must manually configure the master Zyxel Device’s settings on the backup (by editing
copies of the configuration files in a text editor for example).
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