ZyXEL Communications 3.1 User Manual

Chapter 25 Device HA

ZyWALL (ZLD) CLI Reference Guide

Otherwise you must manually configure the master ZyWALL’s settings on the backup (by editing 
copies of the configuration files in a text editor for example).

• Configure a static IP address for each interface that you will have device HA monitor. 

Note: Subscribe to services on the backup ZyWALL before synchronizing it with the 

master ZyWALL.

• Synchronization includes updates for services to which the master and backup ZyWALLs are both 

subscribed. For example, a backup subscribed to IDP/AppPatrol, but not anti-virus, gets IDP/
AppPatrol updates from the master, but not anti-virus updates. It is highly recommended to 
subscribe the master and backup ZyWALLs to the same services.

This table lists the general commands for device HA.

The master and backup ZyWALL form a single ‘virtual router’. 

You can have multiple ZyWALL virtual routers on your network. Use a different cluster ID to identify 
each virtual router. 

You can select which interfaces device HA monitors. If a monitored interface on the ZyWALL loses 
its connection, device HA has the backup ZyWALL take over.

Enable monitoring for the same interfaces on the master and backup ZyWALLs. Each monitored 
interface must have a static IP address and be connected to the same subnet as the corresponding 
interface on the backup or master ZyWALL.  

device-ha General Commands

show device-ha status

Displays whether or not device HA is activated, the configured device HA 
mode, and the status of the monitored interfaces. 

[no] device-ha activate

Turns device HA on or off.

device-ha mode {active-passive | legacy}

Sets the ZyWALL to use active-passive or legacy (VRRP group based) 
device HA.