Chapter 38 Device HA
ZyWALL / USG (ZLD) CLI Reference Guide
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38.1.1 Before You Begin
• Configure a static IP address for each interface that you will have device HA monitor.
Note: Subscribe to services on the backup ZyWALL / USG before synchronizing it with the
master ZyWALL / USG.
• Synchronization includes updates for services to which the master and backup ZyWALL / USGs
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 ZyWALL / USGs to the same services.
38.2 General Device HA Commands
This table lists the general commands for device HA.
38.3 Active-Passive Mode Device HA
Virtual Router
The master and backup ZyWALL / USG form a single ‘virtual router’.
Cluster ID
You can have multiple ZyWALL / USG virtual routers on your network. Use a different cluster ID to
identify each virtual router.
Monitored Interfaces in Active-Passive Mode Device HA
You can select which interfaces device HA monitors. If a monitored interface on the ZyWALL / USG
loses its connection, device HA has the backup ZyWALL / USG take over.
Enable monitoring for the same interfaces on the master and backup ZyWALL / USGs. 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 / USG.
Virtual Router and Management IP Addresses
• If a backup takes over for the master, it uses the master’s IP addresses. These IP addresses are
know as the virtual router IP addresses.
Table 153 device-ha General Commands
COMMAND DESCRIPTION
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 Sets the ZyWALL / USG to use active-passive device HA.
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