Before You Begin; General Device Ha Commands; Active-Passive Mode Device Ha - ZyXEL Communications ZYWALL USG Series Reference Manual

Chapter 38 Device HA

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.
Table 153 device-ha General Commands
COMMAND
show device-ha status
[no] device-ha activate
device-ha mode active-passive

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.
264
DESCRIPTION
Displays whether or not device HA is activated, the configured device HA
mode, and the status of the monitored interfaces.
Turns device HA on or off.
Sets the ZyWALL / USG to use active-passive device HA.
ZyWALL / USG (ZLD) CLI Reference Guide