Chapter 41 Device HA
ZyWALL/USG Series User’s Guide
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Cluster ID
You can have multiple ZyWALL/USG virtual routers on your network. Use a different cluster ID to
identify each virtual router. In the following example, ZyWALL/USGs A and B form a virtual router
that uses cluster ID 1. ZyWALL/USGs C and D form a virtual router that uses cluster ID 2.
Figure 487 Cluster IDs for Multiple Virtual Routers
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.
• Each interface can also have a management IP address. You can connect to this IP address to
manage the ZyWALL/USG regardless of whether it is the master or the backup.
For example, ZyWALL/USG B takes over A’s 192.168.1.1 LAN interface IP address. This is a virtual
router IP address. ZyWALL/USG A keeps it’s LAN management IP address of 192.168.1.5 and
ZyWALL/USG B has its own LAN management IP address of 192.168.1.6. These do not change
when ZyWALL/USG B becomes the master.
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