Chapter 39 Device HA
ZyWALL USG 100/200 Series User’s Guide
718
Legacy Mode ZyWALL VRRP Application
In VRRP, a virtual router represents a number of ZyWALLs associated with one IP
address, the IP address of the default gateway. Each virtual router is identified by
a unique 8-bit identification number called a Virtual Router ID (VR ID). In the
example below, ZyWALL A and ZyWALL B are part of virtual router 10 with IP
address 192.168.10.254.
Figure 483 Example: VRRP, Normal Operation
The VR ID is not shown. In normal operation, ZyWALL A is the master. It has the
same IP address as the default gateway and forwards traffic for the network.
ZyWALL B is a backup. It is using its management IP address 192.168.10.112.
ZyWALL A sends regular messages to ZyWALL B to let ZyWALL B know that
ZyWALL A is available. If ZyWALL A becomes unavailable, it stops sending
messages to ZyWALL B. ZyWALL B detects this and assumes the role of the
master. This is illustrated below.
Figure 484 Example: VRRP, Master Becomes Unavailable
ZyWALL B is now using the IP address of the default gateway, and it is forwarding
packets for the network. The loss of ZyWALL A has no effect on the network.
If there is more than one backup ZyWALL, the backup ZyWALL with the highest
priority becomes the master. The other backup ZyWALLs remain backups.
192.168.10.112
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