ZyXEL Communications NXC5200 User Manual page 367

Figure 163 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 NXC loses its connection, device HA has the backup NXC take over.
Enable monitoring for the same interfaces on the master and backup NXCs. 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 NXC.
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 NXC regardless of whether it is the master or the
backup.
For example, NXC B takes over A's 192.168.1.1 LAN interface IP address. This is a
virtual router IP address. NXC A keeps it's LAN management IP address of
192.168.1.5 and NXC B has its own LAN management IP address of 192.168.1.6.
These do not change when NXC B becomes the master.
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