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DES-7200 Configuration Guide Chapter 1 VRRP Configuration
1-3
As shown in Figure-2, routers A, B and C are connected with the LAN through an
VRRP-enabled Ethernet interface. They are in the same VRRP group with virtual IP
address 192.168.12.1. Router A is elected as the master router of the VRRP, and
routers B and C are standby routers. Hosts 1, 2 and 3 in the LAN use the IP address of
the virtual router 192.168.12.1 as the gateway. The packets from the hosts in the LAN
to other networks will be forwarded by the master router (router A in Figure-2). Once
router A fails, the master router preempted between routers B and C undertakes the
route forwarding function of the virtual device, resulting in a simply route redundancy.
1.2.2 Load Balancing
The advanced VRRP applications are illustrated in Figure-3.
Figure-3: Advanced VRRP applications
As shown in Figure-3, two virtual devices are set. For virtual router 1, router A uses the
IP address of Ethernet interface Fa0/0 192.168.12.1 as the IP address of the virtual
router, and thus router A becomes the master router and router B becomes the backup.
For virtual router 2, router B uses the IP address of Ethernet interface Fa0/0
192.168.12.2 as the IP address of the virtual router, and thus router B becomes the