H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 13)

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• Standard protocol mode—VRRPv2 based on RFCs. VRRPv2 is implemented on IPv4 networks. For
more information, see " VRRP standard protocol mode ."
• Load balancing mode—Extends the standard protocol mode to distribute load across VRRP group
members. For more information, see "
VRRP load balancing mode ."
VRRP standard protocol mode
Introduction to VRRP group
VRRP combines a group of routers (one master and multiple backups) on a LAN into a virtual router
called a "VRRP group."
A VRRP group has the following features:
• A virtual router has a virtual IP address. A host on the LAN only needs to know the IP address of the
virtual router and uses the IP address as the next hop of the default route.
• Every host on the LAN communicates with external networks through the virtual router.
• Routers in the VRRP group elect a master that acts as the gateway according to their priorities. The
other routers function as the backups. When the master fails, to make sure that the hosts in the
network segment can uninterruptedly communicate with the external networks, the backups in the
VRRP group elect a new gateway to undertake the responsibility of the failed master.
Figure 2 Network diagram for VRRP
As shown in Figure 2 , Router A, Router B, and Router C form a virtual router, which has its own IP address.
Hosts on the Ethernet use the virtual router as the default gateway.
The router with the highest priority among the three routers is elected as the master to act as the gateway,
and the other two are backups.