H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 19)

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Assigning virtual MAC addresses
When VRRP is operating in load balancing mode, the master assigns virtual MAC addresses to the
routers in the VRRP group and answers the ARP requests or ND requests from different hosts. The backup
routers, however, do not answer the ARP requests or ND requests from the hosts.
Assume that a VRRP group is operating in an IPv4 network. The load balancing mode works as follows:
1. The master assigns virtual MAC addresses to all members (including itself). This example assumes
that the virtual IP address of the VRRP group is 10.1.1.1/24, Router A is the master, and Router B
and Router C are the backups. Router A assigns 000f-e2ff-0011 to itself and 000f-e2ff-0012 to
Router B.
Figure 6 Virtual MAC addresses assignment
2. When an ARP request arrives, the master (Router A) selects a virtual MAC address based on the
load balancing algorithm to answer the ARP request. In this example, Router A returns the virtual
MAC address of itself in response to the ARP request from Host A, and returns the virtual MAC
address of Router B in response to the ARP request from Host B (see Figure 7 ).