H3C Technologies H3C SR8800 - Manual (Page 58)

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Figure 16 Allocating virtual MAC addresses
2. After receiving an ARP request destined for the virtual IP address of the VRRP group from a host, the
master, based on the load balancing algorithm, uses a corresponding virtual MAC address to
answer the ARP request. For example, as shown Figure 17 , when Host A sends an ARP request to
retrieve the MAC address of gateway 10.1.1.1, the master (Router A), after receiving the request,
returns the virtual MAC address of Router A to Host A; when Host B sends an ARP request to
retrieve the MAC address of gateway 10.1.1.1, the master (Router A), after receiving the request,
returns the virtual MAC address of Router B to Host B.
Figure 17 Answering ARP requests
3. Different hosts send packets to different routers according to the requested virtual MAC addresses.
For example, as shown in
Figure 18 , Host A regards the virtual MAC address of Router A as the
gateway MAC address, so it sends packets to Router A for forwarding; Host B regards the virtual