Introduction To Gratuitous Arp - Huawei Quidway S5600 Series Operation Manual

Operation Manual – ARP
Quidway S5600 Series Ethernet Switches-Release 1510
Figure 1-3 ARP work flow
Once ARP is deployed, the ARP work flow is automatically processed.

1.1.5 Introduction to Gratuitous ARP

The following are the characteristics of gratuitous ARP packets:
Both source and destination IP addresses carried in a gratuitous ARP packet are
the local addresses, and the source MAC address carried in it is the local MAC
addresses.
If a device finds that the IP addresses carried in a received gratuitous packet
conflict with those of its own, it returns an ARP response to the sending device to
notify of the IP address conflict.
By sending gratuitous ARP packets, a network device can:
Determine whether or not IP address conflicts exist between it and other network
devices.
Trigger other network devices to update its hardware address stored in their
caches.
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Chapter 1 ARP Configuration