Discussion about the use of gratuitous ARP requests on X-Series chassis and their configuration
A gratuitous ARP request is an ARP request packet where the source and destination IP are both set to the IP of the machine issuing the packet and the destination MAC is the broadcast address ff:ff:ff:ff:ff:ff.
Gratuitous ARP requests are sent by Crossbeam to update other machines' ARP tables and to inform switches of the MAC address on a given switch port. The master VAP in the VAP group is responsible for sending gratuitous ARPs (as it is for other ARP communication).
The Crossbeam X-Series chassis implements gratuitous ARPs to support two different redundancy features:1) VRRP