As the defination about the Gratutous ARP says it is a feature of the Address Resolution Protocol wherein the host broadcasts an ARP request for its own hardware address.A gratuitous ARP could be a request or a reply. A gratuitous ARP Request is the one where the Source and Destination IP address will be of the host itself which issues the request and is broadcast to the subnet and normally there will not be a reply.
This concept is used to avoid ip confilct in the network by single device in the network.
A Gratuitious ARP reply is again the one where there was no request.
The switch to which the device is connected can update its MAC Address table against the switch port.
Will cisco switches/routers learn and add entry in ARP cache using GARP packet??...
i.e when a switch/router receives an GARP,will the source learning take place?
Basically yes, a switch/router will update it's arp cache when it sees a gratuituos arp. As Ganesh said it is used to avoid address conflicts but the other major use i have seen is in clustering solutions where a machine fails over to another and the new active machine sends out a gratuitous arp to update the switch mac-address tables.
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