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Dell EMC Configuration Guide for the S4048T–ON System 9.14.2.4

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ARP Learning via Gratuitous ARP

Gratuitous ARP can mean an ARP request or reply.

In the context of ARP learning via gratuitous ARP on Dell EMC Networking OS, the gratuitous ARP is a request. A gratuitous ARP request is an ARP request that is not needed according to the ARP specification, but one that hosts may send to:
  • detect IP address conflicts
  • inform switches of their presence on a port so that packets can be forwarded
  • update the ARP table of other nodes on the network in case of an address change

In the request, the host uses its own IP address in the Sender Protocol Address and Target Protocol Address fields.


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