Dear Jacob,
To enable the transmission of gratuitous Address Resolution Protocol (ARP) messages for an address in an address pool if the transmission has been disabled, use the ip gratuitous-arps command in global configuration mode. To disable the transmission, use the no form of this command.
ip gratuitous-arps [non-local]
no ip gratuitous-arps
Kindly refear to the below URL for more information about ARP configurations:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124tcr/tiad_r/adrarpht.htm#wp1156656
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Best Regards,
Mounir Mohamed