1-6z Determining whether its IP address is already used by another device.z Informing other devices of its MAC address change so that they can update their ARP entries.A device receiving a gratuitous ARP packet adds the information carried in the packet to its owndynamic ARP table if it finds no corresponding ARP entry for the ARP packet in the cache.Configuring Gratuitous ARPFollow these steps to configure gratuitous ARP:To do… Use the command… RemarksEnter system view system-view —Enable the device to sendgratuitous ARP packets whenreceiving ARP requests fromanother network segmentgratuitous-arp-sendingenableRequiredBy default, a device cannotsend gratuitous ARP packetswhen receiving ARP requestsfrom another network segment.Enable the gratuitous ARPpacket learning functiongratuitous-arp-learningenableOptionalEnabled by default.Displaying and Maintaining ARPTo do… Use the command… RemarksDisplay ARP entries in theARP tabledisplay arp [ [ all | dynamic | static ] [ slotslot-number ] | vlan vlan-id | interfaceinterface-type interface-number ] [ [ |{ begin | exclude | include }regular-expression ] | count ]Available in any viewAvailable in any viewDisplay the ARP entry for aspecified IP addressdisplay arp ip-address [ slot slot-number ][ | { begin | exclude | include }regular-expression ] Available in any viewDisplay the aging time fordynamic ARP entries display arp timer aging Available in any viewClear ARP entries from theARP tableFor distributed devicesreset arp { all | dynamic | static | slotslot-number | interface interface-typeinterface-number }Available in user view
