To do… Use the command… RemarksEnable the ARP entry checkingfunction (that is, disable theswitch from learning ARPentries with multicast MACaddresses)arp check enable OptionalEnabled by default.z Static ARP entries are valid as long as the Ethernet switch operates normally. But some operations,such as removing a VLAN, or removing a port from a VLAN, will make the corresponding ARPentries invalid and therefore removed automatically.z As for the arp static command, the value of the vlan-id argument must be the ID of an existingVLAN, and the port identified by the interface-type and interface-number arguments must belong tothe VLAN.z Currently, static ARP entries cannot be configured on the ports of an aggregation group.Configuring Gratuitous ARPFollow these steps to configure gratuitous ARP:To do… Use the command… RemarksEnter system view system-view —Enable the gratuitous ARPpacket learning functiongratuitous-arp-learningenableOptionalDisabled by default.Enter VLAN interface view interface Vlan-interfacevlan-id —Enable the VLAN interface tosend gratuitous ARP packetsperiodicallygratuitous-arpperiod-resending enableOptionalEnabled by default.The sending of gratuitous ARP packets is enabled as long as an S4500 switch operates. No commandis needed for enabling this function. That is, the device sends gratuitous ARP packets whenever aVLAN interface is enabled (such as when a link is enabled or an IP address is configured for the VLANinterface) or whenever the IP address of a VLAN interface is changed.36-5
