Operation Manual – ARPH3C S5600 Series Ethernet Switches Chapter 1 ARP Configuration1-7A device receiving a gratuitous ARP packet adds the information carried in the packetto its own dynamic ARP table if it finds no corresponding ARP entry for the ARP packetexists in the cache.If a VRRP backup group exists on a network, the master switch sends gratuitous ARPpackets periodically to hosts on the network, which then update their local ARP tables,ensuring that no device on this network uses the same IP address with the VRRPvirtual router.As you can create mappings between the IP address and MAC address of the VRRPvirtual router, there are two cases:z If the IP address of the virtual router corresponds to a virtual MAC address, thesource MAC address in the gratuitous ARP packet will be the virtual MAC address.z If the IP address of the virtual router corresponds to an actual MAC address, thesource MAC address in the gratuitous ARP packet will be the VLAN interface’sMAC address of the master switch in the VRRP backup group.1.2 Configuring ARP1.2.1 Configuring ARP Basic FunctionsFollow these steps to configure ARP basic functions:To do… Use the command… RemarksEnter system view system-view —Add a static ARP entryarp static ip-addressmac-address [ vlan-idinterface-typeinterface-number ]OptionalBy default, the ARPmapping table is empty,and entries are createddynamically by ARP.Configure the ARP agingtimerarp timer agingaging-timeOptional20 minutes by default.Enable the ARP entrychecking function (that is,disable the switch fromlearning ARP entries withmulticast MACaddresses)arp check enable OptionalEnabled by default.
