3Com Switch 8800 Configuration Guide Chapter 12 ARP Configuration12-2corresponding MAC address of Host B and adds them to its own ARP mapping table.Then Host A sends Host B all the packets standing in the queue.Normally, dynamic ARP takes effect and automatically searches for the resolution fromthe IP address to the Ethernet MAC address without the help of an administrator.12.2 Configuring ARPThe ARP mapping table can be maintained dynamically or manually. Usually, themanually configured mapping from the IP addresses to the MAC addresses is knownas static ARP. The user can display, add or delete the entries in the ARP mapping tablethrough relevant manual maintenance commands.The following sections describe static ARP configuration tasks:z Manually Adding/Deleting Static ARP Mapping Entriesz Configuring the Dynamic ARP Aging Timerz Enabling/Disabling the Checking Function of ARP Entry12.2.1 Manually Adding/Deleting Static ARP Mapping EntriesPerform the following configuration in system view.Table 12-1 Manually add/delete static ARP mapping entriesOperation CommandManually add a static ARP mappingentryarp static ip-address mac-address[ vlan-id { interface_type interface_num |interface_name } | vpn-instance-name ]Manually delete a static ARP mappingentry undo arp ip-addressBy default, the ARP mapping table is empty and the address mapping is obtainedthrough dynamic ARP.Note that:z As long as a switch operates, its static ARP mapping entries remain valid unlessyou perform operations that make ARP invalid, such as change or remove VLANvirtual interfaces, remove a VLAN, or remove an interface from a VLAN. Theseoperations cause the corresponding ARP mapping entries to be automaticallyremoved.z The vlan-id argument must be the ID of a VLAN that has been created by the user,and the Ethernet port specified behind this parameter must belong to the VLAN.z As for the vpn-instance-name argument, you must provide the VPN-instancename of an existing MPLS VPN for it.z ARP map entries with port parameters cannot be configured for aggregated ports.
