5-4z After receiving an ARP request from a host, the MFF device sends the MAC address of thecorresponding gateway to the host. In this way, hosts in the network have to communicate at Layer3 through a gateway.z After receiving an ARP request from a gateway, the MFF device sends the requested host’s MACaddress to the gateway if the corresponding entry is available; if the entry is not available, the MFFdevice will forward the ARP request.z The MFF device forwards ARP replies between hosts and gateways.z If the source MAC addresses of ARP requests from gateways are different from those recorded,the MFF device updates and broadcasts the IP and MAC addresses of the gateways.Protocols and StandardsRFC4562: MAC-Forced ForwardingMFF ConfigurationTable 5-1 Configure MFFOperation RemarksEnabling MFF RequiredSpecifying the IP Addresses of Servers OptionalConfiguring User Port RequiredConfiguring Network PortConfiguring NetworkPortConfiguring Network PortConfiguring NetworkPortRequiredIf VLAN mapping is enabled on an MFF-capable access-layer switch, to ensure that the MFF gatewayand the access-layer switch operate normally, you need to configure the MFF gateway and the VLANinterfaces of the access-layer switch to belong to a network-side VLAN and manually configure theVLAN interface IP addresses to be on the same network segment as the MFF gateway IP address.Enabling MFFFollow these steps to enable MFF:Operation Command RemarksEnter system view system-view —Enter VLAN view vlan vlan-id —Enable MFF and specify an MFFoperating modearp mac-forced-forwarding{ auto | default-gatewaygateway-ip }RequiredDisabled by default.
