H3C Technologies H3C S3600 Series Switches - Manual (Page 625)

5-4
z After receiving an ARP request from a host, the MFF device sends the MAC address of the
corresponding gateway to the host. In this way, hosts in the network have to communicate at Layer
3 through a gateway.
z After receiving an ARP request from a gateway, the MFF device sends the requested host’s MAC
address to the gateway if the corresponding entry is available; if the entry is not available, the MFF
device 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 Standards
RFC4562: MAC-Forced Forwarding
MFF Configuration
Table 5-1 Configure MFF
Operation Remarks
Enabling MFF Required
Specifying the IP Addresses of Servers Optional
Configuring User Port Required
Configuring Network PortConfiguring Network
PortConfiguring Network Port
Required
If VLAN mapping is enabled on an MFF-capable access-layer switch, to ensure that the MFF gateway
and the access-layer switch operate normally, you need to configure the MFF gateway and the VLAN
interfaces of the access-layer switch to belong to a network-side VLAN and manually configure the
VLAN interface IP addresses to be on the same network segment as the MFF gateway IP address.
Enabling MFF
Follow these steps to enable MFF:
Operation Command Remarks
Enter system view system-view —
Enter VLAN view vlan vlan-id —
Enable MFF and specify an
MFF operating mode
arp mac-forced-forwarding
{ auto | default-gateway
gateway-ip }
Required
Disabled by default.