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When the MFF device receives an ARP request from a server, the device searches IP-to-MAC
address entries it has stored. Then the device replies with the requested MAC address to the server.
As a result, packets from a host to a server are forwarded by the gateway. However, packets from a
server to a host are not forwarded by the gateway.
MFF does not check whether the IP address of a server is on the same network segment as that of a
gateway. Instead, it checks whether the IP address of a server is all-zero or all-one. An all-zero or
all-one server IP address is invalid.
You can specify a server's IP address in either manual or automatic MFF mode.
NOTE:
If the server's interface connecting to the MFF device uses secondary IP addresses to send ARP
packets, include all these IP addresses in the server IP address list.
To specify the IP addresses of servers:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VLAN view.
vlan
vlan-id
N/A
3.
Specify the IP addresses of
servers.
mac-forced-forwarding server
server-ip
&<1-10>
By default, no server IP address is
specified.
Displaying and maintaining MFF
Execute
display
commands in any view.
Task Command
Display MFF port configuration information.
display mac-forced-forwarding interface
Display the MFF configuration information for a VLAN.
display mac-forced-forwarding vlan
vlan-id
MFF configuration examples
Auto-mode MFF configuration example in a tree network
Network requirements
As shown in
, all the devices are in VLAN 100. Hosts A, B, and C obtain IP addresses from
the DHCP server.
Configure MFF to isolate the hosts at Layer 2 and allow them to communicate with each other
through Gateway at Layer 3.
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