17-MFF Commands
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Table of Contents
display mac-forced-forwarding interface
display mac-forced-forwarding vlan
mac-forced-forwarding gateway probe
mac-forced-forwarding network-port
Syntax
display mac-forced-forwarding interface
View
Any view
Default Level
1: Monitor level
Parameters
None
Description
Use the display mac-forced-forwarding interface command to display MFF port configuration information.
Related commands: mac-forced-forwarding network-port.
Examples
# Display MFF port configuration information.
<Sysname> display mac-forced-forwarding interface
Network Port:
GigabitEthernet1/0/1 GigabitEthernet1/0/2
User Port:
GigabitEthernet1/0/3 GigabitEthernet1/0/4
Table 1-1 display mac-forced-forwarding interface command output description
|
Field |
Description |
|
Network Port |
List of network ports |
|
User Port |
List of user ports |
Syntax
display mac-forced-forwarding vlan vlan-id
View
Any view
Default Level
1: Monitor level
Parameters
vlan-id: VLAN ID.
Description
Use the display mac-forced-forwarding vlan command to display the MFF configuration information of a specified VLAN.
Related commands: mac-forced-forwarding, mac-forced-forwarding server.
Examples
# Display the MFF configuration information of VLAN 1.
<Sysname> display mac-forced-forwarding vlan 1
VLAN 1
Mode: Auto/Single
Gateway:
--------------------------------------------------------------------------
192.168.1.42 (000f-e200-8046)
Server:
--------------------------------------------------------------------------
192.168.1.48 192.168.1.49
Table 1-2 display mac-forced-forwarding vlan command output description
|
Field |
Description |
|
VLAN 1 |
ID of the VLAN to which the gateways belong |
|
Mode |
MFF operating mode, which can be automatic (Auto), manual (Manual), and single-gateway (Single). |
|
Gateway |
IP and MAC addresses of gateways. If no information is learned, N/A is displayed. |
|
Server |
Server IP addresses |
Syntax
mac-forced-forwarding { auto | default-gateway gateway-ip }
undo mac-forced-forwarding
View
VLAN view
Default Level
2: System level
Parameters
auto: Specifies the automatic mode.
default-gateway gateway-ip: Specifies the IP address of the default gateway in the manual mode.
Description
Use the mac-forced-forwarding command to enable MFF and specify an MFF operating mode. To enable the manual mode, you need to specify a default gateway.
Use the undo mac-forced-forwarding command to disable MFF.
By default, MFF is disabled.
Note that:
l If you execute this command repeatedly, the last configuration takes effect.
l If the automatic mode is specified, make sure that DHCP snooping works normally; if the manual mode is configured, make sure that ARP snooping works normally.
l For a network (or VLAN) with IP addresses manually configured, the gateway IP address should be configured manually as well; for a network (or VLAN) running DHCP, the gateway IP address can be configured manually, or can be resolved from the Option field in the DHCP messages.
Examples
# Enable MFF in the automatic mode for VLAN 1.
<Sysname> system-view
[Sysname] vlan 1
[Sysname-vlan1] mac-forced-forwarding auto
Syntax
mac-forced-forwarding gateway probe
undo mac-forced-forwarding gateway probe
View
VLAN view
Default Level
2: System level
Parameters
None
Description
Use the mac-forced-forwarding gateway probe command to enable periodic gateway MAC address probe. The probe interval is 30 seconds, and the probe mode can be manual or automatic.
Use the undo mac-forced-forwarding gateway probe command to restore the default.
By default, periodic gateway MAC address probe is disabled.
Make sure you have enabled MFF before executing the mac-forced-forwarding gateway probe command.
Examples
# Enable periodic gateway MAC address probe.
<Sysname> system-view
[Sysname] vlan 1
[Sysname-vlan1] mac-forced-forwarding gateway probe
Syntax
mac-forced-forwarding network-port
undo mac-forced-forwarding network-port
View
Layer 2 Ethernet port view
Default Level
2: System level
Parameters
None
Description
Use the mac-forced-forwarding network-port command to configure the Ethernet port as a network port.
Use the undo mac-forced-forwarding network-port command to restore the default.
By default, the port is a user port.
Note that:
l The upstream ports connecting to a gateway or the ports between devices in a ring network should be configured as network ports. You can configure multiple ports as network ports.
l You can configure a port as a network port regardless of whether MFF is enabled for the VLAN of the port; however, the configuration takes effect only after MFF is enabled.
l Link aggregation is supported by network ports in an MFF-enabled VLAN, but is not supported by user ports in the VLAN. If a network port is added to a link aggregation group belonging to an MFF-enabled VLAN, you need to remove the network port from the link aggregation group before you can cancel the network port configuration. For detailed information about link aggregation, refer to Ethernet Link Aggregation Configuration in the Configuration Guide - Part 3 – Access.
Examples
# Configure GigabitEthernet1/0/1 as a network port.
<Sysname> system-view
[Sysname] interface GigabitEthernet1/0/1
[Sysname-GigabitEthernet1/0/1] mac-forced-forwarding network-port
Syntax
mac-forced-forwarding server server-ip&<1-10>
undo mac-forced-forwarding server [ server-ip&<1-10> ]
View
VLAN view
Default Level
2: System level
Parameters
server-ip&<1-10>: IP address of a server in the network. &<1-10> means you can specify up to ten server IP addresses in one command line.
Description
Use the mac-forced-forwarding server command to specify the IP addresses of servers.
Use the undo mac-forced-forwarding server command to remove the specified server IP addresses. If no parameter is specified, all the server IP addresses are removed.
By default, no server IP address is specified.
You can use this command (in either manual or automatic MFF operating mode) to specify the IP address of a DHCP server, the IP address of a server providing some other service, or the real IP address of a VRRP group.
If the MFF device receives an ARP request from a server, it will search the IP-to-MAC address entries it has stored, and reply the corresponding MAC address to the server. In this way, packets from a server to a host are not forwarded by the gateway, while packets from a host to a server are forwarded by the gateway.
Note that:
l 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.
l If no server IP address is specified using this command, the clients cannot communicate with any server.
l Make sure MFF is enabled before you execute the mac-forced-forwarding server command.
l If no IP address is specified in the undo mac-forced-forwarding server command, all specified server IP addresses are removed.
Examples
# Specify the server at 192.168.1.100.
<Sysname> system-view
[Sysname] vlan 1
