Auto-mode MFF configuration example in a ring network

As shown in Figure 116, all the devices are in VLAN 100, and the switches form a ring. Host A, Host B, and Host C obtain IP addresses from the DHCP server. They are isolated at Layer 2, and can communicate with each other through the gateway. MFF automatic mode is enabled on Switch A and Switch B.

<Gateway> system-view
[Gateway] interface Vlan-interface 1
[Gateway-Vlan-interface1] ip address 10.1.1.100 24

# Enable DHCP and configure an address pool.

<Device> system-view
[Device] dhcp enable
[Device] dhcp server ip-pool 1
[Device-dhcp-pool-1] network 10.1.1.0 mask 255.255.255.0

# Add gateway's IP address into DHCP address pool 1.

[Device-dhcp-pool-1] gateway-list 10.1.1.100
[Device-dhcp-pool-1] quit

# Configure the IP address of VLAN-interface 1.

[Device] interface Vlan-interface 1
[Device-Vlan-interface1] ip address 10.1.1.50 24

# Enable DHCP snooping.

<SwitchA> system-view
[SwitchA] dhcp-snooping

# Enable STP.

[SwitchA] stp enable

# Enable MFF in automatic mode.

[SwitchA] vlan 100
[SwitchA-vlan-100] mac-forced-forwarding auto
[SwitchA-vlan-100] quit

# Configure Ethernet 1/0/2 as a network port.

[SwitchA] interface ethernet 1/0/2
[SwitchA-Ethernet1/0/2] mac-forced-forwarding network-port

# Configure Ethernet 1/0/2 as a DHCP snooping trusted port.

[SwitchA-Ethernet1/0/2] dhcp-snooping trust
[SwitchA-Ethernet1/0/2] quit

# Configure Ethernet 1/0/3 as a network port.

[SwitchA] interface ethernet 1/0/3
[SwitchA-Ethernet1/0/3] mac-forced-forwarding network-port

# Configure Ethernet 1/0/3 as a DHCP snooping trusted port.

[SwitchA-Ethernet1/0/3] dhcp-snooping trust no-user-binding

# Enable DHCP snooping.

<SwitchB> system-view
[SwitchB] dhcp-snooping

# Enable STP.

[SwitchB] stp enable

# Enable MFF in automatic mode.

[SwitchB] vlan 100
[SwitchB-vlan-100] mac-forced-forwarding auto
[SwitchB-vlan-100] quit

# Configure Ethernet 1/0/4 as a network port.

[SwitchB] interface ethernet 1/0/4
[SwitchB-Ethernet1/0/4] mac-forced-forwarding network-port

# Configure Ethernet 1/0/4 as a DHCP snooping trusted port.

[SwitchB-Ethernet1/0/4] dhcp-snooping trust no-user-binding
[SwitchB-Ethernet1/0/4] quit

# Configure Ethernet 1/0/6 as a network port.

[SwitchB] interface ethernet 1/0/6
[SwitchB-Ethernet1/0/6] mac-forced-forwarding network-port

# Configure Ethernet 1/0/6 as a DHCP snooping trusted port.

[SwitchB-Ethernet1/0/6] dhcp-snooping trust

<SwitchC> system-view
[SwitchC] stp enable