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# 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
4. Configure Switch B
# 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
5. Configure Switch C
# Enable STP.
<SwitchC> system-view
[SwitchC] stp enable
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