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[SwitchB-Ethernet1/0/6] dhcp-snooping trust
Auto-mode MFF configuration example in a ring network
Network requirements
As shown in Figure 141, 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 Gateway. MFF automatic mode is enabled on Switch A and
Switch B.
Figure 141 Network diagram
Configuration procedure
1. Configure Gateway
# Configure the IP address of VLAN-interface 1.
<Gateway> system-view
[Gateway] interface Vlan-interface 1
[Gateway-Vlan-interface1] ip address 10.1.1.100 24
2. Configure the DHCP server
# 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
3. Configure Switch A
# Enable DHCP snooping.
<SwitchA> system-view
[SwitchA] dhcp-snooping
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