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DHCP snooping configuration example
Network requirements
As shown in Figure 303, a DHCP snooping device (Switch B) is connected to a DHCP server through
GigabitEthernet 1/0/1, and to DHCP clients through GigabitEthernet 1/0/2 and GigabitEthernet
1/0/3.
• Enable DHCP snooping on Switch B and configure DHCP snooping to support Option 82.
Configure the handling strategy for DHCP requests containing Option 82 as replace.
• Enable GigabitEthernet 1/0/1 to forward DHCP server responses; disable GigabitEthernet 1/0/2
and GigabitEthernet 1/0/3 from forwarding DHCP server responses.
• Configure Switch B to record clients’ IP-to-MAC address bindings in DHCP-REQUEST messages and
DHCP-ACK messages received from a trusted port.
Figure 303 Network diagram
Configuring Switch B
1. Enable DHCP snooping:
a. Select Network > DHCP from the navigation tree.
b. Click the DHCP Snooping tab.
c. Select the Enable option next to DHCP Snooping to enable DHCP snooping.
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