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335

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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