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Configuring DHCP snooping
A DHCP snooping enabled device does not work if it is between the DHCP relay agent and DHCP server,
and it can work when it is between the DHCP client and relay agent or between the DHCP client and
server.
Recommended configuration procedure
Task Remarks
Enabling DHCP snooping
Required.
By default, DHCP snooping is disabled.
Configuring DHCP snooping
functions on an interface
Required.
Specify an interface as trusted and configure DHCP snooping to support
Option 82.
By default, an interface is untrusted and DHCP snooping does not support
Option 82.
IMPORTANT:
You need to specify the ports connected to the authorized DHCP servers as
trusted to make sure DHCP clients can obtain valid IP addresses. The trusted
port and the port connected to the DHCP client must be in the same VLAN.
Displaying clients' IP-to-MAC
bindings
Optional.
Display clients' IP-to-MAC bindings recorded by DHCP snooping.
Enabling DHCP snooping
1. Select Network > DHCP from the navigation tree.
2. Click the DHCP Snooping tab to enter the page shown in Figure 255.
You ca
n click Enable or Disable to the right of DHCP Snooping to enable or disable DHCP
Snooping.
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