D-Link DGS-1510 Series - DHCP Snooping Commands

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DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide

170

18. DHCP Snooping Commands

18-1 ip dhcp snooping

This command is used to globally enable DHCP snooping. Use the no form of this command to

disable DHCP snooping.

ip dhcp snooping

no ip dhcp snooping

Parameters

None.

Default

By default, this option is disabled.

Command Mode

Global Configuration Mode.

Command Default Level

Level: 12.

Usage Guideline

The DHCP snooping function snoops the DHCP packets arriving at the untrusted interface on the

VLAN that is enabled for DHCP snooping. With this function, the DHCP packets that come from the

untrusted interface can be validated and a DHCP binding database will be constructed for the DHCP

snooping enabled VLAN. The binding database provides IP and MAC binding information that can be

further used by the IP source guard and dynamic ARP inspection process.

Example

This example shows how to enable DHCP snooping.

Switch# configure terminal

Switch(config)# ip dhcp snooping

Switch(config)#

18-2 ip dhcp snooping information option allow-untrusted

This command is used to globally allow DHCP packets with the relay Option 82 on the untrusted

interface. Use the no form of this command to not allow packets with the relay Option 82.

ip dhcp snooping information option allow-untrusted

no ip dhcp snooping information option allow-untrusted