Quick Reference Guide

DHCP Snooping 171
DELL CONFIDENTIAL – PRELIMINARY 5/15/12 – FOR PROOF ONLY
ip dhcp snooping information option allowed-untrusted
The ip dhcp snooping information option allowed-untrusted Global Configuration mode
command configures a switch to accept DHCP packets with option-82 information from an
untrusted port. Use the no form of this command to configure the switch to drop these packets from
an untrusted port.
Syntax
• ip dhcp snooping information option allowed-untrusted
• no ip dhcp snooping information option allowed-untrusted
Default Configuration
The default configuration is to discard DHCP packets with option-82 information from an
untrusted port.
Command Mode
Global Configuration mode.
User Guidelines
There are no user guidelines for this command.
Example
The following example configures a switch to accept DHCP packets with option-82 information
from an untrusted port:.
ip dhcp snooping verify
The ip dhcp snooping verify Global Configuration mode command configures a switch to verify
on an untrusted port that the source MAC address in a DHCP packet matches the client hardware
address. Use the no form of this command to not verify the MAC addresses.
Syntax
• ip dhcp snooping verify
• no ip dhcp snooping verify
Default Configuration
The default configuration is that the switch verifies the source MAC address in a DHCP packet
that is received on untrusted ports matches the client hardware address in the packet.
console(config)#ip dhcp snooping information option allowed-
untrusted