DHCP Snooping and ARP Inspection Commands
569
FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\CLI Folders\Dell Contax
CLI\files\DHCP_Snooping.fm
D E L L CO N F I D E N T I A L – P R E L I MI N A RY 5/ 1 5 /1 2 - F O R PR O O F O N LY
Syntax
ip dhcp snooping trust
no ip dhcp snooping trust
Default Configuration
The interface is untrusted.
Command Mode
Interface Configuration (Ethernet, Port-channel) mode
User Guidelines
Configure as trusted the ports that are connected to a DHCP server or to
other switches or routers. Configure the ports that are connected to DHCP
clients as untrusted.
Example
The following example configures gigabitethernet port
1/0/
5 as trusted for
DHCP Snooping.
Console(config)#
interface
gigabitethernet 1/0/5
Console(config-if)#
ip dhcp snooping trust
ip dhcp snooping information option allowed-
untrusted
Use the
ip dhcp snooping information option allowed-untrusted
Global
Configuration mode command to allow a device to accept DHCP packets
with option-82 information from an untrusted port. Use the
no
form of this
command to drop these packets from an untrusted port.
Syntax
ip dhcp snooping information option allowed-untrusted
no ip dhcp snooping information option allowed-untrusted