Cisco Catalyst 4500 Series Configuration Manual page 365

Chapter 2
ip dhcp snooping information option allow-untrusted
To allow DHCP packets with option 82 data inserted to be received from a snooping untrusted port, use
the ip dhcp snooping information option allow-untrusted command. To disallow receipt of these
DHCP packets, use the no form of this command.
Syntax Description
This command has no arguments or keywords.
Command Default
DHCP packets with option 82 are not allowed on snooping untrusted ports.
Command Modes Global configuration mode
Command History Release
12.2(25)EWA
Examples
The following example shows how to allow DHCP packets with option 82 data inserted to be received
from a snooping untrusted port:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# ip dhcp snooping information option allow-untrusted
Switch(config)# end
Switch#
Related Commands Command
ip dhcp snooping
ip dhcp snooping information option
ip dhcp snooping limit rate
ip dhcp snooping trust
ip dhcp snooping vlan
show ip dhcp snooping
show ip dhcp snooping binding
ip dhcp snooping information option allow-untrusted
no ip dhcp snooping information option allow-untrusted
Modification
This command was introduced on the Catalyst 4500 series switch.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release XE 3.9.xE and 15.2(5)Ex
ip dhcp snooping information option allow-untrusted
Description
Globally enables DHCP snooping.
Enables DHCP option 82 data insertion.
Configures the number of the DHCP messages that an
interface can receive per second.
Enables DHCP snooping on a trusted VLAN.
Enables DHCP snooping on a VLAN or a group of VLANs.
Displays the DHCP snooping configuration.
Displays the DHCP snooping binding entries.
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