Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
ip dhcp snooping informati on option a llow-untr usted
ip dhcp snooping informat ion option allow-untru sted
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.
ip dhcp snooping information option allow-u ntrus ted
no ip dhcp snooping information option allow-untrusted
Syntax Description This command has no arguments or keywo rds.
Defaults D HCP packets with option 82 are not allowed on snooping untrusted ports.
Command Modes Global c onfiguratio n mode
Examples This 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 Description
ip dhcp snooping Globally enables DHCP snooping.
ip dhcp snooping information option E nables DHCP option 82 data insertion.
ip dhcp snooping limit rate Configures the number of the DHCP messages th at an
interface can receive per second.
ip dhcp snooping trust E nables DHCP snooping on a trusted VLAN.
ip dhcp snooping vlan Enables DHCP snooping on a VLAN or a group o f VLANs.
show ip dhcp s nooping Displays t he DHCP snooping configur ation.
show ip dhcp snooping binding Displays the DHCP snooping binding entrie s.