Quick Reference Guide

170 DHCP Snooping
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DELL CONFIDENTIAL – PRELIMINARY 5/15/12 – FOR PROOF ONLY
Default Configuration
The default configuration is disabled.
Command Mode
Global Configuration mode.
User Guidelines
• You must first globally enable DHCP snooping before enabling DHCP snooping on a VLAN.
Example
The following example enables DHCP snooping on VLAN 1000:
ip dhcp snooping trust
The ip dhcp snooping trust Interface Configuration (Ethernet, Port-channel) mode command
configures a port as trusted for DHCP snooping purposes. Use the no form of this command to
return to the default settings.
Syntax
• ip dhcp snooping trust
• no ip dhcp snooping trust
Default Configuration
The default configuration is that the interface is not trusted.
Command Mode
Interface Configuration (Ethernet, Port-channel) mode.
User Guidelines
• Configure as trusted ports those that are connected to a DHCP server or to other switches or
routers. Configure as untrusted ports those that are connected to DHCP clients.
Example
The following example configures Ethernet port 1/e15 as trusted for DHCP snooping purposes.
console(config)# ip dhcp snooping vlan 1000
console(config)# interface ethernet 1/e15
console(config-if)# ip dhcp snooping trust