Use the following procedure to specify whether a particular port or multiple ports are trusted or untrusted. Ports are untrusted by default.
From the navigation tree, double-click Security.
In the Security tree, double-click DHCP Snooping.
In the work area, click the DHCP Snooping-port tab.
In the Make Selection section, click the Switch/Stack/Ports ellipsis.
Click a port, a range of ports, or All.
Click Ok.
In the Make Selection section, double-click in the cell under DhcpSnoopingIfTrusted.
Click a value in theDhcpSnoopingIfTrusted list—trusted or untrusted.
In the Make Selection section, double-click in the cell under DhcpSnoopingIfTrusted.
In the DhcpSnoopingIfOption82SubscriberId cell, type a subscriber Id value for the port.
Click Apply Selection.
On the toolbar, click Apply.