Use the following procedure to enable or disable DHCP snooping on the VLAN.
You must enable DHCP snooping separately for each Vlan ID.
If you disable DHCP snooping on a VLAN, the switch forwards DHCP reply packets to all applicable ports, whether the port is trusted or untrusted.
From the Device Physical View, select a port.
From the navigation tree, double-click Security.
In the Security tree, double-click DHCP Snooping.
In the work area, click the DHCP Snooping-VLAN tab.
To select a VLAN to edit, click the VLAN ID.
In the VLAN row, double-click the cell in the DhcpSnoopingEnabled column.
Select a value from the list—true to enable DHCP snooping for the VLAN, or false to disable DHCP snooping for the VLAN.
In the VLAN row, double-click the cell in the VlanOption82Enabled column.
Select a value from the list—true to enable DHCP snooping with Option 82 for the VLAN, or false to disable DHCP snooping with Option 82 for the VLAN.
On the toolbar, click Apply.