Dell PowerConnect 5524P User Manual page 570

VLAN Settings
To separate ports in a VLAN, enable DHCP snooping on it.
Before you enable DHCP snooping on a VLAN, you must globally enable
DHCP snooping on the device.
When DHCP snooping is disabled for a VLAN, the Binding entries that were
collected for that VLAN are removed from the Binding database.
To enable/disable DHCP snooping on a VLAN:
1 Click Switching > DHCP Snooping > VLAN Settings in the tree view to
display the VLAN Settings page.
Figure 19-2. VLAN Settings
The list of existing VLANs are displayed in the VLAN ID list.
2 Click Add to move the VLANs, for which you want to enable DHCP
snooping, from the VLAN ID list to the Enabled VLANs list. To remove a
VLAN, click Remove to move it from the Enabled VLANs list to the
VLAN ID list.
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Dell PowerConnect 55xx Systems User Guide