Enabling DHCPv4 snooping on VLANs

DHCPv4 snooping on VLANs is disabled by default. To enable DHCP snooping on a VLAN or range of VLANs enter this command:

switch(config)# dhcp-snooping vlan <vlan-id-range>

You can also use this command in the vlan context, in which case you cannot enter a range of VLANs for snooping. Below is an example of DHCP snooping enabled on VLAN 4.