Steps to Implement DHCP Snooping

Step 1. Enable DHCP snooping by using the ip dhcp snooping global configuration command

Step 2. On trusted ports, use the ip dhcp snooping trust interface configuration command

Step 3: On untrusted interfaces, limit the number of DHCP discovery messages that can be received using the ip dhcp snooping limit rate packets-per-second interface configuration command

Step 4. Enable DHCP snooping by VLAN, or by a range of VLANs, by using the ip dhcp snooping vlan global configuration command