DHCP Snooping in Cisco Switch

– By default all ports are untrusted when feature is enabled

ip dhcp shooping
ip dhcp snooping database flash:/snoopy.db
ip dhcp shooping vlan 18
interface GigabitEthernet1/0/33
 ip dhcp snooping limit rate 10
 ip dhcp snooping trust

show ip dhcp snooping
show ip dhcp shooping binding
more flash:/snoopy.db