DHCP Snooping
Activating "snooping" will prevent "snooping" of other DHCP servers on your network.
When DHCP Snooping is turned on, DHCP replies are dropped from any port that is not identified as a Trusted Port.
On the switch that has the actual DHCP server, that port that contains the DHCP should be configured as a trusted port.
Finally, DHCP Snooping should be enabled globally for the network and VLANS using it.
ip dhcp snooping (global) ip dhcp snooping trust (interface) ip dhcp snooping vlan (vlan) (interface)	terminal commands
switchDC: DHCP server is gi 5/12 consigure terminal ip dhcp snooping interface gi 5/12 ip dhcp snooping trust ip dhcp snooping vlan 5-8,15	Closet1: uplink to switch dc is on gi 1/1 configure terminal ip dhcp snooping interface gi 1/1 ip dhcp snooping trust ip dhcp snooping vlan 5-6