Cisco WS-C3560E-48PD-SF Command Reference - Page 184

ip dhcp snooping verify Chapter 2 Catalyst 3560 Switch Cisco IOS Commands ip dhcp snooping verify Use the ip dhcp snooping verify global configuration command to configure the switch to verify on an untrusted port that the source MAC address in a DHCP packet matches the client hardware address. Use the no form of this command to configure the switch to not verify the MAC addresses. ip dhcp snooping verify mac-address no ip dhcp snooping verify mac-address Syntax Description This command has no arguments or keywords. Defaults The switch verifies the source MAC address in a DHCP packet that is received on untrusted ports matches the client hardware address in the packet. Command Modes Global configuration Command History Release 12.2(20)SE Modification This command was introduced. Usage Guidelines In a service-provider network, when a switch receives a packet from a DHCP client on an untrusted port, it automatically verifies that the source MAC address and the DHCP client hardware address match. If the addresses match, the switch forwards the packet. If the addresses do not match, the switch drops the packet. Examples This example shows how to disable the MAC address verification: Switch(config)# no ip dhcp snooping verify mac-address You can verify your settings by entering the show ip dhcp snooping privileged EXEC command. Related Commands Command show ip dhcp snooping Description Displays the DHCP snooping configuration. 2-152 Catalyst 3560 Switch Command Reference 78-16405-05