TP-Link T2500G-10MPS T2500G-10MPSUN V1 Configuration Guide - Page 608
Configuring DHCP Snooping on Ports, Switchconfig#ip dhcp snooping vlan, Switchconfig-if#end
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Configuring Network Security DHCP Snooping Configuration Switch(config)#ip dhcp snooping vlan 5 Switch(config)#show ip dhcp snooping Global Status: Enable VLAN ID: 5 Switch(config-if)#end Switch#copy running-config startup-config 3.2.2 Configuring DHCP Snooping on Ports Follow these steps to configure DHCP Snooping on the specified ports. Step 1 configure Enter global configuration mode. Step 2 interface { fastEthernet port | range fastEthernet port-list | gigabitEthernet port | range gigabitEthernet port-list | interface port-channel port-channel-id | interface range portchannel port-channel-id-list } Enter interface configuration mode. Step 3 ip dhcp snooping trust Set the port that is connected to the DHCP server as a trusted port. The switch can forward the DHCP packets on the trusted port and discard the DHCP response packets on the distrusted port, so as to ensure that users get proper IP addresses from the legal DHCP server. Step 4 ip dhcp snooping mac-verify Enable the MAC Verify feature. There are two fields in the DHCP packet that contain the MAC address of the host. The MAC Verify feature compares the two fields of a DHCP packet and discards the packet if the two fields are different. This prevents the IP address resource on the DHCP server from being exhausted by forged MAC addresses. Step 5 ip dhcp snooping limit rate value Enable the limit rate feature and specify the maximum number of DHCP messages that can be forwarded on the port per second. The excessive DHCP packets will be discarded. value: Specify the limit rate value. The following options are provided: 0, 5,10,15,20,25 and 30 (packets/second). The default value is 0, which indicates disabling limit rate. Step 6 ip dhcp snooping decline rate value Enable the decline protect feature and specify the maximum number of Decline packets can be forwarded per second on the port. The excessive DHCP Decline packets will be discarded. value: Specify the limit rate value of Decline packets. The following options are provided: 0, 5,10,15,20,25 and 30 (packets/second). The default value is 0, which indicates disabling this feature. Configuration Guide 581
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