TP-Link T2500G-10MPS T2500G-10MPSUN V1 Configuration Guide - Page 610
Switch#con Switchconfig#interface gigabitEthernet
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Configuring Network Security DHCP Snooping Configuration Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 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. ip dhcp snooping information option Enable the Option 82 feature on the port. ip dhcp snooping information strategy { keep | replace | drop } Specify the operation for the Option 82 field of the DHCP request packets from the Host. The following options are provided: keep: Indicates keeping the Option 82 field of the packets. replace: Indicates replacing the Option 82 field of the packets with one defined by switch. By default, the Circuit ID is defined to be the VLAN and the number of the port which receives the DHCP Request packets. The Remote ID is defined to be the MAC address of the DHCP Snooping device which receives the DHCP Request packets. drop: Indicates discarding the packets that include the Option 82 field. ip dhcp snooping information circuit-id string Configure the circuit ID. The circuit ID configurations of the switch and the DHCP server should be compatible with each other. string: Enter the circuit ID, which contains up to 64 characters. ip dhcp snooping information remote-id string Configure the remote ID. The remote ID configurations of the switch and the DHCP server should be compatible with each other. string: Enter the remote ID, which contains up to 64 characters. show ip dhcp snooping information interface { fastEthernet port | gigabitEthernet port | port-channel port-channel-id } Verify the Option 82 configuration of the port. end Return to privileged EXEC mode. copy running-config startup-config Save the settings in the configuration file. The following example shows how to enable Option 82 on port 1/0/7 and configure the strategy as replace, the circuit-id as VLAN20 and the remote-id as Host1: Switch#configure Switch(config)#interface gigabitEthernet 1/0/7 Switch(config-if)#ip dhcp snooping information option Configuration Guide 583
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