TP-Link T1500-28PCT T1500-28PCTTL-SL2428PUN V3 User Guide - Page 432

Configuring DHCP Service DHCP L2 Relay Configuration 3.1.2 Configuring Option 82 for Ports Choose the menu L3 FEATURES > DHCP Service > DHCP L2 Relay > Port Config to load the following page. Figure 3-2 Configure Option 82 for Ports Follow these steps to enable DHCP Relay and configure Option 82: 1) Select one or more ports to configure Option 82. Option 82 Support Select whether to enable Option 82 or not. Enable it if you want to prevent DHCP client requests from untrusted sources, or assign different IP addresses to clients in different groups from the same DHCP server. Option 82 Policy Select the operation for the switch to take when receiving DHCP packets that include the Option 82 field. Keep: The switch keeps the Option 82 field of the packets. Replace: The switch replaces the Option 82 field of the packets with a new one. The switch presets a default circuit ID and remote ID in TLV (Type, Length, and Value) format. You can also configure the format to include Value only and customize the Value. Drop: The switch discards the packets that include the Option 82 field. Format Specify the packet format for the sub-option fields of Option 82. Normal: Indicates the fields consist of three parts: Type, Length, and Value (TLV). Private: Indicates the fields consist of the value only. User Guide 409