D-Link DGS-6600-48T Product Manual - Page 257

DGS-6604 ip dhcp relay information option ip dhcp relay information option Use this command to enable the insertion of the relay agent information option (option 82). Use the no form of the command to disable this function. ip dhcp relay information option no ip dhcp relay information option Syntax None Default Disabled Command Mode Usage Guideline Circuit ID suboption format: Global configuration Use this command to enable insertion of DHCP option 82. When the DHCP 82 option is enabled, a DHCP packet received from a client will have the option 82 field inserted before being relayed to the server. The DHCP option 82 contains 2 suboptions: circuit ID and remote ID sub-options. If the switch is standalone then the module field, within the circuit ID suboption, is always set to zero. The following describes the format of the Circuit and Remote ID suboption formats: Byte Field Value Remote ID suboption format: 1 Sub-option Type 2 Length 3 Circuit IDType 4 Length 5 6 VLAN ID 7 8 Module # Port # 1 6 0 4 X X X VLAN ID - The incoming VLAN ID of DHCP client packet. Module # - For a standalone switch, Module # is always 0; For a stackable switch, Module is Unit ID. Port # - The receiving port number of DHCP client packet, port number starts from 1. Byte 1 2 3 4 5 6 7 8 9 10 Field Sub-option Type Length Remote ID Type Length MAC Address Value 2 8 0 6 M1 M2 M3 M4 M5 M6 MAC address: the switch's system MAC address. CLI Reference Guide 247