11-1.3 DHCP Relay Configuration
Navigate to the Switch > DHCP > Relay menu path to display the DHCP Relay Configuration table. Here
you can configure the DHCP Relay function.
A DHCP relay agent is used to forward and to transfer DHCP messages between the clients and the
server when they are not in the same subnet domain. It stores the incoming interface IP address in the
GIADDR field of the DHCP packet. The DHCP server can use the value of GIADDR field to determine the
assigned subnet. For such condition, please make sure the switch configuration of VLAN interface IP
address and PVID(Port VLAN ID) correctly.
Parameters:
Relay Mode: Select on or off. The default is off. Indicates the DHCP relay mode operation. Possible
modes are:
On: Enable DHCP relay mode operation. When DHCP relay mode operation is enabled, the agent
forwards and transfers DHCP messages between the clients and the server when they are not in
the same subnet domain. And the DHCP broadcast message won't be flooded for security
considerations.
Off: Disable DHCP relay mode operation.
Relay Server: Enter the DHCP Relay server IP address.
Relay Information Mode: Select on or off. The default is off. Indicates the DHCP relay information
mode option operation. The option 82 circuit ID format as "[vlan_id][module_id][port_no]". The first
four characters represent the VLAN ID, the fifth and sixth characters are the module ID(in standalone
device it always equal 0, in stackable device it means switch ID), and the last two characters are the port
number. For example, "00030108" means the DHCP message receive form VLAN ID 3, switch ID 1, port
No 8. And the option 82 remote ID value is equal the switch MAC address. Possible modes are:
Enabled: Enable DHCP relay information mode operation. When DHCP relay information mode
operation is enabled, the agent inserts specific information (option 82) into a DHCP message
when forwarding to DHCP server and removes it from a DHCP message when transferring to
DHCP client. It only works when DHCP relay operation mode is enabled.
Disabled: Disable DHCP relay information mode operation.
Relay Information Policy: At the dropdown, select Replace, Keep, or Drop. Indicates the DHCP relay
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