Installation Manual

INS_RLXE4GE24MODMS_REV– 20 Dec 2017 PAGE 36
INSTALLATION AND OPERATION MANUAL RLXE4GE24MODMS
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DHCP Relay Configuration
Configure DHCP Relay on this page.
Label Description
Relay Mode Indicates the DHCP relay mode operation.
Possible modes are:
Enabled: 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.
Disabled: Disable DHCP relay mode operation.
Relay Server Indicates the DHCP relay server IP address. 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.
Relay Information Mode 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.