OPTICAL SYSTEMS DESIGN
DOC ID: 10118101
OSD2512 OPERATOR MANUAL
PAGE 60
DHCP RELAY CONFIGURATION
Configuration
DHCP
Relay
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.
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.
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.
Relay Information Policy
