D-Link DGS-1210/ME Series Reference Manual page 153

Restrictions
Example usage:
To disable the DHCP relay option 82 on the Switch:
DGS-1210-28MP/ME:5# config dhcp_relay option_82 state disable
Command: config dhcp_relay option_82 state disable
Success.
DGS-1210-28MP/ME:5#
DGS-1210/ME Metro Ethernet Switch CLI Reference Guide
already exists in the packet received from the DHCP client.
drop − The packet will be dropped if the option 82 field already
exists in the packet received from the DHCP client.
keep − The option 82 field will be retained if the option 82 field
already exists in the packet received from the DHCP client.
remote_id: used to configure the remote id of DHCP relay agent
information option 82 of the Switch.
default – The default value for the remote id.
user_define <desc32> - The remote id which user defined.
user_define_hex <string 246> - The remote id which user defined
with hex.
state: used to configure the state of DHCP relay agent information
option 82 of the Switch.
enable − When this field is toggled to Enabled the relay agent will
insert and remove DHCP relay information (option 82 field) in
messages between DHCP server and client. When the relay agent
receives the DHCP request, it adds the option 82 information, and
the IP address of the relay agent (if the relay agent is configured), to
the packet. Once the option 82 information has been added to the
packet it is sent on to the DHCP server. When the DHCP server
receives the packet, if the server is capable of option 82, it can
implement policies like restricting the number of IP addresses that
can be assigned to a single remote ID or circuit ID. Then the DHCP
server echoes the option 82 field in the DHCP reply. The DHCP
server unicasts the reply to the back to the relay agent if the request
was relayed to the server by the relay agent. The switch verifies that
it originally inserted the option 82 data. Finally, the relay agent
removes the option 82 field and forwards the packet to the switch
port that connects to the DHCP client that sent the DHCP request.
disable − If the field is toggled to disable the relay agent will not
insert and remove DHCP relay information (option 82 field) in
messages between DHCP servers and clients, and the check and
policy settings will have no effect.
Only Administrator, operator or power user-level users can issue this
command.
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