D-Link DGS-3000 Reference Manual page 227

DGS-3000 Series Layer 2 Managed Gigabit Ethernet Switch CLI Reference Guide
Parameters
state - (Optional) When the state is enabled, the DHCP packet will be inserted with the option 82
field before being relayed to server. The DHCP packet will be processed based on the
behaviour defined in check and policy setting. When the state is disabled, the DHCP packet
will be relayed directly to server without further check and processing on the packet. The
default setting is disabled.
enable - Specify that the option 82 processing will be enabled.
disable - Specify that the option 82 processing will be disabled.
check - (Optional) When the state is enabled, For packet come from client side, the packet
should not have the option 82's field. If the packet has this option field, it will be dropped. The
default setting is disabled.
enable - Specify that checking will be enabled.
disable - Specify that checking will be disabled.
policy - (Optional) Specify the policy used. This option takes effect only when the check status is
disabled. The default setting is set to 'replace'.
replace - Specify to replace the existing option 82 field in the packet. The Switch will use it's
own Option 82 value to replace the old Option 82 value in the packet.
drop - Specify to discard if the packet has the option 82 field. If the packet, that comes from
the client side, contains and Option 82 value, then the packet will be dropped. If the
packet, that comes from the client side doesn't contain an Option 82 value, then insert it's
own Option 82 value into the packet.
keep - Specify to retain the existing option 82 field in the packet. If the packet, that comes
from the client side, contains and Option 82 value, then keep the old Option 82 value. If the
packet, that comes from the client side, doesn't contain an Option 82 value, then insert it's
own Option 82 value into the packet.
remote_id - (Optional) Specify the content in Remote ID suboption.
default - Uses switch's system MAC address as remote ID.
user_define - Uses user-defined string as remote ID. The space character is allowed in the
string.
<desc 32> - Enter the user defined description here. This value can be up to 32 characters
long.
Restrictions
Only Administrators, Operators and Power-Users can issue this command.
Example
To configure DHCP relay option 82:
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