D-Link DGS-3000 Reference Manual page 239

DGS-3000 Series Layer 2 Managed Gigabit Ethernet Switch CLI Reference Guide
Format
config dhcp_relay option_61 delete [mac_address <macaddr> | string <multiword 255> | all]
Parameters
mac_address - The entry with the specified MAC address will be deleted.
<macaddr> - Enter the MAC address here.
string - The entry with the specified string will be deleted.
<multiword 255> - Enter the string value here. This value can be up to 255 characters long.
all - All rules excluding the default rule will be deleted.
Restrictions
Only Administrators, Operators and Power-Users can issue this command.
Example
To remove a DHCP relay option 61 entry:
DGS-3000-26TC:admin#config dhcp_relay option_61 delete mac_address 00-11-22-33-
44-55
Command: config dhcp_relay option_61 delete mac_address 00-11-22-33-44-55
Success
DGS-3000-26TC:admin#
20-20 show dhcp_relay option_61
Description
This command is used to show all rulers for option 61.
Format
show dhcp_relay option_61
Parameters
None.
Restrictions
None.
Example
To display DHCP relay rulers for option 61:
235