This setting controls whether the DHCP Relay Agent adds Option 82 (circuit identifier) information to DHCP requests forwarded from this VLAN, with the object turned on to insert that data or off to leave DHCP packets unmodified. Admins enable Option 82 when they need downstream DHCP servers to know which physical circuit or VLAN a client's request originated from, often for location-based address assignment or access control. For example, an ISP might enable this on a subscriber VLAN so its DHCP server can hand out addresses based on which access line the request came in on.