Append vendor requested options algorithm (Kea 1.8.0) get vendor id from query vivso option get vendor id from response vivso option return no vendor id yes get configured option list get option request list (ORO) from query DOCSIS vendor option get configured options in vendor id space push back option code to ORO for each persistent option for each item from configured option list create vivso option for vendor id no response vivso option yes added = false get configured options in vendor id space add sub-option to vivso option added = true first found not found or already found for each item from configured option list yes sub-option is not set in vivso option no add vivso option in response no vivso option in response yes yes added no for each code in ORO