privateVlanDownlinkPorts — Multiple manufacturers; see the original MIB MIB copies (LibreNMS/Observium Community), Edgecore MIB copies (Observium Community)
This is the list of downlink ports for private VLAN. They should not overlap with privateVlanUplinkPorts. Multiple port setting is permitted. 0 will be displayed if the privateVlanStatus is disabled. You must enable the privateVlanStatus before setting this variable.