Set the Drop Eligible Indicator inserted into the ethernet frame for all management traffic. Only valid when the object sub10UnitMgmtVlanId is set to non zero. The DEI bit is set into the tag control information (TCI) field of each management frame. The DEI is a 1 bit field immediately following the PCP bits (3 bit field) IMPORTANT: This object is controlled by transaction management. Any changes to this object must be transactionally acknowledged following a successful set thus protecting against loss of communication with the unit. To acknowledge the transaction set the object sub10UnitMgmtTransaction to transactionCommit(2).