A stpxRootInconsistencyUpdate notification is sent by a bridge when an instance of stpxRootInconsistencyState is created or destroyed. That is, when an root-inconsistency is discovered in the VLAN's or instance's Spanning Tree for a particular port, or when such an root-inconsistency disappears. For creation, the value of stpxRootInconsistencyState in the notification is true(1); for deletion, the value is false(2). The object value of stpxSpanningTreeType indicates which Spanning Tree protocol is running when an instance of stpxRootInconsistencyState is created or destroyed.