The nature of the last error. Provides interpretation context for mplsTunnelErrorProtocolCode and mplsTunnelErrorProtocolSubcode. A value of noError (0) shows that there is no error associated with this tunnel and means that the other objects in this table entry have no meaning. A value of unknown (1) shows that there is an error but that no additional information about the cause is known. The error may have been received in a signaled message or generated locally. A value of protocol (2) or pathComputation (3) indicates that the cause of an error and identifies an error that has been received through signaling or will itself be signaled. A value of localConfiguration (4), localResources (5) or localOther (6) identifies an error which has been detected by the local node, but which will not be reported through signaling.