Abstract: A node apparatus includes a receiving unit receiving a data frame from one of adjacent nodes apparatuses; a storing unit storing an identification information management table in which frame identification information with which the data frame may be uniquely identified, and overlapped data identification information; a processor which performs a process including: judging whether or not a final destination of the received data frame is the node apparatus itself; judging whether or not a registration that matches the frame identification information of the received data frame exists in the identification information management table; judging whether or not the overlapped data identification information of the received data frame and the overlapped data identification information corresponding to the registration match; and discarding the received data frame; and performing a retransmission of the received data frame to another adjacent node that has not been a transmission destination of the data frame.

Abstract: A node apparatus includes a receiving unit receiving a data frame from one of adjacent nodes apparatuses; a storing unit storing an identification information management table in which frame identification information with which the data frame may be uniquely identified, and overlapped data identification information; a processor which performs a process including: judging whether or not a final destination of the received data frame is the node apparatus itself; judging whether or not a registration that matches the frame identification information of the received data frame exists in the identification information management table; judging whether or not the overlapped data identification information of the received data frame and the overlapped data identification information corresponding to the registration match; and discarding the received data frame; and performing a retransmission of the received data frame to another adjacent node that has not been a transmission destination of the data frame.

Abstract: In a multiprocessor system in which a plurality of processors are managed by a management processor, and an access to a shared memory is controlled by a bus control device, the management processor or the bus control device provides to the processors time information synchronized at a time of a system start-up, and each of the processors collects its own running history information associated with the time information. Also, when detecting a fault, each of the processors stops a collection of its own running history information, and stops a collection of running history information of other processors by notifying the fault detection to the other processors. Each of the processors, after having stopped the collection of its own running history information, stores the running history information in a nonvolatile memory provided other than the shared memory.