Patent ID: 8780900

Claim:
A crossbar switch system comprising crossbar switches, arranged in multiple stages, that form paths that connect each unit in a computer, each of the crossbar switches including an issuing unit that creates and issues, when a packet is input, a history collection packet that is used to collect historical information on the packet; a collecting unit that collects historical information related to transferring the input packet; an embedding unit that embeds, in the history collection packet that is issued by the issuing unit or in a history collection packet that is transferred from a crossbar switch in a previous stage, the historical information collected by the collecting unit; a storage space that stores therein historical information; and a transferring unit that transfers, if a transfer destination of a packet is other than the crossbar switches, to the transfer destination, only an original packet in which the historical information is deleted after storing in the storage space the historical information that is embedded in the history collection packet and that transfers, if the transfer destination is a crossbar switch, to a crossbar switch in a next stage, the history collection packet.