Mra switch, computer system using same, and method for changing setting of mra switch

The present invention makes VS bridges movable between different virtual switches and improves the flexibility of the configuration of an MRA switch. This MRA switch compliant with the MR-IOV specification comprises: a plurality of ports to be connected to I/O devices and each having an identifier assigned thereto; one or a plurality of virtual switches (VSs) each having a unique identifier assigned thereto; a plurality of VS bridges constituting the virtual switches and connecting the virtual switches and the ports; and a storage unit that stores the identifiers of the respective virtual switches to which the VS bridges belong. By changing the identifiers of the virtual switches stored in the storage unit by an instruction from outside, the VS bridges can be moved between different virtual switches.