Interconnection of Fibre Channel switches

A fabric system connects a plurality of fabric groups into a plurality of stages between terminal nodes and performs exchange of variable length frame. The fabric has an assignment signal transmitting portion transmitting an assignment signal fixedly assigned an identifier per port connected to other fabrics, a configuration information transmitting portion transmitting a configuration information indicative of correspondence of identifiers of the fabrics connected to the ports, a retrieval information preparing portion preparing a retrieval information for determining a fabric of transfer destination of the received frame per port and a port number on the basis of the identifier of each fabric and the configuration information, and a transfer destination determining portion determining the transfer destination of the frame on the basis of the retrieval information.