A networking system having a first slot interface access device, a second slot interface access device, and other slot interface access device, each having a physical slot, a slot interface and a slot control module, wherein said first slot interface access device and said second interface access device respectively comprise: an input and output control module; a slot management module; and a physical slot to virtual slot contrast table, wherein the slot management module, the slot control module, and the physical slot to virtual slot contrast table are provided between the input and output control module and the slot interface which resides in a layer lower than a layer where the input and output control module resides, the input and output control module is adapted to access the slot interface of said other slot interface access device using virtual slot identification information, the slot management module is adapted to convert the virtual slot identification information into physical slot identification information by referring to the physical slot to virtual slot contrast table, and access the slot control module of said other slot interface access device corresponding to the physical slot identification information, thereby realizing a physical access of the input and output control module to the slot interface of said other slot interface access device, and wherein the second slot interface access device acts as a substitute for the first slot interface access device if the first slot interface access device malfunctions, and having a higher CPU capability than CPU capabilities of the other slot interface access device. an input and output control module; a slot management module; and a physical slot to virtual slot contrast table, wherein the slot management module, the slot control module, and the physical slot to virtual slot contrast table are provided between the input and output control module and the slot interface which resides in a layer lower than a layer where the input and output control module resides, the input and output control module is adapted to access the slot interface of said other slot interface access device using virtual slot identification information, the slot management module is adapted to convert the virtual slot identification information into physical slot identification information by referring to the physical slot to virtual slot contrast table, and access the slot control module of said other slot interface access device corresponding to the physical slot identification information, thereby realizing a physical access of the input and output control module to the slot interface of said other slot interface access device, and wherein the slot management module, the slot control module, and the physical slot to virtual slot contrast table are provided between the input and output control module and the slot interface which resides in a layer lower than a layer where the input and output control module resides, the input and output control module is adapted to access the slot interface of said other slot interface access device using virtual slot identification information, the slot management module is adapted to convert the virtual slot identification information into physical slot identification information by referring to the physical slot to virtual slot contrast table, and access the slot control module of said other slot interface access device corresponding to the physical slot identification information, thereby realizing a physical access of the input and output control module to the slot interface of said other slot interface access device, and wherein the second slot interface access device acts as a substitute for the first slot interface access device if the first slot interface access device malfunctions, and having a higher CPU capability than CPU capabilities of the other slot interface access device.