Abstract: A Peripheral Component Interconnect (PCI) Express switch is provided. The PCI Express switch includes a first routing information bus connected to the first port; a second routing information bus connected to the second port; a third routing information bus connected to the third port; two routing slaves in the first port, each dedicated to listening to one of the second and the third routing information buses; two routing slaves in the second port, each dedicated to listening to one of the first and the third routing information buses; and two routing slaves in the third port, each dedicated to listening to one of the first and the second routing information buses.