Patent ID: 7849168

Claim:
A network switching apparatus for connecting a first server and a second server, comprising: a plurality of ports connectable to either the first server or the second server; a collective setting changing unit for changing settings of the plurality of ports in accordance with setting information designated to the plurality of ports, using a server migration process to perform migration of the first server to the second server via a migration destination virtual server; a virtualization route control mechanism unit for controlling a route of an input packet in accordance with a virtual address, wherein the virtual address is for virtualizing network addresses of the first server and the second server; and a destination table having; a port number of each of the ports, the virtual address, a physical address which is not virtualized, a first output rewrite rule corresponding to a first rewrite condition for a transmission destination address contained in the packet, a second output rewrite corresponding to a second rewrite condition for a transmission source address contained in the packet, wherein the virtualization route control mechanism unit rewrites the transmission destination address contained in the packet in accordance with the destination table, and wherein the virtualization route control mechanism unit rewrites the transmission source address contained in the packet in accordance with the destination table, wherein the virtualization route control mechanism unit searches the destination table for a virtual address corresponding to a destination address of a packet that arrived at the network switching apparatus, and outputs, when there is a virtual address corresponding to the destination address of the packet, the packet to a port having a port number of the virtual address.