System for switching between communication devices, switching method, and switching program

摘要

A switching system in which a unique additional address is used for each session, and session information is transferred as it is without rewriting the session information when a communication device such as a server is switched, a switching method, and a switching program are disclosed. The switching system comprises a switching device (210) for selecting an address for each session from a first communication device, attaching the address to a packet from the first communication device in place of a destination address of the packet, and sending the packet, a dispatcher (240) for setting up a session with the first communication device, selecting a server to deal with the request from the first communication device, and transferring the set up session to a second communication device, and servers (250-1, . . . , 250-n) for taking over the session transferred by the dispatcher and dealing with the request from the first communication device.

主权项

1. A dispatcher comprising a session setup section to set up, when a packet destined for a specified address is a request for new session, a session with a first communication device being a source of a packet, a session information rewriting section to select an address to be assigned to the setup session from unused addresses and to provide the selected address to a converting table, and a session transferring section to transfer said setup session and the selected address to a second communication device,
wherein the selected address is deleted after the setup session is transferred to the second communication device, and wherein said session transferring section provides, when a session between said second communication device and said first communication device is terminated, an instruction for deletion of an entry corresponding to said session.