Abstract: A multiplex router device, having a multiplex configuration, is instrumental in reducing internal and external traffic flows for a routing protocol process that occurs at a time of system switchover. A data base integration module, in a route calculation unit in the active mode, stores network link-state information collected by a routing protocol packet transmission-reception module in a link-state data base, and at the same time sends the information to a route calculation unit, but does not send routing protocol information collected. In the route calculation unit in the standby mode, a data base integration module that received the network link-state information stores its contents into its own link-state data base. When a failure occurs in the route calculation unit in the active mode, the route calculation unit performs the routing protocol process by using the stored link-state data base.

Abstract: An optical information recording medium, which is not deteriorated after repeated reading out and writing in operations, is provided by forming a glass thin film, which varies the intensity or the intensity distribution of light, on a substrate, and providing a recording film, a protective film, and a reflecting film thereon.