Hitachi, Ltd.

Yoshiyuki Kurosaki

Shigeru Miyake

Satoshi Miyazaki

Minoru Koizumi

Toshiaki Hirata

Osamu Takada

Tomoichi Ebata

Satoru Tezuka

Masatoshi Takihiro

Koji Tsukada

Tomohiro Morisada

A network management system for managing a computer network in which media switching type infrastructures and media sharing type infrastructures are combined coexistently includes a database destined for network management in which correspondences established among information concerning physical interconnections of individual equipment on the network, information concerning logical network configuration such as that of virtual network, and information concerning the users who make use of the network are stored, identifying devices for identification of the individual equipment on the network and physical addresses intrinsic to network ports, respectively, and retrieval engines for searching information of the physical addresses of the network ports with queries for the logical addresses.

Virtual network displaying system

A network system having a plurality of interconnected networks each having a policy server. The policy server sets a quality-guaranteed path in the network according to a policy held in the policy server. The policy server includes: a policy holding unit to hold a policy defining a quality that can be guaranteed in its own network, or local network, for an inter-network communication; a policy publicizing unit to make public the policy held in the policy holding unit to the policy servers of other networks; a guaranteed quality calculation unit to calculate, from a policy publicized by a policy server of a network on a path between the local network and other network, a quality that can be guaranteed for the path between the local network and the other network; and a quality-guaranteed path setting unit to provide a quality-guaranteed path, the quality-guaranteed path having a guaranteed quality within the quality calculated by the guaranteed quality calculation unit for the path between the local network and the other network.

Network system having plural networks for performing quality guarantee among the networks having different policies

Growing community of inventors

Fujisawa, Japan

Yoshiyuki Kurosaki