Nec Corporation

Tetsuo Imai

Soichiro Araki

Tomoyoshi Sugawara

Norihito Fujita

Yoshihiko Suemura

Norito Fujita

To eliminate interruption of a service used by a user and reset of communication caused by switching of an operating server such as a process migration or the like. On receiving a session migration start request, server/network cooperation control meansissues an operating server-switching control start notification to an operating server switching control means(step S). On receiving the operating server switching control start notification, the operating server switching control meansswitches an operating server. Next, on receiving an operating server switching control completion notification, the server/network cooperation control meanssends a connection destination target network-switching request to a connection control means(step S). The connection control meansswitches the connection destination target network of the user corresponding to a user name whose connection destination target network is to be switched, from a target network including a main server to a switch destination target network including a backup server (step S).

Method of migrating processes between networks and network system thereof

Disclosed is a network system comprising: a plurality of routersandconnected to each other through a network; pseudo redundant configuration setting meansandwhich are connected respectively to the routers and which perform a communication using a redundancy protocol with respective routers; and association control meansconnected to the pseudo redundant configuration setting meansand, wherein when a serveris a backup server and its backup state needs to be maintained, the pseudo redundant configuration setting meansissues a signal for maintaining a standby state to the router, and when servers are switched between a standby state and operating state, the association control meanstransmits a switching instruction for switching between a standby state and operating state to the pseudo redundant configuration setting meansand

System using pseudo redundant configurator to switch network devices between operating and standby states

Apparatus for designing a virtual VLAN network includes a database representing a plurality of VLAN networks in a spanning tree topology, each of the networks being formed of a plurality of VLAN member nodes interconnected by links. In response to a network configuration request from a communications network, control circuitry determines the costs of the links, and then determines the least cost unicast paths by using a shortest path algorithm. A search is made through the least cost unicast paths for detecting a loop. If at least one loop is detected, a link of highest cost of the loop is blocked. All unicast paths of the blocked link are reestablished through links that circumvent the blocked link. A spanning tree built up with all the links accommodating the least cost unicast paths is established. Configuration command is sent to the network for configuring it according to the established spanning tree.

Growing community of inventors

Tokyo, Japan

Tetsuo Imai