Nec Corporation

Fei Gao

Takahiro Oshima

Yuji Yokoyama

An adjacent domain specification meansspecifies an adjacent controller domain to an own controller domain. A loop solution meanscreates a communication tree for avoiding a loop configuration present in communication paths with the adjacent controller domain. A topology specification meansspecifies a network topology between the controller domains. A communication control meanscalculates an optimum path based on the communication tree by use of the network topology, and controls communication from a communication device connected to each OpenFlow switch.

Communication control system, communication control method, and communication control program

A first control apparatus according to the present invention includes: a first receiving unit which receives a second message from any one of switch apparatuses of an OpenFlow network which is a connection path connecting a terminal apparatus with a communication destination apparatus; a first receiving packet processing unit which processes the second message; a first application executing unit which executes a first application corresponding to the second message; a first message generating unit which receives messages from the first receiving packet processing unit and the first application executing unit, and generates a first message; a first message receiving unit which receives a first message from another first control apparatus; a first determination unit which selects the first message received from the first message generating unit or the first message received from the first message receiving unit; and a first sending unit which sends the selected first message.

Control apparatus, control method and medium

The controller sets control information in a switch over a control channel to control the switch. The switch includes a packet processing unit that processes a packet received based on control information as set from the controller, and a Layer-2 forwarding unit that learns an input port of a control packet between the controller and a neighboring switch or switches and that forwards the control packet on the basis of learned results. The switch also includes an alternative control channel construction unit that, on detecting a disconnection of the control channel, sends a packet requesting a resolution of a Layer-2 address of the controller to the neighboring switch or switches. The alternative control channel construction unit acquires the Layer-2 address from the controller via the neighboring switch or switches and transmits the control packet to the controller using the Layer-2 address acquired to construct a second control channel between the switch and the controller.

Communication system, switch, controller, method for constructing a control channel and program

In an open flow network, a load of a switch on a secure channel network when a controller maintains and updates a physical topology of the switch in the situation that a network among the switches is in a high delay state. More specifically, the controller sets a flow entry having a rule and an action defined to uniformly control a packet as a flow to each of a plurality of switches. The controller sets to each switch, a circulation flow entry to be deleted when a circulation packet which is mutually transmitted and received among the switches gets not to arrive. Then, when receiving a notice that the circulation flow entry has been deleted, from each switch, the controller detects a failure among the switches.

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Tokyo, Japan

Fei Gao