Abstract: A control apparatus includes: a topology management unit that manages a network topology formed by including a plurality of relay apparatuses; a link aggregation group management unit that groups ports of the plurality of relay apparatuses, having a physical link with an arbitrary node of the network topology and manages the grouped ports as a port of a virtual logical link between the plurality of relay apparatuses and the arbitrary node; and a relay apparatus control unit that controls the plurality of relay apparatuses, having the grouped ports, so that, when one of the plurality of relay apparatuses receives a broadcast packet or a multicast packet, a plurality of same packet are not forwarded to the physical links that form the virtual logical link.

Abstract: A control apparatus includes: a topology management unit that manages a network topology formed by including a plurality of relay apparatuses; a link aggregation group management unit that groups ports of the plurality of relay apparatuses, having a physical link with an arbitrary node of the network topology and manages the grouped ports as a port of a virtual logical link between the plurality of relay apparatuses and the arbitrary node; and a relay apparatus control unit that controls the plurality of relay apparatuses, having the grouped ports, so that, when one of the plurality of relay apparatuses receives a broadcast packet or a multicast packet, a plurality of same packet are not forwarded to the physical links that form the virtual logical link.

Abstract: A control apparatus includes: a topology management unit that manages a network topology formed by including a plurality of relay apparatuses; a link aggregation group management unit that groups ports of the plurality of relay apparatuses, having a physical link with an arbitrary node of the network topology and manages the grouped ports as a port of a virtual logical link between the plurality of relay apparatuses and the arbitrary node; and a relay apparatus control unit that controls the plurality of relay apparatuses, having the grouped ports, so that, when one of the plurality of relay apparatuses receives a broadcast packet or a multicast packet, a plurality of same packet are not forwarded to the physical links that form the virtual logical link.

Abstract: A control apparatus includes: a topology management unit that manages a network topology formed by including a plurality of relay apparatuses; a link aggregation group management unit that groups ports of the plurality of relay apparatuses, having a physical link with an arbitrary node of the network topology and manages the grouped ports as a port of a virtual logical link between the plurality of relay apparatuses and the arbitrary node; and a relay apparatus control unit that controls the plurality of relay apparatuses, having the grouped ports, so that, when one of the plurality of relay apparatuses receives a broadcast packet or a multicast packet, a plurality of same packet are not forwarded to the physical links that form the virtual logical link.

Abstract: A network includes a data forwarding node including: a logical network topology management unit managing a correspondence relationship among at least two different logical network topologies generated by applying different policies to a physical network topology and data traffic conditions to which the logical network topologies are applied; and a packet processing unit selecting a logical network topology corresponding to data traffic to which an incoming packet belongs, determining a packet forwarding destination, and transmitting the incoming packet. The data forwarding node selects a logical network and forwards a packet, based on data traffic.

Abstract: A communication system includes, in addition to nodes, a controller for setting, in each node, a processing rule that stipulates a matching rule and processing for a packet matching to the matching rule. Each node processes a received packet in accordance with the processing rule. At least one of the nodes is capable of performing mirroring of a received packet. For a flow satisfying a pre-set condition, the controller sets a processing rule to perform packet mirroring in an arbitrary node, while setting, in a node on a packet capture route reaching a pre-set mirror server, a processing rule that stipulates the processing to forward a mirrored packet.

Abstract: The present invention provides a simulation method for an apparatus which produces refrigeration effect by means of heat exchange between refrigerant and air, wherein the simulation method provides good expandability to allow new parts to be added and so on.

Abstract: There is disclosed a system for modifying a path taken in a transmission network system comprising first and second nodes. The first node routes a signal transmit to a first line to a second line. The second node checks the quality of the first and second lines. After checking that the second line is of good quality, the second node selects the second line. The first node stops entry of signals into the first line. Thus, modification of the path is completed.