Abstract: A network system includes: a VXLAN region that is connected to a vEPC virtual network and in which encapsulation by VXLAN is performed; a PBB region in which encapsulation by PBB is performed; an edge router that belongs to the VXLAN region and is connected to an edge switch in the PBB region; and an edge switch that belongs to the PBB region and is connected to the edge router. The edge router performs conversion between a VNID of data encapsulated by the VXLAN and an intermediate CVID of decapsulated data exchanged with the edge switch, and the edge switch performs conversion between an ISID of data encapsulated by the PBB and the intermediate CVID.

Abstract: When IGMP packets are relayed to a predetermined router (L3SW), first and second L2SWs update their own snooping tables by snooping. Also, the first L2SW acquires a correspondence relation retained in the snooping table of the second L2SW through a control plane and registers it to the snooping table of the first L2SW. Then, when the first L2SW receives a multicast packet whose destination is a multicast group, the first L2SW extracts corresponding IP addresses based on its own snooping table and converts the multicast packet into unicast packets whose destinations are the IP addresses.

Abstract: A controller of a tag conversion apparatus configured holds tag conversion information associating addresses of communication apparatuses and information on tags of tagging schemes for network separation, analyzes a frame input from one of the plurality of ports and determine a current tagging scheme of the frame, determines a tagging scheme associated with a destination address of the frame based on the tag conversion information, and converts the frame to a frame of the tagging scheme associated with the destination address based on the tag conversion information when the tagging scheme associated with the destination address and the current tagging scheme are different.

Abstract: A network system includes: a VXLAN region that is connected to a vEPC virtual network and in which encapsulation by VXLAN is performed; a PBB region in which encapsulation by PBB is performed; an edge router that belongs to the VXLAN region and is connected to an edge switch in the PBB region; and an edge switch that belongs to the PBB region and is connected to the edge router. The edge router performs conversion between a VNID of data encapsulated by the VXLAN and an intermediate CVID of decapsulated data exchanged with the edge switch, and the edge switch performs conversion between an ISID of data encapsulated by the PBB and the intermediate CVID.

Abstract: A communication apparatus for transmitting and receiving data is configured to: store assertion information in which a failure detection condition is registered, the failure detection condition including information for identifying data that is not to be received during normal operation; refer to the assertion information when data has been received from another communication apparatus; judge whether or not the received data satisfies the failure detection condition registered in the assertion information; and detect a failure when it is judged that the received data satisfies the failure detection condition registered in the assertion information.

Abstract: A controller of a tag conversion apparatus configured holds tag conversion information associating addresses of communication apparatuses and information on tags of tagging schemes for network separation, analyzes a frame input from one of the plurality of ports and determine a current tagging scheme of the frame, determines a tagging scheme associated with a destination address of the frame based on the tag conversion information, and converts the frame to a frame of the tagging scheme associated with the destination address based on the tag conversion information when the tagging scheme associated with the destination address and the current tagging scheme are different.

Abstract: A first L2SW acquires a correspondence relation between a multicast group and a representative IP address retained in a snooping table of a second L2SW through a control plane, and registers the correspondence relation to a snooping table of the first L2SW. When the first L2SW receives a multicast packet whose destination is a multicast group, the first L2SW extracts a corresponding representative IP address of the other L2SW based on the snooping table of the first L2SW, and converts the multicast packet into a unicast packet whose destination is the extracted representative IP address. When the destination representative IP address contained in the unicast packet is its own representative IP address, the second L2SW converts the unicast packet into multicast packets.

Abstract: A typical network setting control device according to the present invention can be configured by a control device which includes an input device, an output device, a storage device, and a processing device and is connected to at least one communication device through a network. The control device performs network setting in the communication device on the basis of network setting data. The processing device creates a setting procedure of network setting. The setting procedure of the network setting is determined on the basis of the network setting data and an existing network configuration.

Abstract: When IGMP packets are relayed to a predetermined router (L3SW), first and second L2SWs update their own snooping tables by snooping. Also, the first L2SW acquires a correspondence relation retained in the snooping table of the second L2SW through a control plane and registers it to the snooping table of the first L2SW. Then, when the first L2SW receives a multicast packet whose destination is a multicast group, the first L2SW extracts corresponding IP addresses based on its own snooping table and converts the multicast packet into unicast packets whose destinations are the IP addresses.

Abstract: A first L2SW acquires a correspondence relation between a multicast group and a representative IP address retained in a snooping table of a second L2SW through a control plane, and registers the correspondence relation to a snooping table of the first L2SW. When the first L2SW receives a multicast packet whose destination is a multicast group, the first L2SW extracts a corresponding representative IP address of the other L2SW based on the snooping table of the first L2SW, and converts the multicast packet into a unicast packet whose destination is the extracted representative IP address. When the destination representative IP address contained in the unicast packet is its own representative IP address, the second L2SW converts the unicast packet into multicast packets.

Abstract: A ring network with plural network relay devices connected in a ring shape includes first and second control ports to be transitioned into either a forwarding state that permits relaying information, or a blocking state that prohibits relaying information; and a ring protocol control unit for transmitting connection confirmation information indicative of communications being possible between the first and the second control port, from the first to the second control port, and from the second to the first control port at a predetermined time interval, or for, in the event that the first or the second control port does not receive the connection confirmation information from the second or the first control port, transmitting failure information indicative of communications being not possible between the first and the second control port, from the first to the second control port, or from the second to the first control port.

Abstract: A ring network with plural network relay devices connected in a ring shape includes first and second control ports to be transitioned into either a forwarding state that permits relaying information, or a blocking state that prohibits relaying information; and a ring protocol control unit for transmitting connection confirmation information indicative of communications being possible between the first and the second control port, from the first to the second control port, and from the second to the first control port at a predetermined time interval, or for, in the event that the first or the second control port does not receive the connection confirmation information from the second or the first control port, transmitting failure information indicative of communications being not possible between the first and the second control port, from the first to the second control port, or from the second to the first control port.