Patent application number | Description | Published |
20090109841 | Layer-2 Redundancy Protocol Interconnection Device - Interconnection devices and interconnect a network running a redundancy protocol and another network running a redundancy protocol. The interconnection devices controls the redundancy protocol of a lower level network via virtual ports and by a virtual link, to redundancy-connect the lower level network to a higher level network. When a communication route of the lower level network is changed, MAC address learning results of the higher level network are cleared to perform switching of communication routes at high speed. | 04-30-2009 |
20100080235 | Forwarding Apparatus, Forwarding Method, and Computer Program Product - An extranet direct route allowing extranet forwarding to a directly linked device is written in a layer 2-layer 3-integrated forwarding table. The procedure of introducing a layer 3 address-to-layer 2 address correspondence relation table entry into the layer 2-layer 3-integrated forwarding table searches the layer 2-layer 3-integrated forwarding table with a layer 3 address of the correspondence relation table entry and a layer 3 interface as search keys to retrieve any forwarding entry relating to an extranet direct route as a forwarding destination. The procedure subsequently extracts a VRF of each retrieved forwarding entry and introduces the correspondence relation table entry for the extracted VRF into the layer 2-layer 3-integrated forwarding table. | 04-01-2010 |
20110013551 | NETWORK RELAY APPARATUS - The network relay apparatus is provided. The network relay apparatus includes: a relay apparatus selector configured to, in response to direct or indirect reception of a join request for a preset multicast group from an external device connecting with the network, refer to information for identifying respective network relay apparatuses on a segment which the own network relay apparatus belongs to, and, at least one of information for identifying the preset multicast group and information for identifying a source, wherein the information for identifying the preset multicast group and the information for identifying a source are included in the received join request, and unequivocally select one network relay apparatus among at least part of the network relay apparatuses on the segment as a designated network relay apparatus according to a predetermined rule, wherein the designated network relay apparatus is assigned to relay a multicast packet to the external device; and a setter configured, when the own network relay apparatus is selected as the designated network relay apparatus by the relay apparatus selector, to set a multicast route for relaying the multicast packet to the external device, and when the own network relay apparatus is not selected as the designated relay apparatus by the relay apparatus selector, not to set the multicast route for relaying the multicast packet to the external device. | 01-20-2011 |
20110032939 | NETWORK SYSTEM, PACKET FORWARDING APPARATUS, AND METHOD OF FORWARDING PACKETS - A network system includes: a first network; an authentication server; a second network; a network; and a packet forwarding apparatus, wherein the packet forwarding apparatus includes: a forwarding route table storage storing a first forwarding route table containing packet routing information to the second network, and a second forwarding route table containing packet routing information to the second network and the third network; and a forwarding route table selector that, prior to determination of successful authentication for the terminal apparatus, selects the first forwarding route table as a search forwarding route table, and that upon receipt of determination of successful authentication for the terminal apparatus, selects the second forwarding route table as the search forwarding route table. | 02-10-2011 |
20110055622 | NETWORK SYSTEM AND NETWORK RELAY APPARATUS - The network system is provided. The network system includes: a first processing apparatus configured to provide a specific service; a second processing apparatus configured to provide the specific service, the first processing apparatus and the second processing apparatus having one identical address; a client apparatus configured to utilize the specific service; and a network relay apparatus connected directly or indirectly via interfaces to the first processing apparatus, the second processing apparatus, and the client apparatus and configured to relay packet transmission between the client apparatus and the first processing apparatus or the second processing apparatus, wherein the network relay apparatus forwards a received packet, which is received via the interface connecting with the client apparatus to be sent to the address as a destination, to one processing apparatus in a state enabled to provide the specific service between the first processing apparatus and the second processing apparatus. | 03-03-2011 |
20110164508 | NETWORK RELAY APPARATUS, NETWORK SYSTEM, AND CONTROL METHOD OF NETWORK RELAY APPARATUS - Network relay apparatus connected directly or indirectly to a first processing apparatus, a second processing apparatus, and a client apparatus, the network relay apparatus being configured to relay packet communication between the respective apparatuses, wherein one identical address is set in both the first processing apparatus and the second processing apparatus, and the client apparatus uses the first processing apparatus and the second processing apparatus. The network relay apparatus includes: a first route information storage configured to store route information of a first virtual network to which the first processing apparatus belongs; a second route information storage configured to store route information of a second virtual network to which the second processing apparatus belongs; a route information advertiser configured to receive advertisement for route information on the first virtual network and store the received route information into the first route information storage, a state detector; and a packet forwarding processor. | 07-07-2011 |
20110292931 | NETWORK SYSTEM AND NETWORK APPARATUS - In a virtual network apparatus, even when a fault occurs on a private line connecting plural physical network apparatuses to communicate a control signal, the redundancy is maintained, and the lower forwarding capability is prevented. In this network system, a control signal for virtualization to be transmitted and received between plural physical network apparatuses is relayed via a unit spanning LA connecting each physical network apparatus and an adjacent network apparatus in the adjacent network apparatus. Thereby, even when a fault occurs in the private line, it is possible to continue to communicate the control signal between the physical network apparatuses and continuously operate the virtual network apparatus. | 12-01-2011 |
20120201254 | NETWORK DEVICE AND ITS CONTROL METHOD AND COMPUTER PROGRAM PRODUCT - A network device | 08-09-2012 |
20120327811 | VIRTUAL NETWORK CONNECTION METHOD, NETWORK SYSTEM, AND NETWORK DEVICE - A communication can be conducted between a hub network layer-3VPN-connected to a core network and a hub network layer-2VPN connected to the core network. A first NW that conducts a packet forwarding of a VPN, a second NW that is layer-3-connected to the first NW, and a third NW that is layer-2-connected to the first NW configure VPN. When a packet is transmitted from the second NW to a destination of the third NW, a packet forwarding processing by a layer is conducted, and information is stored in destination information of the packet and forwarded by using destination information and information on the network device PE belonging to the first NW which is connected to the third NW which is a relay point to the destination. | 12-27-2012 |
20130170359 | NETWORK DEVICE AND NETWORK SYSTEM - In a ring network including an old master node | 07-04-2013 |
20130304805 | NETWORK SYSTEM AND NETWORK RELAY APPARATUS - The network system is provided. The network system includes: a first processing apparatus configured to provide a specific service; a second processing apparatus configured to provide the specific service, the first processing apparatus and the second processing apparatus having one identical address; a client apparatus configured to utilize the specific service; and a network relay apparatus connected directly or indirectly via interfaces to the first processing apparatus, the second processing apparatus, and the client apparatus and configured to relay packet transmission between the client apparatus and the first processing apparatus or the second processing apparatus, wherein the network relay apparatus forwards a received packet, which is received via the interface connecting with the client apparatus to be sent to the address as a destination, to one processing apparatus in a state enabled to provide the specific service between the first processing apparatus and the second processing apparatus. | 11-14-2013 |