Alaxala Networks Corporation

Hideo Kodaka

Kengo Miyajima

Shinji Nozaki

Hideki Hinosugi

Masashi Miyazaki

Takashi Miyazaki

Hiroto Ogaki

Ken Sunata

A first network switching device communicates to and from a second network switching device different in at least one of a device configuration and a device performance. The network switching device has at least one of plurality of network interface units and packet forwarding unit which is a power state control subject. A power state control unit of the first network switching device transmits, in order to change the power state of the second network switching device, a forwarding performance notification including the forwarding performance of a power state control subject after the change to the second network switching device.

Network switching device, network switching system, and method of changing power state of network switching device

A packet relay device determines a port to be placed on standby in a link aggregation, determines whether there is an active port among ports belonging to redundant network interfaces, and, if a network interface has no active port, places the network interface on standby. The packet relay device monitors whether a failure has occurred in an active network interface and, if a failure is detected, activates a standby network interface and places the failed network interface on standby.

Packet relay device

A fault that cannot be autonomously detected by all or a specific software module and all or a specific hardware device which realize the packet transmitting/receiving function is detected, and also a fault part is specified. A packet relay device realizes the packet transmitting and receiving functions through plural software modules and plural hardware devices. The packet relay device includes a memory space, reception statistics, and transmission statistics, and collects pass information of fault monitoring packets in all or the specific software module and all of the hardware devices whose operation is to be confirmed by the fault monitoring packets for detecting the faults within the device. A fault part specifying unitis provided for specifying the fault part according to the pass information of the fault monitoring packet when abnormality is detected.

Packet relay device, packet relay system, and fault detection method

A network devicefor relaying packets includes a network interface, a forwarding engine, a state change controller, a device state controllerand a device information table. The state change controllerand the device state controllercooperatively determine whether a packet receiver port that has received a sleep notification packet among a plurality of ports included in the network interfacehas setting of link aggregation. When link aggregation is set for the packet receiver port, the state change controllerand the device state controllerkeep the packet receiver port in a power ON state, while all other ports, which belong to an identical link aggregation group are to a power OFF state.

Network device and its control method and computer program product

In a packet relay apparatus equipped with a hierarchical bandwidth control function, a queuing unit of a bandwidth controller for controlling a bandwidth of a packet to be transmitted recognizes user information for identifying a user from VLAN ID of a received Tag-VLAN packet, acquires queue information representative of a queue position by referring to a priority mapping table by using a user priority order in the packet, and queues the packet to the queue identified by the user information and queue information. Bandwidth control can therefore be performed without searching a QoS information management table.

Growing community of inventors

Ebina, Japan

Hideo Kodaka