Hitachi Metals, Ltd.

Apresia Systems, Ltd.

Makoto Yasuda

Shigeru Tsubota

A plurality of management cards including an active card and a standby card are provided. The active card determines open or block of a ring port in accordance with an event based on a ring protocol, issues an open instruction or a block instruction to a line card, and notifies a block factor in addition to the block instruction when issuing the block instruction. The line card controls open or block of the ring port in accordance with the open instruction or the block instruction and retains open/block information of the ring port and a block factor of the block state in a port management table. When the standby card is changed to the active card in accordance with a predetermined change instruction, it acquires the information retained in the port management table from the line card.

Relay device and relay system

An encapsulation address of a first switching device is set so as to be different only in a mask bit in comparison with that of a second switching device. A learning information control unit of a third switching device does not learn the correspondence relation between a source customer address and a source encapsulation address in a first case and a second case. The first case corresponds to a case in which an encapsulated frame is received at an upper-link port and an encapsulation address corresponding to the source customer address is acquired from an address table. The second case corresponds to a case in which a difference between the source encapsulation address and the encapsulation address acquired from the address table lies only in the mask bit.

Relay system and switching device

When relaying a frame received at a MCLAG port to a bridge port, a MCLAG identifier adding unit adds a MCLAG identifier to the frame. When an encapsulated frame to which a MCLAG identifier has been added is received at the bridge port and the encapsulation of the frame, is performed by a peer device, a learning information control unit does not learn an encapsulation address contained in the encapsulated frame. More specifically, the learning information control unit learns a source customer address contained in the frame in association with the MCLAG identifier added to the frame to the address table, but does not learn a source encapsulation address.

A MCLAG table retains a first port in association with a first identifier. A port control unit controls a first port group to a transmission/reception permitted state when the first port group is set to active, and controls the first port group to a transmission/reception prohibited state when the first port group is set to standby. A relay processing unit relays a frame containing the first identifier as a destination port to the first port group when the first port group is controlled to the transmission/reception permitted state and relays the same to a bridge port when the first port group is controlled to the transmission/reception prohibited state. When the first port group is controlled to the transmission/reception prohibited state, a transmission stop instructing unit instructs a peer device to stop frame transmission to the first port group.

When a frame is received at a first port, a MCLAG learning frame transmitting unit generates a MCLAG learning frame containing a source MAC address of the frame and transmits it from a bridge port to a peer device. When the MCLAG learning frame is received and the MCLAG learning frame contains a source MAC address and does not contain a MCLAG identifier, a MCLAG learning frame receiving unit learns a second correspondence relation between a port identifier of the bridge port and the source MAC address to an address table.

A first redundancy device and a second redundancy device connected to the first redundancy device are provided. A third switching device has a first link with a first port group of the first switching device and has no link with the second switching device. A fourth switching device has a second link with a first port group of the second switching device and has no link with the first switching device. Here, a communication between the first redundancy device and the second redundancy device is performed through the first link when the first link has no fault, and the communication is performed through the second link when the first link has a fault and the second link has no fault.

Each of MCLAG devices has a MCLAG table, a port control unit, and a relay processing unit. The MCLAG table retains one or a plurality of first ports in association with a first identifier. The port control unit controls a first port group to transmission/reception permitted state when the first port group is set to active, and controls the first port group to a transmission prohibited state when the first port group is set to standby. The relay processing unit relays a frame containing the first identifier as a destination port to the first port group when the first port group is controlled to the transmission/reception permitted state, and relays the same to a bridge port when the first port group is controlled to the transmission prohibited state.

A first fault monitoring unit monitors presence/absence of fault on a communication path between bridge ports, and a second fault monitoring unit monitors presence/absence of fault on a communication path via a ring network between upper link ports. A third fault monitoring unit monitors presence/absence of fault at a MCLAG port. When a monitoring result by the third fault monitoring unit changes from absence of fault to presence of fault, a MCLAG control unit transmits a fault notification frame. At this time, when a monitoring result by the first fault monitoring unit is absence of fault, the MCLAG control unit transmits the fault notification frame from the bridge port, and when the monitoring result by the first fault monitoring unit is presence of fault and a monitoring result by the second fault monitoring unit is absence of fault, it transmits the fault notification frame from the upper link port.

A network relay device capable of easily recognizing a state of hash value collision is provided. Each of a plurality of entries contained in an address table includes: a first area in which first information is registered, the first information indicating a relation between a plurality of ports and MAC addresses existing beyond the plurality of ports; and a second area in which second information is registered. In learning a transmission-source MAC address of a frame received at a port, a frame processing unit calculates a hash value by using the transmission-source MAC address first. Next, if a MAC address different from the transmission-source MAC address has been registered in the first area of an entry corresponding to the hash value, the frame processing unit registers the second information in the second area.

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Tsuchiura, Japan

Makoto Yasuda