One embodiment of the present invention provides a switch. The switch includes a tunnel management module, a packet processor, and a forwarding module. The tunnel management module operates the switch as a tunnel gateway capable of terminating an overlay tunnel. During operation, the packet processor, which is coupled to the tunnel management module, identifies in a data packet a virtual Internet Protocol (IP) address associated with a virtual tunnel gateway. This virtual tunnel gateway is associated with the switch and the data packet is associated with the overlay tunnel. The forwarding module determines an output port for an inner packet in the data packet based on a destination address of the inner packet.

Overlay tunnel in a fabric switch

One embodiment of the present invention provides a switch capable of processing software-defined data flows. The switch includes an identifier management module and a flow definition management module. During operation, the identifier management module allocates a logical identifier to a link aggregation port group which includes a plurality of ports associated with different links. The flow definition management module processes a flow definition corresponding to the logical identifier, applies the flow definition to ports in the link aggregation port group, and update lookup information for the link aggregation port group based on the flow definition.

Link aggregation in software-defined networks

A switch that facilitates remote port mirroring is described. The switch can include an encapsulation mechanism and a forwarding mechanism. The encapsulation mechanism can be configured to encapsulate a copy of a first packet in a second packet, thereby preserving header information (e.g., a VLAN identifier and/or a TRILL header) of the first packet. The forwarding mechanism can be configured to forward the first packet using header information of the first packet, and forward the second packet using header information of the second packet. The second packet can be received at a destination switch which extracts the first packet from the second packet, and sends the first packet on a port which is coupled to a network analyzer.

Remote port mirroring

One embodiment of the present invention provides a switch system. The switch includes one or more ports on the switch configured to transmit packets encapsulated based on a first protocol. The switch further includes a control mechanism. During operation, the control mechanism forms a logical switch based on a second protocol, receives an automatically assigned identifier for the logical switch without requiring manual configuration of the identifier, and joins a virtual cluster switch.

Virtual cluster switching

One embodiment of the present invention provides a system for facilitating flow definition management in a switch. During operation, the system identifies a generic flow definition which specifies a flow that is not specific to any input port of a switch. The system further stores in a flow lookup data structure one or more port-specific flow rules based on the generic flow definition, wherein each port-specific flow rule corresponds to a respective port capable of processing data flows.

System and method for flow management in software-defined networks

A communication system is provided with a down data frame reproducing and transmitting means in which an ND device (1) reproduces a down data frame addressed to a terminal device (8) and transmits each of the reproduced down data frame through different AP devices (3-1 to 3-3); an up data frame selective transmitting means that, in the case where a plurality of the same up data frames are received through different AP devices (3-1 to 3-3), transmits one of the up data frames to its address; an up data frame reproducing and transmitting means in which an ND device (2) reproduces an up data frame addressed to a terminal device (8) and transmits each of the reproduced up data frame through different STA devices (4-1, 4-2); and a down data frame selective transmitting means that, in the case where a plurality of the same down data frames are received through STA devices (4-1, 4-2), transmits one of the down data frames to its address.

Communication system, communication apparatus, wireless base station, and wireless terminal station

We developed a high speed wireless LAN prototype in the 5GHz band. Maximum transmission rate of the developed WLAN equipment was 324Mbit/sec using 6 multi-channels of 802.11a. We proposed a novel frame aggregation scheme to improve MAC efficiency. The proposed frame aggregation scheme had a feature of an adaptive aggregation size selection depending on thewireless channel conditions and application requirements. Throughput performance was obtained from simulation using a multiple station system with the proposed frame aggregation. A throughput of more than 150Mbit/sec was achieved with an evaluated system of 10 STAs. We also found that the measured throughput of more than 170Mbit/sec was achieved using the proposed frame aggregation.

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324Mbps WLAN Equipment with MAC Frame Aggregation for High MAC-SAP Throughput

We developed a high speed wireless LAN prototype in the 5 GHz band. Maximum transmission rate of the developed WLAN equipment was 324 Mbit/sec using 6 multi-channels of 802.11a. We proposed a novel frame aggregation scheme to improve MAC efficiency. The proposed frame aggregation scheme had a feature of an adaptive aggregation size selection depending on wireless channel conditions and application requirements. Throughput performance was simulated in the case of multiple stations with the proposed frame aggregation. The evaluated system throughput was achieved more than 150 Mbit/sec in the case of 10 STAs. It is found that throughput of the developed equipment was measured to be more than 170 Mbit/sec using the proposed frame aggregation

324Mbps WLAN equipment with MAC frame aggregation

We developed a high speed wireless LAN prototype in the 5GHz band that is backward compatible with legacy IEEE802.11a. The developed WLAN equipment has a data rate of 324Mbit/sec using 6 PHY transmission channels of 802.11a. We propose frame aggregation to improve MAC efficiency. The proposed frame aggregation features an adaptive aggregation size selection depending on wireless channel conditions and application requirements. The optimal frame aggregation size for the PHY data rate is evaluated by using computer simulation. MAC throughput as a function of aggregation size was simulated and measured. We find that high throughput of more than 170Mbit/sec was achieved using the proposed frame aggregation.

Implementation of 324Mbps WLAN equipment with MAC frame aggregation for high MAC-SAP throughput

A first packet input section distributes packets to a first or a second packet queue section according to an identifier assigned to a packet input from outside. A first queue controller selects the first and the second packet queue section according to the rotation priority control, acquires a packet according to a first or a second count value register of the selected first or second packet queue section and the accumulated packet state, and modifies the weight count value of the first or the second count value register of the selected first or the second packet queue section. A first packet generation section multiplexes the packets acquired by the first queue controller.

Yoshihiko Shirokura

Papers

Communication system, communication apparatus, wireless base station, and wireless terminal station

324Mbps WLAN Equipment with MAC Frame Aggregation for High MAC-SAP Throughput

324Mbps WLAN equipment with MAC frame aggregation

Implementation of 324Mbps WLAN equipment with MAC frame aggregation for high MAC-SAP throughput

Hierarchical scheduling device