KR20050095328A - Ethernet switching apparatus - Google Patents

Abstract

The present invention relates to an Ethernet switch device. The apparatus of the present invention provides a plurality of Ethernet switches, a subscriber interface for interfacing the Ethernet switch and the subscriber, an Ethernet matching unit for matching the Ethernet switch and the subscriber interface, and switching control of the plurality of Ethernet switches by the same number of ports. A plurality of crossbars to be managed so as to, and a control unit for controlling the data packet to be transmitted to the port corresponding to the subscriber's path by informing the switching control information along with the data packet to be transmitted to the crossbar. Therefore, the Ethernet switch device of the present invention can expand the port.

Description

Ethernet switching apparatus

The present invention relates to an Ethernet switch device, and to an Ethernet switch device for switching a plurality of ports for performing Ethernet with a plurality of subscribers through a VDSL subscriber interface.

In general, the OSI 7 layer is described when describing the LAN model. The OSI 7 layer includes a physical layer (PHY), a data link layer, a network layer, a transport layer, a session layer, and a presentation layer. It is divided into application layers.

Only the physical layer, which is the first layer associated with the Ethernet switch device, and the data link layer, which is the second layer, among the OSI 7 layers will be described.

The first layer, the physical layer, is involved in the transfer of data from one computer to another via physical media. The physical layer contains the definition of how the cable is connected to the network adapter card and what transmission technique is used to transfer data over the cable.

The second layer, the datalink layer, is involved in converting electrical signals from network adapter cards into network frames, and transfers frames from one computer to another. In addition, the datalink layer is divided into two sub-layers. The upper layer of the two sublayers is Logical Link Control (LLC), which manages data link communication and defines a SAP (Service Access Point). In addition, the lower layer of the two sublayers is MAC (Media Access Control) and performs direct communication with the network adapter card of the physical layer, which is the first layer.

  Recently, Ethernet switch devices have been attracting attention among devices for efficiently operating a LAN. Ethernet switch devices can be referred to as multi-port bridges. The Ethernet switch device includes a plurality of switches, for example, a schematic configuration of an 8-port switch will be described with reference to FIG. 1.

Referring to FIG. 1, an 8-port switch is referred to as an Ethernet switch for convenience of description below. The Ethernet switch 1 has a plurality of ports, that is, eight ports of ① to ⑧. One terminal, that is, 3-1 to 3-8, is connected to each Ethernet connected to each of the plurality of ports. It further includes a memory 5 for storing packets and information related to port control via the Ethernet switch 1 as peripheral logic, and a CPU 7 for controlling the Ethernet switch 1. Each Ethernet connected to each port of the Ethernet switch 1 is assigned to have a transmission rate of several tens to hundreds of Mbps (mega bit per second), thereby enabling high-speed data transmission. Using this Ethernet switch, multiple Ethernet segment packets can be efficiently sent to other segments, reducing network traffic. And, although not shown, the Ethernet switch 1 is connected to the VDSL subscriber interface that enables Ethernet through the VDSL between each port (① ~ ⑧) and the subscriber PC (3-1 to 3-8). . The Ethernet switch 1 and the VDSL subscriber interface are implemented to be interfaced through a reduced media independent interface (RMII) bus. Therefore, a separate buffer must be used and control logic is required. A switching chip having such a control logic controls a plurality of ports with one. Therefore, it was impossible to expand the number of ports.

Detailed operation using the buffer of the Ethernet switch 1 will be described with reference to the detailed block diagram of FIG.

Referring to FIG. 2, each of the buffers 2-1,... -N corresponds to a plurality of ports ① to ⑧ provided in the Ethernet switch 1, respectively. Each of the buffers 2-1, ... 2-N temporarily stores packet data input / output through the corresponding ports ①-⑧. Each of the port controllers 4-1, ... 4-N is connected to each of the buffers 2-1, ... 2-N, and the receiving and transmitting operations of each of the ports ①-⑧ are performed. Preside over In addition, it performs a series of procedures for each operation, delivers the necessary instructions to the lower blocks, and sends and receives the lower blocks and the necessary data. The port service scheduler 6 determines the priority of each of the ports ① to ⑧ to be serviced by the port controllers 4-1 to 4-N. If there is data to be received or transmitted, the port service scheduler 6 controls the corresponding port controller among the port controllers 4-1, ... 4-N according to the order so that packet data is transmitted or received. At the time of transmission, the packet data stored in the memory separately provided by the port service scheduler 6 is read and controlled to be output to the corresponding port. At the time of reception, the received data is stored in the memory by the port service scheduler 6.

In this way, the Ethernet switch 1 temporarily stores the packets from each port (① ~ ⑧) in the buffer and performs the function of searching for the desired port, and then stores the packets in the memory of the Ethernet switch. At this time, if the packet switch is overloaded, the processing time for the packet applied to the input buffer is delayed. As a result, the buffer is overflowed by packets that are subsequently applied, so packets that cannot be stored in the buffer are eventually dropped. This means that data loss occurs on the Ethernet switch.

Accordingly, an object of the present invention is to provide an Ethernet switch device that can implement the Ethernet without a separate control logic or buffer because a separate matching device between the Ethernet switch and the subscriber interface to solve the above problems.

In addition, the present invention provides an Ethernet switch device having a plurality of Ethernet switches and controlling only ports assigned to each switch, thereby enabling expansion of the ports.

Ethernet switch device according to the present invention for achieving the above object is a plurality of Ethernet switch, the subscriber interface for interfacing the Ethernet switch and subscriber, the Ethernet matching unit for matching the Ethernet switch and subscriber interface, a plurality of Ethernet A plurality of crossbars to manage the switch to control switching by the same number of ports, and a control unit for controlling the data packet to be transmitted to the port corresponding to the subscriber's path by informing the switching control information along with the data packet to be transmitted to the crossbar .

Hereinafter, with reference to the accompanying Figures 3 to 5 will be described in detail a preferred embodiment of the present invention.

3 is a block diagram illustrating an Ethernet switch according to an embodiment of the present invention.

Referring to FIG. 3, the Ethernet switch device includes an 8-port Ethernet switch 31 and an Ethernet matching unit 311 connected to be controlled by the Ethernet switch 31. The Ethernet matching unit 311 is matched with the VDSL subscriber interface 312 is connected. The VDSL subscriber interface 312 is connected with eight subscriber PCs 313-1, ... 313-8 connected by telephone lines.

Here, the Ethernet switch 31 performs switching of a corresponding port for transmitting and receiving data using eight ports, and the Ethernet matching unit 311 connected to the Ethernet switch 31 means eight ports.

Ethernet switch 31 receives data transmitted from subscriber PC (313-1, ... 313-8) through a specific port of the Ethernet matching unit 311, the subscriber PC (313-) 1, ... 313-8) to switch ports in the same transmission path. That is, the Ethernet switch 31 receives the data received from the subscriber PC 313-1, opens the switched path, and then transfers the data through the previously switched path when transmitting data to the subscriber PC 313-1. Send.

The Ethernet matching unit 311 is a port installed in the Ethernet switch device and is a female matching device. The VDSL subscriber interface 312 is matched to the Ethernet matching unit 311. The VDSL subscriber interface 312 is a male matching device for matching with the Ethernet matching unit 311. The VDSL subscriber interface 312 is connected with subscriber PCs 313-1, ... 313-8 for using Ethernet.

As such, when the VDSL subscriber interface 312 is matched, the Ethernet matching unit 311 enables Ethernet with the subscriber PCs 313-1, ... 313-8 under the control of the Ethernet switch 31.

4 is a block diagram illustrating the Ethernet matching unit 311 in more detail.

In fact, the Ethernet matching unit 311 is an RJ45 connector connected to the PHY.

4, a PHY 311a and an RJ45 connector 311b in the Ethernet switch 31 are provided, and a PHY 311A and an RJ45 connector 311B in the VDSL subscriber interface 312 are provided. The RJ45 connector 311b refers to a port provided in the Ethernet switch device, and the RJ45 connector 311B refers to a jack provided to the VDSL subscriber interface 312. That is, in order to transmit and receive data between the PHYs 311a and 311A, a pair of RJ45 connectors 311b and 311B may be matched. Since one Ethernet switch 31 has eight Ethernet matching units 311 to be switched, when an RJ45 connector is matched, data is transmitted and received through the corresponding connector. That is, the Ethernet matching unit 311 is for interfacing between the Ethernet switch device and the VDSL subscriber interface 312, the VDSL subscriber interface 312 is for the interface between the Ethernet switch device and the subscriber PC.

An Ethernet switch device including a plurality of pairs of the above-described Ethernet switch 31 and the Ethernet matching unit 311 corresponding thereto will be described with reference to FIG. 5.

5 is a block diagram illustrating an Ethernet switch apparatus including an Ethernet switch according to an embodiment of the present invention.

The Ethernet switch device of FIG. 5 has the same structure as the Ethernet switch 31 and the Ethernet matching unit 311 described above, the Ethernet switch 32 and the Ethernet matching unit 321, and the Ethernet switch 33 and the Ethernet matching unit ( 331). In addition, since each Ethernet switch 31, 32, 33 is an 8-port switch, each Ethernet matching unit 311, 321, 331 is composed of eight ports, and there are subscriber PCs connected to each port with a total of 24 ports.

Of course, there is a VDSL subscriber interface for interfacing with the Ethernet switch device in front of the subscriber PC as described in Figure 3, but the description thereof will be omitted.

And the first cross bar 30 for managing three Ethernet switches (31, 32, 33) is connected. The first crossbar 30 is for managing three Ethernet switches 31, 32, and 33. The first cross bar 30 determines which of the 24 ports is a corresponding path, and selects and switches the Ethernet switches 31, 32, and 33. do.

In addition, the second cross bar 40 is for managing the Ethernet switch 41 for the uplink for transmitting and receiving the Ethernet packet. The Ethernet switch 41 selects and controls the Ethernet packet transmitting and receiving unit 411 for transmitting and receiving the Ethernet packet. The fourth cross bar 60 is also connected to the Ethernet packet transmitting and receiving unit 61 for transmitting and receiving the Ethernet packet.

In addition, the third cross bar 50 manages three Ethernet switches 51, 52, and 53, respectively. Each of the Ethernet switches 51, 52, and 53 is connected to the Ethernet matching unit 511, 521, and 531 corresponding thereto. Ethernet switch 51 is connected to the Ethernet matching unit 511 for connecting to the subscriber PC, another Ethernet switch 52 is the Ethernet matching unit 521, the other Ethernet switch 53 is Ethernet matching It is connected with the part 531, respectively. The operations of the Ethernet switches 51, 52, 53 and the Ethernet matching units 511, 521, 531 corresponding thereto are the same as described above, and thus will be omitted. As such, the Ethernet switch device has a separate crossbar for managing three 8-port Ethernet switches.

  The crossbars described above are controlled by the CPU 80, and the first through fourth crossbars 30, 40, 50, and 60 are connected to the CPU 80 through the CPU interface 70.

When a subscriber connects to use Ethernet, for example, assume that a subscriber PC corresponding to a port belonging to the Ethernet matching unit 311 is connected. Then it is switched by the Ethernet switch 31 through the Ethernet matching unit 311, the Ethernet switch 31 transmits this connection information (IP address or MAC address) to the first crossbar (30). In addition, the first crossbar 30 transmits such connection information to the CPU 80 through the CPU interface 70. The CPU 80 then registers the IP address or MAC address of the subscriber PC currently connected. When the connection is completed and the path is generated in this way, the CPU 80 transmits the data packet requested by the subscriber PC later through the same path.

Looking at this in detail, the CPU 80 recognizes the IP address or MAC address of the connected subscriber PC and registers it as a new address. The CUP 80 first determines a crossbar to which the new address belongs in order to specify a path by switching a port to transmit a data packet. For example, if the corresponding path is one of the Ethernet switches managed by the first crossbar 30, the CPU 80 transmits a corresponding data packet and switching control information indicating the same to the first crossbar 30. The first crossbar 30 receives the data packet and the switching control information and determines the Ethernet switch to which a port to transmit among the three Ethernet switches 31, 32, and 33 belongs. For example, if it is determined that the first Ethernet switch 31 has a port to transmit, the first crossbar 30 transmits the data packet and the switching control information to the Ethernet switch 31.

On the other hand, the first crossbar 30 receives the switching control information received from the CPU 80, if the port to be transmitted does not belong to the Ethernet switch (31, 32, 33) managed by the other crossbar (40, 50) 60) transmits the data packet and the switching control information. Thus, each crossbar (40, 50, 60) is a port belonging to the Ethernet switch that it manages to transmit the data packet.

The Ethernet switch 31 receives the data packet and the switching control information from the first crossbar 30 to determine which one of the eight ports and transmits the data packet to the Ethernet matching unit 311 of the corresponding port. Then, the user PC receives the desired data through the VDSL subscriber interface (not shown) connected to the Ethernet matching unit 311.

Accordingly, the object of the present invention is to provide an effect that can implement the Ethernet without a separate control logic or buffer by having a separate matching device between the Ethernet switch and the subscriber interface to solve the above problems. .

In addition, it is provided with a plurality of Ethernet switches to control only the ports assigned to each switch provides an effect that the port can be expanded.

1 is a schematic block diagram of an eight-port switch in a general Ethernet switch device;

2 is a detailed block diagram illustrating a port of a general Ethernet switch device;

3 is a block diagram illustrating an Ethernet switch according to an embodiment of the present invention;

4 is a block diagram for explaining in detail the Ethernet matching unit of FIG.

5 is a block diagram illustrating an Ethernet switch apparatus including an Ethernet switch according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

31, 32, 33, 41, 51, 52, 53: Ethernet switch

311, 321, 331, 511, 521, 531: Ethernet matching part

312 VDSL subscriber interface

313-1, ... 313-N: Subscriber PC

311a, 311A: PHY

311b, 311B: RJ45 connector

30, 40, 50, 60: first to fourth cross bars

70: CPU interface

80: CPU

61, 411: Ethernet packet transmitter and receiver

Claims (7)

In the Ethernet switch device, A plurality of Ethernet switches; A subscriber interface for interfacing the Ethernet switch with a subscriber; An Ethernet matching unit for matching the Ethernet switch and the subscriber interface; A plurality of crossbars configured to control switching of the plurality of Ethernet switches by the same number of port units; And And a control unit which notifies the switching control information together with the data packet to be transmitted to the crossbar and controls the data packet to be transmitted to a port corresponding to the subscriber's path. The method of claim 1, The control unit is an Ethernet switch device characterized in that it further comprises an interface unit for the interface with the crossbar. The method of claim 1, The control unit is an Ethernet switch device, characterized in that for generating a switching control signal using the access information of the subscriber. The method of claim 3, wherein The access information is an Ethernet switch device, characterized in that any one of the IP address and MAC address. The method of claim 1, And the plurality of crossbars transmits a mutual switching control signal and a data packet when the plurality of crossbars are not ports in an Ethernet switch to receive a switching control signal from a controller. The method of claim 1, The Ethernet matching unit Ethernet switch device, characterized in that the port of the Ethernet switch and the jack of the subscriber interface to match. The method of claim 6, The port and the jack is an Ethernet switch device, characterized in that the RJ45 standard contactor.