KR20100047388A - 10ge fail-over device by using digital circuit - Google Patents

Abstract

PURPOSE: By establishing FOD in the state that altogether dual each network element the device for fault restoration using the digital circuit for 10 giga Ethernet actually drives away the stable net. CONSTITUTION: By it physicals, forming bypass-line through communications path control devices(112, 113) the first bypass-line part offers the normal communications path to the off state of the power source. By offering bypass-line through the media converter the second bypass-line part offers the safe communications path to selection or the obstacle occurrence condition of user. Controller decides the communications path with the first bypass-line and the second bypass-line.

Description

Failover device for 10 Gigabit Ethernet using digital circuits {10GE Fail-over Device by Using digital circuit}

 See background technology.

The present invention is designed to overcome the duplication and failure of network communication equipment such as switch equipment or high-capacity security equipment using 10 Gigabit Ethernet as an external interface, and a method using XGMII and XAUI among 10GE's general signal specifications. The present invention relates to a fail-over device, that is, a fail-over device (FoD) designed based on digital circuits for physical signal transmission paths (signal communication paths) of in-line and bypass-line concepts using a physical communication path control device.

FoD is an abbreviation of Fail-over Device as mentioned above, and is a device used for network communication using various cables. In case of a failure, the network path is reconfigured to bypass the failing system physically and recovers the link failure that may occur due to network disconnection. FoD generally exists as an independent device outside the network communication equipment, and is a device configured by using a UTP cable or an optical cable.

In addition, in the Ethernet data communication, the FoD detects a failure of a specific equipment due to internal or external factors (fault status), detects it, and actively / passively determines another communication path (physical data transmission). Equipment that switches the main communication path to the network, ensuring minimal data loss with minimal time.

1 is a reference picture for better understanding of FoD. If packet data flows through the internal security device in the normal communication path as shown in the left figure, if a failure occurs, the path is changed to another communication path that does not cause any problem in network communication by bypassing the security device as shown in the right figure.

Most of the products on the market are based on 10/100 / 1000Mbps and generally use optical FoD devices, and 10 / 100Mbps devices sometimes implement FoD through cross switches. However, in case of FoD, which is mainly used below 1000Mbps, the optical / mechanical FoD is usually a single device or a standalone device, so there is a problem in detecting and quickly responding to the failure of main equipment. The time required for the fail-over method requires considerable time, ranging from a few seconds to several tens of seconds from the confirmation of a failure to recovery.

In addition, since the conventional product mainly needs to be connected between equipment by a fiber cable or a UTP cable as FoD is installed outside as shown in FIG. 2, reliability of the cable and stability of itself are also redundant. It is a composition that inevitably contains some unsafe elements to be identified.

In particular, when the backbone network or core network of large service providers (ISP or Telco) is coping with 1GE to 10GE, the failover method used in the existing 1GE is applied to the 10GE. Even in the same time unit, a huge packet (packet) loss of up to 10 times due to the difference in the transmission bandwidth (Bandwidth) can occur, and consumer complaints about this can be increased.

Therefore, by overcoming the problems of the prior art and sticking to the basics of failover, which is the existing basic FoD concept, it is possible to guarantee the minimum packet data loss through the earlier failover time and also to install it inside the main equipment. Through the development of the FoD equipment that is more stable and eliminates the anxiety caused by the cable due to the system configuration is required.

The present invention is designed to improve the prior art as described above, by using the concept of FoD used in the existing 1GE network can be solved the following problems by applying in the 10GE-class network.

A. Applicable in 10GE class network.

-Fast applicability according to the application of the standard specification of large capacity delivery media.

-Apply IEEE standard XAUI or XGMII interface.

-Application of 10GE Core Network or Backbone Network.

-Easy to expand and apply from lower Fast Ethernet class to 1GE class.

N. Reduced failover time

-Nano second fault recovery by applying digital circuit of XAUI or XGMII method

-A physical communication path control device operating at several giga clock speeds.

       Nano second failure recovery

Fast and quick fault determination and subsequent decision and execution time resulting from the internal mounting of the main unit as a modular type.

C. Minimize packet loss due to reduced failover time

-Packet loss according to the time taken in 1GE ~ 8 seconds

      If it was 144,000 to 1,152,000 packets per second, then applying that to 10GE

      1,440,000 to 11,520,000 packets are lost per second. But this development

      Is applied at several nanoseconds, so up to 1,440,000

      Can be reduced to

D. Integration of the control with the main device as a modular method mounted inside the main equipment

-Mounted inside the main unit, cost savings due to reduced additional power configuration.

-OTP or optical cable is not used, so it can be caused by various cable connections

       Remove anxiety

M. Various cables as the module (daughter board) is mounted inside the main unit

    Free from instability due to use.

-Reduced additional costs due to the additional use of cables.

-Reduction in management.

According to the present invention, a backbone network or a core network in which additional network equipment such as security equipment equipment is installed can be maximally secured from service interruption or fatal data loss by additional network equipment. The effect can be obtained. When the FoD of the present invention is installed in a state in which each network equipment is duplexed, it is possible to obtain the effect of enabling the most realistic stable network construction.

In addition, a minimum packet loss can be achieved by failing over as early as possible, and in various ways to prepare for critical error conditions at the user's request or the device itself. By forming the packet data bypass structure, it is possible to provide better performance than the conventional mechanical and optical FoD.

In addition, the network market, such as security equipment, which is developing at an enormously rapid pace, may have the effect of eliminating the anxiety of many operators who are reluctant to adopt due to the problem of the stability of the equipment itself, even though everyone is aware of the necessity of security. will be.

In addition, as a FoD of the type mounted inside the main device, there is an advantage that it is possible to not use unnecessary cables or the like outside, and also free from unstable enzymes such as cables.

As described above, although the present invention has been described with reference to the limited embodiments and the drawings, the present invention is not limited to the above-described embodiments, which can be modified by those skilled in the art to which the present invention pertains. And variations are possible. Accordingly, the invention idea should be understood only by the claims set forth below, and all equivalent or equivalent modifications thereof will fall within the scope of the invention idea.

In order to achieve the above object and to solve the problems of the prior art, the FoD apparatus according to the present invention is generally divided into two bypass paths and two in-line paths.

Bypass-line is a preliminary communication path used in case of failure of the main equipment, and means that a communication path is formed directly from A to D without passing through the internal function blocks B to C as shown in the right side of FIG. This is to secure only the minimum stable communication path to minimize the service failure state caused by the failure and to continue the stable service by providing only the physical communication path according to the failure of the main device. Thus, when data flows into Bypass, it can be regarded as a simple physical communication path because any other function affects or goes straight to external I / O without being controlled.

In-line is the main movement path of data input from the outside, and continues to be the main communication path until the failure of the main equipment occurs. For example, referring to the left figure of FIG. 1, the data input from A is transmitted to the outside through B and C, which are internal functional blocks, and again through I / O of D.

First, the configuration of a FoD device using a digital circuit is as follows.

In case of 10GE using XAUI and XGMII as the main interface, in order to change the communication path from in-line to bypass-line in several nanoseconds in case of failure in the equipment, first, commercial ICs operating in high frequency band should be based.

3 is a block diagram of FoD equipment that accommodates an external 10GE 2-port (total 4-port configuration) implemented through a conventional commercial IC using XAUI and XGMII. This configuration is a picture of FoD module when used for security equipment security equipment.

In general, when looking at products such as high-capacity security equipment on the market, it has a total of two uplink ports. Due to the nature of the security device, it is mainly located between the network physical layer 2 or 3 (L 2 / L 3) switch and the gateway (gateway) in the network, except for the security function, it merely provides a physical movement path. In particular, unlike the L 2 / L 3 switch, the security device is a necessary component on the network or a device having a lot of additional functional meanings rather than being recognized as a reliable device 100% reliable. Of course, it is a requirement of general security devices in the market that security devices must support both in-line mode and bypass-line mode in real time.

Referring to this point, when the FoD of FIG. 3 is mounted in the security device as a module type, the bypass-line mode setting for each section according to the internal obstacle factor at the same time as the in-line mode or bypass-line mode is changed in real time with minimal time Fast path-by-path mode enables critical fault conditions such as overload and power failure.

3 is an internal configuration diagram of FoD. In order to facilitate mounting of the board, it is interlocked with the main board in the form of connectors 111 and 119. At this time, the connector must guarantee the transmission speed of 10GE, so the impedance matching must be guaranteed. The front side of the figure is a type of input port that receives data from the outside. Data is received from the connector 111 on the front side and is input to the 10GE transmitter 114 through XFI, which is a 10GE fiber interface. At this time, by using the physical communication path control (112, 113) device in the middle of the signal connected to the XFI to establish a bypass-line to prevent the first power failure state.

In the normal operation of the board, the flow of data is a-> b-> Transmitter 114-> Connector (119)-> Main Function Block (121)-> Connector (119)-> Transmitter (115)- > c-> c-1. However, if there is a problem with the power supply of the main equipment and the whole equipment is abnormally operated, the physical communication path control device detects this and automatically changes the communication path from a-> b1-> c1 to prevent the packet from flowing. Change the path so that it flows normally as early as possible.

The principle that the physical communication path control device can operate in this way is to control the control pin of the physical communication path control device. When the value input to the control pin is signal level 1 (High), the communication path is changed to normal a-> b. Otherwise, if the value input to the control pin is function signal level 0 (Low, when the main device is turned off), the communication path goes from a to b1.

Another method of changing in-line mode and bypass-line mode uses a bypass-line 117 connected to the XGMII between the transceiver ICs 114 and 115 shown in FIG. 3. This method is effective when used mainly when the main equipment is in service, and because it is devices that operate based on the source clock of several tens of MHz, the XGMII (117), which is bypass-line mode in XAUI (116), which was in-line mode. It takes up to several tens of nanoseconds until it changes to), which can reduce the minimum packet loss in high-capacity communication such as 10GE.

In order to implement the above functions using the transceiver, the transceiver must have its own media converting function. In general terms, media converting is a communication method using an interface such as XGMII or XAUI. Generally, a method of sending data from XGMII to XFI or XAUI to XFI is used. Some of the functions often require a way to send data from XGMII to XAUI and vice versa, and media converting techniques are needed to meet this need.

 4 is a block diagram representing a data packet flow in a general state. As shown in FIG. 4, the data packet input through the XFP 212, which is a 10GE port of the security device, flows through the FoD to the security function block of the security device, and operates by the inherent function inside the security device security function block. The packet data will then flow again using another XFP port. At this time, controlling the flow of the packet also forms a normal in-line communication path when the transceiver 213 on the FoD is operated in the in-line mode as shown in FIG. 4.

At this time, the communication path can be changed from the in-line mode to the bypass-line mode by the failure state of the equipment or by the user's operation. Requires a register setting of the transceiver by the block. To do this, control the internal registers of the transceiver through the XMDC and XMDIO interface (118) to set the desired operation.

FIG. 5 is a block diagram illustrating the flow of packet data after changing a communication path from an in-line mode to a bypass-line mode by a failure state or an operation of a user. As shown in the figure, the packet data input through the XFI 312 is input to the transceiver 312 of the FoD via the XFI, and because the data is set to flow to the media converting function, that is, bypass-line, according to various conditions, Instead of sending data to XAUI, send it to XGMII to bypass packet data and send it to the outside (Tx).

FIG. 6 is a block diagram illustrating failure occurrence by the control unit of the FoD and control of each bypass line. The control unit driven by CPLD or uProcessor has three detection registers inside, such as power failure detection 411, user request 412, and other failure detection 413. The power failure detection 411 register causes the power failure detection 411 to be written to the corresponding register by an external circuit when the main power element driving the main board is defective or fails. The user request 412 register may be used when the user wants to bypass the communication path through 112 and 113 of FIG. 3 even when there is no abnormality of the main equipment or by using 117 of FIG. 3. When bypassing, this register is used to store the user's control. The other fault detection 114 registers consist of registers that can record whether the clock provided for the basic operation of the board is operating normally, or the normal operation status of key ICs in driving the main equipment. The system can be secured from catastrophic service interruption and packet loss due to some element of failure / failure.

Based on the values stored in the three registers, 414, 415, and 416 output the corresponding control signals, which are then transferred to the first bypass-line part and the second bypass-line part. The control signal originating from 412 is optionally ORed at 414 or 416 and 417 and 418 to be passed to communication path control 419 and the communication path control 419 sends this signal. The final control signal is output to the first bypass control unit 420 and the second bypass control unit 421 to finally determine the in-line mode and the bypass-line mode.

At this time, the first bypass control 420 signal is coupled to the direct power failure detection 422 is transmitted to the first bypass-line unit, the direct power failure detection 422, if a failure occurs in the main power of the equipment quickly The circuit is designed to apply / operate bypass-line mode, and it has the advantage of protecting the network from the fastest speed and the minimum packet loss in case of fatal failure condition such as power failure.

As shown in the above description, by securing the first bypass-line part, there is an advantage of overcoming a high-speed service failure state against power failure and maximizing the safety of the network from a critical power failure state. The packet loss rate is minimized compared to the FoD and the stable communication path is provided for the replacement of the main equipment that has a defect. And by additionally installing the second bypass-line part, to secure the real-time bypass line by the user's choice from minor or major failures (except critical failure status) of the main system, and to overcome the failure that consumes only a few nanoseconds time. There is an advantage to providing a bypass line.

In this way, the FoD equipment combining the first and second bypass-line units can greatly improve the reliability of overcoming the failure of the main equipment, and can easily replace the main equipment and change the use without interrupting service.

Although specific embodiments of the present invention have been described so far, various modifications may be made without departing from the scope of the present invention.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below, but also by the equivalents of the claims.

1 is a block diagram illustrating in-line and bypass-line in general form according to the prior art;

2 is a diagram showing a system configuration including FoD in a general form according to the prior art.

3 is a diagram illustrating FoD in the form of a module according to an embodiment of the present invention.

4 is a block diagram illustrating a packet data flow in an in-line mode according to an embodiment of the present invention.

5 is a block diagram illustrating packet data flow in bypass-line mode according to an embodiment of the present invention.

6 is a block diagram of a control unit according to an embodiment of the present invention.

Claims (5)

For Fail over Deivce (FoD) based on 10 Gigabit Ethernet, Forming a bypass line by the physical communication path control device to provide a normal communication path even when the power is off; providing a bypass line using a media converter, the second bypass line providing a safe communication path in case of user selection or failure; A control unit for determining a communication path to the first bypass line and the second bypass line according to respective situations; A communication unit providing wired-speed of 10GE communication and supporting a data communication line with an external device; A power supply unit configured to receive power from an external source and detect a main power state for the operation of the FoD module; Including, In 10GE communication, in the digital circuit configuration of the physical signal line that provides 10GE communication path, it provides in-line communication path and bypass-line communication path for stable 10GE communication, and changes fast transmission path in case of failure. in order to, By using the failure occurrence information collected by the control unit to output a failure recovery signal to the outside, Located in 10GE communication path to configure in-line and bypass-line using physical communication path control device and provide fail over function. The method of claim 1, In the configuration of the control unit, The power fault detection register monitors the power supply of the main board and, if a fault / fault occurs, writes it to a register that detects power failure by an external circuit, or directly in the case of the main power source, and applies it directly. To operate the 1st bypass line. The user request register records the user's command so that the user can bypass the communication path for other reasons even when there is nothing wrong with the main equipment. Other fault detection registers monitor or record the normal operation status of key ICs in driving the main equipment or the clock provided in driving the equipment. Ability to monitor the control and failure status of the FoD, including. The method of claim 2, According to the classification of the control signal according to the user power failure detection register, user request register and other failure detection register, A function to control the first bypass line by the user power failure detection register and a data path conditioning / operation function to control the second bypass line by the user request register and other failure detection registers. The method of claim 2, When controlling the user power fail detection register, In controlling the first bypass-line unit using a physical data communication path control device, the voltage level of the main power source is recognized, and when a failure occurs, it is quickly applied to the first bypass-line unit. The ability to bypass data communication paths in an early time. The method of claim 1, In the 2nd bypass line, it uses the Transceiver IC with media converting function and the XGMII function and the XAUI function to provide bypass and in-line.

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