KR20020085051A - System for monitoring link status in duplication system and method thereof - Google Patents

Abstract

PURPOSE: A system and method for monitoring link status in a duplication system is provided to analyze standby link status as well as active link status and to monitor link status for the standby link. CONSTITUTION: A link selection and transmit-receive part(357) executes a control operation so that an active link and a standby link can be always connected to the first framer(353) and the second framer(355) respectively. The data inputted to the first framer(353) through the active link are connected to a back board(330) through a data path. The back board(330) connects the data to a front board(300). The standby link data inputted to the second framer(355) are monitored through a link alarm and status confirmation function in the second framer(355). The second framer(355) outputs the monitored standby link status to the data bus of the front board(300) through the back board(330) so that a CPU(311) can catch the standby link status inputted through the data bus.

Description

System and method for monitoring link status in redundant systems {SYSTEM FOR MONITORING LINK STATUS IN DUPLICATION SYSTEM AND METHOD THEREOF}

The present invention relates to a redundant system, and more particularly, to a redundant system state management system and method through active and standby link monitoring.

In general, when a system is expanded and a plurality of boards according to the system expansion are provided, the system is implemented in a redundant structure for normal operation of the system. That is, the system components have an active and standby structure, and when a failure and a failure occur while performing an operation on the active side, the system components switch to the standby side to perform the active side. The operations that were used are normally performed again.

In the transmission / reception board in which the above redundancy structure is implemented, that is, the transmission link board A (active state) and the transmission link board B (standby state), the transmission link currently active on the transmission board side. If Board A does not have a failure in the transmitting link board itself through a self test, it activates itself and transmits data to the receiver. Then, the reception board side determines which link among the transmission link board A and the transmission link board B is in an active state, and receives data of the determined active link.

By the way, since the transmission board side separates the active and standby states and transmits the data only to the link in the active state, no problem occurs in transmission. However, a large amount of loss occurs in the transmission data depending on the link state and communication state. In case of occurrence, there is a problem that the receiving side must continuously receive data from the active link even though the data received from the transmitting board side active link is abnormal. In addition, when the transmission board side is directly switched from the active link to the standby link, since any information according to this duplication transfer is transmitted without transmitting the information to the receiving board side, the receiving board side also receives the standby link from the active link. There was a problem with the transition.

Accordingly, an object of the present invention is to provide a system and method for monitoring a link state for a standby link by analyzing a standby link state as well as an active link state in a redundant system.

Another object of the present invention is to provide a system and method for monitoring a function failure for both an active link and a standby link in a redundant system.

The system of the present invention for achieving the above objects; A standby link state monitoring system of a redundant system, comprising: a front board, a rear board, and a back board having one end connected to the front board and the other end connected to the rear board to perform data connection. A link selection and transmission / reception unit for controlling an active link of the links to a first framer and a standby link of the received links to a second framer, and data received from the active link through the data path. A first framer controlling to be connected to the network, and performing a link alarm and state analysis on data received in the standby link to determine the link state, blocking the data path to the received data, and determining the link state To the front board via the data bus And a second framer for controlling to detect a standby link state.

The method of the present invention for achieving the above objects; A standby board state monitoring method of a redundant system, comprising: a front board, a rear board, and a back board having one end connected to the front board and the other end connected to the rear board to perform data connection. The data received from the active link among the input links are transmitted to the front board, the data received from the standby link among the input links are analyzed to determine the link state, and the data received from the standby link. Discarding the data, and transmitting the determined link state to the front board so as to detect a standby link state.

1 is a diagram illustrating a redundant structure of a transmission board and a reception board performing a function in an embodiment of the present invention.

2 is a cross connection of FIG. Drawing showing an example of pinout using a cable

3 is a diagram illustrating a board structure for receiving active link data and monitoring a standby link according to an embodiment of the present invention.

4 is a diagram illustrating a board structure for dual failure notification according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that in the following description, only parts necessary for understanding the operation according to the present invention will be described, and descriptions of other parts will be omitted so as not to distract from the gist of the present invention.

1 is a diagram illustrating a redundant structure of a transmission board and a reception board performing a function in an embodiment of the present invention.

As shown in FIG. 1, each of the transmission board 100 side and the reception board 150 side has a redundancy structure, and as shown in FIG. In addition, each board is implemented as a front board performing main functions and a rear board for the physical layer interface according to the characteristics of the board. Such a redundant structure has the advantage that only the rear board needs to be replaced when the speed of the physical layer is changed. Of course, a plurality of such redundant structures may exist in a single backboard. In addition, the transmission board 100 side and the reception board 150 side have a cross redundancy structure in which A Side / B Side are connected by cross, respectively, as shown.

2 is a cross connection of FIG. It is a figure which shows an example of pin arrangement using a cable.

As shown in FIG. The pin arrangement using a cable is set to respective signals, namely interface signals, defined in the embodiment of the present invention.

Definitions of interface signals illustrated in FIG. 2 are as follows.

(1) RXD +: 155M Receive Data + signal received from the other party

(2) RXD-: 155M received data-signal received from the other party

(3) TXD +: 155M transmit data + signal to send to other party

(4) TXD-: Transmission data-signal of 155M to be transmitted to other party

(5) OTHER_ACT: Active or standby information of the duplicated party received from the other party

(6) MY_ACT: duplicated active or standby information sent to the other party

(7) MY_STS: My Link Status information that the other party received from the other party has received and judged their 155M data.

(8) OTHER_STS: Link state information of the other party that the person who sends to the other party receives and judges the other party's 155M data

(9) Dual_Fault: Alarm information that occurs when a failure is detected in both active / standby boards of its own redundant board

3 is a diagram illustrating a board structure for receiving active link data and standby link monitoring according to an embodiment of the present invention.

First, as shown in FIG. 3, the physical layer framer 351 of the rear board 350 includes two framers, namely, framer A 353 and framer B 355 in one chip. The implementation is implemented due to increased efficiency, and of course it is also possible to implement it using a single framer. As shown in FIG. 3, the link selection and transmission / reception unit 357 always has a link A, a link active in a link B, a link B, and the framer B 355. ) Controls that a link that is always in standby is connected. Then, the data through the active link input to the framer A 351 is connected to the backboard 330 through a data path, and the backboard 330 FRONT the data input from the framer A 351. Connect to board (300). Meanwhile, the standby link data input to the framer B 353 is monitored by using a link alarm and a status checking function in the framer B 353, and the data path is terminated. To do that. Therefore, the framer B 353 outputs the state of the monitored standby link to the data bus of the front board 300 through the back board 330. Then, the standby link state input through the data bus can be grasped by the control unit (CPU) 311. The active link input to the framer A 351 connects the data path toward the front board 300 so that the active link and the data path of the other party are always configured.

In addition, the other party did not detect any abnormality in its active link and selected the corresponding link as the active link, and transmitted data. However, the receiving side may have a problem with the received data through the active link, that is, in the active link. There may be a problem. When detecting the abnormality of the active link received by the framer A 351, as described with reference to FIG. 2, the active link is transmitted to the other party using the 'OTHER_STS' signal. Receiving the OTHER_STS 'signal enables active / standby switching of the link.

4 is a diagram illustrating a board structure for dual failure notification according to an embodiment of the present invention.

As shown in FIG. 4, when viewed from the front board A 411 position, the front board A 411 itself detects a function failure (My_FF) detected by the electrically programmable logic device (EPLD) 413. ) And a neighbor board, that is, a function fail (Next_FF) of the front board B 415, are added to transmit both the active link and the standby link of another module (MODULE). Although not shown in FIG. 4, the front board B 415 also operates in the same manner as the front board A 411. Then, when both the active and standby boards have a function failure due to a cause other than the front board A (411) link, the other party can be notified to the fact that a dual function failure has occurred, thereby providing basic information for stable operation. Utilized as.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible 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 defined not only by the scope of the following claims, but also by the equivalents of the claims.

The present invention as described above has the advantage that it is possible to monitor the link state for the standby link by analyzing the standby link state as well as the active link state in the redundant system. It also has the advantage of enabling monitoring of functional failures for both active and standby links in redundant systems.

Claims (8)

A standby link state monitoring system of a redundant system, comprising: a front board, a rear board, and a back board having one end connected to the front board and the other end connected to the rear board to perform data connection; A link selection and transmission / reception unit for controlling an active link among the links received from the other party to the first framer and a standby link among the received links to the second framer; A first framer for controlling data received at the active link to be connected to the frontboard through a data path; Link alarm and status analysis is performed on the data received in the standby link to determine the link state, the data path for the received data is blocked, and the determined link state is transmitted to the front board through the data bus. And a second framer that transmits and controls to sense a standby link condition. The method of claim 1, And the first framer transmits the abnormal state to the counterpart when the data received in the active link is in an abnormal state. In the double failure status monitoring system of a redundant system, A front board which detects a function failure of its own and adds the function failure transmitted from a neighboring front board and the detected function failure and outputs it; A rear board that receives a value obtained by adding a function failure of the front board itself and a function failure of a neighboring front board and determines a double failure state, and transmits a signal indicating the double failure state to a counterpart module. Dual failure status monitoring system of a redundant system, characterized in that consisting of. 1. A standby link state monitoring method of a redundant system, comprising: a front board, a rear board, and a back board having one end connected to the front board and the other end connected to the rear board to perform data connection. Transmitting data received from the active link among the links input to the rear board to the front board; Analyze the data received from the standby link among the input links to determine the link status, discard the data received from the standby link, and transmit the determined link status to the front board to detect the standby link status. Characterized by consisting of a process. The method of claim 4, wherein The determining of the standby link state may be performed by performing a link alarm and state analysis on the data received in the standby link. The method of claim 4, wherein And transmitting the abnormal state to the counterpart when the data received on the active link is in an abnormal state. In the double failure status monitoring method of a redundant system, To detect failure of their function, Detecting a function failure transmitted from a neighboring front board at the same time as detecting the function failure of the user; And transmitting a double failure state to the counterpart by adding the sensed failure of itself and the failure of the neighboring front board. The method of claim 7, wherein Wherein the dual failure state indicates that both the active link and the standby link are in a failed state.