JPH0369227A - Node fault decision system - Google Patents

Abstract

PURPOSE:To speed up recovering work of a fault and to prevent erroneous judgement by notifying fault information through a communication line to other nodes and a monitoring device when each node detects the fault in its own node, and recording to a matrix for node fault decision by its recording means in the monitoring device. CONSTITUTION:When the fault occurs in a node 21b, for example, nodes 21a, 21c and 21d connected to the node 21b respectively detect the fault. When the information notification of this fault is received, the monitoring device 12 discriminates whether a fault code in the received information is a code with possibility to be generated by the node fault or not. In the case of the code with the possibility of generation, based on the address of the node as a detection source receiving the corresponding spot in the matrix for node fault discrimination, and the address of the node as a connection destination, recording under fault generation is executed. Accordingly, the place generating the node fault can be speedily and exactly decided regardless of the experience or judging ability of an operator.

Description

[Detailed Description of the Invention] [Summary] Regarding a node failure determination method when a failure occurs in a node in a mesh-like network, a transmission line alarm that may occur when a node connected by a transmission line becomes a failure is , supervision from each node? J! The purpose is to determine whether the failure is a node failure or a transmission line failure when the equipment is notified, without depending on the operator's judgment. In a node failure determination method for a network in which a monitoring device is connected to a mesh-like network via a transmission line accommodating a communication line for mutual communication, each node in the mesh-like network a transmission means for transmitting the fault information, a fault detection source node address, and a connection destination node address of a fault transmission path connected to the node to the monitoring device via the communication line upon detection, the monitoring device When receiving the fault information, the fault detection source node address, and the connection destination node address transmitted from the node, the fault determination unit determines whether the fault information is a fault that may occur due to a node fault. means, and when the fault determining means determines a fault that may occur due to a node fault, each of all nodes in the mesh-like network is connected based on the fault detection source node address and the connection destination node address. A recording means for recording the occurrence of a failure in a predetermined position of the seven node failure determination matrix representing the relationship between the destination and the detection source, and determining whether or not there is a node failure from the node failure determination matrix recorded by the recording means. and determining means for determining r11.

[Industrial application field]

The present invention relates to a node failure determination method, and more particularly to a node failure determination method when a node failure occurs in a mesh-like network.

With the recent demand for higher reliability of network systems, there is a demand for prompt recovery in the event of a fault, and prompt detection of the location where the fault occurs. For this reason, monitoring equipment centrally monitors the entire network, but it merely stores and visualizes the alarm information notified from each node, and if a node becomes a failure,
Since the other nodes are notified of the detection as a transmission path failure, it is necessary to examine the source of the failure from the failure information and determine the failure of the node.

(Prior Art) A conventional node in a network has a network monitoring device in which nodes accommodating terminals are connected in a mesh-like manner by a transmission line accommodating a terminal line and a communication line for mutual communication between the nodes. In the failure determination method, when a failure occurs in a node, the transmission line failure is detected in an adjacent node connected to the failed node by a transmission line, so the adjacent node is made to notify the direct viewing device of the detected transmission line failure. In the monitoring device, an operator refers to transmission path failure notifications from each node, examines the location where the failure has occurred, and determines whether a node failure has occurred.

[Problem to be solved by the invention]

However, in the conventional node failure determination method described above, node g! Since the operator of the monitoring device is responsible for determining the damage, the time required for the determination and the determination results are greatly influenced by the operator's experience and judgment ability. The transmission path is II'! The problem arises that it is mistakenly determined that the status is F, and that it takes a long time to recover.

The present invention has been made in view of the above-mentioned points, and the present invention has been made in view of the above-mentioned points. It is an object of the present invention to provide a node failure determination method that determines whether a node failure or a transmission path failure occurs without relying on operator judgment.

(Means for Solving 51 Problems) Fig. 1 shows a principle block diagram of the present invention. In the figure, 11 is a mesh-like network in which each node accommodating a terminal communicates with the adjacent node the terminal line. The network is connected to the monitoring device 12 in a mesh-like manner through a transmission path that accommodates the network and communication lines for mutual communication between the nodes.

Each node in the mesh network 11 has a transmitting means, and when a failure is detected, it transmits failure information, the failure detection source node address, and the connection destination node address connected to that node to the monitoring device 12. do.

The monitoring device 12 has a fault determination means 1 that determines whether the above fault information is a fault that may occur due to a node fault.
3, a recording means 14 for recording the occurrence of a failure in a predetermined relay of the node failure determination matrix, and a determination means <15> for determining whether or not there is a node failure from the recorded node failure determination matrix.

The node failure determination matrix described above is a matrix representing the relationship between the connection destination of the failure transmission path and the detection source for each of all the nodes in the mesh-like network 11, and is connected to the failure detection source node address by the recording means 14. The occurrence of a failure is recorded at a predetermined position according to the destination node address.

[Effect]
'When each node in the mesh network 11 detects a fault, it notifies other nodes and the monitoring device 12 of the fault information via the i-line.

The monitoring device 12 uses its recording f stage 14 to record in the node failure determination matrix if the notification content is a failure that may occur due to a node failure.

The determining means 15 refers to this node failure determination matrix for the connected node, and when it detects that a failure is recorded in all transmission paths connected to the node, it determines that a failure has occurred in the node. It is determined that

Therefore, in the present invention, the monitoring device 12 can determine whether there is a node failure or a transmission line failure without depending on the operator's judgment.

〔Example〕

FIG. 2 shows an example of a network configuration to which the present invention is applied. In the figure, the same components as in FIG. 1 are given the same reference numerals. In FIG. 2, 21a.

21b, 21c, 21d, and 21e are nodes connected to a plurality of terminals 22, 23, 24, 25, and 26, respectively, and transmit and receive information after multiplexing information from the terminals 22 to 26. Separate data and terminal 22~
26, and when a failure is detected on its own node, it generates failure information in the format shown in Figure 3, and uses the communication lines in all normal transmission paths connected to it. It also has a sending function to notify other nodes.

Here, in FIG. 3, ■ indicates a fault code representing the content of the fault, ■ indicates the fault detection source node address representing its own node that detects the occurrence of the fault and sends fault information, and ■ indicates this node indicates a connection destination node address representing a transmission path (or an adjacent node connected to it) in which a failure has occurred among the transmission paths to which is connected.

Further, in FIG. 2, nodes 21a and 21b are connected via a transmission path 27ab, and similarly, nodes 21a and 21d are connected via 27ad, /-F21b, 21e.
The interval is 27 bc, /-t'21 b.

21dffJLt27bd, /-F21c, 21dll
The nodes 21c and 2ie are connected via transmission lines 27cd, the nodes 21c and 2ie are connected by 27ce, and the nodes 216 and 21e are connected by 27dO.

Each of the transmission lines 27ab to 27de, which connect the nodes 21a to 21e in a mesh pattern, accommodates a terminal line and a communication line for mutual communication between the nodes. Solid lines within the transmission lines 27ab to 27de indicate control paths.Furthermore, the node 21a is connected to the monitoring device 12.

Although not shown in FIG. 2 for convenience, a line termination device is actually connected between the transmission path and the node.

The monitoring device 12 determines in advance the configuration of the mesh network 11 so that all of
"1"detection" indicating each address of e are arranged horizontally, and "node 1" indicating the adjacent node to which each node 21a to 21e is connected via a transmission line, "connection destination 1 is arranged vertically" A fault determination matrix is provided.In FIG. 4, a to e indicate the subscripts of the nodes 21a to 21e, and white circles indicate connections.

For example, the detection source and connection destinations a, C, and d each have white circles, which means that node 21b is node 21a.

21c and 21d, respectively.

Next, the operation when a failure occurs will be explained. Network failures include node failures and transmission line failures. First, we will explain the operation when a node failure occurs. Now node 2
1b, each of the nodes 21a, 21c, and 21d connected to node 21b detects the failure and transmits the failure information in the format shown in FIG. υItl in a normal transmission path
l bus to other nodes.

Here, since a failure has occurred in the node 21b, all transmission lines 27ab and 27ab connected to the node 21b,
27bc and 27bd are deemed to have failed, nodes 21a and 21d notify each other of the failure information via the transmission line 27ad, and nodes 21c and 21d notify each other of the failure via the transmission line 27cd. Notify information. Further, the node 21c notifies the node 21e of the occurrence of a failure in the transmission line 27bc via the transmission line 27CO, and the node 21d notifies the node 21e of the occurrence of a failure in the transmission line 27bd via the transmission line 27de.

When other nodes receive this fault information, they check to see if it has already been received, and if it has not been received, it will notify the other node in the same way as the fault detection source, and if it has already been received, it will discard it. . In addition, the node 21a transmits the fault information to the other node 21d, and also notifies the monitoring device 12 of the fault information including the fault information received from the other node.

When the monitoring device 12 receives this fault information notification, it performs fault determination according to the flowchart shown in FIG. That is, in FIG. 5, when a failure information notification is received (step 31), it is determined whether the failure code in the received information in the format shown in FIG. 3 is a code that may occur due to a node failure (step 32). ``-'' that can occur due to node failure include:
For example, there is a code indicating a frame mismatch, a code called uNR sent from the line terminating device due to a signal disconnection between the node and the line terminating device, and so on. On the other hand, codes that are considered to be a transmission failure rather than a node failure include, for example, a code indicating a zero cut, a code called DNR sent from a line termination device when a transmission path failure occurs, and so on.

In the case of a code that may be caused by a node failure, the monitoring device 12 detects the corresponding recess in the node failure determination matrix shown in FIG. 4 based on the received detection source node address and connection destination node address. , performs recording while the failure is occurring (step 33).

Therefore, by the process of step 32, the fault determining means 1
3 is realized, and the recording means 14 is realized by the process of step 33. As a result of the processing in step 33 described above, the 7-tricks for node failure determination become as shown in FIG. In the figure, black circles indicate rice bowls recorded as having Wa damage.

Next, the monitoring device 12 searches horizontally for all nodes at the connection destination in the node failure determination matrix,
(indicated by white circles in FIG. 6) are all in failure state (indicated by black circles in FIG. 6) (step 34 in FIG. 5). In other words, the process in step 34 15, and here, as shown in FIG. 6, all the columns for connection destination b (that is, node 21b) indicate that the project failure is occurring, so the monitoring unit 12 records node failure in the above matrix. Step 35 in Figure 5)
. As a result, the matrix for node failure determination is the 6th F.
j! Recording is performed as schematically shown by placing a black circle at the 9th position where the column indicated by "Node failure" and the column of connection destination intersect in J.

The node failure determination matrix shown in FIG.
and 21d have notified the occurrence of a failure in the transmission line connected to the node 21b. Therefore, in this case, the three transmission lines 27ab, 27bc, and 27bd are connected to the node 21b.
Since the probability that a failure has occurred at ACr1m is almost zero, it is determined that a failure has occurred in the node 21b.

As a result, the monitoring device 12 proceeds from step 35 to step 36 in FIG. 5, and performs node failure handling processing. Therefore, the failure of the node 21b can be determined reliably and quickly without erroneously determining that it is a failure of the transmission path.
1b can be restored early.

On the other hand, if it is determined in step 32 shown in FIG. 5 that the fault code is not a code that may be caused by a node failure, or if it is determined in step 34 that all the connection transmission paths of the connected node are not in failure. If it is determined that there is a fault in the transmission line, fault handling processing is performed (step 37).This fault handling processing includes methods such as switching the transmission line from the active to the standby, or detouring the line.

Therefore, even if a failure occurs in the transmission line 27ab, for example, and the failure may be caused by a node failure, as a result of the recording in step 33, the node failure determination matrix is Since the result is as schematically shown in the figure, it is possible to accurately determine that there is a failure in the transmission line 27ab by the determination in step 34.

Note that when a failure occurs in the node 21a, the above failure information notification is not made, but the occurrence of the failure can be detected by the regular monitoring operation of the node 21a by the monitoring device 12.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to determine whether there is a node failure in the network or a failure in the transmission path without depending on the judgment of the operator, so that node failure can be quickly and accurately detected regardless of the operator's experience or judgment ability. It is possible to determine the location where node failure has occurred, and this enables early detection of node failure. It has the advantage of being able to perform old processing.

[Brief explanation of drawings]

Fig. 1 is an original configuration diagram of the present invention, Fig. 2 is a diagram showing an example of a network configuration to which the present invention is applied, Fig. 3 is a diagram showing an example of failure information for knots, and Fig. 4 is a node fault diagram. FIG. 5 is a flowchart for explaining the operation of an embodiment of the main part of the system of the present invention; FIGS. 6 and 7 each show an example of the matrix for determining node failure when a failure occurs. FIG. 14 is a recording means, 15 is a determination means, 21a to 21e are nodes, 22 to 26 are terminals, 27ab, 27bc, 27ad, 27bd, 2
7cd. 27de and 27ce indicate transmission paths.

Claims (1)

[Claims] A network in which each node accommodating a terminal is connected to an adjacent node in a mesh-like manner via a transmission line accommodating a terminal line and a communication line for mutual communication between the nodes. In the node failure determination method for a network in which a monitoring device (12) is connected to a network (11), each node in the mesh network (11) transmits the failure information, the failure detection source node address, and the node address when a failure is detected. The monitoring device (12) includes a transmission means for transmitting a connection destination node address of a connected failed transmission path to the monitoring device (12) via the communication line, and the monitoring device (12) a fault determining means (13) for determining whether or not the fault information is a fault that may occur due to a node fault when receiving the fault information, the fault detection source node address, and the connection destination node address; When the means (13) determines a failure that may occur due to a node failure,
Based on the fault detection source node address and the connection destination node address, a fault is detected at a predetermined position in the node fault determination matrix representing the relationship between the connection destination and the detection source for each of all nodes in the mesh network (11). It is characterized by comprising: a recording means (14) for recording the occurrence; and a determining means (15) for determining whether or not there is a node failure from the node failure determination matrix recorded by the recording means (14). Node failure determination method.