JPH01128640A - Network supervising pass switching system - Google Patents

Abstract

PURPOSE:To speedily switch a supervising pass at a fault generating time in a relating node by setting the supervising pass based on a control table with the supervising system processing part of the respective nodes for the setting and switching of a network supervising pass. CONSTITUTION:When a transmission path 4ab is interrupted, since data can not be received in a node 2b, the fault generation is detected. Based on this detection and priority information (the order of (a), (c), (e) and (d) in this node (d)) from control information 5b to be held, a supervising system processing part 3b of the node 2b transmits the demand (request) of the supervising pass setting through a transmission path 4bc to the node of a (c) station. When his demand is received in a node (c), the supervising pass is provided with the node (b). According to this pass switching, in respective supervising system processing parts 5 of respective nodes (a)-(c), the control information are rewritten with being matched to the route of the supervising pass after the switching.

Description

[Detailed Description of the Invention] [Summary] Regarding a network monitoring path switching method in a network system in which a plurality of nodes are connected in a network, nodes and transmission paths are controlled by a monitoring path set on a data transmission path of the network system. The purpose of this system is to provide a network monitoring path switching method that quickly switches the monitoring path in the related nodes when a failure occurs in a system that monitors the status. network connected to
The system is equipped with a monitoring device that monitors each node using a network monitoring path set up via a transmission path, and each node has a monitoring path that displays the upper and lower relationships of each transmission path connecting its own node and other nodes. Equipped with a monitoring system processing unit equipped with a management table consisting of management information and priority management information that displays the order of other nodes to be connected to from the own node with priority, and the setting and switching of network monitoring paths is performed by monitoring each node. The configuration is such that a monitoring path is set between the system processing unit and the system processing unit based on the management table.

[Industrial Application Field] The present invention relates to a network monitoring path switching method in a network system in which a plurality of nodes are connected in a network.

In recent years, nodes (stations) that accommodate an arbitrary number of terminal devices that send and receive various types of data are connected in a network through time-division multiplex transmission paths, and data can be transmitted between terminal devices via arbitrary nodes. Network systems that do this have come into practical use. In such a system, it is necessary to check the normality of each node that multiplexes and demultiplexes time-division multiplexed data and the transmission path between nodes, and when an abnormality occurs, it is detected immediately and recovery processing is carried out as soon as possible. It is necessary to do so.

Therefore, monitoring equipment is installed to monitor each of these nodes and the transmission paths between the nodes, but it is desirable to efficiently install transmission paths for transmitting monitoring signals and to take immediate action in the event of a failure. It is rare.

[Prior Art] FIG. 3 shows the configuration of Conventional Example 1, and FIG. 4 shows the configuration of Conventional Example 2.

In FIG. 3, 30 is a monitoring device, 31 is a node, and 32
indicates a transmission path, 33 indicates a terminal device, alpha vents a, b, c, d, and e attached to 31 indicate individual nodes, and ab, ac, and・
etc. indicate a transmission path connecting node a and node b, a transmission path connecting node a and node C, etc., respectively.

Each node 31 in FIG. 3 accommodates an arbitrary number of terminal devices 33, and transmits and receives data between the terminal devices accommodated in arbitrary nodes via a transmission path 32.

A dedicated klA 34 for transmitting a monitoring signal is individually installed for each node between the monitoring device 30 and each of the nodes 31a to 31e.

The configuration of Conventional Example 1 is uneconomical in terms of line installation and maintenance because the monitoring transmission line is provided separately from the data transmission line.

Fig. 4 (al.
The method of Conventional Example 2 shown in FIG.

In this Figure 4 (al), 40 represents the monitoring device, 42 represents the node, 41 represents the monitoring processing unit of each node, 43 represents the transmission path, and the letters a to e attached to the numbers refer to the explanations for Figure 3 above. This figure 4 has the same meaning as ta.
Although terminal devices are not shown in +, an arbitrary number of terminal devices are naturally connected to each node.

In the method of conventional example 2, a monitoring path is set up on the network through which the monitoring device 40 transmits data, and each node is connected to which monitoring processing unit to express the status of each node and the status of the transmission path. The data is transmitted to the monitoring device 40 to detect whether it is operating normally or whether an abnormality has occurred.

Normal data is mutually transmitted through all the transmission paths 43 connected in a network between each node, but in addition to this data transmission path, there is a monitoring path for transmitting monitoring data. It is provided along the route shown by the arrow in Figure 4 (al).

That is, from the monitoring device 40 to the monitoring processing section 41a1 of the node 42a, via the transmission line 43ac, to the monitoring processing section 41c of the node 42c, and to the node 42 via the transmission line 43ab.
b is connected to the monitoring processing unit 41b, and further connected to the node 42
b to node 4 via transmission paths 43bd and 43dQ, respectively.
2d monitoring processing unit 41d and node 42e monitoring processing unit 4
1e.

In the configuration of Conventional Example 2, a method for setting a monitoring path and establishing a monitoring path when a failure occurs will be described below.

The monitoring device 40 is equipped with a management table as shown in FIG. When the monitoring device 40 receives the response, it issues an instruction to set a network monitoring path to the next node.

When the monitoring path is set and monitoring is working normally,
In the management table, as shown in (a), a black circle indicates that a monitoring path is set at the intersection between each node, and a white circle indicates that a data transmission path is set.

When a failure occurs in a transmission path in this network system, a response cannot be received from the corresponding node, so the transmission path failure at the corresponding location is detected. For example, when the monitoring device detects that a fault has occurred in the transmission path 43ab, the monitoring device 40 displays the fault as an X mark at the corresponding location in the management table, as shown in FIG. The device 40 determines whether the transmission path 4 is normal according to the management table.
A network monitoring path for 3aC is set, and then the node 42C is instructed to set up a node between nodes 42c and 42b. When the monitoring device 40 receives the completion of the monitoring path setting, it then instructs the node 42b to set up a monitoring path with the node 42d. Thereafter, the management table of the monitoring device 40, in which network monitoring paths for all nodes are similarly set, is set as shown in FIG. 4 [bl].

[Problems to be Solved by the Invention] According to the method of Conventional Example 2, when setting the monitoring path of a network system and when switching the monitoring path in the event of a failure, each time the monitoring path between each node is set, , the monitoring processing unit of each node receives a node setting instruction from the monitoring device, and when the setting is completed, it must respond to the monitoring device to complete the setting. If there is no response, it will send the monitoring path setting instruction to the next node. There was a problem in that it took time to set up and switch the monitoring path because the information was not sent.

Furthermore, since the setting of the route of the monitoring path is performed based on a fixed management table provided in the monitoring device, there is a problem that there is no flexibility and it is difficult to promptly deal with a transmission path failure.

The present invention provides a network monitoring path switching method in which the status of nodes and transmission paths is monitored using a monitoring path set on a data transmission path of a network system, in which the monitoring path is quickly switched in related nodes when a failure occurs. The purpose is to provide

[Means for solving problems] The basic configuration of the present invention is shown in FIG.

In FIG. 1, 1 is a monitoring device, 2 is a node, 3 is a monitoring processing section of each node, 4 is a transmission path, 5 is a management table held by the monitoring processing section of each node, and 6 is a terminal device.

The alphabets attached to each number represent each node a to e, as in the drawing showing the configuration of the conventional example, and ■ to ■ represent monitoring paths.

The network monitoring path switching method of the present invention provides a management table in each node, and when a failure occurs, the monitoring path is switched based on the information in the management table without any instructions or responses from the monitoring device. This allows settings to be made.

[Operation] Each node 2 accommodates an arbitrary number of terminal devices 6, and mutually transmits data via the time division multiplexed transmission path 4.
In order to monitor the state of the network, the monitoring device 1 calls the monitoring system processing unit 3 of each node and causes it to transmit state information.

Connection between the monitoring device 1 and the monitoring system processing unit 3 of each node 2 is performed via a network monitoring path.

The management information table 5 held in the monitoring system processing unit of each node includes monitoring path information representing the upper and lower nodes currently connected to the own node, as well as information on paths from the own node to other nodes. Priority information (information indicating the order in which higher stations are selected at the time of switching) is held.

First, the network monitoring path is as shown in Figure 1.
, ■, ■, ■. If the transmission line 4ab is disconnected while the monitoring operation is being performed in this state, the node 2b cannot receive data and therefore detects the occurrence of a failure. As a result, the monitoring system processing unit 3b of the node 2b transmits data to the node 0 based on the priority information (in this node b, the order is a, c, e, d) from the management information 5b it holds. Monitoring path setting via route 4bc 1! ! Send (request).

When node C accepts this, it opens a monitoring path with node b, and returns a response to node C to the effect that it has been accepted. The principle of setting a monitoring path is that the monitoring device and the monitoring system processing section of a node, or the monitoring system processing sections of each node
A connection path is formed in the same way as each terminal device,
However, the connection path of the monitoring path occupies any one of a plurality of time slots reserved in advance for monitoring.

In response to this path switching, each monitoring system processing unit 5 of each node a, b, c, etc. rewrites the management information in accordance with the route of the monitoring path after switching.

Network monitoring paths are sequentially opened in a similar manner when a network system is constructed or expanded.

[Example] The configuration of an example of the present invention is shown in Fig. 2+a+ to Fig. 2+d+.
Shown below.

Figure 2 fat shows the configuration of the nodes shown as a''-'e in Figure 1, 20 is a node, 21 is an interface board with the transmission line, and is a transmission device that transmits and receives multiplexed data to and from the transmission line. 22 is a multiplexing unit that multiplexes data from each channel board and distributes the multiplexed data to each channel board; 23 is a monitoring system processing unit that controls the monitoring path on the transmission path and performs switching and distribution; , 24 represents a channel board that is connected to each terminal device and serves as an interface between the terminal device and the multiplexing unit, and 26 represents a transmission line connected to the opposite device for multiplexed data transmission.

A management information table is provided in the memory of the monitoring system processing unit 23, and includes monitoring path management information 231 and priority management information 2.
32 is stored, and information 234 representing the status of nodes and transmission paths is also stored, and the status information data is sent to the monitoring device 1 (see Figure 4) via the monitoring path (polling). .

Here, in the management information table of the monitoring system processing unit of each node a%6 in Fig. 1, (a) and (b) in Fig. 2 (bl)
Assuming that priority management information and monitoring path management information as shown in FIG. 2C are stored, the operation flow of the processing unit shown in FIG. I will explain using

When a failure occurs in the transmission path 4ab, the transmission and reception of data via the monitoring path is stopped, so failure detection of path disconnection is performed at each node involved. At this time, the node b connected to the transmission path 4ab determines that the monitoring path with the upper station node a is at fault in step 110 of FIG. )) and disconnect (release) that path under monitoring path control.

Next, the monitoring system processing unit of node b sends the message to node C, which has the next priority after the disconnected node a, based on its own priority management information (see (a) in FIG. 2(b)).

A higher order request is sent (130 in Figure 2+c+).

When a request acceptance response is returned from the higher-level node C in response to this request (140), the requesting higher-level node C
A monitoring path is set between node b and the new upper station C is registered as an upper station in the monitoring path management information in the management information table of node b.

On the other hand, when node a of the upper level station detects that the monitoring path with node b has been disconnected due to a transmission path failure because it cannot receive monitoring data from the lower level, it deletes node b from the monitoring path management information. and disconnects the monitoring path (160 in FIG. 2 (C1)).

In addition, when node C, which is another higher-level station, receives a higher-level station request request from node b (70), it sends a request acceptance response to node b, connects the monitoring path, and manages the monitoring path. Register the node b as a subordinate station in the information (
180).

As a result of the monitoring path switching process after this failure, the newly set monitoring path management information for each node becomes as shown in (c) in Figure 2 (bl), where node a becomes only node C as a lower station, The upper station of node b is changed to C, the lower stations are the same as nodes d and e, and node C is changed in that node b is set as the lower station.

Next, the configuration of the monitoring path of the monitoring system processing unit will be explained with reference to FIG. A switching circuit that switches and sets the path to the upper station and the lower station, or disconnects the path, 52 is an OR circuit, 53 is a monitoring processing unit, A, B
, C are terminals for connecting the network JFflF monitoring path.

In this figure, the upper station is connected to the monitoring path of terminal B, and the lower station is connected to the monitoring path of terminals A and C. When the monitoring processing unit 53 detects a call status information transmission command by the monitoring device through the monitoring path (assigned time slot) from the higher-level station at terminal B, the monitoring system processing unit Status information is transmitted through the OR circuit 52 to the monitoring device (1 in FIG. 1), and instructions to lower stations are sent to terminals A and B as they are.

The data of the upper station request appearing at terminal A or B from the lower station is included in the output of the OR circuit 52, and is sent to the monitoring processing section 5.
3, the identification bit is determined to detect the request from the upper station. Then, response data indicating that the request from the upper station has been accepted is sent from the monitoring processing unit 53 to terminal A or C of the monitoring path to the lower station.

FIG. 2 (el) shows an example of the data structure on the monitoring path.

When each node requests an upper station from the opposing node,
The request/acceptance bit in the data structure of tel in Figure 2 is set to “1”.
” to notify the upper station request on the opposite node, wait for the request/acceptance bit to be returned as “1” from the upper station (through the reverse direction path), and when “1” is received, the opposite node It is assumed that the request from the upper station has been accepted.

Also, the data on the monitoring path shown in Figure 2 (el) is considered valid if the request/acceptance bit is "1", and by setting this bit to "1", it is determined that the monitoring path is connected. Process that data.

Note that circuits for multiplexing and transmitting data on a multiplex transmission path and circuits for separating data from a multiplex transmission path are conventionally known, and it goes without saying that these circuits can be implemented using these techniques.

[Effects of the Invention] According to the present invention, when a failure occurs in the transmission path, each node has priority information and the node that detects the failure in the monitoring path independently detects a detour for the monitoring path.
It is possible to reduce the processing of the monitoring device, shorten the time from the occurrence of a failure to setting a detour, and build a highly reliable monitoring network.

Furthermore, since the monitoring path selects a possible route for the conventional transmission line according to the priority order at each node, it is possible to realize a more flexible switching method than in the conventional case where a fixed detour route is set.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of the present invention, FIG. 2 is a diagram showing the configuration of an embodiment of the present invention, FIG. Figure, 2nd
Figures (bl is a diagram showing the configuration of the management information table of the monitoring system processing unit, Figure 2 (C1 is a diagram showing the operation flow of the monitoring system processing unit, Figure 2 (dl is a diagram showing the block configuration of the monitoring system processing unit) 2 (el is a diagram showing an example of the monitoring path data structure,
3 is a diagram showing the configuration of conventional example 1, and FIG. 4 (al) and FIG. 4 (b) are diagrams showing the configuration of conventional example 2 and an explanatory diagram of the management table. Device 2: Node 3: Monitoring system processing unit, 4: Transmission path 5: Management table 6: Terminal device

Claims (1)

[Claims] In a network system in which a plurality of nodes (2) accommodating an arbitrary number of terminal devices are connected in a network by a transmission path (4), each node is connected by a network monitoring path set via the transmission path. Equipped with a monitoring device that monitors nodes, each node has monitoring path management information that displays the upper and lower relationships of each transmission path connecting the own node and other nodes, and the order of other nodes to be connected to from the own node with priority. a monitoring system processing unit equipped with a management table (5) consisting of priority management information for displaying priority management information;
A network monitoring path switching method characterized in that setting and switching of the network monitoring path is performed based on the management table between the monitoring path and the monitoring system processing unit of each node.