JPH0425244A - Duplicating line switching system for network - Google Patents

Abstract

PURPOSE:To attain high speed duplicating line switching for the network by using each data communication equipment to switch it to a standby system line when the lines are in duplicate. CONSTITUTION:This system is provided with a network management equipment 1 managing the state and the configuration of the network, time division multiplexers 2-4 having fixed communication route information and accommodating a host computer and a terminal equipment, etc., for multiplex communication, and relay lines 5-8 interconnecting them, and the relay line 6 is especially of full duplex constitution and the relay line 7 is represented by the terminal block branching service of NTT superdigital line. Then plural pieces of configuration information are distributed from a network management layer to each data communication equipment and in the case of the occurrence of a line fault, when the line is the duplicated line, the standby system line is selected without awaiting a switching instruction from the network management equipment. Moreover, the network management equipment confirms the switching to notice the fault of the active line. Thus, high speed duplicate line switching is attained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a network line switching system, and is particularly applicable to each data communication device such as a time division multiplexing device that has fixed communication route information within the network. By high-speed switching of duplicated trunk lines.

The present invention relates to a duplex line switching system suitable for reducing the range of influence in the event of a line failure.

[Conventional technology]

In networks, the reliability of the relay lines that connect each data communication device has become an important factor as networks become larger and more complex, and measures such as duplication of relay lines are being taken. There is.

The conventional line switching method, as described in Japanese Unexamined Patent Publication No. 64-27334, is a method in which two systems of equipment are provided corresponding to the lines, and the cost of the equipment and the operation of the entire network are not particularly considered. It wasn't.

Furthermore, a method of distributing multiple pieces of configuration information from a network management device to each data communication device in advance and switching one piece of communication route information based on a switching instruction from the network management device is described in Japanese Patent Laid-Open No. 63-217744. However, the switching method for redundant lines was not considered.

[Problem to be solved by the invention]

The above-mentioned conventional technology is related to the switching of redundant trunk lines that connect each data communication device, and takes into account the cost of the device, the operation of the entire network using the network management device, and the reduction of the impact on the data communication line. However, there were problems such as network operation and high equipment costs.

An object of the present invention is to enable a data communication device to automatically write configuration information of a corresponding line in a data communication network consisting of a network management device, each data communication device, and a plurality of relay lines connecting each data communication device. The object of the present invention is to solve the problems of the prior art and provide a low-cost, high-speed network redundant line switching system in which the data communication line is less affected by disconnection of the communication route by switching to the standby line.

[Means for solving the problem] The above purpose is to distribute a plurality of pieces of configuration information to each data communication device in advance from the network management device, so that when a failure occurs in the redundant line, the data communication device can This is achieved by switching to the backup line without waiting for a switching instruction from the device, and by notifying the network management device of a fault in the active line after acquiring status information.

[Effect]

Each data communication device is distributed with a plurality of pieces of configuration information in advance from the network management layer, and when a line failure occurs, if the line is a duplicated line, it can be switched without waiting for a switching instruction from the network management device. Switch to the backup line. When the network management device detects a line failure, if the line is a duplicated line, it does not perform failure diagnosis or instruct configuration information switching.
By acquiring status information, confirming switching to the protection line, and notifying the active line of failure, high-speed redundant line switching becomes possible.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings in the case of a transmission network in which the data communication device is a time division multiplexing device.

FIG. 1 shows the configuration of a transmission network that is an embodiment of the present invention, and shows an embedded network pipe M for managing the status and configuration of the network.
l. A host computer with fixed communication route information;
Time division multiplexing device 2 that accommodates terminals and performs multiplexed communication
~4. Relay lines 5 to 8 connecting these (in particular, the relay line 6 has a duplex configuration throughout the entire section, and the relay line 7 has a configuration typified by the terminal section branching service of the NTT Super Digital line), network management device 1 Configuration information 13 defining the memory 9 in the internal memory 9 and the communication route of the entire network.
Configuration information 14 to 16 unique to the time division multiplexing devices 2 to 4 distributed from the network management device 1 to the time division multiplexing devices 2 to 4 and memories 10 to 12. and terminals 17 to 19 accommodated in time division multiplexers 2 to 4.

FIG. 2 is a block diagram of each time division multiplexer 21. Memory 22. subscriber line.

Of the configuration information that defines communication routes between relay lines, active configuration information 23. A configuration information difference extraction unit 24 that checks whether the line has a redundant line configuration and extracts the difference in configuration information. Difference information 25. Configuration information 262 distributed from the network management device 1 Terminals 27 accommodated in the time division multiplexing device 21 . and.

It is composed of a relay line 28 for connecting to other time division multiplexing devices.

FIG. 3 and FIG. 4 are diagrams showing an overview of communication route changes due to switching of redundant lines in the network. Relay lines 5 to 8 connecting these
(In particular, the relay line 7 has a configuration typical of the terminal section branching service of the NTT Super Digital line.), and the terminals 31 to 34 accommodated in the time division multiplexers 2 to 4. Ru. The terminal 31 is connected to the terminal 32 by a communication route 35, and the terminal 33 is connected to the terminal 34 by a communication route 36. When a terminal section line failure 38 of the relay line 7 occurs, the line is switched to a backup line. ,
Terminal 33 is connected to terminal 34 via communication route 37.

5 and 6 show the case where the trunk line 6 has a duplex configuration in all sections, and as in FIGS. 3 and 4, when a line failure 58 occurs, the line is switched to the backup line and the terminal 51 is connected to the terminal 52 via a communication route 57.

However, in FIG. 3, FIG. 4, FIG. 5, and FIG. 6, host computers, terminals, etc. accommodated in the time division multiplexers 2 to 4 that are not directly related to the description of the present invention are shown. is omitted.

FIG. 7 shows an overview of the processing in the network management device 1 when switching over redundant lines in the network. First, when a fault in the network is detected (71), the configuration is checked (72).
If the fault is defined in a redundant line, a fault notification is sent to the active line (76), and the process ends. In the case of other failures, a failure diagnosis is performed (73), a communication route is defined in advance to deal with the failure, and an instruction is issued to switch to the configuration information distributed to the time division multiplexers 2 to 4. (74), receives a switching completion report from the time division multiplexers 2 to 4 (75), and ends the process. Here, the redundant line performs processing after fault diagnosis only when both the working and standby lines become faulty.

FIG. 8 shows an outline of the processing performed by the time division multiplexers 2 to 4 when switching the duplex line of the network. First, when the time division multiplexing devices w2 to w4 detect a failure in the device or the line connected to the device (81), they check the configuration.
2) If the faulty line has a redundant line configuration defined, the corresponding line information is read from memory (88), and information on the corresponding line part of the operating configuration information (difference information 25)
By rewriting , the line is switched to the backup line (89), and the process ends. In case of other disorders,
When the time division multiplexing devices 2 to 4 receive the switching instruction from the network management device 1 (83), they read the instructed configuration information 14 to 16 from the memories 10 to 12 (84), and use the read configuration information and operation information. A difference is extracted from the configuration information 23 inside (85), and if there is a difference, only the difference information 25 is rewritten in the active configuration information 23 (86), and the process ends. If there is no difference, a switching completion report is made (87) without rewriting the configuration information, and the process ends.

Next, an example of redundant line switching in a network according to the present invention will be described with reference to the above diagrams, focusing on changing the communication route 36 between the terminals 33 and 34.

Note that examples other than duplex line failures that are not directly related to the description of the present invention are omitted.

First, in the network management device 1, the terminal 31 is connected to the terminal 32 via the communication route 35, and the terminal 33 is connected to the terminal 34 via the communication route 36.
The relay line 7 connected to the time division multiplexing device 3 has configuration information defined in advance so as to have a duplex configuration as typified by the terminal section branching service of the NTT Super Digital line. Distributed to ~4, memory 10
- 12, and upon a switching instruction from the network management device 1, the operation according to the operation mode shown in FIG. 3 is started. Here, if a line failure 38 occurs in the relay line 7, the terminals 33, 34
When the multiplexing device 3 detects a line failure, it checks whether a duplex line has been defined, and if it is a duplex line, it receives a switching instruction (7) from the network management device 1.
4), by rewriting only the difference information 25 of the active and protection line definition parts of the relevant line information and switching the active configuration information 23 to the protection line, the communication route 37 Communication between terminals is now possible, and redundant line switching is possible with less impact from communication interruptions. In the network management device 1, when acquiring status information from the time division multiplexing device 3,
Detects switching to the backup line and notifies the operator of the occurrence of a failure in the active line.

The above explanation also applies when two relay lines 6 are provided between the time division multiplexers 2 and 4 over the entire section as shown in FIG. 5, and are used as working and protection lines. This can be easily handled in the same way as the case shown in Figure 3.

〔Effect of the invention〕

As explained in detail above, according to the present invention, unlike the conventional system, when the lines are duplexed, each data communication device switches to the backup line, so that two systems of equipment can be used. It is possible to perform high-speed network redundant line switching without the need for a line failure, which reduces the influence of line failures on other communication routes.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a transmission network according to an embodiment of the present invention. FIG. 2 is a block diagram of each time division multiplexing device, and FIG. 3 is a block diagram of each time division multiplexing device. Figures 4, 5, and 6 are overview diagrams of communication route changes due to duplex line switching, Figure 7 is a diagram showing an outline of processing in the network management equipment, and Figure 8 is a diagram showing the outline of the processing in the network management equipment. FIG. 2 is a diagram showing an outline of the process. DESCRIPTION OF SYMBOLS 1...Network management device, 2-4...Time division multiplexing device, 5-8...Relay line, 9-12...Memory, 13-16...Configuration information, 17-19. ...terminal, 23...configuration information during operation, 24...difference extraction unit of configuration information. 25...Difference information, 35~37.55~57...Communication route. 38.35...Line failure.・This 1. Bulk! Illustrated collection of illustrations + Illustrated collection of illustrations

Claims (1)

[Claims] 1. One or more data communication devices, a network management device that controls the configuration of each data communication device, and one or more devices that connect the data communication devices to each other and between the data communication devices and the network management device. In a data communication network consisting of multiple relay lines, a network management device distributes multiple pieces of configuration information defined in advance to each data communication device according to the network operation mode, and the active system of redundant relay lines is A redundant line switching method for a network, characterized in that when a line fails, the data communication device automatically switches to a backup line without waiting for a configuration information switching instruction from a network management device.