JPH11355392A - Duplicate system changeover system and its program recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continue network communication without interruption in the case an active system is replaced with a standby system by allowing only the active system to execute network communication processing, starting the standby system so as to be brought into operation at all times, allowing the active system and the standby system to conduct inter-system communication in real time and updating in-network setting of the standby system synchronously with the active system. SOLUTION: In a multi-protocol switch that includes an active system 10 that makes network communication and a standby system 20 that is selected on the occurrence of a fault in the active system 10 to continue the network communication, the active system 10 and the standby system 20 conduct inter- system communication 34 to make in-network information of them coincident at all times, and on the occurrence of a fault in the active system 20 during its operation, the standby system 20 is immediately selected to start operation so as to continue the network communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duplex system switching system and a program recording medium therefor, and more particularly to a duplex system switching system in a duplex multiprotocol switch having an active system and a standby system and its program recording medium.

[0002]

2. Description of the Related Art FIG. 9 is an explanatory diagram showing an operation example of a duplex system switching system in a conventional multiprotocol switch. In the figure, even if the active system 110 ends the activation (111) and the in-network setting (112) and starts the operation of network communication (113), the standby system 120 is generally in the activated (121) state. .

When a failure occurs in the active system 110 and it is detected (114), network information is communicated from the active system 110 to the standby system 120 (112i), and the standby system 120 sets the network according to the network information. (122) and the operation of network communication (123) is started. After that, the active system 110 starts the failure recovery work (115).

[0004] When the system is switched from the active system 110 to the standby system 120 as described above, network communication is interrupted until the standby system 120 fetches in-network information and completes the setting.

[0005]

As described above, the conventional redundant system switching method uses the active system in the processing of the active system and the standby system in a case where the network information is not transmitted to the standby system when the active system is operating. However, there is a disadvantage that the network communication is interrupted until the multi-protocol switch is switched to the standby system after the occurrence of the failure and the multi-protocol switch can be used in a state synchronized with the active system.

An object of the present invention is to provide a dual multi-protocol switch comprising an active system and a standby system, in which network communication processing is executed only by the active system, but the standby system is activated so that the standby system can be operated at all times. Duplexing that performs real-time communication between the system and the standby system, updates the network settings of the standby system in synchronization with the active system, and continues network communication without interruption when the active and standby systems are switched An object of the present invention is to provide a system switching method and a program recording medium thereof.

[0007]

According to the present invention, there is provided a redundant multi-protocol switch including a working system for performing network communication and a standby system for switching when a failure occurs in the working system and continuing the network communication. Perform inter-system communication to always match the information in the network between the working system and the standby system, when the active system has a failure during operation, immediately switch to the standby system and start operation,
The network communication is performed continuously.

Further, in the redundant system switching system according to the present invention, the working system and the standby system communicate with each other between the own system and the other system, and a network for holding network information during network communication operation. Local information storage area, and duplex management means for detecting when the information in the network is changed, communicating the changed information in the network via the communication means to another system, and matching the information in the networks of the respective systems, respectively. Have.

Further, the redundant system switching system according to the present invention includes a shared memory between the active system and the standby system for storing network information, the shared memory being accessed only from the active system, Can access the shared memory when switched to the active system.

Further, in the redundant system switching method according to the present invention, the shared memory stores a current setting state storage unit for storing current network information, a previous setting state storage unit for storing immediately previous network information, and a current setting state storage unit. A difference information storage unit for storing a difference between the intra-network information and the immediately preceding intra-network information.

A program recording medium of the dual system switching system according to the present invention is a dual multiprotocol switch including a working system for performing network communication and a standby system for switching when the working system fails and continuing the network communication. The active system starts up its own system, sets and operates network information related to network communication, a first step, communicates the network information to another system, a second step, and the network information changes. A third step of immediately changing the settings of the in-network information when it becomes, a fourth step of immediately communicating the in-network information changed by the third step to another system, and a failure in the own system. A fifth step of requesting switching to another system, wherein the standby system activates its own system simultaneously with the activation of the active system, and the active system communicates with the sixth step. A seventh step of setting the in-network information in the own system by the in-network information, and an eighth step of resetting the in-network information of the own system by the changed in-network information communicated by the working system, A ninth step of detecting that a failure has occurred in the active system and starting operation of network communication.

Further, in the program recording medium of the duplex system switching system according to the present invention, when the standby system is communicating with the standby system when a failure occurs in the active system, the communication content is the information in the previous network. In the case of, the non-recording setting information after the occurrence of the failure is fetched from the held current setting state information,
When the communication content is the difference information between the current setting state and the previous setting state, the non-recording setting information after the occurrence of the failure is fetched from the held difference information, the own system is enabled by the fetched information, and the network communication is operated. It is realized as follows.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, a redundant system switching system according to the present invention is a redundant multi-protocol switch including a working system 10 for performing network communication and a standby system 20 for switching when the working system fails and continuing the network communication. And the standby system performs inter-system communication 34 for constantly matching information in the network. When a failure occurs during operation of the active system, the system immediately switches to the standby system and starts operation. Is performed continuously.

Here, the active system 10 and the standby system 20 communicate with the communication units 13 and 23 for performing communication between the own system and the other system, and the in-network information storage for holding the in-network information during network communication operation. Duplication management means 11 and 21 for detecting the change in the network information and for communicating the changed network information to other systems via the communication means and for matching the network information of each system with areas 12 and 22. Respectively.

Further, the dual system switching system of the present invention includes a shared memory 30 for storing network information between the active system and the standby system, wherein the shared memory is accessed only from the active system, and The system can access the shared memory when switching to the active system.

Further, in the redundant system switching system of the present invention, the shared memory 30 has a current setting state storage section 32 for storing current network information, and a previous setting state storage section 31 for storing the immediately previous network information. And a difference information storage unit 33 for storing a difference between the current network information and the immediately preceding network information.

Data relating to network communication is input from an input line 35 and output via an output line 36.

In FIG. 1, in a redundant multi-protocol switch composed of an active system 10 that performs data processing during operation and a standby system 20 that is switched to the active system when the active system fails, each system that can be set from the outside One system becomes the active system based on the current system / standby system setting. For the purpose of monitoring the failure of the system and managing the movement of the system, the redundant management means 11 of the active system and the redundant management means 21 of the standby system are set, and when a failure occurs in the system, the redundant management means 1 is set.
1 changes the system from the active system to the standby system.

Further, there is a shared memory 30 that can read and write from the active system but cannot perform writing and reading at all from the standby system so that the network communication can be switched without interruption. The shared memory 30 has three parts: a pre-setting state storage unit 31 and a current setting state storage unit 32 for recording network settings, and a difference information storage unit 33 for storing difference information between the previous setting state and the current setting state. Use them separately. The active redundant management means 11 is used for controlling access to the shared memory and the active communication means 13, and the standby redundant management means 21 is used for controlling access to the standby communication means 23.

FIG. 2 is an explanatory diagram showing the operation of the above-mentioned dual system switching system. In the figure, after the active system 10 is activated (41), it performs network setting (42) and then activates network communication (43). At the same time, the standby system 20 is activated (51).
I do.

The active system 10 transfers the information (42i) from the active system 10 to the standby system 20 by inter-system communication. The standby system 20 sets the network based on the information (42i) in the network. (52) is performed. The working system 10 has the information in the entire network (42i).
When the setting change (44) in the network occurs in the active system 10 after the transfer, the difference network information (44i) is transferred from the active system 10 to the standby system 20, so that the network setting (44) in the standby system 20 is performed. 53) is performed.

Similarly, a change in the network setting (4
When 5) occurs, by transferring the difference network information (45i) from the active system 10 to the standby system 20, the standby system 20 is transferred.
Then, the above-described processing is repeated to synchronize the network information of the active system and the standby system during operation.

When the active system 10 has a failure (46), system switching from the active system 10 to the standby system 20 occurs, and after the standby system 20 is operated (55), the active system 10 performs a recovery operation (4).
Perform 7).

FIGS. 3, 4, and 5 are flowcharts showing the operation of the inter-system communication. Referring to the figure, if the standby system starts up after the active system is activated (61, 62), the active system collects all the setting information in the network (63) and stores it in the current setting state storage unit of the shared memory. Record (64). Thereafter, the contents of the current setting state storage unit are recorded in the communication means of the standby system (65).

Considering that the intra-network information cannot be transferred by one-time communication due to the capacity of the intra-network information, the current setting state storage unit in the shared memory is replaced with the standby communication unit as the content to be written to the standby communication unit. And the number of times the current recording to the standby communication means corresponds to the total number of times when recording is performed using. If a failure occurs in the active system at the time of recording, the contents of the current setting state storage unit in the shared memory are retransmitted (66).

In this manner, the contents recorded from the active system to the standby communication means are read from the standby communication means by the standby redundant management means each time the standby system receives the contents, and are stored in the standby network. Record in the information storage area. When all the network settings are received and stored in the standby network information storage area, the standby dual management unit validates all network settings for the system (67). When the standby system redundancy management unit validates the setting, the standby system records a normal response to the active system in the active communication unit (68, 70), and records an abnormal response in the case of failure (69).

When the active system receives the abnormal response, it retransmits the contents of the current setting state storage unit in the shared memory. If the response is a normal response, in the subsequent inter-system communication, if the setting status in the entire network is transferred from the working system through the communication means, the synchronization time between the working system and the standby system will be out of synchronization due to the transfer time. May occur.

Therefore, the active system redundancy management means monitors whether or not a change has occurred in the settings in the active network (71). When the change is recognized, the contents of the current setting state storage unit in the shared memory previously transferred Is copied to the previous setting state storage unit (7
2) The state of the network settings of the active system at the time of the change is collected (7)
3) Record in the current setting state storage unit (74), compare the previous setting state storage unit with the current setting state storage unit, and record the difference in the difference information storage unit (75).

If there is a difference in the difference information storage unit, the active system duplication management means records the difference information storage unit in the standby communication means (76). Also in this case, the total number of transfers in the case where the contents of the difference information storage unit are transferred using the standby communication means and the number of the current number of times recorded in the standby communication means corresponds to the standby system are recorded. Record in the communication means.

In the standby system, when the contents of the communication means are stored in the information storage area in the standby network and all the difference information is received, the standby redundant management means makes the difference effective for the setting in the network of the standby system. (77, 78). Thereafter, the standby system records the received difference information in the active communication unit (79), thereby notifying the active system of the state of the in-network setting of the standby system, and the network of the active system and the standby system. Synchronize internal settings.

The active system compares the received difference information with the difference information storage unit in the shared memory (80). If the results of the comparison do not match, the process proceeds to step 65, and the current setting state storage unit is re-transferred to the standby communication unit. If the comparison results in a match, the process proceeds to step 71, where the current setting state storage unit is copied to the previous setting state storage unit at the timing when the network setting is changed, and the current setting state storage unit stores the network setting. The in-network setting to which the change has been added is recorded, and the difference information storage unit is also updated. After updating the difference information, the same procedure as above is performed.

FIG. 6 is a flowchart showing the operation when a failure occurs in the active system. In the figure, when a failure occurs and the system is switched to the standby system (91, 92), a failure occurs in the active system while setting information or difference information in the active system is recorded in the standby communication means from the active system. When this occurs (93), the shared memory that could previously be read and written only from the active system can be read and written only from the standby system instead of the active system, and the shared memory difference information storage unit Read difference information (94, 96)
Alternatively, difference information is read from the current setting state storage unit in the shared memory (95). At this time, the standby system is synchronized with the network setting state of the active system by reading the in-network information method after the individual number through the overall number and the individual number added to the network information stored in the standby communication means. Can be taken.

Then, the standby system validates the fetched information and continues the normal operation (97, 98).

Next, the operation of the above-mentioned duplex system switching system will be described more specifically.

FIG. 7 is an explanatory diagram showing the flow of information in the network. In the figure, when an ATM switching system for exchanging information in an asynchronous transmission mode is used as a processing system, one of the duplicated systems, which is set from the outside, becomes a working cell switch processing system and an input line. AT entered from
The M cell data is input, processed, and output only to the active system 10, and is not input to the standby system 20.

The active system 10 starts up, and AT is used as network information.
When operating according to the routing information and the in-switch setting information, which are the path information of the information in the M network, these information are first recorded in the current setting state storage unit 32 in the shared memory. It is assumed that the in-network information includes the in-network information 1 to the in-network information 9 and that only one unit of the in-network information can be transferred to the active communication unit 13 and the standby communication unit 23.

When the standby system 20 is activated after the active system 10 has been activated, the redundant management means 11 of the active system sends the in-network information 1 to the in-network information 9 which are all the in-network information to the standby system. To the standby communication means 23, the total number of in-network information and the number of currently transferred in-network information are, for example, 5/9.
Is recorded as additional information 100 such as This is because, if a failure occurs in the active system during recording, for example, while transferring the in-network information 7, system switching is performed, but the standby system stores all in-network information in the current setting state storage unit 32 in the shared memory. The system switching is performed without interrupting the network communication by reading only the in-network information 7 instead of the network information.

After the information in the entire network is transferred from the active system to the standby system through inter-system communication, the standby system validates the information in the entire network to the system, and then returns a normal response to the communication means 13 of the active system. To record. If abnormal, record the abnormal response.

FIG. 8 is an explanatory diagram showing the flow of difference information. In the figure, the redundant management means 11 of the active system transfers the in-network information 9 from the in-network information 1 which is the information in the entire network to the standby system 20 from the active system 10 and the standby system normally returns to the system. Then, in the active system, the duplication management means 11 monitors whether or not the setting has changed. When the information in the active network is changed, the contents of the current setting state storage unit 32 in the shared memory are copied to the all setting state storage unit 31, and the information in the entire network at the time of the change is duplicated in the active system. 11
Is collected and recorded in the current setting state storage unit 32.

Thereafter, the current setting state storage unit 32 and the all setting state storage unit 31 are compared, and the difference (for example, the current setting state is the same from the in-network information 1 to the in-network state 6 and the in-network information 7 is different from the in-network information 9, which are referred to as in-network information 7 ', in-network information 8', and in-network state 9 '). 8 ′ Network information 9 ′ is recorded in the difference information storage unit 33. Then, the redundant management unit 11 of the active system transfers the in-network information 7 'and the in-network information 8' from the difference information storage unit 33 to the communication unit 23 of the standby system. And apply the difference information to the system to make it valid. If the information can be validated, the network information 7 ′, the network information 8 ′, and the network information 9 ′, which are the difference information received from the active system, are transferred from the standby system to the active communication unit 13.
To record.

While the difference information is being recorded from the active system 10 to the communication means 23 of the standby system, the transfer information is also included in the difference information transfer in consideration of the fact that a failure occurs in the active system and system switching occurs. It is assumed that the total number of information in the differential network and the number of differential network information currently being transferred are transferred with additional information 101 such as ／.

When a failure occurs in the active system due to such redundant inter-system communication, the setting of the standby system is valid in the standby system which is transferred immediately before the failure of the active system and recorded in the information storage area in the standby network. Operate based on certain network information. At this time, the in-network information insufficient due to the failure of the active system is read from the shared memory and made valid.

In the above specific example, the case where the number of in-network information is nine has been described, but the present invention is not limited to the number of in-network information.

Note that the above-described dual system switching system operates by executing a program stored in a main memory (not shown). This program is usually stored on a hard disk or floppy disk,
During operation of the system, it is loaded into the main memory when the active system and the standby system are started.

[0046]

As described above in detail, according to the present invention, network communication is executed only in the active system, but when the active system and the standby system are switched, the network communication is continuously performed without interruption. Can be.

The reason is that the standby system is started in a state where it can always be operated, the active system and the standby system perform inter-system communication in real time, and the network settings of the standby system are updated in synchronization with the active system. Because they do.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing operations of a working system and a standby system.

FIG. 3 is a flowchart showing the operation of inter-system communication.

FIG. 4 is a flowchart showing the operation of inter-system communication (continued).

FIG. 5 is a flowchart showing the operation of inter-system communication (continued).

FIG. 6 is a flowchart showing an operation at the time of a failure.

FIG. 7 is an explanatory diagram showing a flow of information in the network.

FIG. 8 is an explanatory diagram showing a flow of difference information.

FIG. 9 is an explanatory diagram showing the operation of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Working system 11, 21 Duplication management means 12, 22 Information storage area in network 13, 23 Communication means 20 Standby system 30 Shared memory 31 Previous setting state storage part 32 Current setting state storage part 33 Difference information storage part 34 Inter-system communication 35 Input line 36 Output line

Claims (6)

[Claims] 1. A duplex multi-protocol switch including a working system for performing network communication and a standby system for switching over when a failure occurs in the working system and continuing the network communication, wherein network information is provided between the working system and the standby system. Is always performed, and when a failure occurs during operation of the active system, the system is immediately switched to the standby system to start operation, and the network communication is continuously performed. System switching method. 2. The redundant system switching system according to claim 1, wherein said active system and said standby system hold communication means for performing communication between the own system and another system, and hold information in the network during network communication operation. A network information storage area, and duplex management means for detecting when the network information has been changed, communicating the changed network information to another system through the communication means, and matching the network information of each system. , And a dual system switching system. 3. The redundant system switching system according to claim 1, further comprising: a shared memory between said active system and said standby system for storing network information, wherein said shared memory is accessed only by said active system, A redundant system switching method, wherein the standby system can access the shared memory when switching to the active system. 4. The redundant system switching method according to claim 3, wherein the shared memory stores a current setting information in the network, a current setting state storage unit, stores a previous setting information in the network, and a pre-setting state storage unit. A dual system switching method, comprising: a difference information storage unit that stores a difference between current network information and immediately preceding network information. 5. A duplex multi-protocol switch including an active system for performing network communication and a standby system for switching over when the active system fails and continuing the network communication, wherein the active system starts its own system and performs network communication. A first step of setting and operating the in-network information, a second step of communicating the in-network information to another system, and a third step of changing the in-network information immediately when the in-network information is changed. And a fourth step of immediately communicating the in-network information changed by the third step to another system,
A fifth step of requesting the other system to switch when a failure occurs in the own system, wherein the standby system activates the self system at the same time as the activation of the active system; and A seventh step of setting the in-network information in the own system by using the in-network information, and an eighth step of resetting the in-network information of the own system with the changed in-network information that the working system has communicated with. A ninth step of detecting the occurrence of a failure in the active system and starting the operation of network communication. 6. The dual-system switching program recording medium according to claim 5, wherein when the standby system is communicating with the standby system when a failure occurs in the active system, the communication content of the standby network is changed to the previous network. In the case of the inside information, the non-recording setting information after the occurrence of the failure is fetched from the held current setting state information,
When the communication content is the difference information between the current setting state and the previous setting state, the non-recording setting information after the occurrence of the failure is fetched from the held difference information, the own system is enabled by the fetched information, and the network communication is operated. A program recording medium of a duplex system switching method characterized by the above-mentioned.