JP2002077165A - Multiplexing network communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve barrier resistance to a physical barrier by (n) multiplexing networks and to provide a band that is approximately (n) times larger than a single network. SOLUTION: A process control table 12 outside a device having the entire process information of the device connected to the network is provided at each device, a control table 13 for transmission and a transmission number control table 14 are provided at a transmission-side device 10, and a control table 23 for reception and a local memory 24 for reception are provided at a reception- side device 20. A transmission-side process 11 being present at the transmission- side device 10 acquires information from each table when transmitting messages, and constantly transmits the messages only to a specific network. A network reception process 21 being present at the reception-side device 20 receives the messages from all networks 30, acquires information from the table, verifies the reception of the same message, and distributes the messages to a reception- side process 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer device connected to a plurality of communication lines such as a local area network or a wide area network, while maintaining high reliability of message transmission and reception between the devices while maintaining high network load. The present invention relates to a multiplexed network communication device capable of leveling data and a recording medium storing a program for executing the device.

[0002]

2. Description of the Related Art As one of message transmission methods using a network, there is a method using TCP / IP. As is well known, this is a transmission method in which a message transmitted from a process having one business function is transmitted to a process having another business function using a retransmission algorithm or the like.

In the case of network multiplexing,
Special hardware is installed, the state of the network is managed, and when an abnormality is detected, the network is switched to another network and retransmitted.

[0004]

However, the above-described retransmission algorithm alone cannot cope with a physical network disconnection.

In the case where networks are physically multiplexed, a vacant network is not normally used, so that messages are transmitted and received by one network, the load is concentrated on one network, and the utilization efficiency is increased. In addition, transmission efficiency deteriorates. In other words, when attempting to send a message from a plurality of processes on a plurality of devices to the network at the same time, only one network is used, and if one process does not end transmission, the other processes will not process. It stays and makes the utilization efficiency of the entire computer system inferior.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described background, and it is possible to reliably transmit and receive a message even when a physical network has a hardware failure. On the other hand, an object of the present invention is to provide an inter-device communication device and a network load leveling device in a multiplexed network in which a group of transmission-side processes can use a plurality of networks to physically increase the bandwidth of the network.

[0007]

In order to achieve the above-mentioned object, an inter-device communication device in a multiplexed network according to the present invention includes a transmitting device in a state where a plurality of devices are connected to a multiplexed network. When transmitting a message from the above-mentioned transmitting process to a group of receiving processes on a plurality of other receiving devices, an external device management table storing positional information of the existence of the receiving process on the transmitting device; A network configuration management process for detecting position information of a process existing in a device on the network, and updating the external device process management table.

For each transmitting side process, a transmission management table storing information on the order of transmission is provided, and a transmission number management table storing information on a network to be transmitted among a plurality of networks is provided. When transmitting a message, the external process management table is used to determine whether the message transmission destination exists in the network. If the message transmission destination exists, the transmission order information stored in the transmission management table is added to the message. And
The information in the transmission management table is updated, and the message is transmitted on the network to be transmitted based on the information stored in the transmission number table. (Claim 1)

When a message addressed to itself is received by a network receiving process for receiving a message transmitted over a network, a local buffer for reception is provided on the receiving side device, Store the message in the local buffer for reception. Also, a reception management table storing received order information is provided, and based on transmission order information described in a message existing in the reception local buffer, information stored in the reception management table is compared. In the case of a message that has not been received before, the message is delivered to a receiving process existing in the receiving device, and in the case of a message that has already been received, the message is discarded. Communication device (Claim 2).

Using the above apparatus, a transmitting process on a transmitting apparatus existing on a multiplexed network includes:
In order to transmit a message to a group of receiving processes on a plurality of other receiving devices, a transmission number management table storing network information to be used among a plurality of networks is provided in the transmitting process, and a message is transmitted. Has one of the normal networks among the plurality of networks.
When the transmission fails, the next normal network is searched from the transmission number management table, and the transmission is performed again. When the transmission is normal, the transmission number management table is updated. A communication device for leveling a network load in a multiplexed network by using a network other than the selected network.

In a multiplexed network communication device in a multiplexed network according to the present invention suitable for using the above-mentioned device, an external device management table storing the positions of all processes on the network; A network configuration management unit that grasps the position of the destination process from the process information stored in the external process management table; a transmission management table that stores information for preventing duplication of the same message when transmitting a message; Using a network multiplexed using a transmission number management table that stores information for determining which network of the network is to transmit a message, the transmission management table and the transmission number management table, A message transmitting unit that correctly transmits messages to the partner device A reception management table for storing whether the received message has already been received, a reception local buffer for temporarily storing the received message, and a reception management table and the reception local buffer for storing a message transmitted to a network. A communication device comprising: a receiving unit that receives and distributes a message to a process in the device.

[0012] Here, the inter-device communication device of the multiplexed multi-network can operate according to the number of existing networks.

[0013]

FIG. 1 shows an embodiment of the above-mentioned system. Sending process 11, Receiving process 2
The two cooperate to use a quadruple network, perform highly reliable inter-device communication in response to a network failure, and explain how to efficiently receive messages with reduced network load. .

As shown in FIG. 1, the out-of-apparatus process management table 12 stores data indicating a correspondence between a process and an apparatus in which the process is located. When a message is transmitted from the transmitting process 11 mounted in the transmitting device 10 to the receiving process 22 of the receiving device 20, the transmitting process 11 determines the destination process from the external process management table 12 according to the external process management table 12. Is detected and the device on which it is mounted is detected.

If implemented, the sending process 11
Adds a value obtained by increasing the number of transmissions of the transmission management table 13 by 1 to the message to be transmitted, and simultaneously increases the number of transmissions in the transmission management table 13 by 1. The message is transmitted to the network 30 in order to deliver the message to the mounting device of the receiving process 22 detected from the process management table 12 outside the device.

The network configuration management process 25 mounted on the transmitting device 10 communicates at regular intervals with a network configuration management process 26 mounted on the receiving device 20, which is another device. The network configuration management processes implemented on each device are the network configuration management processes 15 and 16 implemented on other devices.
And the process information on the own device are transmitted to each other, and the latest process information of the other device is recorded on the process management table 12 outside the device. As described above, the information recorded in the out-of-apparatus process management table 12 always holds the latest information.

Next, in order to determine which of the plurality of networks (four in this embodiment) 30a to 30d to transmit, the transmission number management table 14 is referred to and the setting is turned on. Network 30a
And sends a message to the detected network 30a. At this time, when the transmission fails, the message is transmitted to the next network 30b in the on state. When the transmission succeeds, the network in the current on state is turned off.
f state, and sets the network 30c next to the transmitted network 30b to the on state.

The receiving apparatus 20 is set to be able to receive messages from all four networks 30a to 30d, and the network receiving process 21 receives the message transmitted as described above. The received message is temporarily stored in the reception local memory 24. The received message is compared with the number of times of transmission added on the transmitting side and the number of times of reception in the receiving management table 23, and if they match, it is determined that the message has not been received before. Is distributed, and the number of receptions in the reception management table 23 is increased by one to the next expected number of receptions. However, if they do not match, it is assumed that the message has already been received, the message is discarded, and the process ends.

Next, the function of the transmitting process 11 will be described. As shown in the flowchart of FIG. 2, the transmission-side process 11, when attempting to transmit a certain message to the outside of the device, stores the position of the reception-side device 20 where the process of the transmission destination exists in the external process management table. 12
, Data having the same process name is detected, and the device name where the process of the transmission destination exists is obtained (S101). Next, in order to prevent transmission of a duplicate message for a message to be transmitted, the number of transmissions is obtained from the transmission management table 13 and transmission number information is added to the message (S
102) Then, in order to obtain a network to be transmitted among the quadruple networks, the transmission number management table 14 is referred to, and the transmission setting (on state) is set from the flag column.
Is detected (S103).

A message is transmitted to the detected network (S104), and if there is an abnormality in the transmitted network, or if the transmission fails due to a collision of the messages, the transmission number management table 14 is referred to again. Then, a network next to the transmitted network is acquired (S106), and the message is transmitted again (S10).
3). If the message has been successfully transmitted, the network described next to the network for which the flag information of the transmission number management table 14 has been successfully transmitted is set for the next transmission, and the currently set network is released (of the network).
f state) (S105), and the number of transmissions corresponding to the receiving side device 20 in the transmission management table 13 is increased by 1 (S107). When the column of the flag indicated by the transmission number management table 14 is at the lowest position, it is used cyclically by returning to the top.

By performing the processing as described above, one transmission-side process 11 sequentially acquires a plurality of networks at the time of transmission, and transmits a message to only one network in one communication. Even when there are a plurality of transmission-side processes on a plurality of devices, the position of the transmission number management table existing in each transmission device changes randomly, so that The message is transmitted uniformly, and the load of the quadrupled network is leveled.

Next, the receiving process will be described. The network receiving process 21 always receives a message from the multiplexed network according to the flowchart shown in FIG. 3 (S201). At this time, check whether the received message is addressed to itself, from the message,
Fetch a message only if you confirm that you are yourself.

Next, the received message is stored in the receiving local memory 24 (S202), and the transmission count data added as described above is extracted from the received message. Then, the number of receptions stored in the data is compared with the number of transmissions (S203), and if the comparison results match (S203).
204), it is determined that the message has not been received before, and the message is distributed to the receiving process 22 by in-device process communication (S205).

If the comparison results do not match, the message is determined to be a previously received message, and the message is discarded (S206). Even if there are a plurality of receiving-side processes, the number of transmissions and the number of receptions are unique in the apparatus, so that it is possible to cope with them.

Finally, the number of receptions corresponding to the transmission side device 10 in the reception management table 23 is increased by 1 and set to the next expected number of receptions (S207).

As described above, the network reception process 21 existing in the reception-side device 20 checks the reception of the same message based on the number of transmissions of the transmission-side device 10 and the number of receptions of the reception-side device 20 as described above. By doing so, even if the transmitting process 11 of the transmitting device 10 transmits the same message to a plurality of networks, it is prevented that the duplicate message is delivered to the receiving process 22.

[0027]

As described above, in the inter-device communication device and the network load leveling device in the multiplexed network according to the present invention, the number of n-folded networks is n times the average of the network bandwidth in one case. Since it can be handled like a band network and can withstand physical hardware failure due to multiplexing, high-speed and highly reliable message communication between devices can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an embodiment of an inter-device communication device and a network load leveling device in a multiplexed network according to the present invention.

FIG. 2 is a flowchart showing a procedure of a transmitting process.

FIG. 3 is a flowchart illustrating a procedure of a network reception process.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 transmitting device 11 transmitting process 12 external device management table 13 transmission management table 14 transmission number management table 20 receiving device 21 network receiving process 22 receiving process 23 receiving management table 24 receiving local memory 25, 26 network Configuration Management Process 30 Network

Claims (4)

[Claims] 1. A message is transmitted from a transmitting process on one device to a receiving process group on another plurality of devices while a plurality of devices are connected on a multiplexed network. In a device communication device, a network configuration management process for exchanging data on which device all the processes on the network are present in at certain intervals with each other, and a device storing the location of a process serving as a message destination A multiplexed network communication device having an external process management table and a transmission management table for storing a device name and a communication count for preventing duplication due to transmission of the same message when transmitting a message. 2. A network reception process for receiving a message transmitted on a network in which a plurality of devices are multiplexed, a reception management table for managing whether the received message is already received, A receiving local buffer for temporary storage,
By receiving the transmitted message by the network receiving process, it is confirmed that the message transmitted on the network is a destination for itself, stored in a local buffer for reception, and stored in the reception management table. Check the past reception history, and if the message has not been received before, deliver the message to a predetermined group of receiving processes. If the message has already been received, discard the message. Inter-device communication device in a multiplexed network for receiving a message. 3. In a state where a plurality of devices are connected on a multiplexed network, a transmission process on one transmission device is transmitted to a reception process group on another plurality of reception devices. When a message is transmitted, a transmission number management table for storing network information (network number in the present embodiment) used for the previous transmission among a large number of networks is provided. Based on the network information described in the table, the available network information among the multiplexed networks is sequentially used. If the message transmission fails, another available network among the remaining networks is used. To update the transmission number management table, and send a message to the multiplexed network. A communication device based on network load leveling in a multiplexed network for leveling network load. 4. A means for ascertaining the locations of processes existing on a plurality of devices on a multiplexed network, a transmitting means for transmitting a message to another device, and a message from another device. A multiplexed network communication device comprising: a receiving unit that receives a received message and distributes a message to a process in the device; and a unit that uses a multiplexed network to level communication load on the network.