JP2949544B2 - Communication control method for gateway device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control method for a gateway device that relays communication lines from a plurality of host devices and communication lines from a large number of terminals.

[0002]

FIG. 12 is a diagram showing a mapping example 1 of a communication line relayed by a conventional gateway device. In FIG. 12, a gateway device 1000 includes a terminal connected to a communication line from an A-system host device 2000. Machine (A) 4000
And (B) a terminal (C) that relays a communication line from 5000 and a communication line from the B-system host device 3000.
An example is shown in which communication lines from 6000 and (D) 7000 are relayed.

First, a logical path (route) between the host device 2000 or 3000 and the gateway device 1000 will be described. In general, a logical path refers to a pair of a self address and a partner address in a certain layer on a protocol. The logical path between the host device 2000 or 3000 and the gateway device 1000 is composed of the following three types of logical paths. (1) Single system logical path (indicated by LHS or L'HS in FIG. 12) (2) Plurality of inquiry logical paths (LHI1 to LHI1 in FIG. 12)
LHI or L'HI1 to L'HIM) (3) A plurality of logical paths for exchange flows (LHE1 in FIG. 12)
~ LHEN, or L'HE1 ~ L'HEM)

The system logical path transmits and receives data for controlling a network system. An example of the data of this system logical path will be described later in Table 1. In the inquiry logical path, inquiry communication from each terminal is performed. For example, in the case of financial business, the terminal of each branch notifies the account number of the customer and uses it for communication such as inquiring the account balance of the account number. In the exchange flow logical path, one-way communication from the host device to each terminal is performed. For example, in the case of financial business, it is used for communication such as sending remittance data to a partner branch. The value of N or M indicating the plurality is
For example, a number of about 64 or 128 is used.

In FIG. 12, the setting of a logical path between the A-system host device 2000 and the gateway device 1000 means that
Pair information (2100, 1100), (2101, 1101) between the addresses 2100 to 220N of a certain hierarchy on the system of the host system 2000 and the corresponding addresses 1100 to 120N of the gateway 1000.
.. (220N, 120N), and these address pair information are set in an initial state in which a communication line between both devices is provided. Similarly, the B-system host device 3000
The logical path between the gateway device 1000 and the gateway device 1000 includes address pair information (3100, 1300), (3101, 13
01),... (320M, 140M).

In FIG. 12, a logical path between each of the terminals 4000 to 7000 and the gateway device 1000 is constituted by the following three types of logical paths. (1) A single system logical path (LTAS, L in FIG. 12)
(Indicated by TBS, LTCS and LTDS) (2) Single query logical path (LTAI,
(Indicated by LTBI, LTCI and LTDI) (3) Single logical path for exchange flow (LTA in FIG. 12)
E, LTBE, LTCE and LTDE) Terminals 4000 to 7000 and gateway device 100
In the initial state of providing a communication line between the two devices, the logical path between the address pair information (15) and
00, 4001) ... (1603, 7001), (150
1,4002) ... (1604,7002) and (1
502, 4003)... (1605, 7003).

[0007] Next, 3 is input from the A-system and B-system host devices 2000 and 3000 to the gateway device 1000.
The following describes how the types of logical paths and the three types of logical paths input from each of the terminals 4000 to 7000 to the gateway device are mapped in the gateway device 1000. Here, the mapping is to associate the address of the host-side logical path with the address of the terminal-side logical path, and the plurality of address pair information is referred to as mapping information. By performing this mapping, the line between the host device and the terminal is connected, and communication is possible.

A-system or B-system host device 2000 or 30
The system logical path LHS or L'HS from 00 can be connected to the system logical paths LTAS, TLBS, LTCS and LTDS from any of the terminals 4000 to 7000, and can communicate with any terminal.
That is, any terminal 4000 to 7 can be used from the A-system host device 2000 or the B-system host device 3000.
000 and data can be transmitted and received. In FIG. 12, a logical path LHI for an inquiry from the A-system host device is shown.
1 address 1101 and logical path LHE for exchange flow
1 address 1201 is the terminal (A) 400
Address 150 of inquiry logical path LTAI from 0
1 and the address 150 of the exchange flow logical path LTAE
2 (corresponding to each other).
The logical path LH for inquiry from the A-system host device side
I2 address 1102 and exchange flow logical path LH
The address 1202 of E2 is the terminal (B) 50
Address 15 of inquiry logical path LTBI from 00
04 and the address 15 of the exchange flow logical path LTBE
05 is mapped. As a result, the terminal (A) 40
00 and (B) 5000 can communicate with the A-system host apparatus 2000 via the gateway apparatus 1000.

Similarly, the address 1301 of the inquiry logical path L'HI1 and the address 1401 of the exchange flow logical path L'HE1 from the B-system host device are respectively the inquiry logical path from the terminal (C) 6000. LT
CI address 1601 and logical path LT for exchange flow
This is mapped to the address 1602 of the CE. Also, B
1302 of the logical path L'HI2 for inquiry from the system host device side and the logical path L'HE2 for the exchange flow
Address 1402 is the terminal (D) 7000
1604 of logical path LTDI for inquiry from
And address 1605 of logical path LTDE for exchange flow
Is mapped. As a result, the terminal (C) 6000
And (D) 7000 can communicate with the B-system host device 3000 via the gateway device 1000.

In the prior art, the gateway device 1
000 fixedly holds the mapping information described in FIG. 12 as the mapping information when both the A-system host device 2000 and the B-system host device 3000 are normal. Therefore, for example, when a failure occurs in the B-system host device 3000, the B-system host device 300
The terminal (C) 6000 and the terminal (D) 7000, which had been communicating with the A.0, also had fixed mapping switching information so that they could communicate with the A-system host device 2000. FIG. 13 is a diagram showing a mapping example 2 of a communication line relayed by a conventional gateway device. FIG. 13 shows a terminal that has been communicating with the B-system host device 3000 because a failure has occurred in the B-system host device. Machine (C)
Inquiry logical paths (LTCI, LTDI) from addresses 6000 and (D) 7000 1601 and 160
4 and the logical path for exchange flow (LTCE, LTD
E) shows a state in which addresses 1602 and 1605 are mapped to corresponding addresses 1103 and 1104 and 1203 and 1204 from the A-system host device 2000, respectively. As a result, all the terminals (A) 4000 to (D) 7000 are connected to the A-system host device 2.
000.

Similarly, when a failure occurs in the A-system host device 2000, the terminals (A) 4000 and (B) 5 which have been communicating with the A-system host device 2000 until then.
000 also has fixed mapping switching information so that it can communicate with the B-system host device 3000.

[0012]

However, in the communication control method of the gateway device as described above, each gateway device has a plurality of host devices, in addition to the mapping information at the time of normal operation, and a certain host device system. In the event of a failure, all the mapping information for switching the failed system to the normal system must be held in its own device. Therefore, as the number of host systems increases, the amount of mapping information held increases, and In order to increase the number of devices, it is necessary to add or change the mapping information, which is not satisfactory for network maintenance. Further, when a certain host system fails, a switching operation of the communication information path is required for each terminal of the system, so that there is a problem that quick switching cannot be performed.

The present invention has been made in order to solve such a problem. In addition to the mapping information when all of the host systems of a plurality of systems are normal, when the gateway device fails in a certain host system, It is an object of the present invention to provide a communication control method of a gateway device which does not need to hold all mapping information for switching a faulty system to a normal system in its own device and can perform required system switching quickly.

[0014]

According to a communication control method of a gateway device according to the present invention, a communication line from a host system of a plurality of systems and a communication line from a large number of terminals are respectively connected to a gateway device. In the communication control method for a gateway device, which performs input-based connection and switching control of two communication lines to which the gateway device is input according to an instruction from any one of the plurality of host devices, A host-side logical path table generating step of generating a host-side logical path table for respectively defining an address pair of both apparatuses and a logical path of a corresponding terminal, for an inquiry and exchange flow logical path between the gateway device and the gateway device; Regarding the logical path for inquiry and exchange flow between each terminal and the gateway device, A terminal-side logical path table generating step of generating a terminal-side logical path table that respectively defines a logical pair of a host pair and a corresponding host device, and comparing the host-side logical path table with the terminal-side logical path table, The gateway device includes a mapping process for associating both the host and terminal addresses for each logical path with each other.

According to a second aspect of the present invention, there is provided a communication control method for a gateway device, wherein the load distribution between the host devices is changed when an imbalance occurs in the load distribution among the plurality of host devices. When a failure or recovery of any one of a plurality of host device systems occurs, the system is switched from the failed system to the normal system or the system is switched back from the normal system to the recovery system. The host device of any one of the systems performs the gateway device, and in accordance with the instruction for changing the line connection, for the inquiry and exchange flow logical path between the host device and the gateway device, the address pair of both devices and the corresponding terminal A host-side logical path table updating step of redefining the logical paths of the devices and updating the host-side logical path table, Mapping update processing for comparing the updated logical path table on the host side with the logical path table on the terminal side and updating the correspondence between both the host side and the terminal side for each logical path. And the steps are added to the gateway device according to claim 1.

[0016]

According to the first aspect of the present invention, a communication line from a plurality of host devices and a communication line from a large number of terminals are respectively input to a gateway device, and any one of the plurality of host devices is connected to the gateway device. In the communication control method of the gateway device, which performs connection control and switching control for each of the two communication lines to which the gateway device is input in accordance with an instruction from the gateway device, a host-side logical path table generating step in the gateway device, a terminal-side logic A path generation step and a mapping processing step are included. In the host-side logical path table generation step, for the inquiry and exchange flow logical paths between each of the host devices and the gateway device, the host-side logical path defining the address pair of the two devices and the logical path of the corresponding terminal respectively. Generate a path table. In the terminal-side logical path table generation step, a terminal-side logical path table that defines an address pair of both devices and a logical path of a corresponding host device, respectively, for an inquiry and exchange flow logical path between each terminal and the gateway device. Generate In the mapping processing step, the host-side logical path table and the terminal-side logical path table are collated, and both the host-side and terminal-side addresses are associated with each other for each logical path.

According to the second aspect of the present invention, a host side logical path table updating step and a mapping updating processing step are added to the gateway apparatus according to the first aspect of the present invention. When the load distribution among the plurality of host devices becomes unbalanced, the load distribution between the host devices is changed, or when the failure or restoration of any one of the plurality of host device systems occurs, the failure occurs. In order to switch the system from the normal system to the normal system or to switch back the system from the normal system to the recovery system, the host device of any one of the systems issues an instruction to change the line connection in the gateway device to the gateway device, and In the host-side logical path table updating step, for the inquiry and exchange flow logical paths between the host device and the gateway device, the address pair of the two devices and the logical path of the corresponding terminal are re-defined, respectively. To update the host-side logical path table. In the mapping update processing step, the updated host-side logical path table and the terminal-side logical path table are compared with each other, and for each of the logical paths, both the host-side and terminal-side addresses correspond to each other. Update the name.

[0018]

FIG. 1 is a diagram for explaining a communication control method of a gateway device according to the present invention. The gateway device 1000 shown in FIG.
00, a terminal side logical path table generation step 1800 and a mapping processing step 1900 are included. 2000-70
00 are the same as those in FIG. A system logical path LHS or L'H from the A-system or B-system host device 2000 or 3000 to the gateway device 1000
S is a system logical path LTAS from any of the terminals 4000 to 7000 in the gateway apparatus 1000,
Mapping is possible for LTBS, LTCS and LTDS, and communication with any terminal is possible. Host device 2000 or 3000 and gateway device 1000
Table 1 below shows an example of data on a system logical path between them.

[0019]

[Table 1]

In the column of data direction in Table 1, H indicates an A-system host device 2000, H 'indicates a B-system host device 3000, and G indicates a gateway device. The “system switching command” in the data name column indicates that a failure has occurred in the A
The system host device 3000 instructs the gateway device 1000 to switch the system of each terminal that has been communicating with the A system host device 2000.

Also, system logical paths LTAS-L between the gateway device 1000 and each of the terminals 4000-7000.
Table 2 below shows an example of data on the TDS. Note that T in the column of data direction in Table 2 indicates a terminal.

[0022]

[Table 2]

Logical path LTA for inquiry from terminal side
In the gateway device 1000, I to LTDI are logical paths LHI1 to LHIN for inquiries from the host device side.
L'HI1 to L'HIM are mapped, inquiry communication (for example, inquiry of the account balance of the customer account number) is performed, and the exchange flow logical paths LTAE to LTDE from the terminal side are transmitted to the gateway device 1000. Within, the exchange path logical path LHE1 from the host device side
LHEN and L'HE1 to L'HEM, and exchange flow communication (for example, notification of remittance data addressed to the partner branch) is performed.

When performing the above communication, the gateway device 1000 (1) firstly, in the host side logical path table generation step 1700, the address pair of the logical path between the host device and the gateway device and the corresponding terminal A logical path table from the host side which defines the logical paths from the machine side and stores these as a table is generated,
(2) Terminal side logical path table generation step 1800
, An address pair of a logical path between each terminal and the gateway device and a corresponding logical path from the host device side are defined, and a terminal-side logical path table storing these as a table is generated. Next, in the mapping processing step 1900, the host-side logical path table and the terminal-side logical path table are compared, and for each logical path, both the host-side and terminal-side addresses are determined.
A mapping process for associating with each other is performed.

FIG. 2 is a diagram showing an example of a host-side logical path table according to the present invention, FIG. 3 is a diagram showing an example of a terminal-side logical path table according to the present invention, and FIG. 4 is an example of mapping information of a gateway device according to the present invention. FIG. Referring to FIGS. 2 to 4, a host side logical path table generation step 1700, a terminal side logical path table generation step 1800, and a mapping processing step 1900 in the gateway device 1000 of FIG. 1.
Will be described with reference to a specific processing sequence in the case of starting and closing a network system, recovering from a failure, and the like. As an example of the start and end of a station, in the case of a financial business, the network system operates on a weekday excluding holidays such as Sundays and public holidays (for example, 9:00 am).
The service is opened in time, and is closed when all ongoing transactions are completed at the business closing time (for example, 4:00 pm).

FIG. 5 is a diagram showing a first example of a station opening sequence of the network system according to the present invention, and FIG. 5 shows an example of a station opening sequence in which a host device is set up first and a terminal is set up later.
In the drawings after FIG. 5 and the following description, simply describing a host device means that either the A-system host device 2000 or the B-system host device 3000 may be used. In other words, any of the host devices can issue a logical path setting, an opening command, a closing command, and the like. This is so that when one host device or its communication line fails, the other host device can take over all of the above instructions.

In step S11 of FIG. 5, all logical paths including the system logical path, the inquiry logical path, and the exchange flow logical path are set between the host apparatus and the gateway apparatus 1000. In this case, the A-system host device 2
000 or the B-system host device 3000 has the address pair information (2) of the system logical paths LHS and L'HS.
100, 1100) and (3100, 1300), the H-side address and the G-side address for each host-side logical path name for the inquiry logical path and the exchange flow logical path shown in the example of the host-side logical path table in FIG. , For example, (2101, 11) of the logical path LHI1
01), LHE1 (2201, 1201), LHI2
By specifying (2101, 1102),... As parameters, all logical paths can be set.

In step S12, the gateway device 1
000 to the host device via the system logical path LHS, and in step S13, an opening command is transmitted from the host device to the gateway device 1000 via the LHS. Data that can generate the host-side logical path table of FIG. 2 is transmitted from the parameters of the station opening command. That is, in the data example of FIG. 2, mapping of the host side logical path LHE1 determined by the address pair (2101, 1101) to the logical path LTAI of the terminal (A) 4000 is instructed, and the address pair (2201, 1201) ) Is the logical path LHE1 of the terminal (A) 4000.
Mapping with TAE is instructed. In this way,
A mapping instruction is issued for all of the host-side inquiry and exchange flow logical paths and the logical paths of the corresponding terminals.

Therefore, in the internal host-side logical path table generation step 1700, the gateway apparatus 1000 stores in the table all the mapping instruction data of the station opening instruction received from the host apparatus, as shown in the example of FIG. A host-side logical path table can be generated. When the host-side logical path table is generated, in step S14, the gateway device 100
From 0, a start command response is returned to the host device.

In step S15 in FIG. 5, the gateway device 1000 and the terminal (X) (X is A,
B, C, or D). In this case, the gateway device 1000
Is the system logical path L of the terminal (A) 4000, for example.
The system logical path between the two devices is set by specifying the address pair information (1500, 4001) of the TAS. Similarly, the gateway device 1000 is connected to the terminal (B).
By specifying the address pair information (1503, 5001), (1600, 6001), and (1603, 7001) for 5000 to (D) 7000, the system logical paths LTBS and LTCS between the gateway apparatus 1000 and each terminal, respectively. And LTDS are set. When the system logical path on the terminal side is set, in step S16, the gateway apparatus 1000 transmits a start-up notification to each terminal via the system logical path LTXS.

After the start-up notification is transmitted, the gateway device 1000 sets an inquiry logical path and an exchange flow logical path between the gateway device 1000 and each terminal in step S17. In this case, the gateway apparatus 1000 sets the address of the G-side address and the T-side address for each terminal-side logical path name for the inquiry logical path and the exchange flow logical path shown in the example of the terminal-side logical path table in FIG. The setting is performed by instructing the pair information, the corresponding host name and its logical path information as parameters.

That is, in the example of FIG.
I address pair information (1501, 4002) and the corresponding (ie, to be mapped) logical path LH of the A-system host
I1 and the address pair information of the logical path LTAE (150
2, 4003) and the corresponding logical path LH of the A-system host
By specifying E1,..., Etc. as parameters, all inquiry logical paths and exchange flow logical paths can be set. Therefore, the gateway device 1000
In the internal terminal-side logical path table generation step 1800, as shown in the example of FIG. 3, all of the set terminal-side logical path address pair and the corresponding host name and logical path information are stored in a table. The terminal-side logical path table stored in the terminal can be generated.

In step S18, the gateway device 1
000, in the internal mapping processing step 1900, compares the host-side logical path table with the terminal-side logical path table, and associates both the host-side and terminal-side addresses for each logical path with each other. Is performed. In the information example of the mapping result, as shown in FIG. 4, the G-side address of the host-side logical path and the corresponding G-side address of the terminal-side logical path are mapped. In the example of FIG. 4, the logical path LH
The address 1101 of the I1 and the address 1501 of the logical path LTA1 are mapped, and the address 1201 of the logical path LHE1 and the address 1501 of the logical path LTAE are mapped.
2 is mapped. Then, the lines in the gateway device 1000 are connected based on the mapping information, and the data flow between the host device and each terminal becomes possible via the gateway device 1000.

FIG. 6 is a diagram showing a second example of the station opening sequence of the network system according to the present invention. FIG. 6 shows an example of the station opening operation in which the terminal is set up first and the host device is set up later.
For this reason, in FIG. 6, the system logical path setting process between the gateway device 1000 and the terminal (X) in step S15 in FIG. 5 is first performed as step S10. Step S1 except for the change of the sequence order
The processing contents of 1 to S14 and S16 to S18 are completely the same as those in FIG.

FIG. 7 is a diagram showing an example of a recovery sequence at the time of a network system failure according to the present invention. In step S6 of FIG. 7, failure detection information of a certain host system itself or a communication line between the host device and the gateway device is notified to the gateway device 1000. In step S7, the gateway device 1000 notifies each terminal (X) of the failure system of a failure on the host side via the system logical path LTXS. When the host-side fault is notified to each of the faulty terminals, the data flow between the faulty host device and the terminal is disabled in step S8. Thereafter, when the fault of the faulty host device or the line is recovered, the fault recovery is notified to the gate device 1000 in step S9.

In steps S11 to S14, the same processing as described with reference to FIG. 5 is performed. When the process in step S14 is completed, in step S17A, the gateway device 1
000 notifies each terminal that has not been able to communicate due to a failure, via the system logical path LTXS, about the recovery of the host. Then, in step S18, the data flow between the restored host device and each terminal becomes possible by the same mapping processing as described in FIG.

FIG. 8 is a diagram showing an example of a station closing sequence of the network system according to the present invention. Step S in FIG.
At 21, the gateway device 1000 is sent from the host device.
Is transmitted via the system logical path LHS. The gateway device 1000 determines in step S22
And transmits the received closing command to each system logical path LT.
It transmits to each terminal (X) via XS. Step S2
In step 3, the process waits for completion of in-process communication for all logical paths between the host device and each terminal. When the communication in process is completed, in step S24, the gateway device 100
0 disconnects the logical path for inquiry and the logical path for exchange flow between the gateway apparatus 1000 and each terminal.

In step S25, each terminal (X) transmits a response signal of a station closing command to the gateway 1000 via the system logical path LTXS. Upon receiving the response signals from all the terminals in step S26, the gateway device 1000 transmits a response signal of the station closing command to the host device via the systematic logical path LHS in step S27. In step S28, the host device disconnects all logical paths between the host device and the gateway device 1000, and ends the station closing processing.

Next, a sequence of system switching and failback of the host device will be described. In this system switching and failback, a failure occurs in one system host device or its line,
When the terminal switches the communication partner to another system host device, or when the failure is restored and the system is switched back to the host system before switching, the terminal is further concentrated on the host device of a certain system. When the load becomes excessively heavy, in order to distribute the load among the host devices in a balanced manner, for example, a part (for example, 64) of the terminals (for example, 64 terminals) that had previously communicated with the A-system host device This is performed when, for example, 16) are transferred to the B-system host device side. 9 is a diagram showing an example of a host-side system switching logical path table according to the present invention, FIG. 10 is a diagram showing an example of mapping switching information of the gateway device according to the present invention, and FIG. 11 is a system switching sequence of the host device according to the present invention. It is a figure showing an example.

FIG. 11 will be described with reference to FIG. 9 and FIG. In step S31 of FIG. 11, the B-system host device 300
When the failure detection information of “0” is notified to the gateway device 1000, the gateway device 1000 proceeds to step S32
Then, the system logical path transmits a host failure notification to the terminals (C) 6000 and (D) 7000 that have been communicating with the B-system host device up to that time via the LTCS and the LTDS. In step S33, the A-system host device 200
No. 0 transmits a system switching command from the B-system host device 3000 to the A-system host device 2000 to the gateway device 1000 via the system logical path LHS. From the parameters of the system switching command, the gateway device 100
In the host side logical path table generation step 1700 in 0, a host side system switching logical path table is generated as shown in FIG.

In the example of FIG. 9, the address pair information (2
103, 1103), the logical path LHI3 on the A-system host side is the logical path LTC of the terminal (C) 6000.
I and address pair information (2203, 120
The logical path LHE3 on the A-system host side determined in 3) is
It is associated with the logical path LTCE of the terminal (C) 6000. In this way, the logical paths of the terminals (C) 6000 and (D) 7000 of the failure system (B system in this example) are switched to the host device 2000 of the normal system (A system in this example).

When the gateway apparatus 1000 generates this new host-side system switching logical path table,
At the same time, the link between the previous logical path on the B-system host and the logical path on the terminal side is disconnected. That is, the host-side logical path table generation step 1700 updates the host-side logical path table in accordance with a line connection change instruction for system switching or load distribution change from any system host device. This includes an update process.

In step S34, the gateway device 10
00 compares the newly generated host-side system switching logical path table with the terminal-side logical path table and associates both the host-side and terminal-side addresses for each logical path with each other. , And performs a mapping switching process. FIG. 10 shows an example of this mapping switching information. For example, the address 1103 of the A-system host side logical path LHI3 and the address 160 of the terminal side logical path LTCI are shown.
1 is mapped and the A-system host side logical path LH
The address 1203 of E3 and the address 1602 of the terminal side logical path LTCE are mapped. Then, the lines in the gateway device 1000 are switched based on this mapping.

That is, the mapping processing step 1900 renews the updated host-side logical path table and terminal-side logical path table in accordance with a line connection change instruction for system switching or load distribution change from the host device. It includes a mapping update processing step of collating and updating the correspondence between the addresses of the respective logical paths.

When the mapping switching process is completed, in step S35, the gateway device 1000 transmits a host switching completion notification to each terminal that has performed system switching. Then, in step S36, the A-system host device 2
000 and each terminal.

In the above-described embodiment, the system of the host device is shown as two systems, that is, the system A and the system B. However, the present invention is not limited to this. , The same operation can be performed. For example, when three systems of host devices A, B, and C are provided, and the host device of system B is faulty,
Terminals that had previously communicated with the B-system host device can be divided into two groups, and each group can be switched to the A-system and C-system host devices. In addition, when the host device of a certain system in failure has recovered, the system can be switched back exactly in the same manner as in the case of the system switching.

[0047]

As described above, according to the present invention, the gateway device for relaying a communication line input from a plurality of host devices and a communication line input from a large number of terminals is provided by the gateway device. In accordance with an instruction from any one of the host devices, a host-side logical path table that defines a logical path of a terminal corresponding to the inquiry and exchange flow logical path between each host device and the gateway device, and each of the terminal devices A terminal-side logical path table that defines a logical path for inquiries and exchange flows between gateway apparatuses and a logical path of the corresponding host apparatus is generated, and the generated host-side logical path table and terminal-side logical path table are generated. Since the mapping process is performed by collation and the connection of each communication line in the gateway device is made, It is not necessary to retain mapping information Koyu each gateway device, versatile gateway device is obtained.

Further, according to the present invention, when an imbalance occurs in the load distribution between the plurality of host devices, the load distribution among the host devices is changed, or when the load distribution among the plurality of host device systems is changed. When a failure occurs or recovers,
In order to perform system switching from the failed system to the normal system or to switch back the system from the normal system to the recovery system, the host device of any one of the systems instructs the gateway device to change the line connection in the gateway device, Since the connection of the communication line in the gateway device is changed according to the line connection change instruction, the gateway device performs various mappings when the host device system is normal, when there is a failure, or when the load is unbalanced, as in the related art. Since there is no need to retain information, the configuration of the gateway device can be simplified, and system switching operation or system switching software on the terminal side is not required, so that the required system switching can be quickly performed.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a communication control method of a gateway device according to the present invention.

FIG. 2 is a diagram showing an example of a host-side logical path table according to the present invention.

FIG. 3 is a diagram showing an example of a terminal-side logical path table according to the present invention.

FIG. 4 is a diagram showing an example of mapping information of the gateway device according to the present invention.

FIG. 5 is a diagram showing a first example of a station opening sequence of the network system according to the present invention.

FIG. 6 is a diagram showing a second example of the station opening sequence of the network system according to the present invention.

FIG. 7 is a diagram showing an example of a recovery sequence at the time of a network system failure according to the present invention.

FIG. 8 is a diagram showing an example of a station closing sequence of the network system according to the present invention.

FIG. 9 is a diagram showing an example of a host-side system switching logical path table according to the present invention.

FIG. 10 is a diagram showing an example of mapping switching information of the gateway device according to the present invention.

FIG. 11 is a diagram showing an example of a system switching sequence of the host device according to the present invention.

FIG. 12 is a diagram showing a mapping example 1 of a communication line relayed by a conventional gateway device.

FIG. 13 is a diagram illustrating a mapping example 2 of a communication line relayed by a conventional gateway device.

[Explanation of symbols]

 1000 Gateway device 1700 Host side logical path table generation step 1800 Terminal side logical path table generation step 1900 Mapping processing step 2000 A system host device 3000 B system host device 4000 Terminal (A) 5000 Terminal (B) 6000 Terminal (C ) 7000 terminal (D)

Continuation of the front page (56) References JP-A-1-255342 (JP, A) JP-A-2-26159 (JP, A) JP-A-4-33036 (JP, A) JP-A-6-132999 (JP) JP-A-62-1854 (JP, A) JP-A-6-44150 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04L 12/66

Claims (2)

(57) [Claims] A communication line from a plurality of host devices and a communication line from a large number of terminals are respectively input to a gateway device, and the gateway device is operated in accordance with an instruction from any one of the plurality of host devices. In the communication control method of the gateway device for performing connection control and switching control for each system of the two communication lines to which the input is input, the address pair of the host device and the gateway device for the inquiry and exchange flow logical paths And a host-side logical path table generating step of generating a host-side logical path table that respectively defines a logical path of a corresponding terminal; and a logical path for inquiring and a switching flow between each terminal and the gateway device. Terminal-side logical paths that respectively define the address pairs and the corresponding logical paths of the host device A terminal-side logical path table generating step of generating a table, and collating the host-side logical path table with the terminal-side logical path table. A communication processing method for the gateway device, wherein the gateway device includes a mapping processing step of associating with the gateway device. 2. A method for changing a load distribution between the host devices when a load distribution among the plurality of host devices is unbalanced, or for generating or recovering from a failure in any one of the plurality of host device systems. Sometimes, in order to perform a system switchover from the failed system to the normal system or a system switchback from the normal system to the recovery system, the host device of any one of the systems issues an instruction to change the line connection in the gateway device to the gateway device. According to the change instruction of the line connection, for the inquiry and exchange flow logical path between the host device and the gateway device, the address pair of both devices and the logical path of the corresponding terminal are redefined to define the host side logical path. A host-side logical path table updating step of updating a table; the updated host-side logical path table; 2. The gateway device according to claim 1, further comprising: a mapping update processing step of comparing a table with a table and updating a correspondence between the host side and the terminal side for each logical path. A communication control method for a gateway device.