JPH0821949B2 - Automatic allocation method of logical path information - Google Patents

Description

Detailed Description [Table of Contents] Outline Industrial field of application Conventional technology Problems to be solved by the invention Means for solving problems (FIG. 1) Action Example (a) of one embodiment Description of configuration (Fig. 2) (b) Description of operation of one embodiment (Figs. 3, 4, 5)
Figure) Effect of the invention [Overview] This is an automatic allocation method that allocates the identification number of the logical path that is logically set for each node connected to the network to communicate, and the allocation unit allocates the contents of the definition record in the memory. It refers to a search for an undefined logical path, avoids the defined identification number of the definition record, and automatically assigns the identification number to the undefined logical path.

[Industrial applications]

The present invention relates to an automatic allocation method for automatically allocating logical path information for identifying a logical communication path (logical path) between nodes in a data communication network system.

With the recent development of data communication, the data communication network between computers is becoming larger and more complex.

In the data communication network system as shown in FIG. 6 (A), a plurality of centers 11 to 1n are connected to the communication network 10.
The centers 11 to 1n are physically connected to the other centers by the communication line network 10 to perform data communication. Therefore, each center 11
~ 1n is a communication control processing unit CCP for controlling communication
Is provided.

On the other hand, when the network is shown in a logical configuration, as shown in FIG. 6B, each of the centers 11 to 1n is regarded as a logical device called a node. For example, in a network including four nodes, The communication lines connecting the nodes are captured by logical transmission lines (hereinafter referred to as logical paths) P1 to P6.

Such a communication protocol between nodes is called a protocol. In such a protocol, the function layer structure of the protocol is used to uniformly perform communication between the same level of each communication function layer defined by the logical structure. For example, as shown in FIG. 6C, the function control levels are
Four communication function levels are set: a transport level, a data link level, and a physical level. Each of these function levels is shown in, for example, "First Edition Data Communication" issued by the Institute of Electronics and Communication Engineers (first edition issued on December 1, 1979), and the explanation is simplified, but the physical level is The control of a physical line is, for example, a line interface control, a switching connection procedure, or the like, and the data link level is a control of a logical path set on a physical line between adjacent devices, for example, a transmission control procedure. Further, the transport level is control of a logical path between devices at both ends connected via a plurality of lines, and there is routing control in addition to the logical path control. The function control level is
Information input / output control and information conversion, such as file transfer control.

Among these, at the transport level, control between transmitting and receiving nodes is performed, and control of logical paths is performed, that is, identification control of logical paths provided for a pair of processes that perform communication is performed. is there.

[Conventional technology]

In such a logical path, an identification number (hereinafter referred to as TCN number) is attached to each node, and a TCN number is attached to the head of data transmitted and received in data communication. Which logical path has been used for transmission? Is made visible to transport level programs.

At that time, the method of using the same TCN number in the programs at both ends of the path is called TCN routing. Instead of always using the same TCN number, each program arbitrarily uses the TCN number. The method is called NAD routing. For example, in FIG. 7, the own TCN number assigned to the logical path and the other party TCN number assigned to the other party are set as the logical path information in the control information section of the data transfer unit, and the transfer is performed.

There are a VC (Vertial Call) method and a PVC (Permanent Vertual Circuit) method as the connection method of the logical path.
The VC method determines the TCN number by synchronizing the programs at both ends of the logical path when actually communicating data, uses it exclusively during communication, and releases it when communication is completed. Not used in programs.
On the other hand, in the PVC method, the designer fixedly sets the logical path at the stage of designing the network, so that the logical path is always secured by the program, and when communicating frequently, it is better than the VC method. However, there is no need to perform the processing of determining and releasing the TCN number, and there is no problem that the logical path cannot be set because the TCN is busy when it is occupied by others.

In this PVC method, as described above, the TCN number is fixedly set for the logical path, so at the time of network design, the designer defines all PVC logical paths in the network. A control statement in a card format defined by a person was input to create a management record of a logical path as one of control data.

[Problems to be solved by the invention]

However, the conventional TCN number setting for PVC paths is not easy because the number of logical paths increases as the network configuration grows in size and becomes more complicated. Even if a path is set, there are N (N-1) TCN numbers of the number of nodes N, that is, 2 of the number of nodes.
There is a problem in that when the multiple orders are required to be set and a plurality of logical paths are set between the nodes, the work becomes more difficult and the burden on the user (designer) increases.
Also, when incorporating a new system into an existing network,
Similarly, it is necessary to find a TCN number different from the previously assigned TCN number and perform setting work, which causes a problem that the work load further increases.

An object of the present invention is to provide an automatic allocation method of logical path information that can automatically allocate path information (TCN number) of a PVC path and reduce the burden on the user.

[Means for solving problems]

 FIG. 1 is an explanatory view of the principle of the present invention.

In the figure, reference numeral 1 is a logic unit for performing communication control, which is constituted by, for example, a mini computer, 2 is a memory, and stores control data of a communication control program related to various communication control programs. 1a is an automatic allocation unit, which is provided as a function of the logical unit 1 and automatically allocates the TCN number of the PVC path. 20 is a definition record, which is stored in the memory 2 and is stored in the network. The contents common to all the nodes, which stores the TCN numbers of the node pairs predefined by the user for all PVC paths in the network, 21 is a management record, which is provided in the memory 2, Each node has its own TCN number for the destination node BC ... M for which a logical path has been set for that node, and T used by the other node
It stores the CN number and. The automatic allocation unit 1a of the logical unit 1 looks at the definition record 20 of the memory 2 and
Undefined logical path (destination node) is searched and definition record
TCN for each undefined logical path avoiding 20 predefined TCN numbers
The numbers are sequentially assigned.

[Action]

According to the present invention, for a logical path that is desired to be fixedly used for a special purpose between the own node and the partner node, the user inputs the TCN number and the definition record 20 is stored in the memory 2
For other items, the automatic allocating unit 1a sequentially allocates TCN numbers to complete the management record 21.

For example, for the node A, the logical paths to the node B and the node C are TCN numbers “A-1” and “A-3” at the own node,
When the partner nodes B and C are defined as "B-2" and "C-1", the automatic allocation unit assigns "A-" to which the own node TCN number has already been allocated for the destination node D and below of the management record 21. The management record 21 is completed by adding "1" and "A-3" in ascending order from "A-2".

〔Example〕

 (A) Description of the configuration of one embodiment.

FIG. 2 is a block diagram of an embodiment of the present invention, and shows a block diagram of the communication control processing device CCP provided in each node.

In the figure, the same components as those shown in FIG. 1 are designated by the same symbols, and 3 is a line interface unit, which is a physical level (line interface control) and data link level (data link control) communication function. Is a hardware for executing, and a plurality of line adapters (hereinafter referred to as LA) 32 to 3n connected to a communication line, a line adapter common unit (hereinafter referred to as LAB) 31, and a line controller (hereinafter referred to as LC). A host interface unit, which is connected to the host by a data channel, which will be described later, and a peripheral device interface unit, which is an input / output device (input device) connected to the CCP. , A display device, etc.), and 6 is a host computer (hereinafter referred to as a host) that executes data processing.

The logical unit 1 is connected to the line interface unit 3, the host interface unit 4 and the peripheral device interface unit 5 and executes the communication function at the transport level and the function control level. Allocation processing is performed.

(B) Description of the operation of one embodiment.

FIG. 3 is a flow chart of the automatic allocation process in the configuration of FIG.

When the automatic allocation unit 1a of the logical unit 1 is activated,
The allocation unit 1a stores the (PVC path TCN) definition record in the memory 2.
See 20. If there is a defined logical path (pair of nodes) in the definition record 20, the uniqueness of the TCN number defined in this is checked. That is, check whether the defined TCN numbers (TCN number pairs) for all PVC paths in the network input by the user operating the peripheral device from the peripheral device interface unit 5 are duplicated in each node in the network. Find out.

If there is an overlap, an error message is output from the interface unit 5 to the peripheral device, the user is notified, and the error message is corrected.

On the other hand, if there is no overlap, the allocating unit 1a searches the definition record 20 for an undefined logical path (route). The definition record 20 stores all node pairs (PVC paths) in the network as shown in FIG. Therefore, it is checked whether all the PVC paths have been defined, and the undefined logical path is searched. If there are no undefined logical paths, the TCN numbers of all the logical paths have been defined, so the processing ends.

When it is determined that there is an undefined logical path (route), the undefined portion determination process is started.

The definition record 20 has TCN number columns for all logical paths (node pairs) in the network. Therefore, for undefined node pairs, avoid the TCN numbers of the defined node pairs and increase the order from "1". Assign a TCN number to.

That is, as shown in Fig. 1, there are node pairs from A / B to M / L,
If A / B and A / C are already defined, avoid this number and assign the TCN number of each node to the undefined node pair. For example,
In the example of FIG. 1, "A-1", "B" for the node pair A / B
-2 "," A-3 "," C- "for node pair A / C
Since "1" is assigned, a young number "A-2" excluding "A-1" and "A-3" is assigned to the node pair A / D.
And because the TCN number is not defined in node D,
"D-1" is attached.

Therefore, in each of the nodes A to M, the TCN numbers of the nodes forming the node pair are attached to all the logical paths (node pairs) forming the network, regardless of whether the own node is connected.

When all undefined parts have been allocated, each node A
The MCN definition records 20 store the TCN numbers of the logical paths set in the entire network. Therefore, the definition records 20 of the nodes A to M all have the same definition.

Further, the automatic allocation unit 1a extracts a logical path related to the self node from the defined TCN numbers of all logical paths of the definition record 20 and stores it in the management record 21. Therefore, in the management record 21 of FIG. 1 in the node A, from the definition record 20, the own TCN numbers of the logical paths A / B to A / M connected to the node A (TCN numbers viewed from the node A), The partner TCN number (that is, the TCN number viewed from the nodes B to M) is stored.

 FIG. 4 is an operation explanatory diagram of the processing.

In this example, four nodes 11 to 14 have six logical paths P1.
~ P6 is set, and the logical path P4 has nodes
It is assumed that TCN numbers "B-2" and "C-1" are defined between 12 and 13.

As shown in FIG. 4 (A), "1" for undefined
Since TCN numbers are assigned in ascending order, each node 11, 1
2, 13, and 14 respectively, the TCN number "A-1" for the logical path P1,
"B-1" is assigned.

Next, as shown in FIG. 4B, the TCN numbers "A-2" and "C-2" are assigned to the logical paths P2 at the nodes 11 to 14, respectively.

Also, as shown in FIG. 4 (C), for each logical path P3,
TCN numbers "A-3" and "D-1" are assigned.

Next, as shown in FIG. 4 (D), TCN numbers "B-3" and "D-2" are assigned to the logical path P5.

Further, as shown in FIG. 4 (E), TCN numbers "C-3" and "D-3" are assigned to the logical path P6, and the assignment to all logical paths P1 to P6 is completed. At this time, the TCN number pairs for all the logical paths P1 to P6 are stored in the definition record 20 of each node.

Then, each node 11 to 14 extracts the TCN number pair of the logical path related to its own node from the definition record 20 and completes the management record as shown in FIGS. 5 (A) to (D). still,
The circled numbers are pre-defined. That is, in the node A, the own node TCN numbers "A-1", "A-2", "A-3" for the nodes B, C, D and the partner TCN numbers "B-1", "C-" of each node BCD. 2 "," D
-1 "is extracted and stored.

In this example, for simplicity of explanation, one logical path is set for each of the four nodes, but in a large nationwide network, the number of nodes is several tens and the number of logical paths is on the order of several hundreds. The effect of automatic allocation is great.

By completing the management record in this way, the logical unit 1 obtains the TCN number of the corresponding logical path from the management record 21 in response to the program request, and as the logical path information, the control information of the data transfer format as shown in FIG. Set to the line and send to the line through the line interface unit 3 to transmit / receive with the partner node. Further, with respect to the data transfer from the partner node, the program can be made to recognize the logical path passed by referring to the management record 21.

Although the present invention has been described with reference to the embodiments, the present invention can be variously modified according to the gist of the present invention, and these modifications are not excluded from the present invention.

〔The invention's effect〕

As described above, according to the present invention, since the logical path information is automatically assigned, it is possible to save the user the trouble of defining the logical path information, and particularly the complexity and the scale are increased. The effect is remarkable for the network that operates. Further, when incorporating the new system into the existing network, it is possible to save the extremely complicated effort of checking the existing logical path information and newly setting the logical path information, and the effect is further enhanced. Further, since the logical path information desired to be defined in advance is allowed for the user, there is an effect that flexible definition is possible, and it is possible to provide a system that is easy for the user to use.

[Brief description of drawings]

FIG. 1 is an explanatory view of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is a processing flow chart of the embodiment of FIG. 2, and FIG. 4 is an operation explanation of the embodiment of FIG. FIG. 5, FIG. 5 is a completed view of the management record of the embodiment of FIG. 2, FIG. 6 is an explanatory view of the control of the data communication network, and FIG. 7 is an explanatory view of the data transfer format in FIG. In the figure, 1 ... Logical unit, 1a ... Automatic allocation section, 2 ... Memory, 10 ... Communication network, 11-1n ... Node (center), 20 ... Definition record, 21 ... Management record, P1 ~
P6 ... Logical path.

Continuation of the front page (56) References Digital Data Exchange Network Part 1 Exchange Edition Overview (Part 3) Packet Switching Central Telecommunications School (February 16, 1981) P. 76-77, P. 284-285

Claims (1)

[Claims] 1. A PVC system using a fixedly set logical path identification number between nodes because each node communicates in a data communication network in which a plurality of nodes are network-connected. A combination of all the nodes, a definition record that stores the defined identification number of the logical path defined in advance for the combination, and a management record that stores the identification number of the logical path required for each node to communicate. A memory having the same, and an allocation unit that refers to the definition record of the memory, searches for an undefined logical path, and automatically allocates the identification number of the management record, and the allocation unit assigns the undefined path to the undefined path. On the other hand, the identification number is sequentially assigned while avoiding the defined number of the definition record, and the logical path required from the definition record to each node is assigned to the management record. An automatic method of logical path information and storing a different number.