JPH02172343A - Logical path setting method for communication network - Google Patents

Abstract

PURPOSE:To provide plural logical paths on all other equipments independently by each node at the initial point of time by providing regularity to the assignment of a subchannel of a connection bus information. CONSTITUTION:A prescribed regularity is provided on the assignment of the subchannel to the opposite equipment of a connection path information memory 110 provided on each node 100. That is, as to all subchannel number of each node, the subchannel number assigned to another node is decided so that the number is equal to (node number subscribed to system)X(number of paths assigned to another node) and the assignment is applied for each path number in the descending order (ascending order) of node addresses. Thus, logical paths are formed in the initial stage without contradiction for each node subscribing the system.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a logical path setting method for a communication network,
Especially in communication network systems where multiple nodes (central processing unit, communication control processing unit, etc.) are connected to each other via communication lines, and each node accommodates multiple terminals (devices), the impact on other nodes The present invention relates to a logical path setting method suitable for all nodes participating in a system to independently set up a logical path between arbitrary nodes.

[Conventional technology]

A communication network system typically includes a central processing unit,
The configuration is such that a plurality of nodes are connected to each other via communication lines, with a communication control processing device or the like serving as a node, and each node accommodates a plurality of terminals (devices).

Conventionally, logical paths in this type of communication network system are established and disconnected before starting data transfer, as described in the Information Processing Society of Japan's journal "Information Processing" (Vol. 26, No. 4). A CR (Connection Request) command is sent to the other party, and a CC (Connection Confirm) response is received from the other party. At that point, it is assumed that the logical path has been established. Also, when the data transfer is completed, the DR (disconnection request)
The logical path was cut by sending a command to the other party.

[Problem to be solved by the invention]

In the above conventional technology, when communicating with the other party's device, each time a communication is performed, a logical path is established by a command, and when the communication is completed, the path is cut again by a command. There was a problem that it was time consuming. A possible solution to this problem is to set up a logical path at the initial stage, but in this case, set the subchannel address node ~res of the device pair, ε, in the connection path information memory. In addition, a means to manage information for the entire system is required.

An object of the present invention is to provide regularity to the allocation of subchannels in the connection path information memory, so that each node can independently establish multiple logical paths to all other devices at an initial point in time. The purpose of this invention is to provide a logical path setting method that allows for

[Means to solve the problem]

In order to achieve the above object, in the present invention, subchannels are assigned to the other device in the connection path information memory held by each node with a certain regularity (No. Or,
Alternatively, by assigning subchannels in a loop in ascending or descending order of device addresses, with the address of the own device as the center), it is possible to accurately determine where among the other subchannels there is a subchannel addressed to the own device. This is what I did.

[For production]

The number of subchannels to be allocated to another node so that the total number of subchannels for each node is equal to (number of nodes participating in the system) x (number of paths allocated to another node 1 ~) Determine. If you do this, there will be a surplus of subchannels equal to the number of paths for your own node, but
This may be used for the self-address, global address, etc. each time.

Now, if we consider only the subchannel for establishing a path to the other No. 1, the allocation is done by the number of paths in ascending order of the node address (in ascending order). 1< Allocate subchannels in order from the node with the smallest (largest) address, or first allocate the node with the next smallest (largest) address after its own node address, and then allocate in order of smallest (largest) A conceivable method is to allocate subchannels in a loop, by going to the minimum (maximum) address node, returning to the minimum (maximum) address node, and then assigning 5 in order.

If such a method is adopted, it can be known which subchannel of an arbitrary partner node 1 is used as a subchannel for establishing a logical path with the own node.

Therefore, values can be set to subchannels, that is, logical paths can be established smoothly.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a system to which the present invention is applied. In FIG. 1, 100 is No. 1~,
They are connected to each other through a communication line 200. No 1
'l The number in OO represents the node address. In this example, the number of nodes is 32, and the addresses are even numbers from 2 to 64. Note that the No. 1 to addresses do not need to be arranged regularly. Further, although a loop type is shown in FIG. 1, a path type may also be used. OO has multiple terminals (devices) 300
is accommodated. The numbers in the terminal 300 are the terminal address (
subchannel address), and in this example, the number of subchannels is 256.

Each node 1 to 100 holds a connection path information memory. FIG. 2 shows an example of the configuration of the connection path information memory. The connection path information memory 110 consists of a plurality of subchannels, and each subchannel corresponds one-to-one with each of a plurality of terminals (devices) connected to the node "-oO." DA in each subchannel indicates the destination node address, and LDA indicates the destination subchannel address.

Set the values of the node address DA and subchannel address LDA of the other node to which you want to establish a logical path in the subchannel in the connection path information memory 110 held by each node 100, and then set the subchannel of the node 100 that corresponds to the set value. The other party node address DA in
It can be considered that a logical path has been established only when DA indicates the own subchannel address.

For example, in FIG. 2, the value of the subchannel (subchannel address B1) in the connection path information memory 1-]-0 of a certain node (node address A1) is D A, = A 2 , T- D A = B
2, the value in the subchannel of the subchannel address node address B2 in the connection path information memory 1, 10 of the node with the node address A2 is DA=Al,L.
It can be assumed that the logical path has been established only when DA=B1.

Next, an embodiment of a method of allocating subchannels to a partner device of a connection path information memory according to the present invention will be described.

Here, the maximum number of nodes in the system is n, and the number of paths to other nodes (same number for all nodes) is t.
Make it into a book. Therefore, the total number of subchannels per node is nXt=nt. Also, the self-two address node Jerez is A (2, 4, 6, -, 2n-2,
2n) Let the own subchannel address be B (0,], 2., nt-2, nt-1). Note that among the total number of subchannels, there are extra subchannels addressed to the own node, but in this case, it is assumed that all nodes bring the extra subchannels to the beginning of all subchannels.

3 and 4 show examples in which values are actually set in the connection path information memory 110 using the method of the present invention. In this example, the number of nodes is 32 (node addresses 2, 4, . . . 64), the number of subchannels is 256 (subchannel addresses 0, 1° 2, . . . , 255), and the number of subchannels is 8. - group is represented by a subchannel address group of 0 to 31. Also, in both Figures 3 and 4, subchannel addresses 0 to 7 (O subchannel group)
will be used as a backup.

FIG. 3 is an example in which subchannels are assigned to all nodes in order of the smallest address of the other node. In Figure 3, (a, b
), a indicates a partner node address and b indicates a subchannel address group. For example, <12.3> is subchannel address group number 5 of the node with node address number 6 (
DA=12 for subchannel addresses 40 to 47)
．． This means that LDA-24 to LDA-31 are allocated.

In the case of FIG. 3, the values of the destination node address DA and the destination subchannel address are determined as follows.

How to find DA [B...Set as the number obtained by dividing I3 by t (ignoring the remainder).

2X[B] and own node address A are compared.

2X [If B≧A 111) A...2X [B] +2 2×[B〈If A DA・2X[T-(] How to find L, p-A- Compare A, /2 and [B].

If A/2> [B then C=A/2-1 If A/2≦[B] then C2 A/2 Set the value of C as shown in the following. D indicates the first subchannel address of the same partner No. 1~. For example, in Figure 3,
Shows subchannel addresses 8 and 16 in the ZAF channel address node to response group.

Furthermore, (B)...If the remainder when B is divided by t is LD
A.=t But,
In <a, b>, a indicates the destination node address and b indicates the subchannel address group.

For example, <12.29> is DA for subchannel address group number 3 (subchannel addresses 24 to 31) of the node with node address number 6]2. LDA=232~239
means to allocate.

In the case of FIG. 4, the values of the destination node address I) A and the destination subchannel address are determined as follows.

How to find DA [B]...If B is divided by the number (ignoring the remainder), then DA...A-1-2X [B However, if DA is greater than 29, 2n decrease. Also, [B,] is multiplied by 2 because the number of ``two-door'' 1 dresses increases by 2. If it increases by 4, it will be multiplied by 4.

-], -D-△-'s -* measurement DA value is set as C. In addition, if A, < C, then A +
2 Let n be the value of A.

(A, -C) Let t/2=D.

The reason why t is divided by 2 is that the node address increases by 2. If it increases by 4, it will be divided by 4.

Furthermore, if (B) - B is divided by t and the remainder is L i) A. Each node in the network can establish a logical path in the initial stage without any contradiction. When communicating, it is necessary to first create a logical path between the two communicating nodes.If you create a logical path between any nodes in the initial stage like this, each time you communicate, There is no need to establish and disconnect logical paths each time, which saves time and reduces communication time.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a configuration example of a communication network system to which the present invention is applied, FIG. 2 is a diagram showing a configuration example of a connection path information memory held by each node, and FIGS. 3 and 4 are diagrams showing a configuration example of a communication network system to which the present invention is applied. FIG. 3 is a diagram illustrating a specific example of the contents of a connection path information memory according to FIG. 100・To No. 1, ↓10・・Connection path information memory, 200・・Communication line, 300・Terminal (device), D, A・・Destination node address, LDA・・Destination subchannel address.

Claims (2)

[Claims] (1) Multiple nodes are connected to each other by communication lines,
Each node accommodates a plurality of devices, and each node holds a connection path information memory consisting of a plurality of subchannels in one-to-one correspondence with the accommodated devices,
Set the values of the node address and subchannel address of the partner node to which you want to establish a logical path in the subchannel in the connection path information memory, and set the partner node address in the subchannel of the node corresponding to the set value to In a communication network system that performs communication by assuming that a logical path has been established only when the node address and the subchannel address of the other party indicate its own subchannel address, each node stores information in the connection path information memory. Divide the number of subchannels you own by the total number of nodes joining the system,
Using that value as the number of subchannels to allocate to one partner node (the value is A), all nodes joining the system will subchannel their own subchannels in order from the smallest or largest node address, excluding the own node. A logical path setting method for a communication network, characterized in that channel addresses are allocated in units of A starting from the lowest number. (2) After determining the number of subchannels to be allocated to one partner node, when all nodes joining the system are arranged in order from the smallest (largest) node address, excluding the own node, the number of subchannels to be allocated to one partner node is To allocate A pieces of channel address to each other node in order from the smallest number to the other node, first allocate the node with the smallest node address (larger node) after the own node, and then ) and assign the other node to
When you reach the maximum address node (minimum address node), return to the minimum address node (maximum address node),
The logical path setting method for a communication network according to claim 1, characterized in that the destination nodes are allocated in descending order of node address (in descending order).