JPH022261A - Duplicate system - Google Patents

Abstract

PURPOSE:To switch the line to a standby line automatically in the unit of line by defining the lines duplicately as active/standby state in the unit of channels and using the standby channel as the active channel if the active channel is faulty when communication is implemented through the active channel. CONSTITUTION:For example, in the case of raising the system, when the line definition is implemented, a network service processor(NSP) is used from a monitor node SV and the communication definition data is generated. During the operation, the monitor node SV applies polling to nodes MX(A), MX(B),MX (H),... to check the state of each channel. When a fault takes place in the active channel CH#a, the node MX(B) uses the standby flag of the communication definition data, of the channel CH#b as the active flag and the communication is implemented between the channels CH#h and CH#b. On the other hand, the faulty active channel CH#a is closed and acts like the standby channel.

Description

[Detailed Description of the Invention] (Table of Contents) Overview Industrial Field of Application Prior Art (Figure 6) Means for Solving Problems to be Solved by the Invention (Figure 1) Working Examples (Figure 2) ~Figure 5) Effects of the invention [Summary] This relates to a line duplexing method in a local area network, in particular, it is possible to define duplexing lines for each channel as working/preparatory lines, and when a failure occurs, the channel (n position) The purpose is to enable switching processing, monitoring nodes, and multiple)
- A communication definition input means that defines redundancy for each channel in a local area network that connects nodes via transmission paths, collects the channel status of each node, and notifies all nodes of the channel status of each node. A monitoring node is installed to control the communication destination according to the status of the working channel or the reserve channel, and a node is installed to control the communication destination according to the status of the working channel or the reserve channel.If a failure occurs in the working channel while communicating with the working channel, communication is performed using the protection channel as the working channel. This is what I decided to do.

[Industrial application field]

The present invention is based on L A N (Local Area Net).
Regarding the redundancy system for (work), it is especially important to define two lines, one for working and one for reserve, and to automatically and quickly switch to the r-node line in the event of a failure in the working line to maintain the line. Concerning what has been done.

[Prior Art] The l-7AN is installed in offices, factories, etc. as a carrier of office automation, factory automation, etc., and accommodates many important lines. If these important lines are disconnected (usually due to a gutter failure), it will cause a major disruption to business operations. Therefore, these important lines are required to be highly reliable and must be quickly restored in the event of a failure.

By the way, in order to improve the reliability of such lines,
Conventionally, as shown in FIG. 6 as a representative node number, l'+: The node accommodating the required line is duplicated by an optical coupler PCP, nodes a and b, and an optical switch PSW, and the working line is When the system went down, the operator manually switched the optical switch PSW and continued operation using the r-node line. For example, as shown in FIG. 6, node a is currently used, and data terminal D"FE is connected to switch SW.
5. When connected to node a side and used. When a line disconnection occurs at node d, the photo switch PSW and switch switch are switched to the node b side for use.

[Problem to be solved by the invention]

However, the above method requires an optical switch and a spare node, resulting in high cost. Moreover, since the line switching level is also determined on a node-by-node basis, if a node is provided with a plurality of channels, other lines other than the faulty line will be affected at the time of switching. Furthermore, it takes a considerable amount of time after a failure occurs until the operator discovers the failure and switches the optical switch.

Therefore, it is an object of the present invention to provide a redundancy system that does not require redundancy at the top of the line, but also automatically switches to a backup line in the event of a failure, thereby increasing reliability. It is.

[Means to solve the problem]

In order to achieve the above object, in the present invention, FIG. 1(a)
As shown in, for example, the channel CH of node MX (A)
#a is currently used, channel CH of node MX (B)
A duplex channel is defined such that #b is used as a backup. In this case, the data terminal DTE (A) connected to channel Ctf #a and the data terminal 1 connected to channel CF (#b) i' E (+3) are physically adjacent, or the data terminal is in such a state that it can be connected to either channel CHN3 or Ctl #b using a changeover switch.

Then, such duplication information is entered in the communication definition data.

For example, when setting up a system, when line definitions (line speed, opposite channel address, etc.) are made, the monitoring node S
:Create communication definition data using J processor (Nl'). As shown in Figure 1(b), this communication definition data includes a setting data part for setting the line set such as line speed and R1 CONC mode, the communication partner channel address, the other address of the duplex channel, and the current address. It consists of a working/preliminary 6iii flag that distinguishes between a channel and a protection channel. Note that the position of the time slot to be used is also entered in the setting data section.

Additionally, the monitoring node SV monitors the status of each channel by polling each node during system operation. As shown in Figure 1(c), the status of each channel is not only notified to all nodes as channel status data, but also
It is held as a status table in the monitoring node S■.

Now, the host processor II OS
Data terminal DTU (A) connected to I#a
When channel CH#b is used as a protection line when transmitting data to Create communication definition data.

At this time, in the communication definition data for channel #h, channel #a is entered as the partner CH address and channel #b is entered as the duplex C11 address, but the flag portion is set to all zeros, for example, and neither the working flag nor the reserve flag is entered. In the communication definition data of channel #a, channel #h is entered as the partner CH address, channel #b is entered as the duplex Cfl address, and the current flag is entered in the flag section. Further, in the communication definition data for channel #b, channel #h is entered as the partner CIT address, channel #21 is entered as the duplex C11 address, and a reserve flag is entered in the flag section. Of course, the exact same setting data is entered into the duplicated working channel and the reserved (+iii) channel.Then, each of these communication definition data is stored in each / from the monitoring notebook'SV.
FMX (II), MX (A), MX (I
3).

[Effect]

Based on these communication definition data, the working channel Cff #a, which is the other side of the converted channel, sets up a line with the communication partner channel CII #h when the system is started up, and starts communication.

During operation, the monitoring node S
It performs voice IJ7 on X (B) and MX (II)-, checks the status of each channel, and reports this to each node.

If a failure occurs in the current channel CH#a, node MX (B) sets the reserve flag of the communication definition data of channel CIt#b to the current flag, and this time channel CH#h starts communication with channel CH#b. Every time you do it. On the other hand, the faulty working channel CH#a is blocked and at the same time its flag portion is set as a backup flag and it thereafter operates as a backup channel.

Of course, the other channel of the duplex channel, that is, channel C
II #h monitors the status of the working channel and protection channel, and if any is in a communicable status, it is set to a communicative status.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 2 to 5.

Fig. 2 is a configuration diagram of an embodiment of the present invention, Fig. 3 is an explanatory diagram of communication definition data in each channel, Fig. 4 is an explanatory diagram of channel status data in each node, and Fig. 5 is an explanatory diagram of operating status. It is.

The monitoring node S includes, for example, a definition data creation unit 1 that creates communication definition data based on input from the network service processor NSP, and each node FMX (A) and MX.
(B) , MX (f-1) -4,: Status data creation unit 2 that creates channel status data based on data obtained by polling for each /-)'MX
(A) , MX (B), MX (11) = -1 Polling processing unit 3 that performs polling processing, Definition data table 4 that holds created communication definition data, Holds created channel status data A state data table 5 for controlling the monitoring node SV, a control unit 6 for comprehensively controlling the monitoring node SV, and the like are provided.

Each node also has a status check unit 1 for checking the channel status, as typically shown in node MX()f).
1. A destination holding unit 12 that holds communication definition data indicating which channel each channel in the node communicates with, etc., a control unit 13 that comprehensively controls the node, etc. are provided. Note that although each node is illustrated as having only one channel, it is of course provided with a plurality of channels. Each node is therefore equipped with a multiplexer.

Next, the operation of the present invention will be explained.

(1) Now, when host processor HO3'F and data terminal DTE (A) in FIG. 2 transmit and receive data,
Since the data terminal DTE (B) is nearby, communication is performed with channel CH#h using channel CH#a as active and channel CH#b as backup. Therefore, first, at the monitoring node S, the input from the network service processor NSP is performed as shown in FIG. 3(b).
Communication definition data for channel CH#a of node MX (A) shown in is created and sent to node MX (A).

As a result, channel CH#a of node MX (A) becomes communicable after setting data is set in a line set (not shown).

Similarly, the monitoring node S■ has the communication definition data of the channel CH#b of the node MX(B) and the communication definition of the channel CH#h of the node MX()-1) shown in FIG. 3(C) and (a). Create data and send them to NoFMX(B) and MX(+()).

As a result, each of these channels CH#b and CH#h is also set to 1.
．． Similarly, after data is set in a line set (not shown), the channel state is set to a communicable state.

(2) By the way, the monitoring node S■ quantitatively collects the channel status of each node in node order by polling and notifies all the nodes. Therefore, the polling processing unit 3 of the monitoring node S2 polls the node MX(A) and collects the channel status of each channel #00 and #a- of the node MX(A). There are three states in this channel: ■ A state in which communication is possible (shown as "f communication possible" in Figure 5), ■ A state in which communication is in progress, and ■ A blocked state in which it is blocked due to a failure. There are one of them shown for each channel. And the monitoring node S■ is shown in Figure 4 (
After sucking this channel state pig as shown in a),
Notify all nodes. When node MX (B) receives the channel state data of this node MX (A), it learns that the state of channel CI #a, which is the duplexing partner, is [communication possible, Channel CH#b remains "communicable". Also node MX
When (H) receives the channel state data of this node MX(Δ), it learns that the state of channel CH#a of node MX(A,), which is the communication partner, is "communication possible".

At this time, since the state of the own channel CH#h is also [Communication enabled 1], the channel CH#h is set to the [Communicating j state] and data transmission/reception with the host processor HOST is started.

Next, when the monitoring node Sv picks up the status of each channel of the channel MX (B), the status of each of these channels is distributed to all nodes as shown in FIG. 4(b). In this case, the node MX ( When A) receives this, channel C1111a of node MX (A) is currently in use and node M
Since the channel CH#b of X(B) is a reserve and the working channel CH#a is "communicable", the status of this channel CH#b is ignored. But node MX
When (11) receives this, it retrieves the state of channel CH#b and stores that it is in the "communication possible" state.

The state of each channel of node MX (H), that is, the channel status, is similarly transferred to monitoring node S.
After that, it is distributed to all swords as shown in Figure 4(C). Then, when node MX(A) receives this, channel C, which is the communication partner of that channel C11#a,
I(# Looks at the state of h and recognizes that f is communicating 1, and sets the state of channel CHN3 to [communicating 1] and starts transmitting and receiving data with data terminal DTE (A). As a result, data terminal DTE ( A) and host processor I
Communication with IOS T becomes possible.

Monitoring node S is polling the channel status of each node even during operation, so the status of each channel is constantly updated. However, when all channels are normal, channel CHN3 of node MX (A) is The channel CH#b of the middle J node MX (B) settles down to "communication possible" and the channel CII #h of the node MX (H) settles to "communicating".

(3) If the channel CH#a becomes a failure and its status becomes "blocked", the monitoring node S2 picks up this status by polling and notifies each node. This causes node MX (B) to connect to this channel CH#.
When it is detected from the channel state data that channel a has become "blocked", that channel CH#b is set to be in current use.

At this time, although channel CH#a is blocked in node MX (II), channel CH#a is used as a duplex channel.
Since #b is available, change channel CII #h to “
Communication possible.” Then, the monitoring node S■ is the node MX (
13) When the state of each channel is retrieved and notified to each node, node MX(H) sees that channel CH#b is "communicatable" and sets channel CH#h to "communicating". Also, node MX (B) sees that channel CH # h is "in communication" based on the channel state data of node MX (H) from monitoring node S, and sets this channel CI # b to 1-i! 11 Shinchu J. In the end, channel CI #a of node MX (A) is "blocked", channel CH # b of node MX (B) is "communicating", and channel CI # h of node MX (H) is "communicating".
Thus, communication between these channels C((#b and CH#h) is performed.

At this time, the channel CH#a is a protection channel. Therefore, even if the failure of this channel C■#a is recovered and communication becomes possible, the channel C
# As long as b is [Communicating J], the own channel will not become [Communicating].

From then on, /-tMX (B) (7) Channel cII#b
Even if a failure occurs, channel CH#a of node MX(Δ) becomes active and line switching is performed in the same process as described above.

Of course, the monitoring node SV is configured to hold the setting status of each channel and the status retrieved by polling, and to be able to display these on, for example, the network service processor NSP.

In addition, in the explanation described in 0i■, an example was explained in which the data terminals DTE (A) and DTE (B) were connected to channels of different nodes, but even if they are connected to different channels of the same node, It can be implemented in the same way. It is also possible to configure the data terminal DTE (Δ) so that it can be connected to different channels using a changeover switch, so that when a failure occurs in the current channel, it can be configured to automatically or manually switch to another channel.

〔Effect of the invention〕

According to the present invention, since duplexing can be performed on a channel-by-channel basis, the influence of switching can be much smaller compared to duplexing on a node-by-node basis. Furthermore, lines can be duplexed at low cost without having to unify Nord or install an optical changeover switch, which is required for node switching.Also, line switching is performed automatically and quickly, resulting in highly reliable lines. can be realized.

FIG. 5 is an explanatory diagram of the operation of the present invention, FIG. 6 shows a conventional example.

SV-1 monitoring node

Claims (1)

[Claims] (1) In a local area network that connects a monitoring node and multiple nodes via a transmission path, a communication definition input means (NSP) that performs redundancy definition for each channel; A monitoring node (SV) that notifies all nodes of the node channel status
) and a node (MX) that controls the communication destination according to the status of the working channel or protection channel, and when a failure occurs in the working channel while communicating with the working channel, the protection channel is used as the working channel and communication is continued. A duplex method characterized by the following: