JPH02244847A - Inter-local area network connecting method - Google Patents

Abstract

PURPOSE:To perform supervisory control assuming the branch LAN of a group as one LAN by performing the specific control of a node to which the branch LAN of a skeleton local area network (skeleton LAN) is connected. CONSTITUTION:Data received from a transmission line in current use in the branch LAN 21 is handled in such a way that the transmission destination address of a packet to be transmitted is erased at a reception node by a group address and a transmission origin address is transmitted as the address of its own node 1. A node 3 of group address receiving the packet holds the transmission origin address in the packet, and transmits it to the transmission line in current use of a connection branch LAN 22. Also, the data received from the spare transmission line of the connection branch LAN 22 is transmitted in the packet setting a held transmission origin address as the transmission destination address, and the node 1 receiving the packet transmits it to the spare transmission line of the connection branch LAN 21. Also, when a system is switched where the transmission line in current use of the skeleton LAN 20 is switched to the spare transmission line, the function of the node 1 is performed oppositely to that of the node 3. Thereby, since the branch LAN of the group can be assumed as one LAN, the supervisory control can be performed with one supervisory unit.

Description

[Detailed Description of the Invention] [Summary] A loop-shaped backbone local area network (hereinafter referred to as LAN) with dual transmission lines in opposite directions in the tile and a plurality of one group. In the case where there are branch LANs and communication between the branch LANs is performed via the trunk LAN, the LAN indirection method is used.
1. It is possible to monitor and control N by considering it as one LAN. ,
, AN, and AN, the working and backup transmission lines of each branch line 1 and AN are connected to each node of the backbone LAN, and the nodes of the backbone LAN are connected to the working transmission lines of the branch LAN to be connected. The data received from
The destination address of the packet to be sent is the group address and the receiving node is erased, the source address is sent as the address of the own node, and the node with the group address that receives the packet retains the source atrus in the packet, The data sent to the active transmission line of the connecting branch line LAN and received from the backup transmission line of the connected branch line LAN is sent as a packet with the retained source address as the destination address 5, and the packet is received 1 ．． In addition, the node transmits to the backup transmission line of the connected branch LAN. Also, the core
At the time of system switching when the working transmission line of AN is switched to the protection transmission line, set the destination address on branch line 1, receiving from the working transmission line of AN and receiving from the protection transmission line, by reversing the above. In contrast, the configuration is such that the destination address of data from the protection transmission path is set as a group address, and the data is transmitted as a source Atnos holding the destination address of data from the working transmission path.

[Industrial Application Field] The present invention has a loop-shaped backbone LAN and a plurality of branch LANs in one group, each having dual transmission lines in opposite directions, and the communication between each branch LAN is carried out through the backbone LAN. The present invention relates to a method for connecting local area networks, in which the branch line LAN of a group can be regarded as one LAN and can be monitored and controlled.

As shown in Figure 7, a backbone LAN with nodes in each district
There are 20 branch lines in each district, and a branch line of the l group, AN2.
1, 22, and 23, communication between branch LANs is
It is reasonable to connect each branch LAN to a node of the trunk LAN 20 and use the transmission path of the trunk LAN 20.

Support for another group 1. If there is AN, these are also included in the basic 1. Connect to the node of AN20 and connect to the main LAN
It is reasonable to use 20 transmission paths.

In the above case, each branch line LAN21, 22 of one group
．． It is desirable that 23 be regarded as one LAN and can be monitored and controlled.

[Conventional technology]

Figure 8 shows the conventional trunk LAN and one group of branch LANs.
FIG.

Previously, the main LA was on branch line LAN21.22 of the same group.
When communicating using the N20 transmission path, as shown in FIG.
A so-called bridge is provided to connect the nodes 12 and 13 of the LAN 21.22 via an interface, and communication is performed via the branch line LAN 21.22. Bridge, core LAN20. I was using the bridge and branch line LAN22.

In this case, since the branch lines LAN21.22 are each independent LAN even in the same group, it is difficult to monitor and control another branch line LAN, and the branch line LAN21.22
Each monitors and controls nodes and transmission lines in order to establish the RAS function (loopback in the event of a transmission line failure, switching to a backup transmission line in the event of a failure of the working transmission line, control of node failures, etc.). (time-through, etc.) Monitoring device l011
7 was installed to maintain the reliability of branch lines LAN21 and 22.

In FIG. 8, reference numeral 4 indicates a central monitoring device that monitors and controls nodes and transmission lines in order to establish the RAS function of the backbone LAN 20, and 2, 11, 14, and 15 indicate nodes.

[Problem to be solved by the invention]

However, in the conventional connection method described above, each branch line LAN
Each system requires a monitoring device, making it expensive and complicated.

An object of the present invention is to provide an inter-LAN connection method in which a group's branch LANs are regarded as one LAN and can be monitored and controlled by one monitoring device.

[Means to solve the problem] FIG. 1 is a diagram showing the principle of the present invention.

As shown in FIG. 1, there is a loop-shaped trunk LAN 20 having dual transmission paths in opposite directions, and a plurality of branch lines LANs 21.22 in one group, and each branch line LAN 21.22
When communication between nodes 1. 3, set a group address, and specify whether to erase the header part at the receiving node or at the transmitting node when the packet returns from the main LAN 20. A region 40 is provided, and a branch line LAN 2 of the main LAN 20 is provided.
The node 1.3 connected to node 1.22 is controlled as follows by the control means.

■In node 1, the data received from the active transmission line of the branch LAN 21 is set as the source address in the packet header section to the address of own node l, the destination address as the group address, and the erase destination as the destination node. The node 3 with the group address that sent the packet to the transmission path and received the packet retains the source address, deletes the packet header, and transmits the data to the active transmission path of the connected branch LAN 22. The data received from the backup transmission line is
The source address in the packet header section is the address of the own node 3, the destination address is the address of the node 1 that held it, and the erase destination is the destination.

Any source node may send the data to the working transmission line, and the node l having the source address that received the packet transmits the data to the backup transmission line of the connected branch LAN 21.

■If the active transmission line of the main LAN 20 is switched to the protection transmission line, contrary to the above, the data received from the protection transmission line of the branch LAN 22 will be sent with the source address in the packet header. The address of own node 3 is set as the destination address, the group address is set as the destination address, and the erase destination is sent to the backup transmission path as the destination node erased. Node 1 of the group address that received the packet retains the source address and deletes the packet. The header section is deleted and the data is sent to the backup transmission path of the connected branch LAN 21, and the data received from the working transmission path of the branch LAN 21 is set to the source address of the packet header section of the own node 1.
, the destination address is the address of node 3 that held it, and the erase destination is the destination.

Any source node may be used to send the data to the protection transmission line, and the node 3 having the source address that received the packet transmits the data to the working transmission line of the branch LAN 22 to which it is connected.

(Function) According to the present invention, the working and backup transmission lines of each branch LAN 21.22 are connected to each node 1.3 of the backbone LAN 20, with the node 1 side serving as the transmitting side and the node 3 side serving as the group transmission line. A typical example will be explained in which the address receiving side (in the case of FIG. 1, there are only nodes 1 and 3 connected to the branch LAN, so the group address receiving node is 3 in this case).

At node 1, the data received from the active transmission line of the branch LAN 21 is set as the source address in the packet header section to the address of own node 1, the destination address as the group address, and the erase destination as the destination node. The node 3 that receives the packet retains the source address, erases the packet header, and transmits the data to the active transmission path of the connected branch LAN 22.

In addition, the data received from the backup transmission line of branch line LAN22 is
The source address in the packet header section is the address of own node 3, and the destination address is the source node 1 that was retained.
In this case, the destination address is node l.
Therefore, the erase destination can be either the destination node or the source node, and the packet is sent to the working transmission line.
The data is transmitted to the backup transmission path of N21.

By doing this, the circulation order of data on the active transmission line of the branch LAN 21.22 is changed between the monitoring device 10 and the node 1.
1, 12, 13, 14.15, and the data circulation order on the protection transmission line is: monitoring device 10, nodes 15, 14,
13, 12.11.

In addition, when the working transmission line of the trunk 19 and AN 20 is switched to the protection transmission line, contrary to the above, the node: (then,
The data received from the backup transmission line of LAN22 is
The source address in the packet header section is the address of own node 3, the destination address is the group address, and the erase destination is the destination node erased, and the packet is sent to the backup transmission path, and the node 1 with the group address that received the packet ,
The source address is retained, the packet header section is deleted, and the data is sent to the backup transmission line of the connected branch LAN 21, and the data received from the working transmission line of the branch LAN 21 is
The source address in the packet header section is the address of own node 1, the destination address is the address of the node 3 that held it, and the erase destination is the destination.

Any source node may send the data to the backup transmission line, and the node 3 having the source address that received the packet transmits the data to the working transmission line of the connected branch lines LA and N22.

By doing this, the circulation order of data on the working transmission line of the branch LAN 21 and 22 is the same as in the normal case.
Monitoring device IO, nodes 1.1, 12゜13.14.15
Therefore, the data circulation order on the backup transmission path is
0. The node becomes 15.1413.12.11.

Therefore, of course, when the backbone LAN 20 is normal.

Even if the working transmission line is switched to the backup transmission line or looped back, the order of data circulation on each branch line LA and N will not change, and the data will circulate on each branch line LAN, and the data will be transferred to the group branch line LAN. Since the branch line LANs 21 and 22 can be regarded as one LAN, one monitoring device 10 can monitor and control the branch line LANs 21 and 22.

〔Example〕

FIG. 2 is a diagram showing the connection between the backbone LAN of the embodiment of the present invention and the branch 1iI LAN of one group and the frame format of the packet, and FIG. 3 is a diagram showing the backbone LAN of the embodiment of the present invention.
FIG. 4 is a diagram showing the data flow direction when a loopback occurs due to a transmission line failure in the embodiment of the present invention, and FIG. 5 is a diagram showing the main part of the N node. FIG. 6 is a diagram showing the flow direction of data at the time of system switching, and FIG. 6 is a diagram showing transmission line control in the case of loopback as an example.

FIG. 2 shows an example in which there are two backbone LANs as a group, and as shown in (A), the backbone LAN 20 includes a central monitoring device 4. Node 1, 2
．． 3, and a working transmission line and a protection transmission line running in opposite directions.

The branch LAN 21 includes a monitoring device 10. which monitors and controls transmission lines and nodes of the branch LAN 21.22. Nodes 11, 12.
The branch LAN 22 consists of a working transmission line and a backup transmission line running in opposite directions to each other. It consists of a working transmission line and a backup transmission line that run in opposite directions.

The active transmission line and backup transmission line of the branch line LAN21 are connected to the node 1 of the trunk LAN 20, and the branch line L is connected to the node 3.
The working transmission line and backup transmission line of AN22 are connected.

The frame format of the packet of the backbone LAN 20 is as shown in FIG.
Data area (branch LAN destination).

(including the sender's address), and the header includes USD W4 area 4 indicating whether the packet is in use or not.
3. A TN area 40 for specifying the erase destination of the header/ender section, a destination address (DA) Off area 41. Sender address CS
A) It consists of 9M area 42.

Each node 1, 2.3 of the backbone LAN 20 has a configuration as shown in FIG.
The TN and USD analysis unit 51 analyzes whether the data includes a group address and is addressed to the own node, what is the erase destination specified, and whether the packet is in use.1.If the packet is not addressed to the own node, it is Control unit 52. Transmission control unit 59. The data is sent to the next node via the multiplexer 57 selector 56, and if it is addressed to the own node, the data and source address are sent to the reception controller 5.
Line set 6 to which the branch line LAN is connected via 2
0, the source address is held in the SA image holding 53, and the data is sent to the branch LAN.

Also, data from the branch LAN is group address or S
The source address held by the A-image holding unit 53 is selectively added as the destination address by the selector 55 and sent to the transmission control unit 59, whereupon the header section of the packet is deleted at the destination. Specify whether to delete the packet at the sender when it returns, and mark the packet as being in use.
It is sent to the multiplexing section 57.

The multiplexer 57 adds the address of its own node as a source address, forms a packet as shown in FIG. 2(B), and transmits it to the transmission path via the selector 56.

Note that when bypassing is required due to a node failure or the like, the selector 56 selects the bypass side and performs the bypass.

Note that FIG. 3 shows only the active transmission line system of the backbone LAN, and there is of course a protection transmission line system that has the same configuration but in the opposite direction.

Therefore, in the normal case, the branch line LAN21.22 in Figure 2
Explain the communication between.

In node 1, the data received from the working transmission line of the branch LAN 21 is transmitted with the source address in the packet header section set as the address of own node 1, the destination address set as the group address, and the erase destination set as the destination node erased. Node 3, which received the packet, retains the address of node 1 as the source address. If there are more than one, the branch lines LAN of the group are arranged in order by group address. ), the packet header part is deleted and the data is transmitted to the active transmission line of the connected branch LAN 22.

Next, the node 3 receives the data from the active transmission line of the branch LAN 22, sets the source address in the packet header to the address of its own node 3, and sets the destination address to the address of the node l holding it, Also, the erasure destination is sent to the working transmission line as destination node erasure.

In this way, the branch line LANs of the group are arranged in l order.

In addition, in node 3, the 1.-Y received from the backup transmission line of branch 1iLAN 22 sets the source address in the packet header part to the address of its own node 3, and the destination address is set to the address of node 1, which is the source that holds it. Address taker 71, in this case, the destination address is specified as the address of notebook 1, so the erase destination can be either the destination or the source node 1111, and the packet is sent to the working transmission path, and the node that received the packet L is a branch line LA that retains the source address and deletes the packet header.
The data is transmitted to the backup transmission line of N21.

From this point of view, the branch line LA, N21゜22
The data circulation order of the working transmission path is monitoring device io, nodes 11, 12, 13, 14, 15, and the data circulation order of the protection transmission path is monitoring device 10. node 15,1
4. ．． 13, 12.11.

Next, as shown in FIG. 4, node 2 of the backbone LAN 20,
The flow of data when a loopback is performed due to a transmission path failure between 3 and 3 will be explained.

Incidentally, FIG. 4 shows the flow of data from the working transmission line of the branch line LAN 21.22.

In this case, loopback is performed at node 2.3 as shown in FIG. As shown in (B), node l does not control to select a backup transmission path and transfer data onto it, as shown in (5).

In this way, at node L3, branch line 1°AN21
．． Since the data from the working transmission line of LAN22 is transmitted to the main working transmission line of AN20 and circulates, the data is sent to the main working transmission line of AN20.
．． The order of data circulation in No. 22 is unchanged from the normal case.

Of course, although not shown in FIG. 4, the branch line LAN21.
Since the data from the backup transmission line 22 is sent to the working transmission line of the main LAN 20 and circulates, the data is transmitted to the main transmission line 21.
(2) The start number of the data cycle does not change from the normal case.

Next, as shown in FIG. 5, the flow of data will be explained when the active transmission line of the backbone LAN 20 becomes impaired and the backup transmission line can be used.

In FIG. 5, the flow of data and evening data from the backup transmission line of branch line LAN 21 and 22 is indicated by iL.

In this case, at node ↓, 3, branch line LAN21.22
The destination of data from the backup transmission line is group address, the source address is '', and the data transmission from the working transmission line (f').

First, the source address is 1, which is the address of the node that received the group address packet and held at 1, and the node address is 1, and the node address is 1, which is the source. Since it is transmitted to the backup transmission line of AN20, the child side 4j of branch line LAN21.22 to
The data from the transmission line is the preliminary transmission speed g76- of the main LAN 20.
The data from the active transmission line of branch 11 LAN 21 and 22 is also transmitted via the backup transmission line of the main LAN 20 to the group's branch line LA.
It is transmitted by circulating around the N working transmission line, and the branch line LA
The cyclic order of N21.22 does not change from the normal case.

Therefore, not only when the trunk LAN 20 is normal, but also when the working transmission line is switched to the backup transmission line, or when the RAS function is performed, such as when looping back, each branch line LA
The circulation order of N data does not change, and the data is sent to each branch line LA.
Since the branch line LAN of the group can be regarded as one LAN, one monitoring device 10 can monitor the branch line LAN21.
．． 22 monitoring and control becomes possible.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the backbone LAN2
Not only when 0 is normal, but also when the RAS function is activated, such as when the working transmission line is switched to the backup transmission line or when loopback is performed, the data circulation order of each branch LAN does not change and the data is Each sentence goes around 1IIALAN,
Since the branch ILAN-t of the group can be regarded as one LAN, one monitoring device IO can monitor and control the branch lines LAN 21 and 22, which has the effect of making the system inexpensive and simple.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention. FIG. 2 is a diagram showing the connection between a backbone LAN and one group of branch LANs and the packet frame format in an embodiment of the present invention. FIG. 3 is an embodiment of the present invention. FIG. 4 is a diagram showing the data flow direction when a loopback occurs due to a transmission path failure in the embodiment of the present invention, and FIG. 5 is a diagram showing the transmission direction in the embodiment of the present invention. Figure 6 is a diagram showing the direction of data flow when switching systems due to a path failure; Figure 6 is a diagram showing transmission line control in the case of an example of a loop bank; Figure 7 is an explanatory diagram of a system to which the present invention is applied; Figure 8 1 is a diagram showing a connection between a conventional backbone LAN and one group of branch line LANs. In the figure, 1.2,3. 11 to 1 → are nodes, 4 is a central monitoring device, 10.17 is a monitoring device, 20 is a backbone local area network, 21.22 is a branch local area network, 40 is an erase destination specified area, 41 is a destination address lpMM . 42 is a source address area, 43 is an area indicating whether or not it is in use, 50 is a separation unit, 51 is a DA, TN, USD analysis unit, 52 is a reception control unit, 53 is an SA holding unit, 54 is a group address, 55 and 56 are selectors, 57 is a multiplexing unit, 58 is a transmission address, 59 is a transmission control unit, and 60 to 62 are line sets.

Claims (1)

[Claims] There is a loop-shaped backbone local area network (20) having dual transmission lines in opposite directions, and a plurality of branch local area networks (21, 22) in one group, each branch local area Network (21, 2
2) to the backbone local area network (2).
0), the working and backup transmission lines of each branch local area network (21, 22) are connected to each node (1, 3) of the core local area network (20). , a group address is set, and the packet of the core local area network (20) has an erasure destination designation area indicating whether the header is to be erased at the receiving node or at the transmitting node when it returns after one round. (40), and connected nodes (1, 3) of the branch local area network of the backbone local area network (20).
), the control means controls whether [1] the connected branch local area network (2
The data received from the current transmission line in 1) has the source address in the packet header part as the own node (1) address, and
The destination address is set as a group address, and the erase destination is sent to the active transmission path as the destination node erased, and the node (3) with the group address that received the packet retains the source address and erases the packet header. Branch local area network (22) connecting data
The data sent to the active transmission line of the branch local area network (22) and received from the protection transmission line of the branch local area network (22) has the source address in the packet header as the local node (3) address, and the destination address as the retained transmission line. The source address (1) is set, and the erasure destination can be either the destination or the source node, and the packet is sent to the active transmission path, and the node (1) with the source address that received the packet is the connected branch local area network. (21)
[2] When the working transmission line of the core local area network (20) is switched to the backup transmission line, contrary to the above, the data is transmitted to the backup transmission line of the connected branch local area network (20). 22) The data received from the protection transmission path is sent to the protection transmission path with the source address in the packet header section set as the own node (3) address, the destination address set as the group address, and the erase destination set as the destination node erased. and the node of the group address that received the packet (1)
retains the source address, erases the packet header, and sends the data to the backup transmission line of the connected branch local area network (21), and from the working transmission line of the branch local area network (21). The received data is sent to the backup transmission path with the source address in the packet header section as the own node address, the destination address as the retained source address, and the erase destination as either the destination or the source node. The node (3) with the source address that received the packet is connected to the branch local area network (22)
A method for connecting local area networks, characterized in that by transmitting data to a working transmission line of a group, it is possible to monitor and control a branch local area network of a group by regarding it as one local area network.