JPS6257336A - Intercommunicaton networks repeater - Google Patents

Abstract

PURPOSE:To recognize quickly in a transmission sender communication network the occurrence of a fault in information transferred by a repeater by generating faulty information information decided in advance through the reception of faulty information and returning the sender communication network. CONSTITUTION:A packet reception section 11 fetches a packet 4 sent from a communication node 22 via a loop transmission line 21, the packet 4 is stored in a packet storage section 12 and a packet transmission section 13 fetches the packet 4 stored in the packet storage section 12 as a transfer packet 5 and transfers it to a communication node 32 via a branch shaped transmission line 31. If the transfer of the transfer packet 5 is faulty, the result of collation between the transfer packet 5 and the received packet 4 in the transmission fault detection section 131 of the packet transmission section 13 is dissident and faulty information 6 is sent from the said transmission faulty detection section 131. A faulty notice packet generating section 16 receiving the information 6 generates a fault notice packet 7 defined by the communication rules between the communication nodes 32 and 22 to sent it to the packet sending section 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intercommunication network relay device that relays information between communication networks.

[Conventional technology]

In general, a communication network consists of a plurality of communication nodes and a packet transmission path that transmits packets (information) sent or received by the communication nodes, and communication networks are used to relay packets between communication networks. Intermediate relay equipment is used. In a nine-complex communication network using such a relay device, received information from a source communication node is accumulated in the relay device and then transferred to a destination communication node, and the destination communication node responds by reporting reception of the packet. The packet is being sent back to the source communication node. In addition, by returning the response packet, the source communication node can recognize that the transmitted packet has been reliably transferred to the destination communication node.

[Problem that the invention seeks to solve]

However, in such an information transfer method between communication networks, after the packet transfer from the source communication node to the relay device is completed normally, the packet is not transferred normally from the relay device to the destination communication node. In such a case, the source communication node receives a response packet from the destination communication node and recognizes that the packet transfer has failed only by the presence or absence of this response packet.

Therefore, for the source communication node to recognize a failure in packet transfer, it takes a relatively long time to determine that no response packet has been returned, which causes a delay in responding. Ta.

[Means for solving problems]

The present invention was made in view of these problems, and
The transfer information to be transferred to the destination communication network side is compared with the information received from the source communication network side, and if the comparison result does not match, fault information is sent, and in response to this fault information, a predetermined This system generates fault notification information based on the received fault notification information, and sends this fault notification information back to the source communication network.

[Operation] Therefore, according to the device according to the present invention, when a failure occurs in the information transferred by the relay device, failure notification information is sent back to the source communication network.

〔Example〕

Hereinafter, the inter-communication network relay device according to the present invention will be explained in detail. FIG. 1 is an internal block diagram showing an embodiment of this communication network relay device, and FIG. 2 is a block diagram of a composite communication network configured using this relay device fRt-. In FIG. 2, numeral 1 is a relay device between communication networks, which is a feature of the present invention, and numerals 2 and 3 are communication networks. The communication network 2 includes a loop-shaped transmission path 21 and this loop-shaped transmission path 2
The loop transmission line 21 is connected to the input/output terminal 1 & of the relay device 10 . In addition, the communication network 3 is
It is composed of a branch-shaped transmission line 31 and a plurality of communication nodes 32 connected to this branch-shaped transmission line 31, and the branch-shaped transmission line 31 is connected to the input/output terminal 1b of the relay device 1.
It is connected to the. The communication nodes 22 and 32 each have a transmitting/receiving function, and packets are transmitted and received via the loop-shaped transmission path 21 and the branch-shaped transmission path 31.

On the other hand, the relay device 1 has an internal configuration as shown in FIG. The packets received via the loop transmission path 21
It has the ability to transfer on. That is, packets input from the loop-shaped transmission path 21 via the input/output terminal 11 are received by the packet receiving unit 11, and the packets received by the packet receiving unit 11 are stored in the packet storage. The information is stored in the section 12. Then, this stored packet is received by the packet transmitter 13, and the packet transmitter 13 transfers the received packet to the branch-like transmission path 31 via the input/output terminal 1b. It is expressed as follows. Furthermore, packets input from the branch-like transmission path 31 via the input/output terminal 1b are in danger of being received by the packet receiving unit 14, and the packets received by the packet receiving unit 14 are stored in the packet storage. After being stored in the packet transmission section 12, the packet is taken into the packet transmission section 15 and transferred to the loop-shaped transmission line 21 via the input/output terminal 1a. The packet transmitters 13 and 15 each include a transmission failure detector 13.
1 and 151, this transmission failure detection section 13
1 and 151 compare the transfer packet transferred via the input/output terminals 1b and 1a with the received packet input via the input/output terminals 1a and 1b, and when the comparison results do not match, the failure information is displayed as a failure. Notification packet generation unit 1
6. The failure notification packet generation unit 16 receives the failure information sent by the transmission failure detection units 131 and 151, generates a failure notification packet, sends this failure notification packet to the packet transmission units 15 and 13, and sends the failure notification packet to the packet transmission units 15 and 13. 13 and 15 are designed to return this failure notification packet to the branch-like transmission line 31 and the loop-like transmission line 21. Note that the failure notification packet is defined in advance as a predetermined packet in the communication protocol between the communication node 22 of the communication network 2 and the communication node 32 of the communication network 3.

Next, the operation of the relay device configured as described above will be explained from a table with reference to FIG. That is, as an example of this operation, the operation when the communication node 22 connected to the loop-shaped transmission path 21 transfers a packet to the communication node 32 connected to the branch-shaped transmission path 31 via the relay device 1 will be explained. do. After receiving the packet 4 transmitted by the communication node 22 via the loop-shaped transmission path 21, the packet receiving unit 11 stores the packet 4 in the packet storage unit 12,
The packet transmitting unit 13 takes in the packet 4 stored in the packet storage unit 12 as a transfer packet 5, and transfers it to the communication node 32 via the branch-like transmission path 31. If the transfer of the transfer packet 5 is successfully performed, the operation of the relay device 1 is completed here, but if a failure occurs in the transfer of the transfer packet 5, the relay device 1 continues with the following operations. Do the following.

That is, if a failure occurs in the transfer of the transfer packet 5,
For example, if a failure occurs such that only some of the received packets 4 can be transferred, or all of the received packets 4 cannot be transferred, the transmission failure detection unit 131 of the packet transmission unit 13 will detect the transferred packet 5 and the received packet. The comparison result with packet 4 is non-matching, and the transmission failure detection unit 131 sends out failure information 6. Then, in response to the failure information 6, the failure notification packet generation unit 16 generates a failure notification packet T defined by the communication protocol between the communication nodes 32 and 22, and sends it to the packet transmission unit 15. It's crowded. Then, the packet transmitting unit 15 returns this failure notification bucket) 7 to the communication node 22 via the loop-shaped transmission path 21. The communication node 22, which is the source of the packet 4, receives the failure notification packet T and quickly recognizes that a failure has occurred in packet transfer.

Note that although the above-described operation has been described with respect to packet transfer from the communication node 22 connected to the loop-shaped transmission path 21 to the communication node 32 connected to the branch-shaped transmission path 31, the direction of packet transfer is reversed.

That is, it goes without saying that in the case of packet transfer from the communication node 32 to the communication node 22, a failure in the packet transfer is immediately recognized in the same way.

〔Effect of the invention〕

As explained above, according to the communication network relay device according to the present invention, the transfer information to be transferred to the destination communication network side is compared with the information received from the source communication network side, and if the comparison result does not match, a failure occurs. The system transmits information, receives this fault information, generates predetermined fault notification information, and sends this fault notification information back to the source communication network, so there is no fault in the information transferred by the relay device. This allows the source communication network to quickly recognize that the occurrence of a problem has occurred.

[Brief explanation of drawings]

FIG. 1 is an internal block configuration diagram showing an embodiment of an intercommunication network relay device according to the present invention, FIG. 2 is a block configuration diagram of a composite communication network configured using this relay device, and FIG. FIG. 2 is an explanatory diagram of the operation of a relay device in a composite communication network. 1...Relay device, 2,3...Communication network, 22.32...Communication node, 11゜14...-
Packet receiving unit, 13, 15, fist...packet transmitting unit,
131,151...Transmission failure detection unit, 16...
...Fault notification packet generation unit.

Claims (1)

[Claims] In an intercommunication network relay device that transfers received information from a source communication network side to a destination communication network side, the information transferred by the device is compared with the received information, and when the comparison result does not match, a failure signal is sent. and a failure notification information generation means that generates predetermined failure notification information in response to a failure signal sent by the information failure detection means, and a failure notification generated by the failure notification information generation means. An intercommunication network relay device characterized in that the information is sent back to the source communication network.