Faulty connection detection method and device

Abstract

The embodiment of the invention relates to the technical field of communication, in particular to a fault connection detection method and apparatus. The fault connection detection method and apparatus are used for accurately detecting whether each port in a looped network is in a normal connection state or not. A first port of a first apparatus receives a first message sent by a first port of a second apparatus, wherein the first message includes the address of an opposite terminal apparatus and the identification of an opposite terminal port; if the address of the first apparatus is same as the address of the opposite terminal apparatus, and the identification of the first port of the first apparatus is same as the identification of the opposite terminal port, it is confirmed that the first port of the first apparatus is in the normal connection state and the first port of the second apparatus is in the normal connection state. In the prior art, a method can only detect whether a link between two apparatuses is connected or not, however, the fault connection detection method can determine whether the first port of the first apparatus and the port of the opposite terminal apparatus of the first apparatus are in the normal connection state or not, and it can be accurately detected that whether each port in the looped network is in the normal connection state or not.

Description

technical field [0001] The embodiments of the present invention relate to the communication field, and in particular, to a method and device for detecting a faulty connection. Background technique [0002] When the network of the industrial control system is established, the ring network topology structure is generally adopted to realize the network link protection function. At present, the commonly used technology is the ring network redundancy technology (DT-Ring), and the distributed Redundancy (Distributed Redundancy Protocol, referred to as DRP) protocol. A variety of message protocols are defined in the DRP protocol. Link-check message is one of them. Link-check message is mainly used to detect the communication between two physically connected devices in the Ethernet ring network. Whether the link is connected. [0003] When the Ethernet ring network is networked, each device participating in the network has two ports, and each port has two interfaces: a receiving p...

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Problems solved by technology

[0007] It can be seen that in the above process, the link-check message is sent from port 211 to port 222, but port 211 receives the Rx response from port 232 as a true Link-check, and the existing technology cannot detect the following wrong connection methods: The sending port and the receiving port of the port 211 of the first device 210 are respectively connected to the port 222 of the second device 220 and the port 232 of the third device, and the sending port and the receiving port of the port 232 of the third device are respectively connected to the first device 210 The port 211 of and the port 212 of the first device 210; for figure 2 In the prior art, the first device 210 only determines that the port 211 sends a link-check message, and the port 211 receives the Rx response from the peer device as a true Link-check, that is, it determines that the port 211 and the peer The end devices are in a normal connection state. It can be seen that the link-check message in the prior art can only detect whether the link between the two physically connected devices in the Ethernet ring network is connected, and cannot accurately detect Whether each port of each device in the outgoing ring network is in a normal connection state

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