Method, device and system for loop path detection

Abstract

The embodiment of the invention discloses a method, device and system for loop path detection. The method for loop path detection comprises the following steps that a loop path existing in a network element is obtained from topological data of a port of the network element, the loop path is stored in a loop path table, and the topological data comprise identification information of the port and identification information of a next-level node connected with the port; when a medium access control address of the port of the network element is shifted, the loop path table is looked up according to the original identification information of the port and the shifted identification information, and the loop path on a protocol is obtained.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a loop path detection method, device and system. Background technique [0002] With the popularization and development of the Ethernet network, more and more communication devices (hereinafter collectively referred to as network elements) are deployed in the network, and the topology of the network elements in the network becomes more and more complex. [0003] The network topologies of communication operators mainly include ring and tree. [0004] The ring structure can realize link redundancy protection in the ring and improve the reliability of the network. This structure is usually deployed in a MAN (Metropolitan Area Network, Metropolitan Area Network). [0005] Based on Ethernet-based communication, in the ring structure, broadcast messages will be forwarded cyclically between network elements. This phenomenon is commonly known as "broadcast storm". Once thi...

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Problems solved by technology

[0009] 1. Periodically send packets to all physical ports in the network element, consuming the CPU resources of the network element;

[0010] 2. The detection mechanism depends on the network element to send and receive messages, and the timeliness of detection is not high;

[0011] 3. The detection message may be discarded on the network element of the forwarding path. For example, in the scenario of network congestion, the reliability is not high;

[0012] 4. The characteristic message (private protocol) may be wrongly processed in other network elements in the network. If other network elements do not recognize it as expected, it is regarded as data forwarding, but it is recognized and processed by it, and finally the detection message is discarded. , there is a compatibility problem between such devices;

[0013] 5. Only the starting point and end point of the loop can be known, but the complete path of the loop cannot be displayed. If the loop needs to be broken, it is necessary to check each network element separately, which is not conducive to the unified operation and maintenance of the customer network

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