System and method for detecting loopback

Abstract

The invention provides a system and a method for detecting loopback. The system comprises a first switch and a second switch, wherein the first switch is connected with an optical line terminal, the second switch is connected with a terminal device, and the optical line terminal is used for generating a second-layer message for detecting a loopback phenomenon; the optical line terminal sends the second-layer message to the second switch through the first switch; the second switch broadcasts the second-layer message to the terminal device connected therewith; the optical line terminal judges that whether the returned second-layer message is received; and when the optical line terminal receives the returned second-layer message, the terminal device which returns the second-layer message is forbidden. According to the system and the method, loopback detection can be conducted on any type of terminal device without adding extra hardware.

Description

technical field [0001] The invention relates to the technical field of network equipment, in particular to a system and method for loopback detection. Background technique [0002] In various existing networking, due to configuration errors or network connection problems, forwarding loops often exist in the networking. If there is a forwarding loop in the network, after a network device such as network device 1 sends broadcast, multicast, unknown unicast and other messages, these messages may be forwarded by other network devices and then received by the network device 1 , and the network device 1 will re-forward these messages that have already been sent by itself, and repeat the cycle, resulting in a large number of repeated forwarding, which will cause a network storm in the network, thereby causing resource consumption and even network paralysis . [0003] There are two types of network loops, one is a single-port loop, that is, a port of a network device receives a me...

AI Technical Summary

Problems solved by technology

However, some old terminal devices often do not support the loopback detection function, so if the loopback detection operation needs to be performed on such terminal devices, the hardware of such terminal devices must be modified, which will undoubtedly consume a lot of manpower and material resources

[0005] It can be seen from the above that at present, different methods are often used for loopback detection for different terminal devices, and there is no unified method that can perform loopback detection for terminal devices

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