A loop detection method and device

Abstract

The invention provides a loop detecting method and device. The method comprises that a network device generates a loop detection user data protocol UDP message; the network device queries a route corresponding to a target network protocol IP address of the loop detection UDP message; the network device transmits the loop detection UDP message by using the route; the network device receives a first server data message; and the network device determines that the route of a target IP address of a second server data message is a loop route when the first server data message matches the loop detection UDP message. The network device generates the loop detection UDP message and forwards the same to another device. When the network device receives the loop detection UDP message again, namely the loop detection UDP message is returned to the network device after being forwarded by multiple devices, a loop is formed in a network and the route corresponding to the target IP address of the loop detection UDP message is determined as the loop route. As a result, the loop route in the network can be effectively and timely detected and eliminated in order that invalid forward of server data messages is prevented.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a loop detection method and device. Background technique [0002] During network deployment, service data packet transmission loops may occur due to reasons such as router configuration errors. like figure 1 As shown, network device A, network device B, network device C, and network device D form a service data message transmission loop, and the service data message is forwarded by network device A to network device B, and then forwarded by network device B to the network Device C, then forwards from network device C to network device D, and finally forwards from network device D to network device A. Circularly forwarding the service data message in the service data message transmission loop until the time to live (Time To Live, TTL) of the service data message is reduced to 0 or 1, discarding the service data message . [0003] The service data packets cycli...

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a loop detection method and device, which can detect the loop in the transmission path of the service data message, and solve the problem in the prior art that the service data message is discarded due to the routing loop

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