Method and device for looped network protection

Abstract

The invention provides a method and a device for looped network protection. The method is applied in an secondary node of a looped network; the main node and the secondary node of the looped network both comprise looped ports connected with a central network; the method comprises the following steps: the secondary node receives a detection message transmitted by a main port and an secondary port of the main node; when the secondary node does not receive the detection message transmitted by the main bode within preset time, the looped port of the secondary node connected to the central network is changed from a blocked state to an opened state; the address fresh operation of the secondary node is carried out, and an address fresh message is transmitted to the direction of the main port so as to instruct a transmission node which receives the address refresh message to carry out address refresh, thereby changing the transferring direct of the transmission node to a service message. With the adoption of the method and the device, the problem that the service flow may be interrupted because of faults at a looped network is avoided effectively.

Description

technical field [0001] The invention relates to ring network protection, in particular to a method and device for protecting service flow on the ring network. Background technique [0002] On the expressway, due to the needs of traffic management, monitoring equipment may need to be deployed in different locations. In the prior art, a ring network is used to connect multiple monitoring devices (such as encoders), such as figure 1 shown. In actual engineering construction, the two optical fibers from node A to node F are usually not buried on both sides of the expressway, but buried in the isolation zone in the middle of the expressway, and the two optical fibers are usually in the same protective sleeve Do the wiring. In this case, once the optical fiber resource is damaged, two optical fibers are usually damaged at the same time. Please refer to figure 2 , assuming that a traffic accident causes damage to the optical fiber between nodes C and D, at this time the optic...

AI Technical Summary

Problems solved by technology

However, the distance of the expressway is very long, which may reach hundreds or even thousands of kilometers. If many video surveillance encoding devices are connected to the monitoring heart network through optical fibers, a lot of optical fiber resources will be wasted, and the cost of networking is very high. Although it can Some optimizations have been made, but user acceptance is still low

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