Automatic discovery method based on topological structure of multi-service transmission looped network

Abstract

The invention relates to an automatic discovery method based on multi-service transmission ring network topology. Each node periodically sends topology auto-discovery frames along the ring; upon receiving topology auto-discovery frames, it updates the record of the source sending node in the network topology linked list of the node, and updates the change value of the number of ring network nodes and the ring stability flag and records them in topology frame, and forward it to the next node; when the topology auto-discovery frame returns to the source node, the local topology stability judgment is performed according to the change value of the ring network node number and the ring stability flag; after the topology is stable, each Nodes form a topological structure graph and save it on this node.

Description

technical field [0001] The invention relates to the field of network management, in particular to a method for automatic discovery of dynamic topological structure based on multi-service transmission ring network in network management. Background technique [0002] With the rapid development of IP data services with packet switching as the transmission mechanism, it is difficult for SDH (Synchronous Digital Hierarchy) networks to meet the needs of voice services while carrying IP services efficiently. So the concept of MSTP appeared, MSTP (Multi-Service Transport Platform multi-service transmission platform) refers to based on the SDH platform, while realizing TDM (Time Division Multiplexing time division multiplexing technology), ATM (Asynchronous Transfer Mode asynchronous transmission mode), Ethernet The access, processing and transmission of various services, such as multi-service nodes that provide unified network management, are also called a new generation of SDH. MS...

AI Technical Summary

Problems solved by technology

[0008] 1. From the description of the solution, it can be seen that the MAC address needs to participate in data transmission and topology calculation, which will directly lead to the slow speed of network topology calculation;

[0009] 2. This method has a certain dependence on the physical layer and the MAC layer. In the case of topology changes caused by local physical link failures, topology protection frames cannot be obtained, and the stability of the topology cannot be effectively detected;

[0010] 3. There is no provision for the transition state of topology stability, that is, the lack of a definition of the intermediate state of topology from unstable to stable state-metastable state, which may make the stability of the entire topology in an unknowable state

[0011] Due to the above shortcomings, it is not feasible to completely copy the topology automatic discovery scheme of the RPR ring network in the MSTP ring network. A simple and effective automatic topology discovery method is needed to make a quick judgment on the topology of the entire ring network. And identification, can correctly lock the stable state of the ring network, especially the topology automatic discovery method in the case of a ring network changing from a closed loop to an open loop state or a faulty network that is itself an open loop

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