Improved single loop redundancy backup implementation based on rapid spanning tree protocol (RSTP)

Abstract

The invention discloses improved single loop redundancy backup implementation based on a rapid spanning tree protocol (RSTP). The idea based on loop backup is adopted to thoroughly rewrite the election algorithm and the self-healing algorithm of a root network device of the RSTP. Election of the root network device is limited between switches at two ends after link up of the last ringed network cable, and a group ring port after loop forming is only switched between plugging state and transmitting state, sends RSTP bridge protocol data unit (BPDU) messages only when having connection change and never sends the RSTP BPDU messages after the network is stabilized. Therefore, self-healing time of a looped network can be greatly reduced, and reliability of the network is improved.

Description

[0001] Field [0002] The invention relates to the realization of an RSTP-based improved single-loop redundant backup. In the field of industrial communication, loop redundancy backup has always been a very important topic. Commonly used link redundancy backup methods include port aggregation (TRUNK), loop backup, etc., an improved single-loop redundancy backup based on RSTP is based on the idea of ​​loop backup, based on the standard RSTP protocol , completely rewrite the root bridge election process and the state machine conversion mechanism, so that RSTP only realizes the link redundancy backup function of a single ring, and at the same time greatly shortens the self-healing time of RSTP. After testing, an RSTP-based improved single-loop redundant backup implementation can achieve the effect of four switches forming a single-loop network, and the theoretical self-healing time is controlled at about 15ms, which greatly improves the reliability of the network. technical back...

AI Technical Summary

Problems solved by technology

[0004] The first defect: Since the entire switching network will eventually become a spanning tree, it will lead to a longer convergence time when the network scale is relatively large, and the impact of topology changes is also greater

[0005] The second defect: in the case of a symmetrical network structure, the single spanning tree will not cause the network to temporarily fail to communicate

However, when the network structure is asymmetrical, the single spanning tree will affect the connectivity of the network, and there will be several seconds or even tens of seconds of inability to communicate between network devices.

This situation will cause a huge waste of bandwidth in a large network structure (for example: metropolitan area network)

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