Method for judging spring grouping ring topology stability

Abstract

This invention relates to a judgment method for stability of spring packet ring topology including the following steps: a topology timing module sends test information of topology stability to a topology information receiving and processing module in every other period of time, which calls a state test machine of the stability of topology to process it to compute the CRC value of the current topology list and compare with the CRC value of the last period to judge if the topology has changed, which can test the stability topology of spring packet ring effectively.

Description

technical field [0001] The invention relates to a method for judging the topology stability of an RPR (Resilient Packet Ring, resilient packet ring), more specifically, a method for judging the topology stability of a resilient packet ring in an Ethernet switch device. Background technique [0002] IEEE standard draft P802.17 provides the use method and physical layer specification of RPR. Resilient packet ring is a metropolitan area network technology that supports data transmission between sites interconnected in a double-ring configuration. Due to its functional characteristics such as topology discovery, loop protection, and bandwidth allocation, it has received more and more attention in the field of communication technology. and apply. [0003] The RPR has two loops with opposite directions, and each station on the ring periodically broadcasts slow topology protection control frames or broadcasts fast topology protection control frames when topology changes are detect...

AI Technical Summary

Problems solved by technology

This method involves the maintenance of two state machines and two timers, and the operability is poor

Among them, the topology protection frame analysis state machine needs to compare the frame information with the current topology entry, and give the topology change flag; and another state machine for checking the validity of the topology needs to update the timer according to the topology change flag or after the timer expires Giving an indication of whether the topology is stable has certain problems in work efficiency; in addition, this method has certain dependencies. In the case of a topology change caused by a local physical link failure, the site cannot immediately receive topology protection frames, so Topological stability cannot be effectively tested

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