Abstract: When congestion occurs in a managed network or a managed device is too busy, an NMS (network management system) may acquire an improper state of themanaged device, therefore results in alarm vibration in the NMS. By the analysisof the causation and statistic nature of alarm vibration, a voting algorithm based on probability model is proposed to reduce alarm vibration and improve the efficiency of management. The algorithm takes a vote on the results of continuousdetection of a managed device's state to determine whether or not an alarm vibration has arisen in the NMS and eliminates the vibration occurred during the time range specified by a threshold. The validity of the proposed algorithm has been proved in actual public access wireless local area network management system.

Key words: :network management, fault management, fault detection, simple networkmanagement protocol, alarm vibration