Broadcast storm diagnosis method and device and computer storage medium

The invention provides a broadcast storm diagnosis method and device and a medium, and belongs to the field of communication. The method is used for diagnosing a broadcast storm in a local area network, the local area network comprises a backbone network and service sub-networks, the service sub-networks are connected with the backbone network, different service sub-networks correspond to different IP address fields, the backbone network comprises a plurality of network equipments. The method comprises the steps of: determining a first monitoring port in monitoring ports of network equipments, wherein the monitoring port is a port where the network equipment to which the monitoring port belongs is connected with another network equipment in the backbone network, and the first monitoring port is a monitoring port where the number of data packets sent within a first unit duration exceeds a first threshold value; and determining the cause of the broadcast storm according to the source IP address of the data pack