The invention discloses a flow table consistency updating method in a software defined network. While whether the flow table needs to be updated or not is determined, a reason for updating the flow table is also determined; for flow table updating caused by different reasons, a link to be updated in links needing to be subjected to flow table updating is updated by adopting different methods respectively; a group of to-be-updated data streams with the least number are determined; under the condition that the link is not congested, a new path for each data flow to be updated is selected; whether a loop is formed between the new path and the old path of the to-be-updated data flow or not is determined; the situations that loops are formed on new and old paths and the loops are not formed arerespectively based on different updating methods. After the switches to be updated on the new path and the old path are subjected to set division according to different flow table updating operationtypes, consistency updating is carried out on the flow tables of the switches according to the corresponding sequence for obtained switch sets; the problems of black holes, loops and the like can be prevented in a complex network environment.

Flow table consistency updating method in software-defined network

The invention, which belongs to the field of computer network flow scheduling, discloses a flow scheduling method for guaranteeing service quality in an SDN environment and particularly relates to a QoS-based routing and flow transmission path consistency updating completion method. According to the invention, under the condition that the network bandwidth occupancy rate is relatively high, for aservice flow reserved by a user, network resource fragments are integrated, a flow scheduling scheme is decided; and when the flow is scheduled, flow table items are dynamically updated to ensure flowtable updating consistency and prevent deadlock. After end node flow shaping, a burst flow is prevented from preempting bandwidth, and the service quality in the transmission process is ensured. By means of the mode, the network resource fragments can be integrated, the network bandwidth utilization rate is increased, more target flows are contained; meanwhile, the low packet loss rate of serviceflows is guaranteed.

Traffic scheduling method for guaranteeing service quality in SDN environment

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Traffic scheduling method for guaranteeing service quality in SDN environment