QoS (Quality of Service)-aware OpenFlow flow table hierarchical storage architecture and application

The invention discloses a QoS (Quality of Service)-aware OpenFlow flow table hierarchical storage architecture and application, and the architecture provided by the invention stores a high-priority flow in a TCAM (Ternary Content Addressable Memory), so that the grouping search performance of the high-priority flow is ensured; a Cuckoo hash structure is adopted to design an accurate flow cache mechanism and store low-priority and non-priority active accurate flows, so that data packets in the accurate flows directly hit caches, corresponding SRAM flow table entries are quickly found, the average flow table search time is remarkably shortened, and the performance of the OpenFlow switch is improved. According to the method, corresponding flow table searching speeds are provided for network flows with different priorities, wherein network packets in a high-priority flow directly hit a TCAM flow table, and corresponding flow table entries are quickly found; a hit Cuckoo cache is searched by a network packet in th