OpenFlow flow table energy-saving storage architecture supporting QoS (Quality of Service) and application thereof

Abstract

The invention provides an OpenFlow flow table energy-saving storage architecture supporting QoS (Quality of Service) and application of the OpenFlow flow table energy-saving storage architecture. Thearchitecture comprises three layers, namely a priority flow / elephant flow layer, a mouse flow layer and an active connection cache layer, wherein the priority flow / elephant flow layer adopts a TCAM and a DRAM as storage media, the mouse flow layer adopts an SRAM and a DRAM as storage media, the active connection cache layer adopts an SRAM as a storage medium, and a Cuckoo hash structure is adoptedto cache a mapping relationship between active connection and flow table entries in the TCAM. According to the architecture, the TCAM is adopted to preferentially store the identification fields of the priority flow table entries, and quick flow table lookup of priority data packets is realized, so that the network service quality is guaranteed. Meanwhile, a Cuckoo cache is designed to dynamically store the current active connection and the corresponding TCAM flow entry index value in the elephant flow; the cache is hit by most of the data packets, and the corresponding flow table item is found according to the address of the hit cache item, so that a TCAM flow table lookup process is bypassed, and the flow table lookup energy consumption overhead is greatly reduced.

Description

technical field [0001] The invention relates to the field of OpenFlow flow tables, in particular to a QoS-supporting OpenFlow flow table energy-saving storage architecture and an application thereof. Background technique [0002] In order to meet the different requirements of multimedia applications and cloud users for network transmission quality, improve the utilization rate of network resources, and ensure the quality of service (Quality of Service, QoS) has always been a hot issue in the network field. As a new type of network architecture, Software Defined Networking (SDN) separates the control logic from the data forwarding device, forms a logically centralized control plane, and obtains a global network view and status information. Therefore, compared with traditional networks, SDN's QoS management is simpler and more flexible. In an SDN network, the control plane uses global network information to designate specific forwarding decisions for different network flows a...

AI Technical Summary

Problems solved by technology

However, in the OpenFlow search process, often only the first data packet in a new flow will fail to be searched. After the new rules are issued by the controller, subsequent data packets will be successfully matched, so the energy saving effect is not good.

At the same time, its Bloom filter adopts a batch automatic update strategy, while the TCAM flow table adopts a single real-time update method, which leads to inconsistencies between the TCAM flow table and the filter, and reduces the accuracy of filter search

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