An openflow switch flow table adjustment method

Abstract

The invention discloses a flow table adjustment method of an OpenFlow switch, comprising the following steps: initializing a data flow of a network and setting initial values ​​of parameters; a controller obtains the maximum storage capacity of local flow table items and the number of active flow table items; calculating The proportion of active flow entries; establish an independent distribution model of data packet length; calculate the time interval length of flow entries; calculate the average bandwidth of network data flow and the number of data flows; set the default T of flow entries idle And update the average network bandwidth and the number of data streams; calculate the number of packet-in messages, flow table resource cost, controller resource cost, flow table resource preference, and computing resource preference; when the proportion of active flow entries is too high, set The idle_timeout value of the flow table entry with low priority is zero and the flow table entry is deleted; when the proportion of active flow table entries is within the preset range, the controller processes the flow table accordingly. The present invention has the advantage of realizing efficient transmission of network data streams.

Description

technical field [0001] The invention relates to the application field of network technology, in particular to a flow table adjustment method of an OpenFlow switch. Background technique [0002] At present, the huge network traffic in large-scale data centers on the Internet has brought enormous pressure on the data forwarding plane of the SDN network, and complex and diverse new services have higher and higher requirements for the single-point forwarding capability of the network; in addition, due to the Most of the flow tables are stored by Ternary content addressable memory (TCAM). Due to the limitation of TCAM hardware capacity and price, existing switches only have about 1000 flow table entries, and the flow table resources are limited. When the data flow arrives at the switch node, whether it can be allocated to the flow table resource directly determines whether the data can be forwarded normally. In order to ensure that the data flow can be allocated to the flow table...

AI Technical Summary

Problems solved by technology

[0005] The above methods all have the following disadvantages: none of the current network operation status and computing resources, flow table resource usage are quantitatively analyzed, nor are the requirements of different flow characteristics on flow table items considered, and it is difficult to dynamically adjust flow table items according to actual network conditions The survival time and priority of the network cannot achieve the effect of improving the utilization rate of flow entries, and cannot realize the efficient and normal transmission of data flows in the network

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