OpenFlow switch flow table regulation method
An adjustment method and switch technology, applied in the field of network technology applications, can solve problems such as failure to quantitatively analyze computing resources, flow table resource usage, inability to achieve efficient and normal data flow transmission, and adjustment of flow table entry survival time and priority, etc. Achieve the effect of improving average throughput, efficient and normal forwarding, and improving hit rate
Active Publication Date: 2018-09-07
NANJING UNIV OF POSTS & TELECOMM
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[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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[0055] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0056] Such as figure 1 Shown, described a kind of OpenFlow switch flow table adjustment method, comprises the following steps:
[0057] Step (1): Initialize the data flow of the network, and set the initial value of the negative exponential distribution parameter, and the initial value of the computing resource consumption for processing a packet-in message;
[0058] Step (2): The controller obtains the maximum storage capacity of flow table items and the number of active flow table items in the OpenFlow switch by sending an of.ofp_stats_request() message to the OpenFlow switch within a set time period;
[0059] Step (3): Calculate the proportion of activity flow entries; the formula for calculating the proportion of activity flow entries is as follows:
[0060]
[0061] Among them, ξ is the proportion of active flow entries, m is the num...
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The invention discloses an OpenFlow switch flow table regulation method which comprises the following steps of: carrying out initialization on data flow of a network and setting a parameter initial value; by a controller, acquiring maximum storage capacity of a local flow table entry and the number of mobile flow table entries; calculating a ratio of the mobile flow table entries; establishing a data packet length independent distribution model; calculating a time interval length of the flow table entries; calculating a network data flow average bandwidth and a data flow number; setting flow table entry default Tidle and updating the network average bandwidth and the data flow number; calculating the number of packet-in messages, flow table resource cost, controller resource cost, a flow table resource preference degree and a calculation resource preference degree; when the ratio of the mobile flow table entries is excessively high, setting an idle_timeout value of the flow table entrywith a low priority as zero and carrying out deleting on the flow table entry; and when the ratio of the mobile flow table entries is in a preset range, carrying out corresponding processing on a flow table by the controller. The OpenFlow switch flow table regulation method has the advantage of implementing high-efficiency transmission of the network data flow.
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...
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Login to View More IPC IPC(8): H04L12/759H04L12/741H04L45/28H04L45/74
CPCH04L45/028H04L45/74
Inventor 徐小龙胡留赟孙雁飞戎汉中段卫华朱洁刘茜萍张洁王俊昌胥备
Owner NANJING UNIV OF POSTS & TELECOMM