Traffic statistics method based on wildcard characters for use in software defined network (SDN)

Abstract

The invention discloses a traffic statistics method based on wildcard characters for use in a software defined network (SDN). The method comprises the following steps that: a controller partitions flow on SDN switches in the SDN by taking the wildcard characters as units to obtain flow sets; information about flow sets to be collected on the SDN switches is calculated by taking minimization of traffic statistics costs of the SDN switches as an optimization target; traffic statistics requests are sent to all the SDN switches according to the information about the flow sets to be collected on the SDN switches, wherein each request specifies one wildcard character on a certain SDN switch; the SDN switches parse wildcard character fields according to the traffic statistics requests, package traffic information of all flows matched with the wildcard characters to generate response packets, and transmit the response packets to the controller; and the controller generates traffic statistics information according to the collected response packets of all the SDN switches. Through adoption of the traffic statistics method, corresponding statistics tasks can be assigned to the switches according to the traffic condition and resource condition of a current network, and congestion of a control channel is avoided.

Description

technical field [0001] The invention belongs to the technical field of network traffic statistics, and in particular relates to a wildcard-based traffic statistics method in a software-defined network (Software Defined Network, SDN). Background technique [0002] Due to various limitations of the existing network architecture, the software-defined network (Software Defined Network, SDN) was born. SDN is a software-based network architecture, and its core idea is the separation of network data forwarding plane and control management plane. In traditional IP networks, network transmission devices (such as routers) need to be responsible for data forwarding functions and control logic functions respectively, so the control and management logic of traditional networks is very complicated. In a software-defined network, the separation of the control plane and the data plane simplifies the functions of the network transmission equipment. It only needs to be responsible for forwar...

AI Technical Summary

Problems solved by technology

Both of these methods consume a large amount of control link bandwidth and cause long switch processing delays

This will further affect packet forwarding and routing updates throughout the network

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