Control method and control device of software defined network

Abstract

The invention discloses a control method and a control device of a software defined network. The control method comprises the following steps of when a load of a link is greater than a preset congestion upper limit, determining the link as a link with highest critical degree; and changing a forwarding flow table of a data flow in the link with the highest critical degree and delivering the forwarding flow table, so as to enable the data flow to transmit according to a forwarding routing corresponding to the forwarding flow table. When a controller determines the link with the highest critical degree, the forwarding flow table of the data flow passing the link with the highest critical degree is modified, so that the data flow in the link with the highest critical degree is transmitted through other forwarding paths, therefore, the congestion of the link with highest critical degree is relieved, and the network efficiency is improved.

Description

technical field

[0001] The present application relates to the field of communication technologies, and in particular to a control method and a control device for a software-defined network. Background technique

[0002] In order to solve the problem of network congestion in the process of data communication, the software-defined network (Software Defined Network) based on the Openflow protocol has been widely used; the software-defined network includes Openflow switches and controllers; the controller maintains the network topology and establishes end-to-end data The transmitted flow table, and sends the flow table to the corresponding Openflow switch, so that the data flow is transmitted in the forwarding path determined by the flow table.

[0003] In order to avoid network congestion, the controller needs to monitor the traffic status of the network to avoid serious network congestion problems. At present, the controller monitors the link load status of the network core l...

Images