Construction method of coordination layer in software defined network (SDN) architecture

Abstract

The present invention provides a construction method of a coordination layer in a software defined network (SDN) architecture, belonging to the technical field of computer application. According to the method, a centralized coordination layer, that is an OpenFlow coordinator, is added between a control layer and a forwarding layer, so that multiple SDN controllers in the control layer cooperate with each other to share service load of the control layer, therefore, an OpenFlow control flow is scheduled flexibly among multiple application heterogeneous controllers, the demand of a manger in an actual network is met, and the availability and reliability of the whole SDN system are improved.

Description

technical field [0001] The invention relates to a method for constructing a coordination layer in an SDN architecture, and belongs to the technical field of computer applications. Background technique [0002] With the arrival of the era of "big things moving to the cloud", that is, big data, Internet of Things, mobile Internet, and cloud computing, the traditional underlying network architecture can no longer meet the needs of managers. The complex configuration of equipment is troublesome and slow, and various problems emerge one after another. Next-generation networks require programmable on-demand customization, centralized unified management, dynamic traffic monitoring, and automated deployment. These are the starting points for software-defined networking (SDN). [0003] The biggest feature of SDN is the complete separation of control and forwarding, in which the control layer realizes centralized control, software programmable, visualization, automation, etc., and th...

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Problems solved by technology

[0004] On the one hand, in the control layer, there are differences in the maturity of application functions between different northbound controllers. For example, some northbound controllers have more mature firewall functions, while some northbound controllers have more mature load balancer functions. The administrator deploys mature applications of different northbound controllers at the control layer to control the devices at the forwarding layer

In addition, even if the northbound controllers are the same, the network functions required by different forwarding layer devices are different, so the northbound controllers that control different forwarding layer devices also need to provide different applications.

In fact, network requests from the forwarding layer need to be processed by a variety of northbound controller applications. Therefore, it is difficult to directly connect the control layer and forwarding layer of SDN to meet this requirement, which requires the forwarding layer and the application of heterogeneous control layer It has the ability to implement OpenFlow message scheduling for different applications

[0005] On the other hand, due to the limited processing capability of a single northbound controller node, as the network scale of the access layer and forwarding layer expands, a single northbound controller will not be able to meet the processing performance requirements of the control layer, which requires the forwarding layer and application heterogeneity The northbound controllers can be flexibly deployed between the control layers of the SDN type, and it is difficult to meet this requirement when directly connected to the control layer and the forwarding layer of the SDN.

[0006] To sum up, there are defects in the control layer and forwarding layer architecture of SDN, and it is difficult to directly connect the control layer and forwarding layer of SDN to meet the needs of actual networks.

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