SDN based distributed control system and user flow optimization method

Abstract

The invention reveals an SDN based distributed control system and a user flow optimization method. The distributed control system comprises multiple layered controllers; the controllers include root controllers at the top layer, area controllers in the middle layer and access controllers at the bottom layer; the SDN comprises multiple areas; each area comprises the area controller in communication connection with the root controller, the access controllers in communication connection with the area controller and first SDN switches in communication connection with the access controllers; and the root controllers are used for global control, the area controllers are used for area control, the access controllers are used for data access, and the first SDN switches are used to forward data packets by inquiring local flows.

Description

technical field [0001] The invention relates to a controller of an SDN network, in particular to a distributed control system based on the SDN network. Background technique [0002] The SDN network consists of an SDN switch and a controller. The SDN switch is responsible for the forwarding of data packets, and the controller is responsible for the data control plane. The SDN switch and the controller use the openflow protocol for communication. [0003] As a prototype implementation of SDN, OpenFlow technology represents the technical realization of the SDN control-forwarding separation architecture. With the gradual development and improvement of SDN technology, strictly speaking, OpenFlow technology has become one of the various communication protocols between the SDN control plane and the data plane, but in fact, OpenFlow has been regarded as an SDN protocol because of its flexibility and standardization advantages. The standard of the communication protocol is similar t...

AI Technical Summary

Problems solved by technology

[0009] However, the current controller of the SDN network is generally deployed in the local area network. If the controller is used on the wide area network, there will be situations where the flow table delivery fails or even cannot be connected.

Specifically, the current controller and SDN switch are connected through the Internet. For example, SDN switches are distributed all over the world, and there is only one controller. No matter which address the controller chooses, there will be links from the controller to some SDN switches. In the case of poor quality, for these links with poor quality, the package-in message generated by the SDN switch needs to be transmitted to the controller after hundreds of milliseconds. The controller performs path calculation and then sends the flow table down. , when the network packet loss is serious, it will cause the packet-in message or the data packet of the distributed flow table to be lost

The SDN switch will continuously generate package-in messages because it has not received the delivered flow table, which will consume a large amount of network resources between the controller and the SDN switch, and further affect the communication between other SDN switches and the controller. In extreme cases It may happen that the controller cannot respond in time to the normal package-in messages of other SDN switches, resulting in users being unable to communicate.

[0010] In addition, in the current SDN network, because a single controller has network resource bottlenecks, cpu computing bottlenecks, and storage bottlenecks, etc., these will affect the concurrent processing capabilities of the controllers, resulting in limited concurrent processing capabilities of a single controller. The matching speed and entries are limited, so it is not suitable for use in the case of large data volume and high concurrency

[0011] Moreover, when there is a problem with a single controller, the newly generated traffic of users in the network cannot be scheduled normally, resulting in the interruption of user access services, and the dual-machine hot backup sometimes interrupts the user's business when switching , which affects the use of the entire network

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