A multi-controller wmsdn networking method

Abstract

The invention discloses a multi-controller wmSDN networking method. The steps include: a switch uses a wmSDN network protocol to discover a basic path and forward control flow, and the switch determines the forwarding path for data flow through a flow table issued by a controller; The controller obtains the status information of the entire wmSDN network by reading the wmSDN network protocol module in the directly connected switch, and elects one controller as the master controller, and the rest as slave controllers; The controller and the switch are partitioned; the master controller checks its own load status at any time. If the load of the master controller is too heavy, it will trigger the master election program, and re-elect the master controller among the slave controllers; the slave controller periodically Check the validity of the master controller, and trigger the master election procedure if the master controller is found to be invalid. The invention not only solves the disadvantage of a single controller well, but also solves the limitations of the current multi-controller networking mode.

Description

technical field [0001] The invention relates to the technical field of computer networks, in particular to a multi-controller wmSDN networking method. Background technique [0002] Wireless Mesh Network (WMN) is a new type of wireless broadband network, which has the characteristics of high capacity, good stability, flexible structure, and easy deployment. In terms of network topology, WMN network nodes have low mobility and few topology changes. At present, WMN is mostly used in access network and backhaul network. [0003] SDN is a new type of network architecture, which emphasizes the separation of the control plane and data plane of network equipment. The functions of the control plane are completely converged to the controller in the network to realize, such as the collection of network topology, the calculation of routing, and the flow table. Functions such as generation and distribution, network management and control; and data plane switches are only responsible for...

AI Technical Summary

Problems solved by technology

[0005] OpenFlow is a protocol specification to realize the communication between the controller and the switch in the SDN architecture. In the OpenFlow system, the controller method is simple to implement. Generally, the entire network is controlled by a single controller. Although a single controller brings convenience in control, However, there are the following problems when used in the wmSDN network: first, the control traffic flowing to a single controller will increase with the growth of the network size, and the bandwidth between the single controller and the switch is limited; second, when the network When the scale is large, the switches far away from the controller will suffer from a long delay in establishing the flow table, thereby greatly reducing the forwarding rate of the data plane; third, the performance of the entire system will be constrained by the processing power of a single controller, thus limiting The network scale increases; fourth, a single controller will make the entire network lack robustness, that is, when the controller fails due to link disconnection or other reasons, the entire network will collapse

[0006] At present, there are also some multi-controller networking methods, but these solutions have the following shortcomings: First, in the existing networking methods, the matching methods of controllers and switches are basically artificially matched, which is not flexible; Second, since all controllers in the multi-controller scheme need to have a consistent network-wide topology, a third-party storage medium is basically required to store the network-wide topology in existing methods, and correspondingly, the controller and the first Communication support between three-party storage media; third, in the existing method, communication between controllers needs to establish a separate channel for communication

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