The problems of reliability assurance for software defined networks
The main problems of reliability assurance for Software Defined Networks (SDN) are formulated; equipment and system aspects of reliability are identified. The key role of SDN-controllers in the functioning of the network is specified, the influence of their virtualization on reliability is considered. The modification of the controller placement problem, which allows carrying out optimization from the reliability point of view, is proposed. The results of reliability calculations for a typical example demonstrate the necessity for network redundancy of controllers and their connections with switches.