Analytical model of corporate software- controlled SDN network switch

Implementing the almost limitless possibilities of a software-controlled network requires additional study of its infrastructure level and assessment of the telecommunications aspect. Therefore the aim of this study is to develop an analytical model for analyzing the main quality indicators of network switches and communication channels. To form a mathematical model of the switch for software-controlled network operating in a stationary mode and serving the requests of variable volume, it is proposed to use the queuing system theory, as well as the apparatus of semi-Markov processes. The switch model is formally presented as an open queuing network with Poisson fow of incoming packets, refusals and blockings. The frst stage of servicing requests includes the processes of writing network packets to the switch multiline bufer memory. In the next center the correspondence of incoming packet address to the records in the fow tables is being checked. The third single-line center implementing the transmission process of the packets leaving the switch can be described by a system with independent single-line queuing systems with n-place bufers. Dependencies of queuing time and service time of incoming network packets on load are obtained, as well as equations for fnding the volume of a switch bufer memory with acceptable probability for message loss, the quality indicators of its transmitting part.