Simulation and analysis models of hybrid software­configured devices

Abstract

The analysis of the algorithm, based on which the simulation and analytical model of the hybrid software-configurable device is automatically synthesized, was carried out. The solution for modeling OpenFlow equipment was also considered, and an original OpenFlow switch model was developed, which is distinguished by the ability to manage delays based on the results of its mathematical model. The operation scheme of a hybrid switch that supports both traditional switching and OpenFlow switching has been developed. This scheme allows solving complex tasks in the physical infrastructure of virtualized networks. A module has been developed to create a realistic delay and limit the capacity and performance of the hybrid switch model, which can work according to the data obtained as a result of the experimental study. Additional traffic processing schemes have been developed for a more detailed implementation of the hybrid software-configurable equipment model. The basic model of the switch presented in the INET OMNeT++ framework is considered. The switch is represented by a set of modules interacting through the OMNeT transmission system. The most detailed modules of Ethernet interfaces are implemented, in particular, there are implementations of the input queue of the Tail-Drop type, output queues of the FIFO, RED, WRED, PQ, CBFQ types, as well as the implementation of the transmission delay on the line. The virtualization technology of network functions, which is built on the basis of software-configured networks, has been studied, and the most popular Linux-based solutions are used as a software-controlled Open vSwitch switch. The considered methods of forming a model of such a switch. Open vSwitch is architecturally different from both classical and OpenFlow real switches, as there are no dedicated packet refactoring units (except for network cards with hardware header processing and FPGAs), dedicated memory and processors for switching, Open vSwitch uses a kernel module (or module DPDK for direct transmission without the participation of the kernel) to transmit packets based on information from the OVSDB database or OpenFlow tables.