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Magistrsko delo zajema kratek opis konceptov in arhitekture programsko določenih omrežij. Sledita opis porazdeljene izvedbe krmilne ravnine in predstavitev glavnih pristopov zagotavljanja skladnosti v omrežjih s tako ravnino. Magistrsko delo se osredotoča na zagotavljanje skladnosti v omrežjih s krmilniki ONOS. Namen je predstavitev delovanja teh krmilnikov v grozdu in način zagotavljanja skladnosti njihovih informacij o topologiji omrežja. Delovanje grozda smo preizkusili v različnih scenarijih v navideznih omrežjih, tvorjenih z emulatorjem Mininet. This master's thesis first gives a brief description of the concepts and architecture of software defined networks. A description of the distributed control plane and a presentation of the main approaches to ensuring consistency in networks with such a plane follow. The master's thesis focuses on ensuring consistency in distributed software-defined networks with ONOS controllers. The operation of these controllers in the cluster and the way of ensuring consistency of their information on the network topology are presented. The cluster performance was tested in various scenarios in virtual networks created with Mininet emulator.