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Network virtualization is a method of providing virtual instances of physical networks. Virtualized networks are widely used with virtualized servers, forming a powerful dynamically reconfigurable platform. In this paper we discuss the impact of network virtualization on the overall system availability. We describe a system reflecting the network architecture usually deployed in today's data centres. The proposed system is modelled using Markov chains and fault trees. We compare thedoi:10.15598/aeee.v11i5.905 fatcat:js5uf3r4v5g7lppcozztaztqda