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Network slicing is an important technology that influences the way in which new networking solutions will be designed and operated. Currently, there are several approaches to network slicing, but so far there is no a systematic approach that includes all aspects of the technology. In this paper, we present a generic network slicing framework that includes embedded in each slice some management and operations related mechanisms in order to cope with slice management scalability and to address the multi-tenancy issue. The presented solution uses NFV MANO for slice orchestration and supports multi-domain slicing.