The article deals with the analysis of models and algorithms of the system control SDN of architecture for providing of more quality work of network. Great diversity of most hardware implementation of the data devices SDN architecture leads to the fact that different switches may not support some features or support them with limited performance. In the process network, this can significantly affect the throughput of an individual data flow or whole network domains. Routing flow transfer is carried out by criterion of quality of service and the criterion of balanced loads of network resources the network. Improving the quality of service is subject to the classification of the flow that greatly restricts the ability of flow control. Most models of such networks do not take into account the characteristics of multi-service data flow, which leads to deterioration in the quality of service and increase the likelihood of blocking the channels of transmission network. The inability to implement differentiated management for individual data streams for individual clients and take them into account quality requirements, leads to low efficiency of channel routing, sub-optimal distribution of network load, the deterioration of the quality of service high-priority data streams. Tools control over the process of transmission of individual data flow do not exist, whereby the control system has the ability to determine service degradation for these data streams, and therefore will not be able to guarantee the necessary level of control. New models and algorithms of functioning of a software – managed network will allow for routing data streams of network, differentiating them according to the sensitivity to mixing of packet and connection drops. At created networks try to dissociate C-plane from the plane of transmission and put considerable efforts to overcoming of the nascent problems related to complications of migration from traditional networks to architecture of SDN. The aim of this article is realization of analysis of models and algorithms of functioning of control system of architecture of SDN for more reliable work of network. It gives possibility to the users to get services with necessary quality, by authenticity and will allow overcoming the nascent problems related to complications of migration from traditional networks to architecture of SDN.
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