Study of boundary values of VPN traffic delays considering cross flows

Virtual private networks are one of the most popular services in next generation networks. When implemented in a network operator a large number of VPNs there is a conflict over the resources of the network. The paper proposes a VPN model based on Network Calculus theory, allowing to define the least upper delay bound for flow of planned VPN considering cross flow other VPNs in nested and non-nested tandems. Considered the results of a study of the proposed model. According to the results of experiments found that the greatest impact on the delay of the proposed VPN flow will have bursts of cross flows in medium and large batches route nodes. The rate competing flows will have a noticeable effect on the delay of the planned VPN flow at high loads routes nodes. Are given the recommendations for operators on the use of results in practice when planning a VPN. This model can be used as a basis for the development of specialized software package planning and allocation of network resources.