Abstract
Enterprises and private companies often use virtual private networks to communicate with remote sites. Traditionally, asynchronous mode core networks have been used before. (Level 2 Frame Relay), ie time division multiplexed private lines. Today, there is an increased demand for service providers to consolidate and reduce costs in the context of a highly dynamic telecommunications market. The need requires increasing revenues from their own IP network infrastructure through new capabilities: such as IP Virtual Private Networks, Virtual Private LAN services, to achieve operational efficiency through the convergence of multi-protocol switching according to all their characteristics. The new urban networking technology Ethernet can be used in combination with asynchronous transmission mode and frame relay access to provide these new services to corporate users. This should be achieved while also supporting existing technologies, such as asynchronous transmission mode, which continue to provide highly profitable services. The technical challenges discussed in the paper are met by converged features In a multi-protocol switching network, as a traditional layer 2 services, as well as new level 3 service delivery requirements. The need for network and service interconnection is shown in terms of how they should work at the user, control and management levels to provide smooth services in the new converged network. Various solutions defined by standards bodies are described and individual scenarios are explained.