We have implemented the MPLS/BGP VPNs in such a way that the features of layer 3 as scalability and intelligence are merged with the efficiency of layer 2 to cope up with almost all modern demands of speed, scalability and security. The proposed MPLS/BGP VPN design is implemented in Dynagen simulator (Dynagen, 2007) for easily understanding the system. Dynagen simulator is easily available and supports variety of network designs. In the proposed system five routers are used in which two routers belong to customer network and the rest belong to MPLS core network. BGP is used for route advertisement. After creating MPLS core testing is performed on customer routers which meet stated requirements. The proposed system MPLS/BGP VPN in a network core is implemented using Dynagen simulator in which the network topology consists of five routers that are as follows (also shown in Figure 1):
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