ANALYSIS OF BORDER GATEWAY PROTOCOL WITH VIRTUAL ROUTING AND FORWARDING INSTANCES USING GRAPHICAL NETWORK SIMULATOR

Abstract: In general routing protocols are classified as Interior gateway routing protocols and Exterior gateway routing protocols. IGP mainly suffers from link failure, inefficient bandwidth, slow convergence rate for larger networks, and requirement of larger memory. To overcome the drawbacks of IGP we are moving for EGP which consists of e-BGP. BGP is mainly used for supporting edge customer services such as exterior routing. For transporting VPNv4 services across the customer sites BGP is mostly preferred in MPLS VPN networks. By using MPLS VPN services in BGP, it provides consistent end-to-end connectivity for the customers. Since the same routing protocol is used between the customer and the service provider networks there is no need to use the concept of redistribution. Thus in this paper BGP peering with MPLS VPN environment is preferred in two different networks. The first method is BGP PE-CE VPN sites implementing unique AS numbers and the second method is BGP PE-CE VPN sites implementing same AS numbers. These methods can be implemented using Graphical Network Simulator3 software tool.

Keywords: IGP, EGP, BGP, MPLS, VPN, GNS3