Implementation of Layer 3 Vpns over Layer 2 Vpn Topologies Using Gns3 Software

Abstract

To implement VPNs to connect geographically separated customer sites. VPNs were originally introduced to enable service providers to use common physical infrastructure to implement emulated point-to-point links between customer sites. A customer network implemented with any VPN technology would contain distinct regions under the customer's control called the customer sites connected to each other via the service provider network. The peer-to-peer model was developed to overcome the drawbacks of the Overlay model and provide customers with optimal data transport via the Service Provider backbone. Hence, the service provider would actively participate in customer Layer 3 routing. Customer Layer 3 routing information is carried between routers in the provider network and customer network. The peer-to-peer model, consequently, does not require the creation of virtual circuits. Layer 3 VPNs implemented on MPLS backbone of service providers are referred as “MPLS L3 VPNs”.