VRF/RT-based Discovery of VPN Topology in BGP/MPLS VPNs
基于VRF和RT实现BGP／MPLS VPNs中的VPN拓扑发现

BGP/MPLS VPNs defined in RFC 2547 allow service providers to use their IP backbone to provide VPN services.BGP is used to distribute VPN routing information to the routers in the backbone network and MPLS is used to forward VPN traffic.BGP/MPLS VPNs allow service providers to define any arbitrary topology with any number of nodes in a VPN.The service provider can create multiple VPNs using the same core network.Currently most of the service providers track 2547 VPNs either manually or by using a provisioning database.Algorithms described in this paper aims at automating this VPN discovery procedure.Using our algorithms,service providers can automatically discover VPN topology that has already been configured using the current network configuration information.