Key Technology Research Of MPLS VPN & Its Design And Implementation In ACR

With the development of society, The demand Of end users for VPN (Virtual Private Network) has increased .As the access equipment at the core of NGN (next generation network), ACR (large-scale Access Convergence Router)shall provide a comprehensive set of VPN services for users. Because of BGP VPN in security, scalability, flexibility and so on the merits, ACR system has become the best way to provide users with VPN services. Based on the "large-scale Access Convergence Router (ACR) performance and key technology research",which is the state's 863 major projects planned in the field of information technology, in systemic function and key technologies ,the article further study the schemes of BGP VPN program in ACR system .As ACR-S needs to access lots of VPN end users, and the amount of interface is limited, the article points outs the schemes that it should divide the function of VPN completed by the collaboration of ACR-S and EMD. Thus it has settled the difficult problem of the realization of BGP/MPLS VPN for ACR. For the specific realization of BGP/MPLS VPN, the article gives out specific agreement flow design.Because ACR-S system transmit design include two part :MPLS basic transmit and BGP/MPLS VPN transmit, this article gives out the specific transmit process flow and the design of VRF, FTN, ILM. It also adjust the way of table look-up, and change the series look-up table method into parallel table look-up way. Thus it raises the efficiency of look-up table. As for the FTN, ILM table descended to the transmit plane, this article proposes the design idea of 3-layer mark. Therefore, it makes the VPN only need one time to look up table rather than use the recycled way.It test BGP\MPLSAVPN in ACR, and also gives out lots of test plan. Through out the test effect, it proves that the scheme of ACR can efficiently prompt the realization of BGP\MPLS VPN.