The Research And Application Of IP VPN

IP VPN(Virtual Private Network) make use of IP facility (including INTERNET or IP backbone network ) to realize private service simulation in(Wide Area Network) WAN(including Long-distance Dial-up or Digital Data Network). IP VPN establish private data-transmission tunnel through INTERNET. VPN technology provide the second-layer and the third-layer interconnections for enterprises. Physical private network is secure, but it is expensive.VPN is a very good solution. In North America and Europe, VPN already was a quite common service. In the Asian and Pacific area, this service also grow rapidly .In domestic markets , telecommunication business start to provide VPN service in order to keep ahead in the new competition .VPN begin in the 90's, have obtained fruitful progeny all over the world, and gradually formed systemic theory, established it's status in the network theory, and come to maturity after 20 years development. But the technology has an inadequacy to deal with fault because service provider and enterprises network is very frangible, especially network breaks down not easy to restore.It has brought destruction to the maintenance. Traditional private line service don't fit in with the development because of expensive rent and consumer intricacy .This paper research mainly design method of IP VPN technology and explore the feasibility and practical meaning of implementing VPN in Hunan telecommunication broadband IP network by utilizing IP VPN technology.This paper study the cause of VPLS(Virtual Private LAN Service) loop fault in detail ,and then introduces a method of solving VPLS loop fault . the paper make some feasible suggestion of VPLS network maintenance,VPLS loop fault avoider and broadcast storm restrainability. Fault diagnosis is very accurate by practice result. The method was practical and feasible reduced the partial failure to the entire network influence.This paper research the VPDN(Virtual Private Dialup Network) technology principle particularly and expatiate on Hunan VPDN realization including the LNS,the service realization and the VPDN service maintenance.This paper research E-VPN based on IPSec(IPSecurity) technology deeply and expatiate on Hunan E-VPN realization. The paper draw a comparison between E-VPN to the other VPN technology, finally indicate that E-VPN is more flexible and convenient. In the end, this paper research the performance index of IP VPN.The whole performance test for IP VPN prove the realization of implementing VPN in Hunan telecommunicatio broadband IP network by utilizing IP VPN technology.