This article briefly looks back to the development of VPN and provides classification and theory of VPN. It focuses on layer 2 VPN, describing model of layer 2 VPN, discussing implementation of layer 2 VPN using VPLS on Huawei Technologies' Radium 8750. Then, according to RFC2547bis, the author gives out a theoretical model of MPLS/BGP layer 2 VPN which is the future evolving direction of 8750.
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