IP based VPN with Mobility Support in MPLS Network Environment

In this paper, we describe a mechanism that supports mobility service for VPN(Virtual Private Network) users on the MPLS(Multiprotocol Label Switching) network. The MPLS VPN considered in this study is based on CE(Customer Edge) routers. In such a VPN, CE routers have additional functions (Home Agent, Foreign Agent, Correspondent Agent) to support mobile VPN users. This mechanism applies when a mobile node moves to other site of the same VPN, or to other site of a different VPN, or to a non-VPN site. We perform a simulation study to compare the performance of CE based MPLS VPN with that of PE(Provider Edge) based MPLS VPN with mobility support.