On Layered VPN Architecture for Enabling User-Based Multiply Associated VPNs

This paper proposes a layered VPN architecture for realizing user-based multiply associated VPN. This layered VPN architecture consists of three network levels such as PNL (Physical Network Level), LNL (Logical Network Level), and UNL (User Network Level). First, the paper discusses and classifies functions required for each network level. Then it present several approaches for implementing each network level using existing layer 2, 3, and 4 networking technologies, and quantitatively evaluate their advantages and disadvantages from several viewpoints including scalability and transmission speed.