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Layer 2 VPN Architectures by Anthony Chan, Dmitry Bokotey, Carlos Pignataro, Wei Luo

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Introduction

Until recently, the VPN landscape has been quite complex as service providers have struggled with how best to accommodate traditional access technologies (such as, dial, Frame Relay, and ATM) along with new ones (like, Ethernet and wireless) and Layer 3 VPNs over a common network infrastructure. A new solution, enabling service providers to converge Layer 2 and Layer 3 services and provide legacy data services over an IP or MPLS backbone, promises to simplify matters, benefiting both service providers and enterprises.

The historical disconnect between legacy Layer 2 and Layer 3 VPN solutions has forced service providers to build, operate, and maintain separate infrastructures to accommodate various VPN access technologies. However, ...

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