This white paper compares MPLS- and IPSec-based VPN architectures. It begins by explaining the evolution of the two distinct VPN technologies, and the general goals for VPN architectures. Next, it presents the relative strengths of MPLS- and IPSec-based VPNs and explains where service providers can deploy each architecture for optimum advantage. The white paper concludes with a brief description of the integrated IPSec-to-MPLS VPN solution from Cisco Systems, which takes advantage of the respective strengths of the two architectures.
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