This white paper compares MPLS- and IPSec-based L3VPN architectures. It begins by exploring the L3VPN mechanisms developed by the IETF and summarizing the general objectives of VPNs. Next it presents the relative strengths of MPLS- and IPSec-based VPNs and explains how service providers can use both architectures for optimum advantage. The white paper concludes with a brief description of the range of VPN infrastructure solutions available from Cisco Systems: the Cisco Network-Based MPLS VPN solution, the Cisco IPSec CPE VPN solution, and the Cisco Network-Based IPSec VPN solution, which combines MPLS-based and IPSec-based technologies.
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