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5: MPLS Layer 3 VPN Migrations > 5.1 Motivations for Layer 3 VPN Migrations

5.1 Motivations for Layer 3 VPN Migrations

As L3 VPNs became more and more popular, the need to interconnect and integrate them soon arose. Ever since [RFC2547], the need to design interconnect mechanisms with protocol artifacts became clear: L3VPNs needed to span beyond a single service provider to be even more effective than a legacy network. Imagine the operational and installation costs for a multinational enterprise network being expanded across countries and continents, and compare them with a L3VPN interconnected across service providers in different regions that reuse their infrastructure to offer another VRF termination! Looking at this, how many corporate customers have major service providers gained over the last years based on this architecture?


  

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