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MPLS and VPN Architectures, Volume II by Jeff Apcar, Ivan Pepelnjak, Jim Guichard

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MPLS-Based VPNs

MPLS-based VPN technology uses a combination of connection-oriented and connectionless VPN technologies, including the following features:

  • The interface between the CE routers and the PE routers is connectionless. No additional configuration is needed on the CE devices.

  • The PE routers use a modified IP forwarding paradigm; a distinct IP routing and forwarding table (called virtual routing and forwarding table, or VRF) is created for each customer.

  • The customer's addresses are extended with 64-bit route distinguishers to make nonunique 32-bit IP addresses globally unique within the service providers' backbone. The resulting 96-bit addresses are called VPNv4 addresses.

  • A single routing protocol is run between the PE routers for all ...

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