Virtual Private Networks (VPNs) provide a highly secure way for customers to share bandwidth over an ISP backbone network. A VPN is a collection of sites sharing a common routing table. A customer site is connected to the service provider network by one or more interfaces, and the service provider associates each interface with a VPN routing table. A VPN routing table is called a VPN routing/forwarding (VRF) table. VRFs are generally associated with MPLS based VPNs.
With the VRF-lite feature, multiple VPN routing/forwarding instances can be supported in customer edge devices. VRF-lite extends limited PE functionality to a CE device, giving it the ability to maintain separate VRF tables to extend the privacy and security of a VPN to the branch office. This also helps the customer to share the same CE for various internal departments while maintaining separate VRF table for each department.
Now, the intention of this document is to enable Cisco IOS GET VPN on the CE's VRF-lite interfaces. Cisco IOS GET VPN is well documented at http://www.cisco.com/go/getvpn.
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