Virtual Private Networks (VPNs) have been a key application in networking for a long time. Driving this need has been the requirement for secure transport of sensitive information, controlling information access to those who need it, etc. In large enterprises, particularly those distributed across disparate locations, sensitivity to information pertinent to a department drives the requirement for an IT manager to logically demarcate information flows to be within that department. The need for privacy is another driver behind deployment of VPN solutions.
Multi-VRF provides a reliable mechanism for trusted VPNs to be built over a shared infrastructure. The ability to maintain multiple virtual routing/forwarding tables allows overlapping private IP addresses to be maintained across VPNs and accomplish goals very similar to those of more complex VPN technologies such as BGP/MPLS VPNs.
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