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Implementing Cisco Networking Solutions by Harpreet Singh

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VRF-Lite

Sometimes layer 3 VPNs are also created within organizations by creating multiple routing tables within a single router. This is done by using a feature in Cisco IOS called VRF-Lite, where VRF stands for Virtual Routing and Forwarding. This is done to create small routing domains within an enterprise, where two LAN networks need to be isolated from each other, and the routing should happen only with a device at a higher layer.

Let us consider the topology in the following figure. We have two different entities, A and B, with separate networks in parts of the networks. However, the servers for the two entities are co-located and are terminated on the same router. If we don't do any specific configurations for isolating the networks, ...

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