Network Scenario using Cisco 891 and VRF Lite Consider the scenario depicted on the diagram above.
MPLS FUNDAMENTALS LUC DE GHEIN PDF HOW TO
To demonstrate how to use this feature lets see the following simplified scenario: Each routing table (VRF instance) is isolated from the other VRF instances. With VRF Lite, you can have separate routing tables on the same physical router device. Now, although VRFs and MPLS are usually configured on high-end ISP routers, you can still use this feature on some smaller Cisco ISR routers in a simplified manner called VRF Lite and have the same advantages. If you want to read about this technology, one good book to start with is MPLS Fundamentals wrote by Luc De Ghein. They are discussed in the chapters needed for your CCIE R&S certification. Also, from what I know, MPLS and VRFs are not examined at the CCNA or CCNP R&S level. If you dont work in an ISP environment you will not encounter this technology.
Each VRF is like a separate virtual router with its own routing table on the same physical router. Consider a VRF as a separate routing instance (and separate routing table) on the same device holding the IP routes for each customer which are isolated from the other customers. VRF (Virtual Routing and Forwarding) is traditionally associated with IP MPLS technology whereby an ISP creates Layer3 (or Layer2) VPNs for customers using VRF. What is VRF Lite VRFs employ essentially the same concept as VLANs and Trunking, but at Layer3. In this tutorial, we will discuss traffic isolation at Layer3 level using VRF Lite on Cisco routers. Cisco VRF Lite Configuration In the previous post, we have discussed about isolating traffic using the private VLAN feature at Layer2 level.