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 don’t work in an ISP environment you will not encounter this technology very often. VRF (Virtual Routing and Forwarding) is traditionally associated with IP MPLS technology whereby an ISP creates Layer3 (or Layer2) VPNs for customers using VRF.Ĭonsider a VRF as a separate routing instance (and separate routing table) on the same network device holding the IP routes for each customer which are isolated from the other customers.Įach VRF is like a separate virtual router with its own routing table on the same physical router. VRFs employ essentially the same concept as VLANs and Trunking, but at Layer 3. In this tutorial, we will discuss traffic isolation at Layer3 level using VRF Lite on Cisco routers. In the previous post, we have discussed about isolating traffic using the private VLAN feature at Layer2 level.
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