Did you know that whenever you use Virtual Routing and Forwarding (VRF) tables in your network (be it on routers or on high-end switches), you’re actually benefitting from one of the MPLS/VPN technologies – VRFs were first introduced by Cisco to support the MPLS/VPN technology.
VRFs are pretty common in enterprise networks; the first half of my Enterprise MPLS/VPN Deployment webinar (register here) thus deals with VRFs, Multi-VRF (also known as VRF-Lite) and all sorts of VRF services, including VRF-aware NAT, per-VRF DHCP pools and interesting combinations of VRFs and GRE tunnels. Here’s the part where I explain what VRFs are as compared to VLANs:
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nice post Ivan, the biggest bugbear I find with VRF's is the lack of feature support, or if a feature is vrf-aware, it's only vrf-aware on a limited set of platforms.
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