Problems

The VRF routing table lookup introduces the following complication.

The size of the Internet routing table. Placing a full default-free Internet routing table in the VRF routing table is not feasible because it does not scale. The PE router would have to support more than 100,000,000 routes, because the full default-free Internet routing table is currently about 120,000 routes and the router must support up to 1,000 VRFs.