from ccie r&s…
To support multiple customers, MPLS VPN standards include the concept of a virtual router. This
feature, called a VRF table, can be used to store routes separately for different customer VPNs.
The use of separate tables solves part of the problems of preventing one customer’s packets from
leaking into another customer’s network due to overlapping prefixes, while allowing all sites in the
same customer VPN to communicate.