The Cisco 3800, 2800, 1800, 870, 3700, 2600, and 1700 Series provide Multi-VRF customer edge support. No tagging or label distribution is involved, but the physical router supports multiple VRFs. Recommended positioning limits for throughput and the number of VRFs scale from 2 Mbps and 2 VRFs on the Cisco 870 Series, and up to 45 Mbps and 25 VRFs on the Cisco 3845 Integrated Services Router.
The Cisco 3800, 2800, and 3700 Series; Cisco 2691 Multiservice Platform; and Cisco 1841 Integrated Service Router provide LER, LSR, and CSC customer edge Layer 3 IP VPN (L3VPN) support. The support is specific to low-end configurations, with positioning limits ranging from 4 Mbps, 10 VRFs, and 10 MPLS traffic engineering (TE) tunnel headends for the Cisco 2691, and up to 45 Mbps, 25 VRFs, and 25 MPLS traffic engineering tunnel headends for the Cisco 3845. The LER and LSR configurations are useful for self-deployed MPLS networks for the given limits, and the CSC customer edge configurations are useful for service-provider-managed MPLS networks.
Although the recommended limits in this document can be exceeded in scenarios in which no other features are running concurrently, Cisco Systems® has certified and established these design recommendations to help ensure that real-world design and use meet customer expectations. For applications requiring higher or more specific performance characteristics than those described in this document, please evaluate the Cisco 7200 and 7300 Series Routers. These platforms are designed and tested for provider edge and provider roles.
As taken from:-
http://www.catalyst.info/en/US/prod/collateral/iosswrel/ps6537/ps6557/prod_white_paper0900aecd8051fbdc.html
