VRF/MPLS on Linux

While I have found some information on a project called linux-mpls I am having a hard time finding any solid VRF framework for Linux. I have a monitoring system that needs check devices that sit in overlapping private ip space, and I was wondering if there is anyway I could use some kind or VRF type solution that would allow me to label the "site" the traffic is intended for. The upstream router supports VRF/MPLS, but I need to know how I can get the server to label the traffic. I would appreciate any input. --- Brian Raaen Network Architect braaen@zcorum.com