How do I configure FRR/bgpd to support RFC 4364 (BGP/MPLS) L3-VPNs?

Specifically, I’d like to know how to configure following things:

- One or more VRFs along with its import and export route targets as well as route-distinguisher.

o Specifying one or more neighbors (eBGP sessions) in this VRF with IPv4(|6) address family.

- One or more iBGP sessions with route-reflectors and other routers supporting VPNv4(|6) address family.

thx

aman