PE--E1--CE(with 2-5 VRFs)--E1--C_router(with 2-5 VRFs)
I know 2 main solutions for subject:
1. GRE tunnels over E1 between PE-CE-C_router
2. Frame relay over E1 between PE-CE-C_router (IMHO MultiVRF-VRF-lite is FR approach)
What most preferred solution from the point of view of Cisco and why ?
Is it possible another solutions?