SDN and NFV is the next phase of technology change which will help service provider to launch the services in single click. This is all about the programmability of the networks by using open source software defined network controller.
1. The simplest dynamic routing protocol for PE-CE. 2. Configuration done under vrf address family. 3. MED is used to carry rip metric which remains the same throughout the MPLSVPN cloud. 4. It avoids the routing loops.