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.
A weird issue of VPDN was observed in c7200-js-mz.122-31.SB13.bin. The VPDN was working fine but during the new installation of ios in router make all the vpdn session down. Still not able to find the exact route cause analysis.