By 2021 it is expected a little less than 90% of enterprise gateways must support virtual services. The reasons for the world to turn to virtualization (and software defined networks) are to increase service velocity and going from designing custom hardware and software to writing code that can be tested and run in a Virtual Machine. Capex and Opex reduction, going from having many diverse custom systems to fewer homogenous COTS systems, have more scalability and elasticity since the customer will be able to scale up and down the systems, add service nodes and instantiate more VMs by demand.