There’s been a ton of recent vendor activity in and around the enterprise WAN. For starters, there are several start-ups emerging like Glue Networks, Viptela, CloudGenix and Velocloud. Further, Cisco announced a bunch of new hardware/software in conjunction with their IWAN architecture at Interop in the Fall, including a much-needed revamp of their path selection software (PfR). Silver Peak launched their Unity software architecture late last summer, which is essentially an IPSec-based SDN overlay that runs over the Internet and uses “cloud intelligence” to pump information back into the forwarding decision. In addition, Nuage Networks (a spin-in from Alcatel-Lucent) recently extended their data center overlay solution to the WAN as well.