ity, virtual private networks, and software defined-WAN (SD-WAN) networks, there will be many millions of packet processors available that are ideally part of a broad fungible pool of resources. This leads to the notion of hybrid architectures where a combination of distributed controllers with centralized assist, can continually optimize packet flows across the pool of packet processors that are parameterized by a small set of differentiating features such as throughput, buffers, and logical table sizes. The most powerful application of such control will be for resiliency and restoration where lower reliability components (two or three 9s unit availability) are combined into a pool of resources to enable restorations both locally and across geographies to provide end-to-end services with high reliability (five or six 9s of availability). For the same reason that domain-specific languages have been created for programming packet pipelines, we believe that creation of open domain-specific languages with high level of abstraction for closed-loop control of packet processors will be a fruitful and essential evolution of packet edge technologies to address these use cases. REFERENCES Bosshart, P. et al.; P4: Programming protocol-independent packet processors; ACM SIGCOMM Computer Communication Review; Vol. 44, No. 3, 88-95, July 2014. Clos, C. A study of non-blocking switching networks; Bell System Technical Journal; 32, No. 2, 406-424, March 1953. Kodeboyina, C.; An open-source P4 switch with SAI support; 2015 (http://p4.org/p4/an-open-source-p4 -switch-with-sai-support/). Kreutz, D. et al.; Software-defined networking: A comprehensive survey; Proceedings of the IEEE; Vol. 103, No. 1, 14-76, January 2015. Lemos, R.; Internet routers hitting 512K limit, some become unreliable; Ars Techica, August 13, 2014 (https:// arstechnica.com/security/2014/08/internet-routers-hitting-512k-limit-some-become-unreliable/). Making the Switch; Disruptive Telecom White Box Collaboration Accelerates and Opens the Platform, Powering Unp