3. Juniper Networks

Juniper Networks accounted for 4.8 percent of the total units shipped in 2014, rising 0.8 points from 4 percent in 2013.

In early December, Juniper unveiled a new data center switch, OCX1100, designed to run either on Juniper's own Junos network operating system or third-party software. The Sunnyvale, Calif.-based company said OCX1100 was the first switch in the industry to mix Open Compute Project hardware -- a consortium that applies open-source principles to make data center hardware design more efficient -- with legacy vendor software like Junos.