It's mainly cost savings due to the simplicity of 25gbps ethernet vs 40gbps. This article has a good run-down: http://searchnetworking.techtarget.com/feature/25

It's mainly cost savings due to the simplicity of 25gbps ethernet vs 40gbps. This article has a good run-down: http://searchnetworking.techtarget.com/feature/25-Gigabit-Ethernet-Why-that-why-now-and-whats-next http://searchnetworking.techtarget.com/feature/25-Gigabit-Et...