On Tue, 29 Nov 2016 09:06:00 +0000 TJ Trout <tj@pcguys.us> wrote:

Could this be MTU? I've tried flow control, hard code duplex, stp on/off etc I'm at a loss any ideas?

This sounds like a common problem that certain data center environments run into with 10 Gb/s and higher loads. In a nutshell, a simple throw money at it solution to the problem is to use a switch with larger buffers. Nonetheless, there are plenty of good sources of material about the phenomenon, such as: <http://fasterdata.es.net/network-tuning/router-switch-buffer-size-issues/> <https://people.ucsc.edu/~warner/buffer.html> John