Since this issue is related to the Preboot Execution Environment (PXE) boot, we would appreciate if you could re-post your inquiry here:
We have encounter this same issue on the Dell Optiplex 790 and the 4500e switch family. We have support calls open with Dell and Cisco.... I was hoping maybe we could get some Intel help out here.
We are a VoIP shop so turning off POE is not an option for us. We are a Cisco heavy network and have 1300 of these Dells ordered. Wow.. never dreamed this would be a problem.
We don't have the resources to manage our edge devices on a port by port basis. THIS IS A HUGE PROBLEM!!
If you wish to troubleshoot this problem directly with Intel, please feel free to contact our support department:
Optiplex 990 BIOS A06 has fixed this issue.