I ran into this this week – believe it or not, the 3-minute power off was what fixed it (mostly) though I did not fully disconnect it from the power source (which I will do next)

VMware ESXi 4.1 show’s Intel 82576 Gigabit NIC on Cisco UCS C210 M2 as 10Mbps Full - originally seen <a href="http://terenceluk.blogspot.com/2011/01/vmware-esxi-41-shows-intel-82576.html">here</a> - (Thanks!)

In my case, one nic negotiated 100 Full, the other to 100 Half – then after the firmware update, one went to 10 Full, the other went to 10 Half – then after the power off for 3 minutes, one went to 1000 Full, but the other is at 100 Full.  Both are set to autonegotiate, and yes, I checked the switch port settings too...

Next step is to fully disconnect the power from the power supplies – but since this one is sitting more than 3 hours away I have to gently “fiddle” with the APC PDUs to find which port the power supplies are plugged into so I can administratively “shut it” - keep your fingers crossed...

