Problem with igb NIC on fresh 11 Install

[Lee Brown]

Hi,

I've been using FreeBSD for years, so I'm familiar with the setup.

I just got a server, supermicro motherboard, 4 intel NICs, installed the
FreeBSD-11.1-RELEASE-amd64-disc1.  uname reports FreeBSD11.1-RELEASE #0
321309.

Unfortunately the igb NIC's don't appear to work correctly.  With no VLAN
igb0 and igb3 (the only two I tried) will transmit packets but not receive
them (switch sees the MAC, destination host sees packet).  If I turn on
VLAN, then nothing is transmitted either (the switch never sees a MAC
address on the port).

I've certified two cables, neither makes a difference.

Occasionally the ports don't detect the cable has been removed and still
reads active instead of no carrier.

Feels like a driver problem....any clues?  Tomorrow I'll try a direct cable
into a laptop, then failing that I suppose I'll svn the latest 11.1 source
and start building a new world.

Appreciate any help folk can provide -- lee