~ # esxcli network nic list
Name PCI Device Driver Link Speed Duplex MAC Address MTU Description
------------ ------------- ------- ---- ----- ------ ----------------- ---- --------------------------------------------------
vmnic0 0000:001:00.0 igb Up 1000 Full 00:a0:d1:ec:a7:dc 1500 Intel Corporation 82576 Gigabit Network Connection
vmnic1 0000:001:00.1 igb Down 0 Half 00:a0:d1:ec:a7:dd 1500 Intel Corporation 82576 Gigabit Network Connection
vmnic1000202 0000:004:00.0 mlx4_en Down 0 Half 00:02:c9:9f:55:b1 1500 Mellanox Technologies MT27500 Family [ConnectX-3]
vmnic2 0000:004:00.0 mlx4_en Up 10000 Full 00:02:c9:9f:55:b0 9000 Mellanox Technologies MT27500 Family [ConnectX-3]
As an aside note, are the Mellanox EN drivers bundled in the ESX 5.5 install newer/better than the download links for 1.6.1?