the command dladm show-phys not present SPEED or DUPLEX data for ixgbe interfaces
LINK MEDIA STATE SPEED DUPLEX DEVICE
net8 Ethernet down 0 unknown ixgbe0
net9 Ethernet down 0 unknown ixgbe1
net10 Ethernet down 0 unknown ixgbe2
net11 Ethernet down 0 unknown ixgbe3