Problem: use the ifconfig command under centos7 can't see the card information;

Solution: 1, using the ifconfig - a command to see whether display corresponding card information;

2, if show, because of the network adapter does not start, perform: ifup XXX (nic); Note: different system version command may differ, baidu itself;

3, if don't show, and the normal installation of the driver, try to execute the following command:
Rmmod ixgbe;
Modprobe ixgbe allow_unsupported_sfp=1;
Modprobe ixgbe;
4, if still do not show, then check if card is loose, drive is normal installation;