[root@qt ~]# lsusb -t
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
|__ Port 1: Dev 4, If 0, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 4, If 1, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 4, If 2, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 4, If 3, Class=Vendor Specific Class, Driver=option, 480M
|__ Port 1: Dev 4, If 4, Class=Communications, Driver=cdc_ether, 480M
|__ Port 1: Dev 4, If 5, Class=CDC Data, Driver=cdc_ether, 480M
|__ Port 2: Dev 3, If 0, Class=Hub, Driver=hub/4p, 480M
能识别网卡，但状态一直是down的，ifconfig 和 ip link命令都无法配置为up
17: enp0s21u1i4: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
link/ether 12:e0:7b:33:10:54 brd ff:ff:ff:ff:ff:ff