问题现象：

安装完操作系统后，插上光模块网口灯是亮的，通过ip a发现网口不能正常的UP，ipconfig无该网卡信息。如下所示：

通过ip a命令可以发现网口状态是down的
6: ens2f0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 0c:42:a1:a9:67:ce brd ff:ff:ff:ff:ff:ff
7: ens2f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 0c:42:a1:a9:67:cf brd ff:ff:ff:ff:ff:ff
8: ens8f0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 0c:42:a1:a9:76:26 brd ff:ff:ff:ff:ff:ff
9: ens8f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 0c:42:a1:a9:76:27 brd ff:ff:ff:ff:ff:ff


通过ifconfig，无法发现网口，通过ifconfig -a 可以看到网卡
bond0: flags=5187<UP,BROADCAST,RUNNING,MASTER,MULTICAST>  mtu 1500
        inet 172.10.10.74  netmask 255.255.255.0  broadcast 172.10.10.255
        inet6 fe80::8613:9fff:fe46:a1e  prefixlen 64  scopeid 0x20<link>
        inet6 2409:8c2f:3800::ac2:974a  prefixlen 120  scopeid 0x0<global>
        ether 84:13:9f:46:0a:1e  txqueuelen 1000  (Ethernet)
        RX packets 99044  bytes 27111363 (25.8 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3587  bytes 400961 (391.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eno3: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        ether 84:13:9f:46:0a:1e  txqueuelen 1000  (Ethernet)
        RX packets 79393  bytes 22447352 (21.4 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 3542  bytes 398519 (389.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

eno4: flags=6211<UP,BROADCAST,RUNNING,SLAVE,MULTICAST>  mtu 1500
        ether 84:13:9f:46:0a:1e  txqueuelen 1000  (Ethernet)
        RX packets 19651  bytes 4664011 (4.4 MiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 45  bytes 2442 (2.3 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 88  bytes 7920 (7.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 88  bytes 7920 (7.7 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

解决办法：

在linux中通过ifconfig命令将网卡手动开启一下

ifconfig ens2f0 up
ifconfig [网卡名称] up

开启后的网卡，通过ip a、ifconfig命令查看就正常了，很奇怪，难道这个网卡默认是关闭的，但是插线也亮呀。

再通过ip a查看网卡就UP了,ifconfig也可以发现看到了，也能正常转发数据了。
6: ens2f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 0c:42:a1:a9:67:ce brd ff:ff:ff:ff:ff:ff
    inet6 fe80::e42:a1ff:fea9:67ce/64 scope link 
       valid_lft forever preferred_lft forever
7: ens2f1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 0c:42:a1:a9:67:cf brd ff:ff:ff:ff:ff:ff
8: ens8f0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
    link/ether 0c:42:a1:a9:76:26 brd ff:ff:ff:ff:ff:ff
9: ens8f1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 0c:42:a1:a9:76:27 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::e42:a1ff:fea9:7627/64 scope link

网卡背面图：