centos网卡子接口配置（带vlan）

1.检查OS是否加载802.1q模块

[root@agent network-scripts]# modinfo 8021q
filename:       /lib/modules/5.4.200-1.el7.elrepo.x86_64/kernel/net/8021q/8021q.ko
version:        1.8
license:        GPL
alias:          rtnl-link-vlan
srcversion:     634123A919317BAF16A45A8
depends:        mrp,garp
retpoline:      Y
intree:         Y
name:           8021q
vermagic:       5.4.200-1.el7.elrepo.x86_64 SMP mod_unload modversions

2.如果没有加载如何加载802.1q模块

modprobe 8021q           ###加载模块
lsmod | grep 8021q          ##检查模块是否正常加载

3.父接口eth3随意配置，子接口eth3.1000如下配置

[root@agent network-scripts]# cat ifcfg-eth3.1000 
TYPE=vlan
PHYSDEV=eth3
BOOTPROTO=static
NAME=eth3.1000
DEVICE=eth3.1000
ONBOOT=yes
IPADDR=172.31.255.249
PREFIX=30
GATEWAY=172.31.255.250
VLAN=yes
VLAN_ID=1000

3.配置完后重启网络服务

service network restart

3.配置成功后可看到如下文件

[root@agent network-scripts]# ls /proc/net/vlan/
config  eth3.1000

[root@agent network-scripts]# cat /proc/net/vlan/config 
VLAN Dev name     | VLAN ID
Name-Type: VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD
eth3.1000      | 1000  | eth3

[root@agent network-scripts]# cat /proc/net/vlan/eth3.1000 
eth3.1000  VID: 1000     REORDER_HDR: 1  dev->priv_flags: 1021
         total frames received        12258
          total bytes received      4891918
      Broadcast/Multicast Rcvd            0

      total frames transmitted         7825
       total bytes transmitted       821754
Device: eth3
INGRESS priority mappings: 0:0  1:0  2:0  3:0  4:0  5:0  6:0 7:0
 EGRESS priority mappings: