CentOS 7 網卡子接口的創建

轉自：https://www.cnblogs.com/horizonli/p/6093540.html

OS:CentOS 7

在linux上創建vlan需要加載802.1q模塊：

1.檢測OS是否已經加載802.1q模塊

 

 

[root@controller ~]# modinfo 8021q
filename:       /lib/modules/3.10.0-229.14.1.el7.x86_64/kernel/net/8021q/8021q.ko
version:        1.8
license:        GPL
alias:          rtnl-link-vlan
rhelversion:    7.1
srcversion:     2C3C3989B54002FAEC13FFD
depends:        mrp,garp
intree:         Y
vermagic:       3.10.0-229.14.1.el7.x86_64 SMP mod_unload modversions
signer:         CentOS Linux kernel signing key
sig_key:        E9:9F:C4:37:BD:9C:BF:B4:F1:B1:DA:87:C1:57:FF:66:56:9B:EE:66
sig_hashalgo:   sha256或者：[root@controller ~]# modinfo -F filename 8021q

 

 

/lib/modules/3.10.0-229.14.1.el7.x86_64/kernel/net/8021q/8021q.ko

 

或者：

 

[root@controller ~]# modprobe --first-time 8021q
modprobe: ERROR: could not insert '8021q': Module already in kernel

 

2.如果沒有加載802.1q模塊怎么加載？

 

##加載8021q模塊
[root@controller ~]# modprobe 8021q<br>##查看是否正常加載

　[root@controller ~]# lsmod |grep 8021q
　　8021q 28808 0 
　　garp 14384 1 8021q
　　mrp 18542 1 8021q

 

3.在父接口創建vlan子接口

　3.1在父接口/etc/sysconfig/network-scripts/ifcfg-ethX  中設置　

 

 

DEVICE=ethX
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes

 

 

 

3.2復制父接口並修改接口名稱

 

 

cp /etc/sysconfig/network-scripts/ifcfg-ethX /etc/sysconfig/network-scripts/ifcfg-ethX.125     ## X后面的125為vlan號

 

 

3.3配置/etc/sysconfig/network-scripts/ifcfg-ethX.125

 

DEVICE=ethX.192
BOOTPROTO=none
ONBOOT=yes
IPADDR=192.168.1.1
PREFIX=24
NETWORK=192.168.1.0
VLAN=yes                ##開啟vlan，表明此子接口為vlan接口

4.重啟網絡

 

systemctl restart network

 

 

================================================

CONFIGURE 802.1Q VLAN TAGGING USING THE COMMAND LINE

In Red Hat Enterprise Linux 7, the  8021q module is loaded by default. If necessary, you can make sure that the module is loaded by issuing the following command as  root:

 

 

~]# modprobe --first-time 8021q
modprobe: ERROR: could not insert '8021q': Module already in kernel

To display information about the module, issue the following command:

~]$ modinfo 8021q

See the modprobe(8) man page for more command options.

 

 

7.4.1. Setting Up 802.1Q VLAN Tagging Using ifcfg Files

1.Configure the parent interface in  /etc/sysconfig/network-scripts/ifcfg-ethX, where X is a unique number corresponding to a specific interface,as follows:

 

 

DEVICE=ethX
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes

 

 

2.Configure the VLAN interface configuration in the /etc/sysconfig/network-scripts/directory. The configuration file name should be the parent interface plus a . character plus the VLAN ID number. For example, if the VLAN ID is 192, and the parent interface is eth0, then the configuration file name should be ifcfg-eth0.192:

 

DEVICE=ethX.192
BOOTPROTO=none
ONBOOT=yes
IPADDR=192.168.1.1
PREFIX=24
NETWORK=192.168.1.0
VLAN=yes

 

If there is a need to configure a second VLAN, with for example, VLAN ID 193, on the same interface, eth0, add a new file with the name eth0.193 with the VLAN configuration details.

 

3.Restart the networking service in order for the changes to take effect. As root issue the following command:

 

~]# systemctl restart network

 

7.4.2. Configure 802.1Q VLAN Tagging Using ip Commands

To create an 802.1Q VLAN interface on Ethernet interface eth0, with name VLAN8 and ID 8, issue a command as root as follows:

 

~]# ip link add link eth0 name eth0.8 type vlan id 8

To view the VLAN, issue the following command:

~]$ ip -d link show eth0.8
4: eth0.8@eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT
     link/ether 52:54:00:ce:5f:6c brd ff:ff:ff:ff:ff:ff promiscuity 0
     vlan protocol 802.1Q id 8 <REORDER_HDR>

 

Note that the ip utility interprets the VLAN ID as a hexadecimal value if it is preceded by  0x and as an octal value if it has a leading  0. This means that in order to assign a VLAN ID with a decimal value of  22, you must not add any leading zeros.

To remove the VLAN, issue a command as root as follows:

~]# ip link delete eth0.8

 

================

總結：修改父接口的BOOTPROTO=manual

復制父接口，

清空內容

注入下面的內容：

DEVICE=${SECONF_ETH}.${EXTERNAL_TENANT_NETWORK_VLAN_ID}
BOOTPROTO=none
ONBOOT=yes
IPADDR=${SECOND_SUB_INTERFACE_IP}
PREFIX=24
NETWORK=${SECOND_SUB_INTERFACE_NET}
VLAN=yes