11.2.7. Setting Up 802.1Q VLAN Tagging

  1. If required, start the VLAN 8021q module by issuing the following command as root:
    ~]# modprobe --first-time 8021q
    No visual output indicates the module was not running and has now been loaded. Note that given a correct configuration file, the VLAN 8021q module will be loaded as required and therefore does not need to be loaded separately.
  2. Configure your physical 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
  3. Configure the VLAN interface configuration in /etc/sysconfig/network-scripts. The configuration filename should be the physical interface plus a . character plus the VLAN ID number. For example, if the VLAN ID is 192, and the physical interface is eth0, then the configuration filename should be ifcfg-eth0.192:
    DEVICE=ethX.192
    BOOTPROTO=none
    ONBOOT=yes
    IPADDR=192.168.1.1
    NETMASK=255.255.255.0
    USERCTL=no
    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.
  4. Restart the networking service, in order for the changes to take effect. Issue the following command as root:
    ~]# service network restart