VLANs (Virtual LAN) are used to segment portions of a network at layer two and differentiate devices. VLANs are configured on a switch by adding a “tag” to a frame. The 802.1q or dot1q tag will designate the VLAN that the traffic originated from. The Native VLAN is used for any traffic that is not tagged and passes through a switch. To configure a native VLAN, we must determine what interface and tag to assign them, then set the interface as the default native VLAN. Below is an example of adding a native VLAN in Open vSwitch.