On 11/13/2016 01:23 PM, Ivan Borodin wrote: You can set the vlan tag for an interface plugged into an OVS switch with the <vlan> tag: <interface type='bridge'> <source bridge='ovsbr0'/> <virtualport type='openvswitch'> <parameters interfaceid='.....'/> <virtualport> <vlan> <tag id='42'/> </vlan> http://www.libvirt.org/formatdomain.html#elementVlanTag (if you want vlan trunking, you can use <vlan trunk='yes'>, and then can specify multiple <tag> subelements for which vlan tags you want to allow.) If you want a simpler way to have all the guests on a particular switch use the same vlan tag, you can define a libvirt network that points to the OVS switch, set a vlan tag to be used for all guests connecting to that network, then define your guest's interface as <interface type='network'>, pointing to this new network definition. Details for that can be found at: http://www.libvirt.org/formatnetwork.html (search for "openvswitch" and "vlan").