OpenVswitch and kvm

#virsh edit domain

<interface type='bridge'>
    <mac address='52:54:00:43:1f:f4'/>
    <source bridge='br0'/>
    <virtualport type='openvswitch'/>
    </virtualport>
</interface>

Long live to openvswtich-brcomptt

Now that openvswitch-brcompat is not officially supported with recent kernels (Ubuntu 12.10 with kernel 3.5), the alternative to configure the bridges directly in the interfaces file has change a bit... but is still pretty forward!

Simple case with 1 bridge and 1 attached interface:


allow-ovs br99
iface br99 inet dhcp


    ovs_type OVSBridge
    ovs_ports eth0

allow-br99 eth0
iface eth0 inet manual
    ovs_bridge br0
    ovs_type OVSPort

And to bring it up and down:

ifup --allow=ovs $list_of_bridges
ifdown --allow=ovs $list_of_bridges

Et voilà! 

More info at:  openvswitch-switch.README.Debian