ovs-vsctl --timeout=10 --oneline --format=json -- --may-exist add-br test-br
ip netns add test-ns
ovs-vsctl --timeout=10 --oneline --format=json -- --if-exists del-port test-port -- add-port test-br test-port -- set Interface test-port type=internal external_ids:iface-id=42 external_ids:iface-status=active external_ids:attached-mac=ca:fe:de:ad:be:ee
ip link set test-port netns test-ns
ip netns delete test-ns
ovs-vsctl --timeout=10 --oneline --format=json -- --if-exists del-br test-br