Good day. I looking at the internals of bridge layout of openvswitch agent at http://docs.openstack.org/network-admin/admin/content/figures/2/figures/under-the-hood-scenario-1-ovs-compute.png and wondering, why this scheme is so complicated and why it use linux bridge and vethes with openvswitch together? Why no just plug tap device directly to openvswitch bridge without intermediate brctl bridge? I guess that was caused by some important consideration, but I unable to find any documents about this. If someone know reasons for that complex construction with different bridges, please response. Thanks.