Referencing: https://access.redhat.com/knowledge/docs/en-US/Red_Hat_OpenStack_Preview/2/html-single/Getting_Started_Guide/index.html In order for: ovs-vsctl add-br br-int to execute properly, "service openvswitch start" would need to be executed as a prerequisite.
*** This bug has been marked as a duplicate of bug 888553 ***