In RHOSP networking environments, when creating a VM instance, do not bind the instance to a virtual port (vport). Instead, use a port whose IP address is not a member of another port's allowed address pair. + Binding a vport to an instance prevents the instance from spawning and produces an error message similar to the following: + ---- WARNING nova.virt.libvirt.driver [req-XXXX - - - default default] [instance: XXXXXXXXX] Timeout waiting for [('network-vif-plugged', 'XXXXXXXXXX')] for instance with vm_state building and task_state spawning.: eventlet.timeout.Timeout: 300 seconds ----