Booting of the instance fails after ca 5 minutes:

Openstack server show output:
+-------------------------------------+----------------------------------------+                                                                               [58/270]
| Field                               | Value                                  |
+-------------------------------------+----------------------------------------+
| OS-DCF:diskConfig                   | MANUAL                                 |
| OS-EXT-AZ:availability_zone         |                                        |
| OS-EXT-SRV-ATTR:host                | None                                   |
| OS-EXT-SRV-ATTR:hypervisor_hostname | None                                   |
| OS-EXT-SRV-ATTR:instance_name       | instance-00000013                      |
| OS-EXT-STS:power_state              | NOSTATE                                |
| OS-EXT-STS:task_state               | None                                   |
| OS-EXT-STS:vm_state                 | error                                  |
| OS-SRV-USG:launched_at              | None                                   |
| OS-SRV-USG:terminated_at            | None                                   |
| accessIPv4                          |                                        |
| accessIPv6                          |                                        |
| addresses                           |                                        |
| config_drive                        |                                        |
| created                             | 2020-11-24T10:36:46Z                   |
| fault                               | {'code': 500, 'created':               |
|                                     | '2020-11-24T10:42:02Z', 'message':     |
|                                     | 'Build of instance                     |
|                                     | 08f4563b-65e3-4c4c-82e6-c03dd85fcd52   |
|                                     | aborted: Failed to allocate the        |
|                                     | network(s), not rescheduling.',        |
|                                     | 'details': 'Traceback (most recent     |
|                                     | call last):\n  File                    |
|                                     | "/usr/lib/python3/dist-                |
|                                     | packages/nova/virt/libvirt/driver.py", |
|                                     | line 6529, in                          |
|                                     | _create_domain_and_network\n           |
|                                     | post_xml_callback=post_xml_callback)\n |
|                                     | File                                   |
|                                     | "/usr/lib/python3.6/contextlib.py",    |
|                                     | line 88, in __exit__\n                 |
|                                     | next(self.gen)\n  File                 |
|                                     | "/usr/lib/python3/dist-                |
|                                     | packages/nova/compute/manager.py",     |
|                                     | line 513, in wait_for_instance_event\n |
|                                     | actual_event = event.wait()\n  File    |
|                                     | "/usr/lib/python3/dist-                |
|                                     | packages/eventlet/event.py", line 125, |
|                                     | in wait\n    result = hub.switch()\n   |                                                                               [17/270]
|                                     | File "/usr/lib/python3/dist-           |
|                                     | packages/eventlet/hubs/hub.py", line   |
|                                     | 298, in switch\n    return self.greenl |
|                                     | et.switch()\neventlet.timeout.Timeout: |
|                                     | 300 seconds\n\nDuring handling of the  |
|                                     | above exception, another exception     |
|                                     | occurred:\n\nTraceback (most recent    |
|                                     | call last):\n  File                    |
|                                     | "/usr/lib/python3/dist-                |
|                                     | packages/nova/compute/manager.py",     |
|                                     | line 2378, in                          |
|                                     | _build_and_run_instance\n              |
|                                     | accel_info=accel_info)\n  File         |
|                                     | "/usr/lib/python3/dist-                |
|                                     | packages/nova/virt/libvirt/driver.py", |
|                                     | line 3663, in spawn\n    cleanup_insta |
|                                     | nce_disks=created_disks)\n  File       |
|                                     | "/usr/lib/python3/dist-                |
|                                     | packages/nova/virt/libvirt/driver.py", |
|                                     | line 6552, in                          |
|                                     | _create_domain_and_network\n    raise  |
|                                     | exception.VirtualInterfaceCreateExcept |
|                                     | ion()\nnova.exception.VirtualInterface |
|                                     | CreateException: Virtual Interface     |
|                                     | creation failed\n\nDuring handling of  |
|                                     | the above exception, another exception |
|                                     | occurred:\n\nTraceback (most recent    |
|                                     | call last):\n  File                    |
|                                     | "/usr/lib/python3/dist-                |
|                                     | packages/nova/compute/manager.py",     |
|                                     | line 2200, in                          |
|                                     | _do_build_and_run_instance\n           |
|                                     | filter_properties, request_spec,       |
|                                     | accel_uuids)\n  File                   |
|                                     | "/usr/lib/python3/dist-                |
|                                     | packages/nova/compute/manager.py",     |
|                                     | line 2444, in                          |
|                                     | _build_and_run_instance\n    reason=ms |
|                                     | g)\nnova.exception.BuildAbortException |
|                                     | : Build of instance                    |
|                                     | 08f4563b-65e3-4c4c-82e6-c03dd85fcd52   |
|                                     | aborted: Failed to allocate the        |
|                                     | network(s), not rescheduling.\n'}      |
| flavor                              | m1.small (2)                           |
| hostId                              |                                        |
| id                                  | 08f4563b-65e3-4c4c-82e6-c03dd85fcd52   |
| image                               | bionic-kvm                             |
|                                     | (05248f14-6743-491d-86eb-f2f2a87ec491) |
| key_name                            | ubuntu-keypair                         |
| name                                | sriov-vf1                              |
| project_id                          | f5d50a5fd64f41daa8cae4bb157f5d17       |
| properties                          |                                        |
| status                              | ERROR                                  |
| updated                             | 2020-11-24T10:42:02Z                   |
| user_id                             | 83b934a85ea945bd9e0229fe880e6fc9       |
| volumes_attached                    |                                        |
+-------------------------------------+----------------------------------------+