Open Stack

Hi there,
I need to delete subnet and net and then create new ones.

I type command:
quantum net-delete xxx
quantum subnet-delete xxx

But: Unable to complete operation on network 2b4be3e0-213f-45af-8a84-933f4f73e3c2. There are one or more ports still in use on the network.
and: Unable to complete operation on subnet f1f1362b-770c-4d90-b4ae-a3889f9b02a4. One or more ports have an IP allocation from this subnet.

I deleted all external routers, so router-list gives null result. Tried to delete port gateway by router-gateway-clear, but I need to specify router, and there are no routers!

port-list gives:
+--------------------------------------+------+-------------------+---------------------------------------------------------------------------------------+
| id                                   | name | mac_address       | fixed_ips                                                                             |
+--------------------------------------+------+-------------------+---------------------------------------------------------------------------------------+
| 116298a9-69dd-4a6e-85c8-05f5295f9678 |      | fa:16:3e:c4:7f:5d | {"subnet_id": "f1f1362b-770c-4d90-b4ae-a3889f9b02a4", "ip_address": "x.x.x.x"} |
| 358b0841-d249-4483-9be2-74e3886c233e |      | fa:16:3e:d9:df:cf | {"subnet_id": "f1f1362b-770c-4d90-b4ae-a3889f9b02a4", "ip_address": "x.x.x.x"} |
+--------------------------------------+------+-------------------+---------------------------------------------------------------------------------------+

When I want to port-delete:
Port 116298a9-69dd-4a6e-85c8-05f5295f9678 has owner network:floatingip and therefore cannot be deleted directly via the port API.

I don't know how to find all the traces and to delete the network, please help me!
Thank you very much to all who can help.