Comment 6 for bug 1384240

I saw similar issue with my dev environment after I unstack and stack many times.
root@zegacn1:/home/zega# ifconfig | grep encap
br-int Link encap:Ethernet HWaddr 3e:af:f8:3a:3d:40
br-tun Link encap:Ethernet HWaddr 76:26:6e:24:05:43
eth0 Link encap:Ethernet HWaddr 00:0c:29:d8:3b:ab
eth1 Link encap:Ethernet HWaddr 00:0c:29:d8:3b:b5
eth2 Link encap:Ethernet HWaddr 00:0c:29:d8:3b:bf
lo Link encap:Local Loopback
qbr03a4f8d6-e5 Link encap:Ethernet HWaddr 7a:9a:91:94:d5:d7
qbr1e564f70-f1 Link encap:Ethernet HWaddr 5a:20:4b:28:08:ec
qbrbd6bd7f0-c7 Link encap:Ethernet HWaddr 16:20:c0:8f:3f:ad
qbrdcdc77d2-c6 Link encap:Ethernet HWaddr 4e:95:ed:c2:1f:3d
qvb03a4f8d6-e5 Link encap:Ethernet HWaddr 7a:9a:91:94:d5:d7
qvb1e564f70-f1 Link encap:Ethernet HWaddr 5a:20:4b:28:08:ec
qvbbd6bd7f0-c7 Link encap:Ethernet HWaddr 16:20:c0:8f:3f:ad
qvbdcdc77d2-c6 Link encap:Ethernet HWaddr 4e:95:ed:c2:1f:3d
qvo03a4f8d6-e5 Link encap:Ethernet HWaddr b6:fd:4a:5f:86:de
qvo1e564f70-f1 Link encap:Ethernet HWaddr 3e:ee:1f:63:a8:4b
qvobd6bd7f0-c7 Link encap:Ethernet HWaddr 96:a0:49:0e:86:31
qvodcdc77d2-c6 Link encap:Ethernet HWaddr 5a:bb:e4:cc:bc:c8
tap1e564f70-f1 Link encap:Ethernet HWaddr fe:16:3e:6f:03:03
virbr0 Link encap:Ethernet HWaddr 36:96:e8:ad:2b:9f

In neutron database, there is no port.
zega@zegacn1:~/devstack$ neutron port-list
+--------------------------------------+------+-------------------+---------------------------------------------------------------------------------+
| id | name | mac_address | fixed_ips |
+--------------------------------------+------+-------------------+---------------------------------------------------------------------------------+
| 1e564f70-f121-48ad-af68-99ea38419248 | | fa:16:3e:6f:03:03 | {"subnet_id": "fc07a567-c83e-4ec3-9015-2ceb71485759", "ip_address": "10.0.0.2"} |
| 73e02e4e-12c2-4dcf-843d-631d813768e0 | | fa:16:3e:a2:09:44 | {"subnet_id": "fc07a567-c83e-4ec3-9015-2ceb71485759", "ip_address": "10.0.0.3"} |
| 76e80323-258d-4e90-b12f-aa6971fae156 | | fa:16:3e:6a:46:c8 | {"subnet_id": "fc07a567-c83e-4ec3-9015-2ceb71485759", "ip_address": "10.0.0.1"} |
+--------------------------------------+------+-------------------+---------------------------------------------------------------------------------+

I think OVS created the port during stack.sh, but didn't cleanup during unstack.sh. Something with devstack?