Comment 7 for bug 1625305

These were the 2 vms I had running on the host.

[root@ip9-114-248-165 ibm]# virsh list --all
 Id Name State
----------------------------------------------------
 5 RHEL73-Jag-1a1cb620-0000000a running
 8 rhel_jag1-0f67d94d-00000002 running

 [root@ip9-114-248-165 ~]# ovs-vsctl show
6fd4b576-698d-41bc-b226-241145207524
    Bridge br-int
        fail_mode: secure
        Port "tap85564a42-ae"
            tag: 3999
            Interface "tap85564a42-ae"
        Port "tap562a7922-11"
            tag: 3999
            Interface "tap562a7922-11"
        Port br-int
            Interface br-int
                type: internal
        Port "int-default0"
            Interface "int-default0"
                type: patch
                options: {peer="phy-default0"}
    Bridge "default0"
        fail_mode: secure
        Port "phy-default0"
            Interface "phy-default0"
                type: patch
                options: {peer="int-default0"}
        Port "enP3p9s0f0"
            Interface "enP3p9s0f0"
        Port "default0"
            Interface "default0"
                type: internal
    ovs_version: "2.3.1-git3282e51"

These 2 were based on a flat network.

Then the KVM host was to be used again to add more networks.

Neutron openvswitch agent is unable to restart because vms with untagged/flat networks (tagged 3999) cause issue with _restore_local_vlan_map

Loaded agent extensions: []
2016-09-06 07:57:39.682 70085 CRITICAL neutron [req-ef8eea4f-c1ed-47a0-8318-eb5473b7c667 - - - - -] KeyError: 3999
2016-09-06 07:57:39.682 70085 ERROR neutron Traceback (most recent call last):
2016-09-06 07:57:39.682 70085 ERROR neutron File "/usr/bin/neutron-openvswitch-agent", line 28, in <module>
2016-09-06 07:57:39.682 70085 ERROR neutron sys.exit(main())
2016-09-06 07:57:39.682 70085 ERROR neutron File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 235, in __init__
2016-09-06 07:57:39.682 70085 ERROR neutron self._restore_local_vlan_map()
2016-09-06 07:57:39.682 70085 ERROR neutron File "/usr/lib/python2.7/site-packages/neutron/plugins/ml2/drivers/openvswitch/agent/ovs_neutron_agent.py", line 356, in _restore_local_vlan_map
2016-09-06 07:57:39.682 70085 ERROR neutron self.available_local_vlans.remove(local_vlan)
2016-09-06 07:57:39.682 70085 ERROR neutron KeyError: 3999
2016-09-06 07:57:39.682 70085 ERROR neutron
2016-09-06 07:57:39.684 70085 INFO oslo_rootwrap.client [req-ef8eea4f-c1ed-47a0-8318-eb5473b7c667 - - - - -] Stopping rootwrap daemon process with pid=70197

This is happening with stable mitaka and neutron