[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00mTraceback (most recent call last):
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m File "/opt/stack/neutron/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 445, in fdb_add
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m agent_ports, self._tunnel_port_lookup)
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m File "/usr/local/lib/python2.7/dist-packages/oslo_log/helpers.py", line 46, in wrapper
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m return method(*args, **kwargs)
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m File "/opt/stack/neutron/neutron/agent/l2population_rpc.py", line 234, in fdb_add_tun
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m lvm.network_type)
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m File "/opt/stack/neutron/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 1166, in setup_tunnel_port
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m network_type)
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m File "/opt/stack/neutron/neutron/plugins/openvswitch/agent/ovs_neutron_agent.py", line 1132, in _setup_tunnel_port
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m ofport = br.add_tunnel_port(port_name,
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m File "/opt/stack/neutron/neutron/plugins/openvswitch/agent/openflow/ovs_ofctl/br_tun.py", line 246, in __getattr__
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m raise AttributeError(name)
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00mAttributeError: add_tunnel_port
^[[01;31m2015-06-03 02:05:31.053 TRACE neutron.agent.common.ovs_lib ^[[01;35m^[[00m
2015-06-03 02:05:31.088 ^[[01;31mERROR oslo_messaging.rpc.dispatcher [^[[01;36mreq-74dfb9f4-b9b0-4541-bd2d-115f0a92de14 ^[[00;36mNone None^[[01;31m] ^[[01;35m^[[01;31mException during message handling: add_tunnel_port^[[00m
how to reproduce this bug?