Open Stack

Hi,

we currently see sporadic communication problems.

After some research we found out, that this is caused by missing 
tunnel-port assignments in table 21 of openvswitch.

Today we had the issue again and here the logs of the add_fdb_entries 
calls at the affected system:

neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent.OVSNeutronAgent 
method add_fdb_entries called with arguments (<neutron.context.Context 
object at 0x7f7264509810>,) {u'fdb_entries': 
{u'cd2baf3d-427c-41be-be56-7cbb8176067f': {u'segment_id': 96, u'ports': 
{u'10.78.23.12': [[u'00:00:00:00:00:00', u'0.0.0.0'], 
[u'fa:16:3e:d0:a0:77', u'192.168.0.2']]}, u'network_type': u'vxlan'}}}

neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent.OVSNeutronAgent 
method add_fdb_entries called with arguments (<neutron.context.Context 
object at 0x7f7264509bd0>,) {u'fdb_entries': 
{u'cd2baf3d-427c-41be-be56-7cbb8176067f': {u'segment_id': 96, u'ports': 
{u'10.78.23.11': [[u'00:00:00:00:00:00', u'0.0.0.0'], 
[u'fa:16:3e:29:0c:d5', u'192.168.0.3']]}, u'network_type': u'vxlan'}}}

neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent.OVSNeutronAgent 
method add_fdb_entries called with arguments (<neutron.context.Context 
object at 0x7f7264509d90>,) {u'fdb_entries': 
{u'cd2baf3d-427c-41be-be56-7cbb8176067f': {u'segment_id': 96, u'ports': 
{u'10.78.12.101': []}, u'network_type': u'vxlan'}}}

neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent.OVSNeutronAgent 
method add_fdb_entries called with arguments (<neutron.context.Context 
object at 0x7f7264627190>,) {u'fdb_entries': 
{u'cd2baf3d-427c-41be-be56-7cbb8176067f': {u'segment_id': 96, u'ports': 
{u'10.79.20.102': [[u'00:00:00:00:00:00', u'0.0.0.0']]}, 
u'network_type': u'vxlan'}}}

The missing tunnel-port is the connection to 10.78.12.101, it looks like 
the empty array/dict may cause this issue.

Any hints how to further debug the situation?

What may cause an empty dict in add_fdb_entries?

Thanks a lot,


  Fabian Zimmermann