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[marvel <1352719@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

in my openstack system, SDN controller(floodlight) and OVS agent to work
together to route packets to and from VMs, but recently I find br-tun
bridges malfunction, in which the flows from SDN controller is removed
and some action=resubmit flows appear,

I read the codes, and find the OVS periodically check the bridge flows,
if some are changed, it seems to believe the ovs has restarted, so it
modify the flows, which is appearntly wrong in the SDN network.

I found the code in neutron/plugins/openvswitch/agent/ovs_neutron_agent.py:
1254             if self.enable_tunneling and tunnel_sync:
1255                 LOG.info(_("Agent tunnel out of sync with plugin!"))
1256                 try:
1257                     tunnel_sync = self.tunnel_sync()
1258                 except Exception:
1259                     LOG.exception(_("Error while synchronizing tunnels"))
1260                     tunnel_sync = True
1261             ovs_restarted = self.check_ovs_restart() <------------------------the line
1262             if ovs_restarted:
1263                 self.setup_integration_br()
1264                 self.setup_physical_bridges(self.bridge_mappings)
1265                 if self.enable_tunneling:
1266                     self.setup_tunnel_br()
1267             if self._agent_has_updates(polling_manager) or ovs_restarted:

The workwround is to comment line 1261 and set ovs_restarted=False,
maybe this is a bug?

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1352719

Title:
  OVS flows from SDN controller deleted by OVS agent

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  in my openstack system, SDN controller(floodlight) and OVS agent to
  work together to route packets to and from VMs, but recently I find
  br-tun bridges malfunction, in which the flows from SDN controller is
  removed and some action=resubmit flows appear,

  I read the codes, and find the OVS periodically check the bridge
  flows, if some are changed, it seems to believe the ovs has restarted,
  so it modify the flows, which is appearntly wrong in the SDN network.

  I found the code in neutron/plugins/openvswitch/agent/ovs_neutron_agent.py:
  1254             if self.enable_tunneling and tunnel_sync:
  1255                 LOG.info(_("Agent tunnel out of sync with plugin!"))
  1256                 try:
  1257                     tunnel_sync = self.tunnel_sync()
  1258                 except Exception:
  1259                     LOG.exception(_("Error while synchronizing tunnels"))
  1260                     tunnel_sync = True
  1261             ovs_restarted = self.check_ovs_restart() <------------------------the line
  1262             if ovs_restarted:
  1263                 self.setup_integration_br()
  1264                 self.setup_physical_bridges(self.bridge_mappings)
  1265                 if self.enable_tunneling:
  1266                     self.setup_tunnel_br()
  1267             if self._agent_has_updates(polling_manager) or ovs_restarted:

  The workwround is to comment line 1261 and set ovs_restarted=False,
  maybe this is a bug?

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