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[Oleg Bondarev <obondarev@xxxxxxxxxxxx>]

Public bug reported:

The error message is seen on each ovs agent resync on compute node where
there are dvr serviced ports. Resync can be triggered by any error -
this is unrelated to this bug.

The error message appears on processing distributed router port for a
subnet which is already in local_dvr_map of the agent, see
_bind_distributed_router_interface_port in ovs_dvr_neutron_agent.py:

 if subnet_uuid in self.local_dvr_map:
     ldm = self.local_dvr_map[subnet_uuid]
     csnat_ofport = ldm.get_csnat_ofport()
     if csnat_ofport == constants.OFPORT_INVALID:
         LOG.error(_LE("DVR: Duplicate DVR router interface detected "
                       "for subnet %s"), subnet_uuid)
         return

where csnat_ofport = OFPORT_INVALID by default and can only change when
the agent processes csnat port of the router - this will never happen on
compute node and we'll see the misleading log.

The proposal would be to delete the condition and the log as they're
useless.

** Affects: neutron
     Importance: Medium
     Assignee: Oleg Bondarev (obondarev)
         Status: Confirmed


** Tags: l3-dvr-backlog

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https://bugs.launchpad.net/bugs/1629816

Title:
  Misleading "DVR: Duplicate DVR router interface detected for subnet"

Status in neutron:
  Confirmed

Bug description:
  The error message is seen on each ovs agent resync on compute node
  where there are dvr serviced ports. Resync can be triggered by any
  error - this is unrelated to this bug.

  The error message appears on processing distributed router port for a
  subnet which is already in local_dvr_map of the agent, see
  _bind_distributed_router_interface_port in ovs_dvr_neutron_agent.py:

   if subnet_uuid in self.local_dvr_map:
       ldm = self.local_dvr_map[subnet_uuid]
       csnat_ofport = ldm.get_csnat_ofport()
       if csnat_ofport == constants.OFPORT_INVALID:
           LOG.error(_LE("DVR: Duplicate DVR router interface detected "
                         "for subnet %s"), subnet_uuid)
           return

  where csnat_ofport = OFPORT_INVALID by default and can only change
  when the agent processes csnat port of the router - this will never
  happen on compute node and we'll see the misleading log.

  The proposal would be to delete the condition and the log as they're
  useless.

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