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[Derek Higgins <1385234@xxxxxxxxxxxxxxxxxx>]

** Changed in: tripleo
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1385234

Title:
  OVS tunneling between multiple neutron nodes misconfigured if amqp is
  restarted

Status in OpenStack Neutron (virtual network service):
  Confirmed
Status in Messaging API for OpenStack:
  Incomplete
Status in tripleo - openstack on openstack:
  Fix Released

Bug description:
  At completion of a deployment with multiple controllers, by observing
  the gre tunnels created in OVS by the neutron ovs-agent, one will find
  that some neutron nodes may miss the tunnels in between them or to the
  computes.

  This is due to ovs-agents getting disconnected from the rabbit cluster
  without them noticing and as a result, being unable to receive updates
  from other nodes or publish updates.

  The disconnection may happen following a reconfig of a rabbit node,
  the VIP moving over a different node when rabbit is load balanced, or
  even _during_ tripleo overcloud deployment due to rabbit cluster
  configuration changes.

  This was observed using Kombu 3.0.33 as well as 2.5.

  Use of some aggressive (low) kernel keepalive probes interval seems to
  improve the reliability but a more appropriate fix seems to be support
  for heartbeat in oslo.messaging

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