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Roman, I actually just tried to reproduce this with a single-node setup.
What I did was this:

1. Run devstack to setup an all-in one with ML2 and VLANs.
2. Create a VM. Assign a floating IP.
3. Ping the floating IP from the host.
4. Restart OVS.
5. The ping keeps working.

So, I'm wondering what's different here. I'll setup a multi-node
devstack and verify now, but I think my prior comments about the L3
agent from #37 were incorrect. Are you sure you're running up to commit
53b701a3f91530c9462a9cb0690aaf68efd45f6d on all of your nodes?

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https://bugs.launchpad.net/bugs/1290486

Title:
  neutron-openvswitch-agent does not recreate flows after ovsdb-server
  restarts

Status in OpenStack Neutron (virtual network service):
  Confirmed
Status in neutron icehouse series:
  In Progress
Status in tripleo - openstack on openstack:
  Triaged

Bug description:
  The DHCP requests were not being responded to after they were seen on
  the undercloud network interface.  The neutron services were restarted
  in an attempt to ensure they had the newest configuration and knew
  they were supposed to respond to the requests.

  Rather than using the heat stack create (called in
  devtest_overcloud.sh) to test, it was simple to use the following to
  directly boot a baremetal node.

      nova boot --flavor $(nova flavor-list | grep "|[[:space:]]*baremetal[[:space:]]*|" | awk '{print $2}) \
            --image $(nova image-list | grep "|[[:space:]]*overcloud-control[[:space:]]*|" | awk '{print $2}') \
            bm-test1

  Whilst the baremetal node was attempting to pxe boot a restart of the
  neutron services was performed.  This allowed the baremetal node to
  boot.

  It has been observed that a neutron restart was needed for each
  subsequent reboot of the baremetal nodes to succeed.

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