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[Adam Gandelman <1367999@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron/juno
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1367999

Title:
  live-migration causes VM network disconnected forever

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in neutron juno series:
  Fix Released

Bug description:
  OS: RHEL 6.5
  OpenStack: RDO icehouse and master
  Neutron: Linuxbridge + VxLAN + L2pop
  Testbed: 1 controller node + 2 compute nodes + 1 network node

  Reproduction procedure:

  1. Start to ping VM from qrouter namespace using fixed IP
      Start to ping VM from outside using floating IP

  2. Live-migrate the VM from compute1 to compute2

  3. VM Network disconnects after several seconds

  4. Even if Nova reports that the migration is finished,
  Ping is still not working.

  Debug Info on network node:

  Command: ['sudo', 'bridge', 'fdb', 'add', 'fa:16:3e:b3:fd:27', 'dev', 'vxlan-1', 'dst', '192.168.2.103']
  Exit code: 2
  Stdout: ''
  Stderr: 'RTNETLINK answers: File exists\n'

  Cause:
  Before migration, the original fdb entry is there. After migration, l2pop will updates the fdb entry of the VM.
  It adds the new entry that causes ERROR.

  The right operation should be 'replace' not 'add'.

  By the way, 'replace' will safely add the new entry if old entry is
  not existed.

  I think this bug can be marked as High.

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