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[Simon Pasquier <simon.pasquier@xxxxxxxx>]

I just realized that this is because I'm using HVM instances. In that case, Xen Server creates 1 vif and 1 tap and it deletes the tap interface if the domU is able to load the virtualized Xen driver for the NIC.
See http://lists.xen.org/archives/html/xen-devel/2011-12/msg02085.html

** No longer affects: nova

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https://bugs.launchpad.net/bugs/1268955

Title:
  OVS agent updates the wrong port when using Xen + Neutron

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  Environment
  ==========
  - Xen Server 6.2
  - OpenStack Havana installed with Packstack
  - Neutron OVS agent using VLAN

  From time to time, when an instance is started, it fails to get
  network connectivity. As a result the instance cannot get its IP
  address from DHCP and it remains unreachable.

  After further investigation, it appears that the OVS agent running on
  the compute node is updating the wrong OVS port because on startup, 2
  ports exist for the same instance: vifX.0 and tapX.0. The agent
  updates whatever port is returned in first position (see logs below).
  Note that the tapX.0 port is only transient and disappears after a few
  seconds.

  Workaround
  ==========

  Manually update the OVS port on dom0:

  $ ovs-vsctl set Port vif17.0 tag=1

  OVS Agent logs
  ============

  2014-01-14 14:15:11.382 18268 DEBUG neutron.agent.linux.utils [-] Running command: ['/usr/bin/neutron-rootwrap-xen-dom0', '/etc/neutron/rootwrap.conf', 'ovs-vsctl', '--timeout=2', '--', '--columns=external_ids,name,ofport', 'find', 'Interface', 'external_ids:iface-id="98679ab6-b879-4b1b-a524-01696959d468"'] execute /usr/lib/python2.6/site-packages/neutron/agent/linux/utils.py:43
  2014-01-14 14:15:11.403 18268 DEBUG qpid.messaging.io.raw [-] SENT[3350c68]: '\x0f\x01\x00\x19\x00\x01\x00\x00\x00\x00\x00\x00\x04\n\x01\x00\x07\x00\x010\x00\x00\x00\x00\x01\x0f\x00\x00\x1a\x00\x00\x00\x00\x00\x00\x00\x00\x02\n\x01\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00\x81' writeable /usr/lib/python2.6/site-packages/qpid/messaging/driver.py:480
  2014-01-14 14:15:11.649 18268 DEBUG neutron.agent.linux.utils [-]
  Command: ['/usr/bin/neutron-rootwrap-xen-dom0', '/etc/neutron/rootwrap.conf', 'ovs-vsctl', '--timeout=2', '--', '--columns=external_ids,name,ofport', 'find', 'Interface', 'external_ids:iface-id="98679ab6-b879-4b1b-a524-01696959d468"']
  Exit code: 0
  Stdout: 'external_ids        : {attached-mac="fa:16:3e:46:1e:91", iface-id="98679ab6-b879-4b1b-a524-01696959d468", iface-status=active, xs-network-uuid="b2bf90df-be17-a4ff-5c1e-3d69851f508a", xs-vif-uuid="2d2718d8-6064-e734-2737-cdcb4e06efc4", xs-vm-uuid="7f7f1918-3773-d97c-673a-37843797f70a"}\nname                : "tap29.0"\nofport              : 52\n\nexternal_ids        : {attached-mac="fa:16:3e:46:1e:91", iface-id="98679ab6-b879-4b1b-a524-01696959d468", iface-status=inactive, xs-network-uuid="b2bf90df-be17-a4ff-5c1e-3d69851f508a", xs-vif-uuid="2d2718d8-6064-e734-2737-cdcb4e06efc4", xs-vm-uuid="7f7f1918-3773-d97c-673a-37843797f70a"}\nname                : "vif29.0"\nofport              : 51\n\n'
  Stderr: '' execute /usr/lib/python2.6/site-packages/neutron/agent/linux/utils.py:60
  2014-01-14 14:15:11.650 18268 INFO neutron.plugins.openvswitch.agent.ovs_neutron_agent [-] Port 98679ab6-b879-4b1b-a524-01696959d468 updated. Details: {u'admin_state_up': True, u'network_id': u'ad37f107-074b-4c58-8f36-4705533afb8d', u'segmentation_id': 100, u'physical_network': u'default', u'device': u'98679ab6-b879-4b1b-a524-01696959d468', u'port_id': u'98679ab6-b879-4b1b-a524-01696959d468', u'network_type': u'vlan'}
  2014-01-14 14:15:11.650 18268 DEBUG neutron.agent.linux.utils [-] Running command: ['/usr/bin/neutron-rootwrap-xen-dom0', '/etc/neutron/rootwrap.conf', 'ovs-vsctl', '--timeout=2', 'set', 'Port', 'tap29.0', 'tag=1'] execute /usr/lib/python2.6/site-packages/neutron/agent/linux/utils.py:43
  2014-01-14 14:15:11.913 18268 DEBUG neutron.agent.linux.utils [-]
  Command: ['/usr/bin/neutron-rootwrap-xen-dom0', '/etc/neutron/rootwrap.conf', 'ovs-vsctl', '--timeout=2', 'set', 'Port', 'tap29.0', 'tag=1']
  Exit code: 0
  Stdout: '\n'
  Stderr: '' execute /usr/lib/python2.6/site-packages/neutron/agent/linux/utils.py:60

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