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[jingting <jingting@xxxxxxxxxxxxxxx>]

Public bug reported:

ENV：neutron/master, vxlan

After the vm live migration, we can observe that the vm is active using
command "nova show". However, the vm network is not ready. When
processing vm live migration, nova invokes neutron update_port. It only
updates the host ID of the port attribute, but doesn't update the rules
on the tun bridge. This means the output port in the rule below is not
updated to the vxlan port, which should be connected to the host node
that the vm is migrated to.

ovs-ofctl dump-flows br-tun | grep 1ef
cookie=0x0, duration=194.884s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=194, priority=1,vlan_tci=0x0306/0x0fff,dl_dst=5a:c6:4f:34:61:06 actions=load:0->NXM_OF_VLAN_TCI[],load:0x1ef->NXM_NX_TUN_ID[],output:24

Due to the reason explained above, the time  for vm migration is
increased. By monitoring the rule status on the tun bridge and the
network connectivity, the network connectivity is restored after the
rule of tun bridge is updated.

Therefore, the time for vm migration can be reduced by updating the rule
immediately.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1541738

Title:
  Rule on the tun bridge is not updated in time while migrating the vm

Status in neutron:
  New

Bug description:
  ENV：neutron/master, vxlan

  After the vm live migration, we can observe that the vm is active
  using command "nova show". However, the vm network is not ready. When
  processing vm live migration, nova invokes neutron update_port. It
  only updates the host ID of the port attribute, but doesn't update the
  rules on the tun bridge. This means the output port in the rule below
  is not updated to the vxlan port, which should be connected to the
  host node that the vm is migrated to.

  ovs-ofctl dump-flows br-tun | grep 1ef
  cookie=0x0, duration=194.884s, table=20, n_packets=0, n_bytes=0, hard_timeout=300, idle_age=194, priority=1,vlan_tci=0x0306/0x0fff,dl_dst=5a:c6:4f:34:61:06 actions=load:0->NXM_OF_VLAN_TCI[],load:0x1ef->NXM_NX_TUN_ID[],output:24

  Due to the reason explained above, the time  for vm migration is
  increased. By monitoring the rule status on the tun bridge and the
  network connectivity, the network connectivity is restored after the
  rule of tun bridge is updated.

  Therefore, the time for vm migration can be reduced by updating the
  rule immediately.

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