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[Aaron Rosen <aaronorosen@xxxxxxxxx>]

Restarting the l2-agent causes the vlan tag to be restored.

** Changed in: nova
       Status: New => Confirmed

** Also affects: neutron
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1290854

Title:
  Missing internal ovs vlan tag for a port of resumed instance

Status in OpenStack Neutron (virtual network service):
  New
Status in OpenStack Compute (Nova):
  Confirmed

Bug description:
  If we suspend and then resume an instance it becomes unreachable from
  the tenant network

  $nova boot --image 263f4823-f43c-4f2a-a845-2221f4a2dad1 --flavor 1
  --nic net-id=61ade795-f123-4880-9ab5-a73e0c1b2e70 server1

  $ ping 10.0.0.8                                                                                                     
  PING 10.0.0.8 (10.0.0.8) 56(84) bytes of data.
  64 bytes from 10.0.0.8: icmp_req=1 ttl=63 time=46.5 ms
  64 bytes from 10.0.0.8: icmp_req=2 ttl=63 time=0.675 ms
  64 bytes from 10.0.0.8: icmp_req=3 ttl=63 time=0.572 ms

  $ nova suspend 9b55928f-e6c7-49b3-9480-0df926dc6a08
  $ nova resume 9b55928f-e6c7-49b3-9480-0df926dc6a08 

  $ ping 10.0.0.8
  PING 10.0.0.8 (10.0.0.8) 56(84) bytes of data.
  From 172.24.4.2 icmp_seq=1 Destination Host Unreachable
  From 172.24.4.2 icmp_seq=2 Destination Host Unreachable
  From 172.24.4.2 icmp_seq=3 Destination Host Unreachable

  ovs-vsctl shows that after resume the instanse's port lacks its VLAN
  tag

  before suspend:
  Port "tap69cb10fd-43"
              tag: 1
              Interface "tap69cb10fd-43"

  after suspend:
  Port "tap69cb10fd-43"
              tag: 1
              Interface "tap69cb10fd-43"

  after resume:
   Port "tap69cb10fd-43"
              Interface "tap69cb10fd-43"

  
  The reason of such behavior is due to the patch https://review.openstack.org/#/c/67981/7 which introduced
  removing and recreating of existing interfaces.

  What's more it seems that ovs-agent doesn't notice tag's disappearance
  and that's why it doesn't mark it as updated.

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