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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1254924

Title:
  security group update notification sent twice

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

Bug description:
  For several plugins the security group update notification on port-
  update is sent twice.

  1) https://github.com/openstack/neutron/blob/master/neutron/plugins/ml2/plugin.py#L634
  2) https://github.com/openstack/neutron/blob/master/neutron/db/securitygroups_rpc_base.py#L101

  the notification at #1 is sent but not that at #2 if the security group on the port was not updated.
  However if the notication at #2 is sent, then the notification at #1 will always be sent too.

  Therefore the notification at #2 is probably redundant

  This affects at least the following plugins:
  - nec
  - ryu
  - linuxbridge
  - openvswitch
  - ryu

  This causes a lot more traffic on the agent side thus slowing all the
  operations on the agent, including wiring VIF ports.

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