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[1912294464 <1912294464@xxxxxx>]

Public bug reported:

I created some instance with same network and same security group. The security group's remote secrity group is set to itself. 
Then I batch delete these instances.when the first instance's port is deleted,it will notify other neutron-ovs-agent so that these agent could update filter rules for other instance's port.
But variable "defer_refresh_firewall" is set to true,so the update process will not be executed immediately.
During the subsequent instance deletion,the process will be triggered,But the port within  subsequent instance is deleted,So the agent will report error.

2017-11-01 09:30:29.695 9779 ERROR
neutron.agent.linux.openvswitch_firewall.firewall [req-610bc095-2445
-4f2e-8a46-181a82087348 - - - - -] Initializing unfiltered port
2c8f784d-1e73-4e4d-874d-65dd32de4e22 that does not exist in ovsdb: Port
2c8f784d-1e73-4e4d-874d-65dd32de4e22 is not managed by this agent..:
OVSFWPortNotFound: Port 2c8f784d-1e73-4e4d-874d-65dd32de4e22 is not
managed by this agent.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1729213

Title:
  neutron-ovs-agnet report error when batch delete instances

Status in neutron:
  New

Bug description:
  I created some instance with same network and same security group. The security group's remote secrity group is set to itself. 
  Then I batch delete these instances.when the first instance's port is deleted,it will notify other neutron-ovs-agent so that these agent could update filter rules for other instance's port.
  But variable "defer_refresh_firewall" is set to true,so the update process will not be executed immediately.
  During the subsequent instance deletion,the process will be triggered,But the port within  subsequent instance is deleted,So the agent will report error.

  2017-11-01 09:30:29.695 9779 ERROR
  neutron.agent.linux.openvswitch_firewall.firewall [req-610bc095-2445
  -4f2e-8a46-181a82087348 - - - - -] Initializing unfiltered port
  2c8f784d-1e73-4e4d-874d-65dd32de4e22 that does not exist in ovsdb:
  Port 2c8f784d-1e73-4e4d-874d-65dd32de4e22 is not managed by this
  agent..: OVSFWPortNotFound: Port 2c8f784d-1e73-4e4d-874d-65dd32de4e22
  is not managed by this agent.

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