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[LIU Yulong <yulong@xxxxxxxxxxxxx>]

Public bug reported:

When subnets or security group ports quantity reach 2000+, there are many stale flows.
Some basic exception procedure:
(1) ovs-agent dump-flows
(2) ovs-agent delete some flows
(3) ovs-agent install new flows (with new cookies)
(4) any exception raise in (2) or (3), such as (bug #1813705)
(5) ovs-agent will do full sync again, then go back to (1)
Finally it will get many stale flows installed, and sometimes cause data plane down.

This is a subproblem of bug #1813703, for more information, please see the summary:
https://bugs.launchpad.net/neutron/+bug/1813703

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1813712

Title:
  [L2][scale issue] ovs-agent has multipe cookies flows (stale flows)

Status in neutron:
  New

Bug description:
  When subnets or security group ports quantity reach 2000+, there are many stale flows.
  Some basic exception procedure:
  (1) ovs-agent dump-flows
  (2) ovs-agent delete some flows
  (3) ovs-agent install new flows (with new cookies)
  (4) any exception raise in (2) or (3), such as (bug #1813705)
  (5) ovs-agent will do full sync again, then go back to (1)
  Finally it will get many stale flows installed, and sometimes cause data plane down.

  This is a subproblem of bug #1813703, for more information, please see the summary:
  https://bugs.launchpad.net/neutron/+bug/1813703

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