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[Ivan Dyukov <1756064@xxxxxxxxxxxxxxxxxx>]

it looks like that it was introduced by following nova change:

commit 33cc64fb81773f0c246073d23c525357c9aa3b08
Author: Aaron Rosen <aaronorosen@xxxxxxxxx>
Date:   Mon Jan 20 15:10:27 2014 -0800


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

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https://bugs.launchpad.net/bugs/1756064

Title:
  neutron agent doesn't remove trunk bridge after nova-compute restart

Status in neutron:
  Invalid
Status in OpenStack Compute (nova):
  New
Status in os-vif:
  New

Bug description:
  env:
  backend is openvswitch with DPDK
  Version is Ocata

  Steps:
  Create two networks.
  Create two ports for each network
  Create trunk port
  boot virtual machine with trunk port
  Restart nova-compute on compute node: #  openstack-service restart openstack-nova-compute
  Remove the virtual machine
  Check ovs configuration on compute node: ovs-vsctl show

  Expected result: there is no trunk bridge e.g. tbr-c4ce71ea-7
  Actual result: trunk bridge and services ports are still in ovs configuration. e.g.

      Bridge "tbr-c4ce71ea-7"
          Port "spt-63eb23e7-af"
              tag: 102
              Interface "spt-63eb23e7-af"
                  type: patch
                  options: {peer="spi-63eb23e7-af"}
          Port "tbr-c4ce71ea-7"
              Interface "tbr-c4ce71ea-7"
                  type: internal
          Port "tpt-d6c0e47e-ed"
              Interface "tpt-d6c0e47e-ed"
                  type: patch
                  options: {peer="tpi-d6c0e47e-ed"}

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