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[Rodolfo Alonso <1905538@xxxxxxxxxxxxxxxxxx>]

** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1905538

Title:
  Some OVS bridges may lack OpenFlow10 protocol

Status in neutron:
  Fix Released

Bug description:
  After commit https://review.opendev.org/c/openstack/neutron/+/371455 OVSAgentBridge.setup_controllers() no longer sets OpenFlow10 protocol for the bridge, instead it was moved to ovs_lib.OVSBridge.create(). 
  However some (custom) OVS bridges could be created by nova/os-vif when plugging VM interface.
  For such bridges neutron does not call create(), only setup_controllers() - as a result such bridges support only OpenFlow13 and ovs-ofctl command fails:

  2020-11-24T20:18:38Z|00001|vconn|WARN|unix:/var/run/openvswitch/br01711489f-fe.24081.mgmt: version negotiation failed (we support version 0x01, peer supports version 0x04)
  ovs-ofctl: br01711489f-fe: failed to connect to socket (Broken pipe)

  Fix: return setting of OpenFlow10 (along with OpenFlow13) to
  setup_controllers(). It's doesn't hurt even if bridge already has
  OpenFlow10 in supported protocols.

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