Comment 4 for bug 1675289

Some additional research

Without "hash" method, ovs will use the default xlate_default_select_group() method, which uses all these parameters:
https://github.com/openvswitch/ovs/commit/1d1aae0b2f9a149bf74000d975fbf29d133cd9ca

So load balancing should actually be OK, even if not on the fields specified in the spec:
https://github.com/openstack/networking-sfc/blob/master/doc/source/ovs_driver_and_agent_workflow.rst#group-table-flows

The fix should be:
* enable OpenFlow 1.5
* set selection_method to "hash"
* use lb_fields for selection parameters
* else use default selection parameters ip_src,nw_proto,tp_src

Does this sound right?