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With quantum/ovs plugin, there is no necessarily a "filteref" in interface param. If not present don't lookup the "filter", let it to None and no more use vnics.fref as resource_id. resource_id becomes : instance_name + instance_uuid + vnic_name fix Bug #1180466 Change-Id: I21c15f9ee4bd5303a7f2e287c7fe69aa7d0d5b0a