code: def remove_nexusport_binding(port_id, vlan_id, vni, switch_ip, instance_id):
      
      LOG.debug("remove_nexusport_binding() called")
      session = bc.get_writer_session()
      binding = _lookup_all_nexus_bindings(session=session,
                                           vlan_id=vlan_id,
                                           vni=vni,
                                           switch_ip=switch_ip,
                                           port_id=port_id,
                                           instance_id=instance_id)
      for bind in binding:
          session.delete(bind)
      session.flush()
      return binding
docs: Removes a nexusport binding.