code: def _rt_state_update(route_table_id, dcidr, router_ip="(none)",
                       instance_id="(none)", eni_id="(none)",
                       old_router_ip="(none)", msg="(none)"):
      
      buf = "inst: %s, eni: %s, r_ip: %-15s, o_r_ip: %-15s, msg: %s" % \
            (instance_id, eni_id, router_ip, old_router_ip, msg)
      CURRENT_STATE.vpc_state.setdefault('route_tables', {}). \
                              setdefault(route_table_id, {})[dcidr] = buf
docs: Store a message about a VPC route in the current state.