This read-write TruthValue object marks the connection's associated preferred route (set via cesmChanPrefRouteId) as a directed route, meaning it is the only route the connection is permitted to take, and the connection fails outright if that route becomes unavailable; it has no effect if no preferred route is associated. An administrator enables this when strict path control matters more than resiliency to route failure. For example, a CES circuit carrying traffic that must never be rerouted for regulatory or latency reasons would have this object set to true so it fails rather than silently taking an alternate path.