This indicates whether automatic reversion back to this co-routed tunnel after it recovers from a fault is turned on or off, exactly mirroring the reversion setting on the unidirectional tunnel type but applied to a bidirectional circuit. An admin turns this off on circuits where a second unplanned switch-back could disrupt a sensitive bidirectional service like circuit-emulated TDM traffic, preferring a manually-scheduled switch-back instead. For example, a co-routed TDM circuit with reversion off stays on its backup path after recovering from a fault until the admin explicitly reverts it during a maintenance window.