This is the holding priority (0-7) this dynamic co-routed tunnel uses to resist being preempted once established, the counterpart to setup priority, applied to a bidirectional reservation covering both directions at once. An admin sets a critical circuit's hold priority low so preemption resistance is guaranteed for both directions simultaneously, since losing either leg would break the symmetric-latency guarantee the co-routed design exists to provide. For example, a hold priority of 0 on this circuit means it survives even aggressive preemption attempts from newly-signaling high-priority LSPs.