This value clears the shutdown state on all interfaces that UDLD has disabled due to a detected unidirectional link, and per its own description a read of this object always returns normalOperation(0) regardless of what was previously written. An admin uses it as a one-shot recovery action after fixing a suspected bad cable or transceiver, rather than as a way to query current reset state. For example, after replacing a faulty fiber that UDLD had shut down, an admin would set this to reset(1) to bring the affected ports back into service.