1. Query the alarm settings. The query result indicates that neither alarm suppression nor alarm reversion is enabled. After alarm initialization, the NS2 board still fails to report the RLOS alarm.
2. Run the optp:bid,0,2,6,2,11,0,0 command to check whether an RLOS alarm is generated on a board.
3. Suspect that the RLOS alarms on the above mentioned OTU boards are suppressed by a MUT-LOS alarm on the D40 board at the receiving end. Delete the logical optical fiber from the IN port on the NS2 board, and it is found that the RLOS alarm is reported. Then, create a logical optical fiber connecting to this port, and it is found that the RLOS alarm disappears.4. It is confirmed that this alarm suppression mechanism is applied to the OptiX OSN 6800 of a version earlier than V1R