COMMUN_FAIL and BD_STATUS alarms reported on main and extended subrack due to a locked AUX board.
Issue Description:
Over an Huawei OSN 3500 that have extended subrack, Alarms of BD_STATUS appear over the boards(PQ1, XCE, PIU and FAN) of the extended subrack, and COMMUN_FAIL(SXCSB, SL64,EFS0,EGS4,SLQ16) over the main.
Root Cause:
In cases like this, the most probable cause of this problem is the Huawei AUX board. It was necessary to check if was the AUX of the main or the Extended Subrack.The AUX board is take as the main point of failure in this case because it realizes communication between boards in the subrack.