Restrictions on the alarm reversion function of WDM equipment

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1. The NE software of WDM equipment in each version supports alarm reversion. The alarm reversion has three modes: disabled (no reversion), manual (permanent reversion), and automatic (one-off reversion).
2. Currently, only the R_LOS and MUT_LOS alarms of WDM equipment support reversion, and no other LOS conditions are available.
3. Alarm reversion takes effect only on the NE software. The actual alarm status still exists on boards. Alarms are saved in the blackboxes of boards and can be queried using a PTP command.
By running the :alm-set-bsrep:bid,enable command, you can also find that alarms are reported from boards to the NE software.

Other related questions:
Processing of transient TF alarms on WDM equipment
The processing rules are as follows: 1. If the TF alarm is reported by TC1 or TC2, directly replace the board no matter whether the alarm is reported transiently or persistently. 2. For 71SC1/71SC2: a. If the TF alarm is transiently reported, upgrade the board software to 1.12 or a later version. b. If the TF alarm persists for 5s or longer, or the alarm is still transiently reported after the board software upgrade, replace the board. Most transient TF alarms can be avoided by software upgrades. 3. E1SC1/SC2: a. If the TF alarm is transiently reported, upgrade the board software to 1.27 or a later version. For versions earlier than 1.27, the workarounds are not complete therefore the board software upgrade cannot avoid this alarm. b. If the TF alarm persists for 5s or longer, or the alarm is still transiently reported after the board software upgrade, replace the board. Most transient TF alarms can be avoided by software upgrades.

Alarm threshold query for optical modules on WDM equipment
Run the :cfg-get-almth:bid,port,path,th-type command to query the alarm threshold. The th-typeb field indicates the alarm threshold type.

Dustproof requirements for WDM equipment
The operating environment requirements of WDM equipment must comply with IEC 60529 (Degrees of protection provided by enclosures).

Possible cause of the BUS_ERR alarm reported after WDM equipment is upgraded
If the service mode is incorrectly configured for some boards such as NS2 and TDX, a BUS_ERR alarm will be reported after the upgrade is complete. When a BUS_ERR alarm is reported, verify the line mode.

Rerouting rules of Huawei WDM/OTN ASON systems
Through traffic engineering, a WDM/OTN ASON network has various rerouting constrains: 1. Constraints on explicit network resources: explicit nodes, links, wavelengths, and channels 2. Constraints on excluded network resources: excluded nodes and links 3. Limitation on the quantity of nodes (or hops) traversed by a strict route or service 4. Limitation on the reach of an optical fiber carrying services, loading sharing mode, SRLGs, and associated services 5. Combinations of the preceding constraints

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