Possible causes for the automatic restoration failure of the OLP protection

The possible causes for the automatic restoration failure of the OLP protection are as follows:
1. The protection group is in non-revertive mode.
2. The working channel is faulty.
3. A lockout or forced switching command is executed.
4. When the working channel becomes normal, the WTR time of the services needs to be delayed and then the services are switched back to the working channel.

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