Why does a subcard fail to register on a switch

The possible causes are:
The switch does not support the subcard.
The subcard is not hot swappable and can register successfully only after the switch restarts.
The subcard is not in a good contact with the backplane.
The system version of the switch needs upgrading.
When this occurs, send the bar code of the subcard and switch version information to Huawei technical personnel so that Huawei can fix the problem quickly.

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