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The user receives the "%SYS-3-FAB_SYNCERR: [chars] detected" error message in Catalyst 6000/6500 series switches running CatOS
This message indicates that a fabric channel error has been detected. [chars] is the type of channel error, the first [dec] is the channel number, and the second [dec] is the module number.
The system attempts to recover by re-synchronizing or resetting the module. If the system does not recover the module, replace the module.
The synchronization errors can be caused by a hardware issue or a badly seated card. Issue theshow fabric channel switchmode command to check whether the SYNC status is OK. If it is status is OK you can try re-seating the module with testing set to Complete only for testing. Confirm that the testing is error free and that there are no errors in the log.