Description

Observed FPC flap on mx10003 which flapped all the interfaces on it. Need assistance to check the FPC health to prevent similar issues.

Symptoms

Oct 30 09:09:38.630 labroot fpc0 CMError: /fpc/X/pfe/0/cm/0/PLL_Error/0/PLL_CMERROR_MPC_LMK04808_MISC_LOS (0x170018), scope: board, category: functional, severity: major, module: PLL Error, type: LMK04808_MISC PLL LOS

Oct 30 09:09:38.631 labroot fpc0 Performing action reset-fru for error /fpc/0/pfe/0/cm/0/PLL_Error/0/PLL_CMERROR_MPC_LMK04808_MISC_LOS (0x170018) in module: PLL Error with scope: board category: functional level: major

Oct 30 09:09:38.640 labroot chassisd[28817]: CHASSISD_FPC_ASIC_ERROR: <FPC 0> ASIC Error detected errorno 0x00170018 Restart action performed 

Oct 30 09:09:38.642 labroot fpc0 Cmerror Op Set: PLL Error: LMK04808_MISC_LOS (URI: /fpc/0/pfe/0/cm/0/PLL_Error/0/PLL_CMERROR_MPC_LMK04808_MISC_LOS)

Oct 30 09:09:38.691 labroot chassisd[28817]: CHASSISD_FRU_OFFLINE_NOTICE: Taking FPC X offline: FPC reset by error manager

 

Solution

The primary issue is a PLL Error on FPC X, which resulted in the FPC going offline and resetting. This type of error usually points to hardware or timing synchronisation issues.

The FPC will automatically reboot to clear the ASIC/PLL error. If this was a one-time transient hardware issue, the FPC should resume normal functionality, but monitoring for the next 24 hours is recommended.

If the issue reoccurs, please reach out to JTAC for further assistance and in-depth analysis.

 

Modification History

2024-10-30 : Article Created