This article explains about the "PECHIP_CMERROR" errors that can be seeing on QFX10K platforms. 

-Chassis dropping BGP peering with our other switches.

-Several AE interfaces to several switches were reporting down.

-Active FPC 0 Major Errors alarm

This problem is caused by a HMC error on PECHIP. This will result in a disabled PFE and shut down the interface on the affected PFE to avoid the impact being spread across other PFEs.

root> show chassis alarms no-forwarding

1 alarms currently active

Alarm time        Class Description

2023-05-22 09:45:53 CDT Major FPC 0 Major Errors

Different PECHIP_CMERROR" errors can be seeing as:

• PECHIP_CMERROR_HMCIF_ACCESS_TIMEOUT
• PECHIP_CMERROR_HMCIF_LINK0_INT_REG_HMC_ERR_FATAL (0x2105c8) 
• PECHIP_CMERROR_FABRORD2_ECC_PROTECT_FSET_REG_CORRECTED_L2_TABLE

 Sometimes, traffic can be blackholed during this problematic state.

To clear the alarm, please try below TS steps in MW:

• Try rebooting the fpc.
• If above step doesn't resolve the issue try reseating the fpc card.

As a workaround the following can be configured to reboot the device automatically when this happens, this will reduce the downtime:

#set chassis fpc 0 error fatal action reset

05/26/2023 - KB created