This article explains why an "SIB 0 Cell Drop Error" minor alarm may be seen on QFX10002 Series devices and what should be done to resolve the error.

When the Switch Interface Board (SIB) is unable to send fabric traffic towards the FPC, a SIB Cell Drop Error minor alarm is logged. In QFX10002, the SIB module is inbuilt on the device.

lab@qfx> show chassis alarms no-forwarding

1 alarms currently active

Alarm time        Class Description

2024-03-09 05:28:11 PST Minor SIB 0 Cell Drop Error

The message log displays the following:

Mar 09 04:28:11.527 qfx chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 0: Cell drop error in plane 0

This minor alarm is raised when the cell drop rate threshold is exceeded in the event that an device undergoes an abrupt restart or an FPC is under an error condition, such that the SIB is unable to send fabric traffic towards the FPC. To resolve the alarm, you can try to reboot the device using the below command or proceed to power drain the device.

request system reboot hypervisor at now

If the issue persists, please contact JTAC to have the device replaced as this is a potential hardware failure.