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[PTX] PTX SIB Cell Drop Error alarm

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Article ID: KB35650 KB Last Updated: 06 Apr 2020Version: 1.0
Summary:

This article explains why an "SIB <# > Cell Drop Error" minor alarm may be seen on PTX Series routers and what should be done to resolve the error.

 

Symptoms:

When the Switch Interface Board (SIB) is unable to send fabric traffic towards the FPC, an SIB Cell Drop Error minor alarm is logged.

{MASTER}
user@ptx> show chassis alarms
9 alarms currently active
Alarm time               Class  Description
2019-06-04 07:58:02 UTC  Minor  SIB 8 Cell Drop Error
2019-06-04 07:58:02 UTC  Minor  SIB 7 Cell Drop Error
2019-06-04 07:58:02 UTC  Minor  SIB 6 Cell Drop Error
2019-06-04 07:58:02 UTC  Minor  SIB 5 Cell Drop Error
2019-06-04 07:58:02 UTC  Minor  SIB 4 Cell Drop Error
2019-06-04 07:58:02 UTC  Minor  SIB 3 Cell Drop Error
2019-06-04 07:58:02 UTC  Minor  SIB 2 Cell Drop Error
2019-06-04 07:58:02 UTC  Minor  SIB 1 Cell Drop Error
2019-06-04 07:58:02 UTC  Minor  SIB 0 Cell Drop Error

The message log displays the following:

Apr 06 07:58:02.527 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 0: Cell drop error in plane 1
Apr 06 07:58:02.529 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 1: Cell drop error in plane 2
Apr 06 07:58:02.529 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 1: Cell drop error in plane 3
Apr 06 07:58:02.533 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 2: Cell drop error in plane 4
Apr 06 07:58:02.533 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 2: Cell drop error in plane 5
Apr 06 07:58:02.535 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 3: Cell drop error in plane 6
Apr 06 07:58:02.535 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 3: Cell drop error in plane 7
Apr 06 07:58:02.537 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 4: Cell drop error in plane 8
Apr 06 07:58:02.539 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 5: Cell drop error in plane 10
Apr 06 07:58:02.539 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 5: Cell drop error in plane 11
Apr 06 07:58:02.541 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 7: Cell drop error in plane 14
Apr 06 07:58:02.541 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 7: Cell drop error in plane 15
Apr 06 07:58:02.556 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 8: Cell drop error in plane 16
Apr 06 07:58:02.556 PTX chassisd 2421 CHASSISD_FM_SIB_ERROR - Fabric management error for SIB 8: Cell drop error in plane 17

 

Cause:

This minor alarm is raised when the cell drop rate threshold is exceeded in the event that an FPC undergoes an abrupt restart or an FPC reset is done manually (possibly to clear an error condition) during which the SIBs are unable to send fabric traffic towards the FPC.

In this case, the SIB with the Cell Drop Error is still online to forward traffic.

 

Solution:

To resolve the above alarm, execute the following:

  1. user@ptx> request chassis sib slot <slot number> offline

Wait for a few minutes.

  1. user@ptx> request chassis sib slot <slot number> online

 

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