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Syslog message: XMCHIP.*FI.*Protect.*Parity error for .* freepool SRAM

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Article ID: KB31610 KB Last Updated: 06 Oct 2021Version: 3.0
Summary:

The "FI Protect Parity error for freepool SRAM" message reports a transient hardware memory error.

This is a Troubleshooting Article for a PFE ASIC Syslog Event.
To view other documented syslog events related to XMCHIP, XLCHIP, MQCHIP, LUCHIP, EACHIP, and PECHIP, see KB31893 - Index of Articles for Troubleshooting PFE ASIC Syslog Events.

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Symptoms:

When a "FI Protect Parity error for freepool SRAM" event occurs, a message similar to the following is reported:

Oct 14 23:55:05 router0 fpc0 XMCHIP(1):XMCHIP(1): FI: Protect: Parity error for CP freepool SRAM (List pointers get dropped)
Nov 5 00:20:59 router1 : %PFE-0: fpc0 :XMCHIP(0): FI: Protect: Parity error for L2 freepool SRAM (List pointers get dropped)

Indications:

  • Single occurrence of syslog, not seen with other events, indicates a one time hardware error. Multiple continuous occurrences indicate persistent underlying issues.
  • No permanent impact on packet forwarding with the single occurrence.
  • Alarm will be raised.

 

Cause:

This is a transient hardware error. This is the only SRAM parity error which looks like a transient condition and does not compromise packet forwarding with simulations in house. It causes a leak of the list pointers and affects the throughput performance of this pool at Fabrit Input.  It is not clear how many pointers get affected and it is un-deterministic. In production, you may not see an impact. However, if you make 100% throughput performance measurements, then you could see an impact. The suggestion is to restart the MPC at next the convenient time.

Solution:

Perform these steps to determine the cause and resolve the problem (if any).  Continue through each step until the problem is resolved.

  1. Collect the show command output.

    Capture the output to a file (in case you have to open a technical support case). To do this, configure each SSH client/terminal emulator to log your session.

    show log messages
    show log chassisd
    start shell network pfe <fpc#>
    show nvram
    show syslog messages
    exit

  2. Analyze the show command output.

    In the 'show log messages', review the events that occurred at or just before the appearance of the "FI Protect Parity error for freepool SRAM" message. Frequently these events help identify the cause.

  • No RMA required.

  • With a single occurrence, the alarm can be cleared using the following command:

    • clear chassis fpc errors fpc-slot <x> all

    • Note: This command is available in Junos OS 14.2R8, 15.1R7, 15.1X49-D140, 16.1R4-S2, 16.1R5, 16.2R3, 17.1R2, and 17.2R1 or higher.

  • The multiple continuous occurrences of errors require FPC restart during a Maintenance Window to clear the alarms.

  • Contact your technical support representative for more analysis.

This article is indexed in KB31893 - Primary Index of Articles for Troubleshooting PFE ASIC Syslog Events ; tag XMCHIPTSG

Tip: When looking at an event in the logs, it is important to focus on the first error message in a collection of syslog messages. The first error message is usually the cause of all the follow-on error messages. The follow-on collateral damage error messages can be ignored.

 

Modification History:
2018-05-01: Updated list of Junos releases that have the "clear chassis fpc error" command available.
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