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Syslog message: EA.*HMCIF Rx.*Link.*Response FIFO . overflow

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Article ID: KB31722 KB Last Updated: 12 Oct 2021Version: 2.0
Summary:

The "Response FIFO overflow" message reports an EACHIP memory buffer overflow condition.

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 "Response FIFO overflow" event occurs, a message similar to the following is reported:

Jul 23 19:04:43.744 router0: %PFE-3: fpc8 Cmerror Op Set: EA[0:0]: EA[0:0]: HMCIF Rx: Link0: Response FIFO 0 overflow

Indications:

  1. Traffic impact or PFE packet forwarding is permanently compromised if errors are seen repeatedly

  2. Major Alarm will be raised

Cause:

This is due to a transient hardware issue.

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 "Response FIFO overflow" message. Frequently, these events help identify the cause.

  • No RMA is required

  • FPC restart during a maintenance window should clear this error.

  • Contact your technical support representative if seen again as RMA might be needed

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


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.
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