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Syslog message:XMCHIP.*DRD.*Protect.*Parity error for DRD memory



Article ID: KB31619 KB Last Updated: 06 Oct 2021Version: 4.0

The "Parity error for DRD memory" message reports a transient hardware 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.


When a "Parity error for DRD memory" event occurs, a message similar to the following is reported:
Feb 7 14:51:02 router0 fpc4 XMCHIP(0):XMCHIP(0): DRD: Protect 1: Parity error for DRD memory 7


  • 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 of packet forwarding
  • Alarm will be raised.
  • For each error entry, few data traffic packet drops could be seen, but the losses aren’t persistent and traffic should resume at 100% as before.



The cause is due to a parity error detected in internal memory due to a transient hardware error.



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

  2. Analyze the show command output.

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

    1. No RMA required.      

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

    3. With the single occurrence, the alarm can be cleared using command command, clear chassis fpc errors fpc-slot <x> all

    4. The multiple continuous occurrences of errors require FPC restart during maintenance window to clear the alarms.

    5. Contact your technical support representative if the issue is seen after a FPC restart.


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:
2019-10-14: Article reviewed for accuracy; no changes required.
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