- Gold, 750 points or more
can someone please clarify on below error message. this rasid on a cisco 2921 router.
%PLATFORM-5-ECC_MSG: A corrected single bit error has occurred in L2C Data Cache at location 0x347.
thanks alot in advance.
1. The issue could be also transient. Note that this platform tries to fix the parity error in SW by default to avoid service impact. Replacement is needed if such errors are reoccurring.
Errors are in DRAM but in some cases DRAM may be damaged due to HW issues in the router memory slot. In such occurrence router chassis should be replaced as well.
2. Parity errors are data corruptions happenning due to the way DRAM technology is.
These single bit errors occur when a bit in a data word changes unexpectedly due to external events (thus causing for example a zero to spontaneously change to a one). A parity error can happen in all type of RAM, regardless of the manufacturing. There are two kinds of parity errors:
Soft parity errors
These errors occur when an energy level within the chip (for example, a one or a zero) changes, most often due to radiation. When referenced by the CPU, such errors cause the system to crash. In case of a soft parity error, there is no need to swap the board or any of the components.
Hard parity errors
These errors occur when there is a chip or board failure that corrupts data. In this case, you need to re-seat or replace the affected component, which usually involves a memory chip swap or a board swap.
At the first occurrence it is not possible to distinguish between a soft or hard parity errors. From experience, most parity occurrences are soft parity errors, and you can usually dismiss them. Studies have shown that soft parity errors are 10 to 100 times more frequent than hard parity errors. Therefore, Cisco highly recommends you to wait for a second parity error on that particular affected component before you replace anything. This greatly reduces the impact on your network.
To learn more about Parity Errors please check the following CCO documentations:
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Cisco error decoder says :
Parity errors are a single bit error has occurred in memory and is corrected. The system will operate normally, and the operation can continue without interruption. However, if the error happens very frequently at the same location, it may
be a hardware defect and replacement will resolve the issue.
If you are seeing the error message frequently at the same address than RMA would be best option. If you are seeing this error once in awhile than its transient issue.
This is hardware issue and can be resolved by replacing DRAM. Please contact Cisco TAC if error you are seeing these error continously.