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New Member

ERROR DECORDING REQUEST

Hi,

I would like if some one explain me the following error message. It is appeared on 4006 switch where some user are experincing slow network connections where as some are working fine.

2002 Aug 19 01:35:38 PDT -02:00 %SYS-4-P2_WARN: 1/Invalid crc, dropped packet, count = 348676

Regards,

2 REPLIES
Cisco Employee

Re: ERROR DECORDING REQUEST

Generally this error message indicates Packet Buffer CRCs, not front panel port CRCs. A CRC check is done as packets are copied in and out of the packet buffer SRAM. Packets with an invalid CRC are dropped by the Supervisor. Good packets are then stored in packet buffer memory. When the CPU gets a packet, it just knows the memory address where the packet is stored and software reads it from there. In software, the software will check the CRC after reading a packet from memory and if the CRC is bad, the software will log an "Invalid CRC message" and drop the packet . A InvalidPacketBufferCRC count is incremented in NVRAM and Syslog Message is logged as well. The log message is rate limited and you will see only one message in a short interval of 5-10mins (time interval could vary depending on software release). It is normal in any enviroment to get a few InvalidPacketBufferCRCs every few days for the same reason there are PMPEs. However, the InvalidPacketBufferCRCs is incrementing steadily or if the count is in the thousands , then there may be faulty SRAM or other faulty component on the Supervisor. The Power-On Self Test (POST) will check for possible fauty SRAM failures; however, the POST Test is not 100% conclusive for intermittant SRAMs failures. Another possible issue for serveral InvalidPacketBufferCRCs is CSCdt80707 and CSCdu48749 if code version is not 5.5.10 or higher, or 6.2.3 and higher

Note: The count in NVRAM is the total number of InvalidPacketBufferCRCs packets that were received by the CPU since bootup.

New Member

Re: ERROR DECORDING REQUEST

Thank you.

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