The "Checksum error detected on" messages are caused by corrupted cell received from the HMC (Hybrid Memory Cube) interfaces failing ECC Checksum.

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 - Master Index of Articles for Troubleshooting PFE ASIC Syslog Events [juniper.net] .

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When a 'Checksum error detected on event occurs', a message similar to the following is reported for both FO or WO side like:

• HMCIF Rx: Checksum error detected on FO response​

• HMCIF Rx: Checksum error detected on WO response​

Jul 19 16:42:17 MX2020-RE1 fpc19 eachip_hmcif_rx_intr_handler(7324): EA[3:0]: HMCIF Rx: Checksum error detected on FO response - Chunk Address 0xd7c599
Jul 19 16:42:18 MX2020-RE1 fpc10 MQSS(2): FI: Error cell sent to reorder engine - Stream 78, Count 37
Jul 19 16:42:18 MX2020-RE1 fpc10 MQSS(3): FI: Error cell sent to reorder engine - Stream 79, Count 11
Jul 19 16:42:18 MX2020-RE1 fpc19 MQSS(2): FO: Packet Error - Error Packets 28, Stream 42
Jul 19 16:42:18 MX2020-RE1 fpc19 eachip_hmcif_rx_intr_handler(7324): EA[2:0]: HMCIF Rx: Checksum error detected on FO response - Chunk Address 0xbad57b
Jul 19 16:42:18 MX2020-RE1 fpc19 MQSS(3): FO: Packet Error - Error Packets 11, Stream 43
Jul 19 16:42:18 MX2020-RE1 fpc19 eachip_hmcif_rx_intr_handler(7324): EA[3:0]: HMCIF Rx: Checksum error detected on FO response - Chunk Address 0x53d21e
Jul 19 16:42:19 MX2020-RE1 fpc10 MQSS(2): FI: Error cell sent to reorder engine - Stream 78, Count 32
Jul 19 16:42:19 MX2020-RE1 fpc10 MQSS(3): FI: Error cell sent to reorder engine - Stream 79, Count 7
Jul 19 16:42:19 MX2020-RE1 fpc19 MQSS(2): FO: Packet Error - Error Packets 39, Stream 42
Jul 19 16:42:19 MX2020-RE1 fpc19 eachip_hmcif_rx_intr_handler(7324): EA[2:0]: HMCIF Rx: Checksum error detected on FO response - Chunk Address 0x949175
Jul 19 16:42:19 MX2020-RE1 fpc19 MQSS(3): FO: Packet Error - Error Packets 4, Stream 43
Jul 19 16:42:19 MX2020-RE1 fpc19 eachip_hmcif_rx_intr_handler(7324): EA[3:0]: HMCIF Rx: Checksum error detected on FO response - Chunk Address 0x53d21e
Jul 19 16:42:19 MX2020-RE1 fpc10 Cmerror Op Set: CM[3]: MPC fabric remote PFE error (rate based) (1) exceed raising threshold (1) occurrance (3) for module/pfe (11:3)
Jul 19 16:42:19 MX2020-RE1 fpc10 Cmerror Op Set: CM[3]: MPC fabric remote PFE error (aggregate based) (1) exceed raising threshold (1) occurrance (3) for module/pfe (11:3)

Indications:

• Packets will be dropped at the remote PFEs with error message, "Error sent to reorder engine".

• The volume of packets being dropped is related to the number of Error cell sent to reorder engine counter.

• Minor Alarm will be raised in FI block if the error rate is reaching the threshold of 100 per second.  The PFE reporting the FI errors is usually not the fault location.

ECC validation has detected an error once receiving the cells from the HMC(Hybrid Memory Cube) interface

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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.

   {SYSLOGSERVICENOWTOKEN.EN_US}

   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 "Checksum error detected" message. Frequently these events help identify the cause.

• If  after FPC restart  reporting the "Checksum error detected on"  and this FPC is not passing the internal Power on Self Test (POST) and reports "Error initializing PFE asics" Hardware Replacements needs to be initiated.

• Contact your technical support representative if this issue is seen again after FPC restart .

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

Note: KB Team - All changes to this article must be approved by the AI-Scripts Review team ( [email protected] ) before re-publishing.