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Cisco Bug: CSCum93509 - DDF FPGA false CRC errors detected

Last Modified

May 08, 2020

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

14.0 14.0(400) 14.1(10) 15.0(16) 15.0(911) 15.0(927) 16.0(500) 16.2.0.56515 17.1.2.59147 17.2.0.59184 18.0.0.58728

Description (partial)

Symptom:
DPC migration caused by falsely detected DDF CRC errors.  

Error signature: "DF0 Program CRC error".

Conditions:
Under normal operation DDF FPGA on DPC can falsely detect CRC errors causing a DPC switchover.
Also DPC can really detect CRC errors. In both cases RMA won't fix the issue because  this is not a hardware failure. In case of false positive moving to newer MDF/DDF FPGA helps. In case of real CRC errors the card need to be rebooted.

Refer to following wiki link to know about single event update is causing CRC errors.
http://en.wikipedia.org/wiki/Single_event_upset
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