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Cisco Bug: CSCuz62750 - Incremental drops on counter DROP_FRM_CRC_ERR_SGMII0 causes traffic loss

Last Modified

Sep 02, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

all

Description (partial)

Symptom:
Partial data traffic loss can be observed. Below list counters need to focus to determine the issue:-

"show controller np counters all loc <location>" could indicate FRM_FRM  or CRC drop counts.

1082  DROP_FRM_CRC_ERR_SGMII0                           1429516994           0
1083  DROP_FRM_FRM_ERR_SGMII0                             74455703           0
1084  DROP_FRM_CRC_ERR_SGMII1                           1427728248           0
1085  DROP_FRM_FRM_ERR_SGMII1                             74942820           0
1086  DROP_FRM_CRC_ERR_SGMII2                           1431171380           0
1087  DROP_FRM_FRM_ERR_SGMII2                             75133739           0
1088  DROP_FRM_CRC_ERR_SGMII3                           1436187894           0
1089  DROP_FRM_FRM_ERR_SGMII3                             74761074           0

It is also theoretically possible for data corruption to happen after the CRC check, which should then be detected at the higher protocol layers.

Conditions:
Problem observed on operational network.  Cause is SEU (single event upset) soft errors.

This issue can affect (A9K-1X100GE-SE/TR, A9K-2X100GE-SE/TR), but not all cards are affected.
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