Preview Tool

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


Description (partial)

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.

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.
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.