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Cisco Bug: CSCvi93011 - One or more fabric links go down when legacy CRS is upgraded to FC-400G cards with FP-140G MSC

Last Modified

Feb 07, 2019

Products (18)

  • Cisco Carrier Routing System
  • Cisco CRS-1 Line Card Chassis (Dual)
  • Cisco CRS-X 8-Slot Single-Shelf System
  • Cisco CRS-1 Line Card Chassis (Multi)
  • Cisco CRS-1 16-Slot Line Card Chassis
  • Cisco CRS-X Multishelf System
  • Cisco CRS-3 Multishelf System
  • Cisco CRS-1 4-Slot Single-Shelf System
  • Cisco IOS XR Software
  • Cisco CRS-1 8-Slot Line Card Chassis
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Known Affected Releases

Description (partial)

When using the FP-140G with 1/100GBE line card in legacy CRS chassis we see that the 1/29 fabric link goes down on the device. The issue is seen after the device is upgraded using FC-400G fabric cards. Also, following log  messages appear on the device:

fabricq_mgr[182]: %PLATFORM-CIH-1-ASIC_ERROR_RETRAIN_LINK : fabricq[1]: A link-err error has occurred causing  packet drop persistent. 0x111d0028

fabricq_mgr[182]: %FABRIC-FABRICQ-1-FFI_LINK_BRINGDOWN : Fabric link 25 on ASIC 1 is brought down due to too many 8B/10B decode errors

However, there were no packet drops seen on the device.

- On the line cards: FP-140G along with 4/10GBE or 1/100GBE PLIM were used. 
- The CRS chassis was legacy.
- The device was upgraded recently using FC-400G fabric cards with the legacy chassis.
- The fabric links were shut/no-shut but didn't fix the issue. 
- The re-seat of fabric and line cards had no impact on the device behavior.
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