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Cisco Bug: CSCvt31268 - Interface flaps on CRS Multi-Chassis systems occur after recovering a failed rack

Last Modified

Sep 02, 2020

Products (18)

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

6.4.3.CE

Description (partial)

After a fabricq halt and reset it is observed traffic is not fowarded to npu from fabricq.
The C2C link flow is not enabled back by npu after the flap(caused by fabricq halt).

Symptom:
Signature:

RP/0/RP1/CPU0:ios#show controllers c2c FIA_1 links 4352 hw info location 1/0/CPU0      
Fri Mar  6 13:23:53.477 UTC
Tx side info for link id 0x1100:
  FIT0 Info:
    Link Enabled             : Yes
    Link Status              : Up
    Flow Control Mode        : Out-Of-Band
    iL+ Enabled              : Yes
    Link Level FC            : Off
    Rx BP Status             : 0x0
    Number Of Chnls          : 4
    Bandwidth                : 200
    Tx Async FIFO Status:    : Empty
    GTR XON status sent      : 0xf 		<<< all flows are enabled
  FIT1 disabled

LC/1/0/CPU0:Mar  6 12:25:52.919 UTC: fabricq_mgr[180]: %PLATFORM-CIH-1-ASIC_ERROR_HARD_RESET_START : fabricq[1]: HARD_RESET needed 0x11160055 
<>
LC/1/0/CPU0:Mar  6 12:25:52.971 UTC: fabricq_mgr[180]: %PLATFORM-CIH-2-ASIC_ERROR_HARD_RESET : fabricq[1]: A generic-err error has occurred causing  halt. 0x11160055  


RP/0/RP1/CPU0:ios#show controllers c2c FIA_1 links 4352 hw info location 1/0/CPU0     
Fri Mar  6 12:26:44.378 UTC
Tx side info for link id 0x1100:
  FIT0 Info:
    Link Enabled             : Yes
    Link Status              : Up
    Flow Control Mode        : Out-Of-Band
    iL+ Enabled              : Yes
    Link Level FC            : Off
    Rx BP Status             : 0x0
    Number Of Chnls          : 4
    Bandwidth                : 200
    Tx Async FIFO Status:    : Empty
    GTR XON status sent      : 0x3		<< flows not enabled.
  FIT1 disabled

Conditions:
Issue not observed till 6.2.3 release.

Seen when the RP is inserted  into a Headless rack in CRS Multiple Chassis system.
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