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Cisco Bug: CSCus43330 - NCS6K FIA Asic PON Resets due to MBE

Last Modified

Jul 21, 2018

Products (1)

  • Cisco Network Convergence System 6000 Series Routers

Known Affected Releases


Description (partial)

NCS single bit (correctable) and multi-bit (non correctable) parity errors on the broadcom FCT ASIC block are not detectable. In the case of SBEs, this can result in messages similar to the following: 

fia_driver[217]: %PLATFORM-CIH-5-ASIC_ERROR_THRESHOLD : fia[2]: A generic-err error has occurred causing  performance loss transient. CMIC.CMIC_CMC0_IRQ_STAT4.FCT.Interrupt_Register.UnrchDestEvent  Threshold has been exceeded

Since this is a correctable error this has no impact on traffic and can be ignored. A reload of the line card will stop the messages. 

In the case of MBE, this is more severe, causing user traffic lost, user interfaces flap, and fabric planes MCAST_DOWN flap.

For MBE, this issue is easily re-producible. Sequence of events:

1. Fresh reload of Linecard
2. 93% of full mesh traffic sent on all ports using Traffic Generator continuously
3. FIA Asic PON resets will occur nearly immediately about 2 to 3 times after traffic started, and traffic loss is observed
4. FIA Asic will then become stable, and no more traffic loss is observed until the next LC reload.
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