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Cisco Bug: CSCvu36189 - J2 Bundle member went down as lacp not received on peer

Last Modified

Sep 24, 2020

Products (1)

  • Cisco Network Convergence System 5500 Series

Known Affected Releases

7.2.1.BASE

Description (partial)

Release-note

Symptom:
After an ungraceful Fabric Card reload , interrupts are seen on the egress NPU block EPNI.
EPNI.Interrupt_Register.AlignerTransmitSizeAboveThInt
EPNI_1.Interrupt_Register.EtppEbtrErrInt

Due to incorrect sdk handling of these interrupts the transmit from the core gets stuck ,  and  all traffic gets dropped for the specific core.

Conditions:
The issue was seen only with ungraceful FC reloads. In graceful reloads(with plane shut) where the packets gets diverted to other FCs before the reload, the interrupts are not seen. As per asic’s register spec the interrupt is the result of a packet being interpreted wrongly by the parser . From the streams no specific packet could be identified as the culprit since this issue is hit only when there are a substantially high number of streams flowing together and the interrupt is not hit consistently either on every FC reload.
Due to an errata from Broadcom sdk  the interrupt results in two of the egress blocks getting out of sync which results in credits getting stuck between them resulting in packet drops.The errata is fixed in the latest sdk which is part of 7.3.1 XR release. The sdk fix will be back ported to 7.2.2 XR release so that the interrupt does not result in packet drops.
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