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Cisco Bug: CSCvv32141 - Traffic drop with jumbo frame size in r72x on 5500 when pfc is enabled

Last Modified

Aug 12, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.2.2.BASE

Description (partial)

Symptom:
When pfc feature is enabled and 8P qos policy is applied, traffic drop can be observed on line card listed below for jumbo packet size like 7K or more. 
This is seen in r72x.

Card variant : 
NC55-36X100G
NC55-36X100G-S
NC55-36X100G-A-SE
NC55-24H12F-SE
NC55-24X100G-SE
NC55-6x200-DWDM-S
NC55-18H18F

Conditions:
When PFC policy which has pause threshold configuration and 8 priority class-map is applied on card listed above, traffic drop can be seen.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
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