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Cisco Bug: CSCuj00114 - Traffic drop during flow learning phase

Last Modified

Jan 17, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.1.BASE

Description (partial)

Symptom:

~ 100 us of traffic drop during scaled flow learning at IMIX or lower traffic rates matching 
flow aware UBRL / CAC classes

Conditions:

Traffic profile should have 1000s of flows and all incident on NP port hosting 
the flow aware policy (ingress / egress) simultaneously causing large scale flow learning.
Relatively high traffic load of about 90% linerate at 256 B pkt size would be required to 
make the transient drops visible.

The more the PPS on the NP, the more would be the push back drops and discards as NP 
load goes higher
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