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Cisco Bug: CSCtb57962 - afmon-ea: Increase reliability of tracking temporary flows in EA

Last Modified

Aug 25, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

3.9.0.BASE

Description (partial)

Symptom:
AFMON EA and hardware flow tables will go out of sync when there are very short lived flows. Short lived flows are those wherein the NPU sees packets marked as first sign of life but the flow stops even before end of one user interval is reached. If the policy is removed from the interface before that, EA has no knowledge of these flows and the flows will remain in hardware till they are aged out.

It is possible to exhaust the HW table with such short lived flows thereby preventing any new valid flows to be learnt till these old ones are aged out by HW.

Conditions:

This can happen when
(a) the flows are short lived meaning there are no packets after the first sign of life (and)
(b) the policy is removed from interface before the first interval elapses

This will cause the HW and SW tables to go out of sync till the short lived flows in HW are aged out.
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