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Cisco Bug: CSCuo52040 - NetFlow: Lack of flow hashing collision detection

Last Modified

Jun 04, 2015

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

2.2(1.219)B

Description (partial)

Symptom:
UCS doesn't not export any NetFlow information related to flows experiencing a hashing collision. For example, the flow byte counters and packet counters are not incremented for packets belonging to colliding flows. Other than the lack, the network traffic of flows experiencing a hashing collisions in the flow cache will not be otherwise adversely affected. This behavior is common to other Cisco products implementing NetFlow.

However, unlike other Cisco products supporting NetFlow, UCS doesn't provide any alerts messages or counters related to flow hashing collisions events happening in the flow cache.

Conditions:
A NetFlow session is enabled for the affected interested flows.
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