Symptom

The byte counter of a NetFlow flow wraps around just before reaching 4 GB, without exporting the flow to the collector, losing the byte counter stats from before the wrap around.

Conditions

Both of the following conditions must be met: 1) a flow record with short byte counters (i.e. "collect counter bytes") is configured on an interface 2) a flow on that interface counts 4 GB of traffic before hitting the inactive or active timeout

Workaround

Change the flow record to use long byte counters (i.e. "collect counter bytes long").

Further Problem Description