Multicast NetFlow Exports with Flexible NetFlow

Posted in NetFlow, NetFlow Analyzer on May 15th, 2011 by mike@plixer.com
Multicast NetFlow Exports with Flexible NetFlow

I think exporting Multicast NetFlow should be wisely thought out when configuring Flexible NetFlow (FnF). Specifically, I’m talking about ingress vs. egress exports. I sometimes make the suggestion to export only egress with multicast flows.

Why only Egress with Multicast Flows
When exporting multicast flows with ingress only, the destination interface on most flows is reported as 0.  Egress flows display the actual destination interface of multicast flows. We don’t need to export both as this will nearly double the volume of flows exported to the collector.

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Michael Patterson
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