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Comparing NetFlow and SNMP data

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Article ID: 20612

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Updated On:

Products

CA Infrastructure Performance CA Network Flow Analysis (NetQos / NFA)

Issue/Introduction

There is a difference between reports which use SNMP and CA Network Flow Analysis (ReportAnalyzer) data. Why is there such a difference?

 

Cause

Difference between SNMP data and Netflow 

Environment

All NFA and RA Versions

Resolution

First of all, make sure that the NetFlow configuration is done properly on the router.

=> If NetFlow version 9 is used, then egress and ingress should be enabled on required interfaces

=> If NetFlow version 5 is used, then either ingress should be enabled on all the active interfaces.

Though the NetFlow configuration is correct, NetFlow and SNMP are fundamentally distinct technologies and therefore both may not report the exact same traffic out of a given interface.

When comparing NetFlow and SNMP-based data, the following should be considered: