How to Export Netflow Data on a Cisco Router

Step-by-Step Guide

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   Step 1: Check if you have SNMP access to your router.

   If you don’t have SNMP set up on your devices, you will need to configure them using the command line:
   Open a command prompt and telnet into your router.
   
   Login to the device.
   
   Go into privilege mode by typing in enable.
   
   This allows you to make configuration changes.
   
   Type in conf t to give the device configuration commands.
   
   You’ll see a banner to enter in configuration commands.
   
   You will now need to enter in 3 lines of commands to tell the router to start NetFlow and export the data: ip flow-export source fastethernet0/0 (export and source traffic to fastethernet0/0) ip flow-export source version 5 (this exports ver. 5 NetFlow, the best to start with) ip flow-export destination <IP> <port> (location of NMS to send the data to)
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   Step 2: Specify the interface you want to analyze the traffic on by using the interface fastethernet0/0 command.

   Tell that interface what traffic you require: ip flow egress (monitor outbound flow) ip flow ingress (monitor inbound flow) ip route-cache flow ,
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   Step 3: Exit the interface

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   Step 4: exit privilege mode

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   Step 5: and type in one more important command: wr mem (saves configuration data)

Detailed Guide

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