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Cisco 1941 & Cisco 3945 Configuration

You can perform Cisco 1941 & Cisco 3945 configuration using the following steps:

ip flow-export destination <NFA Server IP> 9996
ip flow-export source {any l3 interface} //loopback interface of the device
ip flow-export version 5
ip flow-cache timeout active 1
ip flow-cache timeout inactive 15

Enable "ip flow ingress" command on all the layer 3 interfaces.

Note: In some cases, Cisco 3900/3945 doesn't support NetFlow v9 flow. Users can configure NetFlow v5 from the following link https://www.manageengine.com/products/netflow/help/configuring-netflow-export-on-an-ios-device.html
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