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NetFlow 102 – FNF – Flexible NetFlow

Netflow configuration is different by platform and IOS version. Initially, Cisco IOS supported what is now known as “Traditional/Original Netflow(TNF)”, but newer versions of the IOS support “Flexible Netflow (FNF). Support for Traditional Netflow configuration is being dropped from neweer IOS versions, so if available, use Flexible Netflow configuration on …

NetFlow 101 – TNF – Traditional NetFlow

1. What is a flow A flow is defined by the combination of the following seven key fields: Source IP address Destination IP address Source port number Destination port number Layer 3 protocol type Type of service (ToS) Input logical interface 2. Gathering information Netflow requires CEF, so before beginning, …