What is the preferred Cisco NetFlow Port Number to listen on? Well, it depends. The NetFlow RFC 3954 does not specify a specific NetFlow listening port, however, in my experience 2055 and 9995 or 9996 are the most popular. Fortunately, our NetFlow solution, by default, will listen for any NetFlow/sFlow traffic sent to it on UDP ports 2055, 2056, 4432, 4739, 9995, 9996, and 6343.
Sr. Solutions Engineer
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