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.

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We figured out how to report on packet length with NetFlow.  All you have to do is enter “match ipv4 length total” in the flow record of the Flexible NetFlow Configuration .  This entry will export the element ipTotalLength   whereby the NetFlow and IPFIX reporting  tool can provide reports that look like this:

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Most businesses want to take network traffic management to the next step and luckily the IT Gurus within these same companies are already familiar with NetFlow but, what about Flexible NetFlow?  In order to get deeper details on not just the volume of critical apps on the network but, also the performance of the applications, NetFlow has to be taken to the next level.  It is time to mix the export of Cisco NBAR with Performance Monitoring NetFlow or Medianet exports.

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Today I’ll cover the importance of VoIP DSCP prioritization when NetFlow reporting.  We have 3 employees that work remotely in Central Maine, Pennsylvania, and Florida.  They all have Cisco routers and are exporting VoIP data to our NetFlow Analyzer server.  Read the Cisco Medianet Deployment Guide to learn more about setting this up.

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Had a customer call in the other day with a NetFlow Billing question. Apparently his Cisco router is sending over 50,000 flows per second during peak hours.  This is some serious high volume NetFlow. His fancy expensive NetFlow collector couldn’t handle the volume and so we were one of the vendors he turned to.

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