Cisco Systems NetFlow Analyzer s manual Router Configuration, Using the NetFlow Analyzer

the NetFlow Analyzer is listening on. Changing the NetFlow Analyzer listen port is done by going to Tools -> Options -> Analysis Modules -> NetFlow Analyzer, hitting the Options button, and then changing the port as shown in the screenshot.

Router Configuration

It is important to note that in order to receive NetFlow data, a router must be configured to send it to the computer that the NetFlow Analyzer is running on. Configuring a router is outside the scope of these instructions, but I know it can be done!

Note: Keep in mind that if the router is sending NetFlow data, and the NetFlow analyzer is not collecting it, the computer being sent the data will respond with ICMP Destination Unreachable packets.

Using the NetFlow Analyzer

Ok, now the fun begins. To use the NetFlow Analyzer, go to the top level tool bar and select the icons shown in the following image:

Oh what a messy desktop you have. To clean this up, and make it look more like a dashboard, go to the top level Windows menu and select Tile. Now adjust the windows, you should see something like this:

And that's it for the monitor, you are now all knowing and all powerful. But guess what, that's just the beginning.

Multiple NetFlow Capture Windows

With the global monitor you can collect NetFlow from one or more Cisco routers on different networks and aggregate the statistics into a single view. But let's say that you would like to monitor those networks separately. This can be achieved by creating separate NetFlow Adapter entries for each Cisco router, and creating a separate Capture Window for each.

As shown in the image, the key to separating different NetFlow feeds into separate captures is specifying the IP address of the Cisco Router in each NetFlow Adapter

entry. Of course, you can also use a non ip specific NetFlow Adapter entry for a real-time capture window as well and aggregate the feeds into a single capture window. The advantages of monitoring NetFlow with a capture window instead of the global monitor is that the Dashboard, the Expert, and the PeerMap are all capture window features, and not available in the global monitor. Below is a screen shot of a capture window with these features.