Are you looking for Catalyst 3750 NetFlow Support?  Unless you own the X model (i.e. Catalyst 3750X) you will need to span a port to an nBox, a SonicWALL in bridge mode or similar.  The Catalyst 3750X NetFlow support is only available if you have invested in the 3KX module.  Without the 3KX, this switch only supports Smart Logging and Telemetry Flexible NetFlow exports.

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The other day we solved a unique customer problem when we figured out that we could monitor IP SLA with Flexible NetFlow instead of SNMP.

What was the problem?

The customer wanted to monitor latency using Cisco Medianet Performance Monitoring but, because the round trip time (RTT) is only calculated during the initial TCP hand shake and then stays up all day, a continuous latency reading could not be obtained.

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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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Are you in need of a Cisco NetFlow collector for network traffic analysis? Do you have an overwhelming amount of traffic on your network, but no way to tell who is using all the bandwidth? You’ve come to the right place! Our NetFlow reporting tool has the most flexible reporting engine available, so you can always find the flows you’re looking for.

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Here’s how to configure the 3KX NetFlow support on the Cisco Catalyst 3750X.  I also outlined exporting CoS with NetFlow or really Flexible NetFlow (FnF).

Setting up Flexible NetFlow is a simple process if you fully understand the 4 steps.   Here’s what I ran to get it working:

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What is packet loss and how do I troubleshoot packet loss with NetFlow and IPFIX? I remember when I was growing up we had a satellite connection for our television and when we would get a big snow storm while watching a movie the quality would become so poor that the movie would look like the image in this post and the movie would become unwatchable. We can attribute the poor video quality to network packet loss, as it’s hard to send network traffic through a blizzard.

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Cisco Systems, Inc. has released a new feature, the NBAR Protocol Pack, which provides an easy way to load multiple Protocol Description Language (PDL) files at one time. Read more »

Visit our website to download a 30 day trial of Scrutinizer.

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This is part 2 of a two part blog on using Cisco IOS within routers to capture specific packets which can be downloaded and viewed locally. Part 1 explains how to setup the packet capture.  The second part outline below explains how to use Medianet Performance Monitoring with Embedded Event Manager (EEM) and embedded packet capture functionality to automatically provide the packets involved with a connection problem. In this example, we are capturing VoIP traffic.

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NetFlow v5/v9, Flexible NetFlow and IPFIX are the most popular IP flow formats. In this blog I would like to briefly talk about each of them, so that this information will allow you to better take advantage of everything flow technology has to offer. Features that could change your network traffic analysis experience forever.

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I wanted this blog to be about using Flexible NetFlow Immediate Cache to capture packets. The problem from my limited understanding is that it can only be done on all TCP or UDP frames as there is currently no filtering capability. For example you can’t setup a Flexible NetFlow (FnF) Immediate Cache to capture only UDP voice traffic for a specific host.  However, I recently learned about Cisco EEM (Embedded Event Manager) which basically allowed us to do what we needed.

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