I was recently on a call with a customer who wanted to know which applications use the most bandwidth during working hours—i.e. their top talkers. This gave me a great opportunity to review a specific feature of Flexible NetFlow and AVC integration. I’ve decided to build a small lab with a simple network configuration where …
Defining top talkers with Flexible NetFlow and AVC Read More »
I was working with a customer last week who had configured NetFlow on four of their Cisco routers. They had applied basically the same configuration to each of the routers, but only saw exported flows from three of them arrive at the collector.
Recently I was visiting a customer on site when they mentioned they felt like they were not getting accurate information from their Cisco Catalyst 4510. Upon investigation, their flow record, monitor, and exporter all looked correct. Puzzled, my colleague and I took a look at Cisco’s website and found some interesting information regarding the configuration.
Cisco Catalyst 6509 NetFlow configuration has been a very popular topic in the support room lately. We have been bombarded with questions on how to enable NetFlow on Supervisor Engines 720, 2T, and of course, 6T. Since the reporting accuracy of your NetFlow analyzer depends on the quality of the exported data, discussing some of …
Last week I was working with a customer who needed help with a Cisco NGA Configuration (NetFlow Generation Appliance). The customer was running the Cisco NGA 3140 (NGA3140-K9) model and had questions with how to setup version 5 versus version 9 NetFlow. In this blog I will take a look at steps needed to setup …
This blog aims to do one thing, show you how to monitor VoIP traffic on your network. I get questions, almost daily, asking, “How can we use NetFlow to trouble shoot call quality issues?” Customers are usually shocked when I show them how easy it is to do. First we will need to go over …
Lately in support we have been getting a lot of questions on how to configure Cisco Nexus 7000 switches for NetFlow. The Nexus 7000-M series supports full and sampled NetFlow while the 7000-F series only supports sampled. So now you might be asking, “what is the difference in the two and which one should I …
The cutting edge Cisco 7600 Series is an edge router that delivers robust, high performance IP/MPLS features for service provider and enterprise WAN/MAN applications. There are some common Cisco 7600 NetFlow problems that you should be aware of when enabling Cisco 7600 NetFlow exports.
Good news, with the 7.4 release, the Cisco Wireless LAN Controller will now start exporting Netflow v9 entries. Together with the Cisco Application Visibility & Control innovation, the Cisco Wireless NetFlow support includes features such as:
Read about virtual routing first before reading this post. VRF aware Netflow is available in Scrutinizer since v7 and in IOS starting with 12.4(11)T, however I also saw in some documentation that support for VRF input was added in 15.0(1)M. This is of course via Flexible Netflow. You can set the input VRF as a key …