In this blog I will be discussing how to configure Cisco 6500 Sup2T NetFlow. The Cisco 6500 Supervisor Engine 2T exports Flexible NetFlow, so your old Cisco 6509 NetFlow configuration will no longer be compatible with this setup.
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Cisco 6509 NetFlow problems and recent improvements will be the main focus in this blog. Since the reporting accuracy of your NetFlow or Flexible NetFlow Analyzer could also depend on the quality of the exported data, hopefully discussing some of the major NetFlow problems with 6500 series will help us better understand how exactly reporting on these switches works. I will also take this opportunity to highlight improvements made in the sup 2T. Read more »
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Welcome to the first installment of our NetFlow v9 Overview, beginning (of course!) with NetFlow basics.
What is NetFlow?
A network flow is defined as a unidirectional sequence of packets between given source and destination endpoints. Traditional NetFlow uses a 7-tuple of source and destination IP address, transport layer port numbers, IP Protocol, Type of Service (ToS), and the input interface port to uniquely identify flows. Flexible NetFlow (FNF) is a ground-up rewrite of NetFlow which allows the user to customize the NetFlow tuple to include (or exclude) a nearly infinite amount of different fields.
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Our Network security solution is a leader in cutting edge NetFlow collection innovation; here are top 13 features you should know about:
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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:
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Are you having trouble exporting encrypted NetFlow traffic over your IPsec tunnel? When using a IPsec encrypted VPN, packets transferred are required to have the same output features of the tunnel; namely QoS and Encryption. Only if the output features are applied on the packets will they be sent to the destination over the VPN. This post will tell you how to get the data you want. Read more »
Jimmy WendlerFor a free 30 day trial of Scrutinizer, Download Now!
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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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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 field in the NetFlow record, then use the VRF ID to filter reports based on that VRF in scrutinizer.
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I haven’t seen it pop up yet but, I think debates over Cisco Vs. Huawei will eventually rise and when it does, will NetFlow and IPFIX reporting be important factors? It is too early to tell however, I do know where both companies stand in regard to flow exports.
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