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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Monitoring Cisco Telepresence with NetFlow or in this case Flexible NetFlow is a straight forward process if you have to important factors in place.

1. Configure the Cisco performance reporting. This gets the router to start monitoring Cisco Telepresence.  To do this, the configuration of the router must include certain commands.  Contact us for the command set.
2. Monitoring Telepresence requires a top notch Cisco Performance Reporting tool.

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Cisco Medianet Network Performance Monitoring, we’ve been hearing a lot about this lately.

So how do you know if your router supports it?

The quickest way to find out if a router meets the requirements is to check the Cisco Feature Navigator.  Filter on “performance monitor”, then add the “Performance Monitor (Phase 1)” feature and click Continue.

This will allow you to choose your device to further investigate.  You are given a list of IOS versions that support this feature and the memory/flash required to run it.

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For those of you interested in setting up Cisco Performance reporting via Flexible NetFlow to gain latency insight into your Medianet (E.g. VoIP, Video, etc.), I’ll provide the Flexible NetFlow configuration instructions in this post.

This will allow the Cisco router to export additional characteristics about each flow:

• Jitter: the variation in delay viewed at a particular point compared with the source. Ideally, this value shouldn’t go above 5ms.
• Packet loss: loss of datagrams in the connection
• Transport Event Packet Loss: indicates a loss of an unknown number of a sequential run of packets.
• Round Trip Time: calculated via measuring the time delta between the SYN and the ACK of the TCP flags.

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