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New Member

Netflow

Hi,

We want to enable netflow on our Core and Server Farm switches. On core we have "Catalyst 6509-SUP2-MSFC2" and on Server Farm we have "Catalyst 4507-SUPIV"

My Question is :

1)Any impact on CPU if enabled netflow

2)is the NAM can be a collector or I need other tools

3)What recommend command to put for enabling netflow

4)Is netflow supported in Catalyst 2950, 2970

Thanks

2 REPLIES
Silver

Re: Netflow

Yes, netFlow does consume additional memory and CPU resources, therefore, it is important to understand the resources required on your router before enabling NetFlow.

To enable netflow, enter into the interface configuration mode of the specific interface with which you want to enable netflow.In that mode, type the following to enable netflow. (config-if)# ip route-cache flow

No, catalyst 2950 and 2970 doesn't support netflow.For more info on netflow, refer the folllowing link.

http://www.cisco.com/application/pdf/en/us/guest/products/ps6601/c1161/cdccont_0900aecd80311f57.pdf

New Member

Re: Netflow

The extra CPU load is minimal as the hard work is allready done by CEF which is hardware based. Obviously the Netflow export adds CPU cycles but the export info is done whhen each session ends, not on a regula basis like SNMP so Netflow is much better than SNMP in this respect.

nTop is an open source Netflow collector which makes nice graphs and detects and flags anomolous host behavours. You can browse to it to get results and if you run it on Linux its free.

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