Can Netflow collect statistics on layer2 interfaces?

Unanswered Question
Jan 2nd, 2009
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I have enabled netflow on a 6513 running 12.2(33)SXH2a. Right now it is collecting statistics for layer3 interfaces only. Can Netflow be configured to collect statistics for layer2 interfaces?

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Overall Rating: 5 (1 ratings)
letsgomets Fri, 01/02/2009 - 13:45
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Curious... what type of information are you trying to capture in netflow on a L2 interface?

cchughes Fri, 01/02/2009 - 15:22
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I'm concerned about seeing server to server flows on the same subnet/vlan. Will a L3 vlan interface do the trick?

Richard Burts Sat, 01/03/2009 - 15:23
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If the server to server flows are on the same subnet/vlan then the servers communicate directly with each other - from a layer 3 perspective. (frames do come in one layer 2 switch port and exit another layer 2 switchport - so in a layer 2 perspective the 6500 does see them) From a layer 3 perspective the 6500 does not see that traffic. And NetFlow reflects what the router/switch sees at layer 3. So I do not believe that it is possible to see what you want with NetFlow.




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