01-02-2009 11:30 AM
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?
01-02-2009 12:25 PM
Nope.
Hope that helps.
01-02-2009 01:45 PM
Curious... what type of information are you trying to capture in netflow on a L2 interface?
01-02-2009 03:22 PM
I'm concerned about seeing server to server flows on the same subnet/vlan. Will a L3 vlan interface do the trick?
01-03-2009 03:23 PM
Chris
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.
HTH
Rick
01-04-2009 05:14 PM
Thanks Rick, That clears it up for me.
03-11-2009 10:10 AM
Hi,
on a Cat6500 (Sup720) it is possible to monitor L2 traffic with netflow.
See http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/netflow.html#wp1157805 (Enabling NetFlow for Ingress-Bridged IP Traffic) for details.
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