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How to view the top talkers on a Cisco router using NetFlow

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How to view the top talkers on a Cisco router using NetFlow

Postby admin » Wed Oct 03, 2012 1:49 pm

How to view the top talkers on a Cisco router from the command line using NetFlow

Enable it top talkers with the following commands
ip cef
ip flow-top-talkers
top 10 --> This number can be higher
sort-by bytes

You need to add "ip flow ingress" to each interface the traffic is flowing over.
Then issue the following command

Show ip flow top-talkers



If you get the following results, that means you do not have "ip flow <ingress|egress>" on the ingress and egress ports, or IP CEF is not enabled.
GoatRouter#show ip flow top-talkers
% Cache is empty


You will get something like this if everything is correctly configured.
GoatRouter#show ip flow top-talkers
SrcIf SrcIPaddress DstIf DstIPaddress Pr SrcP DstP Bytes
Se0/0/0 10.1.1.126 Fa0/0 10.3.1.7 11 590F 8CD3 72M
Se0/0/0 10.2.2.210 Fa0/0 10.3.1.18 06 1E78 D76E 1892K

10 of 10 top talkers shown. 369 flows processed.

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