In short, as Edison said, NetFlow will be a better option. And yes, NetFlow can give you information on top talkers, applications, port, protocol, etc. Unlike IP Accounting, you will probably need a NetFlow collector and analyzer software for better visibility and understanding of NetFlow data. A NetFlow configuration sample for the Cisco 6500 is as below:
mls netflow // This enables NetFlow on the Supervisor.
mls nde sender version 7
mls aging long 64 // This breaks up long-lived flows into (roughly) one-minute segments.
mls aging normal 32 // This ensures that flows that have finished are exported in a timely manner.
If you have Supervisor Engine 720, you need to execute the below two commands to put the interface information in the netflow packets.
mls flow ip interface-full
mls nde interface
The next two commands will help to enable NetFlow data export for bridged traffic which is optional. You can specify the list of VLANs here to enable bridged traffic.
ip flow ingress layer2-switched vlan
ip flow export layer2-switched vlan
You can also find more information about these commands in the following Cisco link:
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