Question : Problem: Enabling top talkers on core switch 4507

how do I enable it? I set it up, but it says ip flow not enabled

Answer : Problem: Enabling top talkers on core switch 4507

Looks like this might be more applicable:

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/12.2/20ew/configuration/guide/nfswitch.html

Thing is though it looks like you need a WS-F4531 (Netflow Feature Card).