issues enable IP accounting

[network770]

I have a 6500 and I would like to enable IP accounting on a wan interface.  I have done the following on the interface level

C6K(config-if)#ip accounting output-packets

and the switches gives me :

Accounting will exclude mls traffic when mls is enabled.

then when I do sh ip accounting I see nothing.  why?

How do I see all traffic going in & out of a given interface?

[Edison Ortiz]

ip accounting is not supported on that box.

if you want to capture traffic, please deploy and configure NetFlow.

Regards,

Edison

[network770]

IP accounting is not supported a C6500? are you serious?

If that is the case do would Netflow get me the top talkers?

How do I configure it on a 6500?