Sure. I believe logging level 6 (Informational) will output connections that are built or broken down. For e.g.
Oct 01 10:10:10 *.*.*.* Oct 01 10:10:10: %ASA-6-10212: Teardown TCP connection 5383932 for outside:*.*.*.*/80 to inside:*.*.*.*/1213 duration 0:00:01 bytes 1226 TCP FINs
As you can see, the above one includes the total number of bytes for that constructed connection and so by performing a field extraction on that you could build up bandwidth usage, you wouldn't necessarily need to use the CSS (Cisco Security Suite) but could easily build something like this yourself.
If you wanted more detail on that then feel free to ask 🙂
... View more