seeing connection bandwidth use?

I’m curious. Is there any way for me to see how much bandwidth a specific connection is using? I can see that one of my CCR’s interfaces is using just about 400mbps, but with more than 50 MACs and several thousand connections, I have no way of figuring out just what connection is using that.

Am I missing something, or is there really no way to see the bandwidth use of an IP connection?

No ideas?