Router on a stick and broadcasts

I have a router on a stick config (Cat 2950 to a 1650). The 2950 has two VLANs - A and B. B is a vendor VLAN that sends frequent directed broadcasts to VLAN A's brodcast address.

So the directed broadcast would come into the 2950, go up the trunk link, to the router, then out to VLAN A (back through the switch). I am seeing massive amounts of broadcasts being received on the router's trunk link.

When the directed broadcast gets passed on to the switch, the switch forward it out to all hosts on that VLAN. Does this include forwarding it back to the router over the trunk link?

Also - how does a switch handle the broadcast? Does it look for all hosts in it's CAM table and send the packet out to those, or does it just send it out all ports?

Thanks!