Switch DOES forward unicasts to all it's ports, if the destination MAC-address unknown. It doesn't make indeed much difference in this case, just a nice thing to know.
And never underestimate the power of other peoples reflection. ;) There is a nice feature on Catalyst 6500, for example. If you're configuring vlan access-list you are able to do the following:
action {{drop [log]} | {forward [capture]} | {redirect {interface interface-number}} | {port-channel channel-id} {interface interface-number} | {port-channel channel-id} ...}
where:
forward
Forwards (switched by hardware) the packets to its destination.
capture
(Optional) Sets the capture bit for the forwarded packets so that ports with the capture function enabled also receive the packets.
I dunno, how to enable capture, but the next option looks perfectly suitable for our case too
redirect interface
Redirects packets to the specified interfaces; possible valid values are ethernet, fastethernet, gigabitethernet, tengigabitethernet, pos, atm, and ge-wan.
It's not proved here, but I don't see why shouldn't it work. Yes, it doesn't make a hub from a switch and overweighted, but is able to do the job, if someone desire it so bad. :)
