Since the 5505 doesn't support redundant interfaces I am having some design problems with making the 5505 redundant to the inside of the network. General layout is that there are several 5505's that tie into a single 6500. I would like for them to tie into a second 6500 hundred for the same subnet, i.e. vlan 10 on both interfaces on the inside. I know the 5505 doesn't support spanning-tree also. Also there is nothing layer 3 on the inside other than the inside interface gateway of the ASA itself via a SVI. Would the best option be to tie those 5505's into another switch that multi-homes into the 6509s? The goal here is two keep it so that if a single 6500 fails all services stay up and online.