i have successfully tested interface failover in version 8.0 of the ASA code; used with 2 switches to help in the event of switch failure
but given i currently use all 4 interfaces (outside, inside, DMZ1, DMZ2) i would require a total of 8 to provide full interface redundancy in this case
clearly i could buy a 4 port module in this case but i was wondering if there is any other way of doing it;
possibly using a trunk link for all 4 vlans into gigabitethernet0/0 and using gigabitethernet0/1 as the redundant interface for the trunk link of the 4 vlans.
is this possible? is there a more obvious solution than this?