You cannot assign IP's of the same subnet to two different interfaces of the ASA in the routed mode. So as per your diagram, you cannot connect Inside interface of the ASA to both the 6504E switches or to the DMZ switches as you have shown. If you want to do such a failover, you can use 2 ASA's with Active/Standby failover while connecting ASA-1 to 6504EGa and ASA-2 to 6504EGb. You can also do Active/Active failover.
Also with 1 ASA, if you want to configure 2 ISP's on 2 interfaces, please remember policy based routing is not supported on ASA so at any gien time only 1-ISP will be active for all the traffic going out. You can have the failover configured so that everything fail's over to the secondary ISP when Primary goes down with tracks etc.
I hope this helps. If not, can you please post your exact requirements for the failover so that we can suggest you better.
I want to know what is"resilient interface" in single ASA design. Yes as u said we can't assign same subnet for 2 interfaces, i guess etherchannel is also not possible. Only Interface failover is possible. Do let me know how this is config in my setup.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...