Can it be done? I know the 5510's can do it with the "Interface Redundtant #" command and putting your two interfaces in the group that it creates so that when one fails, it will failover to the other in the group.

I'm wanting to do this with a few 5505's that I have and the command isn't supported on the 5505's. I have 2 backhaul links out to a site(100mb and a 54mb link) and I'd like to be able to failover to the slower link if the primary fails. I know the 5505 will do active standby/dual ISP but I'm not sure how to apply it to this situation as both links would be connected to the same subnet/link back into the same network. If that makes sense.

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The best part about telling UDP jokes is I don't really care if you get them or not.

It doesn't seem like it's possible or I'm completely missing it. All the documentation seems to point towards supporting a dual ISP setup where the backup(failover) interface(vlan) is in a different subnet than the primary along with setting up a backup route etc.

Only other option I can think of is to plug the 2 radio links into the switch first vs the asa and use spanning tree to do the failover. Plug the outside interface into a vlan that both of the radio links are plugged in to, then plug asa inside interface into another port on the switch to trunk out phones and computer for the building.

Would prefer to use an ASA at the remotes sites so I can vpn tunnel back to the core 5550 to add an extra layer of encryption.

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The best part about telling UDP jokes is I don't really care if you get them or not.

You can do a port-channel (EtherChannel) in ASA 8.4.x.

only at the 5510's and above

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The best part about telling UDP jokes is I don't really care if you get them or not.

Ah, bunk. I did not know that, thanks.

Anybody else have any idea how to approach it, or is that just the best way to handle it?

I know when I have put in a redundant path back to the core through another building I can create a separate subnet/route between the 2 asa's and use the dual WAN failover then, but when the redundant path is back to the same network/switch it seems using spanning tree is the best way to make it work.

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The best part about telling UDP jokes is I don't really care if you get them or not.