I have the attached diagram that I need to create a DR scenario for. I've tested this in a lab, but I wanted to get your opinions.
The 10.10.10.0/24 network is our corporate subnet. If the link between AS1 and AS4 (AT&T) goes down, I want the system behind AS3 to be able to get rerouted for the 10.10.10.0/24 subnet to AS2. I thought that I would be able to have the same network over there, but not advertising it.
Second problem that I just thought of is that if it was configured that way, then the users behind AS2 would always try to hit the "local" 10.10.10.0/24 subnet which isn't what I want.
I need help with the DR scenario because we're starting a huge project with another site that we have, and I'd like to see if I can get this to work.
So far what I've done is create a floating route on AS3 for when the 10.10.10.0 drops from the table. While this works, it takes a while for it to drop out of the table. That can be a good or bad thing because I don't necessarily wanting traffic redirected to another site because of a small blip.