Take a look at this beautiful network topology I have laid out here. Question is at the end.
I need a way for R1 and R2 to route to the internet through ASA1 normally,
and through ASA2 if ASA1 fails.
Would it be ok to have ASA1 and ASA2 both advertise 0.0.0.0 and just forward to the gateway? So, lets say under normal circumstances, R1 routes to ASA1 to get to the internet. Then if ASA1 fails, the routers are updated with the link no longer being active and then will accordingly route to ASA2. Is this the correct way to do this?