I have a network with 2 routers and 2 ISPs. router A is connected to A T-3, router B has 2 T-1s. I want to configure the 2 T-1s to be backups. The routers are connected to each other.
I bought all my subnets from the T-3 provider, and routing all my traffic across the T-3 works fine. I know I need to setup the 2 T-1s with BGP, this is no problem, I am doing this tonight.
My problem is this: I want to configure it such that if the T-3 goes down, all my traffic gets routed across the T-1s. But I don't normally want the traffic going across the T-1s ( they are slower ). I need to use some routing protocol between my 2 routers such that my default route on router B is going to be the link to router A, except when the T3 on router A fails, then the T-1s become the default route. My question is how do do this? I normally juse use static routes ( as my network did not have multiple paths to anything up until now ). The routers are both Cisco 7000 series running 12.1.1a