I have a problem.
I'm an AS internet provider and i have my public IPs.
I have two internet "backbone" and i can use my public IPs on these two.
But i have to use the first's backbone only for a range of my IPs ( from 1 to 100 ) and use the second's for the other IP ( from 101 to 254 ).
I have a routed network with ospf for "intra-routing" and BGP for routing with the other AS.
I have a router that divide my network from the two backbone and i use policy routing for choose the correct. I have some other router from this gateway and the other provider.
Now i have to make an automatic system for route to the available backbone if one of this go down.