I currently have my backbone setup with OSPF and it works great. Now I need to add another border router into the network that is connected to another provider. Of course the new provider is giving us new IPs. I can subnet the new IPs and place them on the mountain top/backbone routers. This will allow the customers to switch over to the new IPs at their leisure. But how do I make the new IPs go out the new provider only and the old IPs go out the old provider only?