If the topology is simple then managing static routes can be way easier than doing dynamic routing correctly, otherwise I'd start looking at BGP. Your best opti

If the topology is simple then managing static routes can be way easier than doing dynamic routing correctly, otherwise I'd start looking at BGP. Your best option right now in terms of software is FRR or bird. But first you should understand dynamic routing and decide if it's right for your use case. https://en.wikipedia.org/wiki/Dynamic_routing https://en.wikipedia.org/wiki/Dynamic_routing