I have a Debian server which has multiple BGP sessions established via BIRD. I'm not trying to make it so that the server acts as router between these sessions (meaning it would redistribute the routes it receives from peers and route incoming traffic from peers to the peer the IPs are announced by).

My config can be found at https://hasteb.in/soxeyago.nginx

As this is a test system the peers are connected via GRE. I have replaced the passwords with PASSWORD GOES HERE.