I’m new to BGP and have a relatively simple question, or so I think it is for you BGP veterans. I would like to build two new seperate edge networks at my company; one for production services and another for non-production services. We own a large public IP block and one ASN right now. Each edge network needs redundant ISP connections in a multihomed BGP setup across two routers with iBGP between them for high availability. Mapped out like this across 4 routers:
Router 1 - ASN X - advertise X.X.X.X/23 -> ISP A Circuit 1
Router 2 - ASN X - advertise X.X.X.X/23 -> ISP B Circuit 1
Router 3 - ASN ? - advertise Y.Y.Y.Y/23 -> ISP A Circuit 2
Router 4 - ASN ? - advertise Y.Y.Y.Y/23 -> ISP B Circuit 2
What ASN should I use in my non-production network to maintain separation? Can I use the same ASN as my production network and achieve the separation through an advanced configuration? Or should I request a second ASN from my regional Internet registry? Would the RIR even give me a second ASN?
Looking for guidance here. Thanks!