Multiple AS on single router, possible?

RouterOS Forwarding Protocols
1

I’m peering with two upstream providers on two different ASes and provide merged bandwidth to other networks in downstream.I know it can be configured using multiple instances with different/desired AS assigned. But my question is how routes from different instance/AS are merged/managed on RouterOS. How this will be different from dedicated router for each AS and another BGP session in between them. I’d like to mention, since this is a co-location, I’ve to pay for additional space to install additional devices.

Thank you.
BGP_Diagram.png

2

BGP Best path selection algorithm is not used in this case. Best route is picked by other means, like distance.

3

Thank you very much for responding.

One more thing I’d like to clarify, any traffic originating from any of the downstream ASes destined towards AS111111 will have both the ASes in the AS path.. right?

thank you,

4

To answer that question please show setup. If you have two AS and if you do wish this to be scalable then i would recommend you to invest in two routers at a minimum one for each as.
Remember that with this investment it would be wiser to have the two connections in two routers in the same AS anyway then you are building with redundancy from the start. You may grow in to the other as well when ever you need to. This is usually not a problem, if the need is there it is probably backed by paying customers hence the money to invest further is a no brainer.