We are currently running BGP with one AS Number on a pair of Juniper routers at location A. The two routers are iBGP neighbors directly connecting to each other and they currently advertise the same ARIN /19 address space out to the internet via ISP A1 and A2.
We are adding a new datacenter and 3rd Juniper router at remote location Z and would like to split the existing /19 space to two separate /20s.
We would like the traffic for the first /20 to go to the routers at location A, and traffic for the second /20 to go to the router at location Z
The router at location Z will not be connected to the routers at location A. The router at location Z will be connecting to the internet via ISP Z. The traffic between location A and location Z will routed through the internet
We would like to know if we can use the same ASN to run BGP on both locations. Or do we need another AS to make it work? Any tips on connecting/routing between the two locations is greatly appreciated.