I'm looking to move from our single ISP to a dual ISP. Now I'm quite new to this so my query might be a little basic.
Currently the IP block we have is tied to our ISP (ISP1) to which we run a bgp session (the ISP provides us a default route via bgp). Now I'd like to add a second different ISP (ISP2) that also runs bgp, how would I go about routing my current ISP1 IP's with ISP2 given that the IP block belongs to ISP1 although we have been assigned those blocks by ISP1?
Is there anything I need to do with RIPE or with getting an AS number?
Any insight would be appreciated.