Our current environment is configured as follows and is in the attached image. We have two routers on the front end that are running BGP with three different ISP's. Each ISP connects to a different interface on our routers. The ISP interfaces use ISP supplied /30 IP's. Our existing ARIN IP block is advertised out BGP and assigned to the inside interface of each router. We run iBGP and GLBP on the routers inside interfaces. We are close to using up our /24 block of ARIN assigned IP's. We have received a new /24 block of ARIN assigned IP's that we want to use along with the existing /24 block. What is the best way to add the new /24 block of IP's to our routers? Do I need to assign them as a second IP to each router's inside interface? Or, can I just advertise the new block out of BGP and add a static route to route the new block out the inside interfaces and not assign any secondary IP's to the inside interfaces?