Next Pool option

Hi! I’m running the 2.1.11 version and I would like to know how to configure next-pool options in the ippool file in order to get a ip from a secondary pool when the first pool is starved. Let’s say I have two pools, 172.16.1.0/24 and 192.168.10.0/24 and I want that as soon as the 172.16.1.0 range is empty, the Radius start giving addresses form the 192.168.10.0 pool. Is it possible? Thanks in advance.