The Set level f4m should contain two URLs for each rendition. The first URL should point to the Load Balancer of the Primary Data Center (reverse-proxy-ip1). The second URL should point to the Load Balancer of the Backup Data Center (reverse-proxy-ip2). The Load Balancer at each data center sends stream-level f4m requests to the origin servers of the corresponding Data Center in a round-robin manner. Unlike stream-level m3u8 requests that must have a sticky session, you can safely route stream-level f4m requests to various origin servers in a data center in a round robin manner.