Load Balance HTTP Redirections

Add each of those server+port combos as a pool member. Put a good health check monitor on them that validates they are up correctly.

server1:9081 server1:9082 server2:9083 server2:9084

Example in version 11

ltm pool /Common/POOL_RANDOM_PORTS {
    description "Multiple servers Multiple Ports"
    members {
        /Common/10.10.10.1:9081 {
            address 10.10.10.1
        }
        /Common/10.10.10.1:9082 {
            address 10.10.10.1
        }
        /Common/10.10.10.2:9084 {
            address 10.10.10.2
        }
        /Common/10.10.10.2:9084 {
            address 10.10.10.2
        }
    }
    monitor /Common/http 
}