F5 LTM and active , passive node configuration

Hi guys, Lets say i have Node 1 and Node 2. i do want f5 ltm to monitor both but at any given time we want only one server to be active and other to be passive. We want this to happen this way as we have some replication process agent between running between these servers. Can we make Node1 as primary Node1 and then if primary is down make the second Node2 should be active node. Not a round robin deployment. Can we achieve this via configuration or do I need to write Irules. If so can some one share how to implement or configure this at the virtual server. Regards Sunil Prabha