Active and passive node

Hi guys,

Lets say i have Node 1 and Node 2.

And 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.

Can we make Node1 as primary Node and then if primary is down make the second Node2 should be active node.

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.

Best regards,

Malika