iRule to direct traffic to a specific node in a pool?

You can create a pool for the "time_entered" server and a pool for the "vacation_time" server. You could then create a rule that selects the correct pool based on whatever logic you have. Then create a virtual server which points to the rule.

The advantage to using a pool is that you can change the pool membership without having to modify the rule.

The rule might look something like this:

if {$some_condition==1}{
   pool time_entered_pool
} elseif {$some_other_condition==1}{
   pool vactaion_time_pool
} else {
   
}

If you provide more detail on what the criteria for the selection is, I can give you a closer example.

Aaron