How can I set the route domain in an iRule?

Hi,

you can try this irule:

when ACCESS_POLICY_COMPLETED {
   if { ([ACCESS::policy result] equals "allow") } {
      set ou [ACCESS::session data get "session.ad.last.attr.ou"]
      set route_domain [class match -value $ou equals BU_RD_DG]
      ACCESS::session data set "session.network.name" $route_domain
   } 
}

When using APM with irule, it is better to use events ACCESS_POLICY_COMPLETED and ACCESS_POLICY_STARTED instead of irule policy event.

in you case, ACCESS_POLICY_COMPLETED is the best event as it raise once at the end of policy evaluation.