Load Balancing issue - Source Address Persisantence

with source Ip address peristence, you must take care of the netmask, as the persistence record is created based on that. If 2 IPs (let's say 10.1.1.10 and 10.1.2.20) are in the same defined netmask (for ex. 255.255.0.0), they will both use the same persistent record and hence, be using the same backend server. You can check the created persistent record with command

tmsh show ltm persistence persistence-records

At application layer, we have two managed server like TCP 7011,TCP 7012. So in this case i need for TCP 7011 App1 as primary and App 2 as secondary, similarly for TCP 7012 App2 as primary and App1 as secondary. I believe this can be achieved through irule, can you please help on this.

Hey Suresh, on what port is the webserver sending request to. Is the flow like

Webserver -------> Virtual Server -----Pool Members (App1:7011, App2:7012)

You might want to give try as:

when LB_SELECTED {
    if {[LB::server port] eq 7011 } {
        if {[LB::status pool xyz_pool member x.x.x.x 7011] equals "up"} {
            node x.x.x.x 7011
        }
        elseif {[LB::status pool xyz_pool member y.y.y.y 7011] equals "up"} {
            node y.y.y.y 7011
        }
      }

     elseif {[LB::server port] eq 7012 } {
            if {[LB::status pool xyz_pool member y.y.y.y 7012] equals "up"} {
            node y.y.y.y 7012
            }
            elseif {[LB::status pool xyz_pool member x.x.x.x 7012] equals "up"} {
            node x.x.x.x 7012
        }
    }
}


x.x.x.x - app1
y.y.y.y - app2