iRule effect ?

Is this irule effecting persistence if a applied to some VIP ?

when LB_SELECTED {
   It checks whether the IP address is within the class group preloaded with
   IP addresses that need to validate, you can put host or network

  if { [class match [IP::client_addr] equals "source_ip_addr" ] } {
     Is written to the log for review by ssh with the following command:
     tail -f /var/log/ltm
    log local0. "Source Ip Adress [IP::client_addr], Server Selected [LB::server]"
  }
}