Make sure that The feature or the mode that performs the similar function of PSPF in Lightweight architecture is called peer-to-peer blocking mode. Peer-to-peer blocking mode is actually available with the controllers that manage the LAP. If this mode is disabled on the controller, which is by default, it allows the wireless clients to communicate with each other through the controller. If the mode is enabled, it blocks the communication between clients through the controller.It only works among the APs that have joined to the same controller. When enabled, this mode does not block wireless clients terminated on one controller from the ability to get to wireless clients terminated on a different controller, even in the same mobility group.