This value defines what the router does with IPX traffic matching this filter rule's source and destination addresses, choosing between discarding it entirely, forwarding it normally, or forwarding it with a low or high priority marking. An admin sets this to build access control or QoS-style policies for IPX traffic between specific network segments. For example, setting this to discard(1) for a rule matching traffic between two specific IPX networks would block all data flowing between them, while priority-high(4) would forward matching traffic with elevated priority handling.