This Counter32 counts non-unicast packets that higher-layer protocols requested be transmitted out this extended-table interface, including ones that were discarded or never sent. An administrator monitors it to see how much of a port's outbound load is multicast or broadcast traffic rather than ordinary unicast. For example, an unusually high cnt2XIfOutMulticastPkts count on an edge port could reveal an application flooding multicast traffic unnecessarily onto that link.