The COS assigned to a frame that does not have a valid COS identifier for the Priority Map Mode of the port. This attribute is only applicable on products when Flowpoint Model is supported. This value is assigned to a frame received on a port when: - the cmEthernetNetPortPrioMapMode=priomap-8021p, ingressCOSPriority=inner-vlantag; and the frame is untagged - the cmEthernetNetPortPrioMapMode=priomap-8021p, ingressCOSPriority=inner-vlantag; and the frame has a single VLAN tag - the cmEthernetNetPortPrioMapMode=priomap-8021p, ingressCOSPriority=outer-vlantag; and the frame is untagged - the cmEthernetNetPortPrioMapMode=priomap-dscp; and the frame does not have an IP ethertype - the cmEthernetNetPortPrioMapMode=priomap-tos; and the frame does not have an IP ethertype. This attribute has been deprecated and is not supported. The Default COS is determined from the flowpoint's associated Priority Mapping Profle.