This read-only PriorityMapMode object reports the priority-mapping scheme (such as 802.1p, DSCP/TOS, or IP precedence) that an Ethernet Network Port uses to classify incoming frames into COS queues. Admins reference it when troubleshooting unexpected QoS classification, since the priority map mode determines which field in the frame the device actually inspects to assign traffic class. For example, if DSCP-marked traffic is being misclassified, an admin would check cmEthernetNetPortPrioMapMode to confirm the port is actually configured to classify on DSCP rather than 802.1p bits that the traffic doesn't carry.