The command PE-A(config-pmap-c)#set dscp ef is used to apply DSCP marking to the traffic matched by the class-map. DSCP marking is a part of QoS policy to prioritize traffic. The ‘ef’ (Expedited Forwarding) value is commonly used for voice traffic to ensure it receives high priority and low delay through the network.
[: For more information, refer to the QoS section in the Implementing and Operating Cisco Service Provider Network Core Technologies (SPCOR) course materials., ]
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