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See matching posts in thread - My company is a small service provider...
Juniper Networks EX Series Ethernet Switches support Differentiated Service Code Point (DSCP) or IP precedence and IEEE 802.1p CoS classifiers on the customer-edge interfaces of the ingress provider edge (PE) switch
Class of service (CoS) is the assignment of traffic flows to different service levels. Service providers can use router-based CoS features to define service levels that provide different delay, jitter (delay variation), and packet loss characteristics to particular applications served by specific traffic flows