With the class-of-service (CoS) features on a Services Router, you can assign service levels with different delay, jitter (delay variation), and packet loss characteristics to particular applications served by specific traffic flows. CoS is especially useful for networks supporting time-sensitive video and audio applications. To configure CoS features on a Services Router, see Configuring Class of Service with DiffServ.
This overview contains the following topics. For more information about CoS and DiffServ, see the JUNOS Network Interfaces and Class of Service Configuration Guide.