Class of Service
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Automatic ingress port oversubscription management (ACX7000)—The ACX7000 family of Cloud Metro Routers support automatic ingress port oversubscription management, also known as priority drop (PRD). When the overall data rate coming from the network exceeds the device's ingress capacity, PRD intelligently discards packets based on priority, determined through packet headers. PRD thus ensures that the device is less likely to drop high-priority and control traffic.
You don't need to configure the PRD feature. PRD is included in ACX7000 routers running Junos OS Evolved 25.1R1 or later.