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S12700 V200R010C00 Configuration Guide - QoS

This document describes the configurations of QoS functions, including MQC, priority mapping, traffic policing, traffic shaping, interface-based rate limiting, congestion avoidance, congestion management, packet filtering, redirection, traffic statistics, ACL-based simplified traffic policy, and HQoS.

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What Is the Queue Scheduling Mechanism on an Interface?

What Is the Queue Scheduling Mechanism on an Interface?

Eight queues are configured for a physical interface. Queue 7 is of the highest priority, whereas Queue 0 is of the lowest priority. A smaller queue number represents a lower priority. Interfaces on the device support PQ, WRR and WDRR, PQ+WRR, and PQ+WDRR scheduling.

In PQ+WRR and PQ+WDRR scheduling, the device first schedules packets in PQ queues. During PQ scheduling, the device first schedules packets in the queue with the highest priority, and then schedules lower-priority queues. After PQ scheduling is complete, the WRR or WDRR scheduling is performed.

When scheduling packets in WRR or WDRR queues, the device allocates committed bandwidth to each queue, and then schedules packets in WRR or WDRR queues according to their weights.

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Updated: 2019-12-28

Document ID: EDOC1000142089

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