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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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Overview

Overview

Traffic policing, traffic shaping, and interface-based rate limiting can control the traffic rate to improve network resource utilization and provide better services.

Network congestion may occur when the transmit rate is higher than the receive rate or the interface rate on a downstream device is lower than the interface rate on an upstream device. If rates of traffic sent from users are not limited, continuous burst traffic from many users worsens network congestion. To deliver better services to users leveraging limited network resources, user traffic rates must be limited.

Traffic policing, traffic shaping, and interface-based rate limiting are mechanisms to monitor and control traffic rates and resource usage.

Traffic Policing

Traffic policing monitors the rate of traffic entering a network and discards excess traffic to keep the incoming traffic rate within a specified range, thereby conserving network resources and protecting user resources.

Traffic Shaping

Traffic shaping adjusts the traffic rates to enable traffic to be transmitted at an even rate, preventing congestion on the downstream device.

Interface-based Rate Limiting

Interface-based rate limiting controls the total rate of all packets sent or received on an interface. This mechanism can simplify configuration when you want to limit the rate of all traffic on an interface regardless of packet types.

Relevant Information

Technology Forum

QoS Issues - Issue 4 QoS Implementation - Rate Limiting

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Updated: 2019-12-28

Document ID: EDOC1000142089

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