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S12700 V200R013C00 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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Application Scenarios for Congestion Avoidance and Congestion Management

Application Scenarios for Congestion Avoidance and Congestion Management

Congestion Management

Congestion management is often deployed in QoS applications to schedule different services based on priorities.

On a network, when multiple services compete for the same resources (such as the bandwidth and buffer), traffic congestion may occur. High-priority services may not be processed in a timely manner.

Figure 5-10 shows a network implementing congestion management. Packets are sent to different queues according to the result of priority mapping. To implement differentiated services, different scheduling modes are set in the outbound direction.

Figure 5-10  Network implementing congestion management

Congestion Avoidance

When congestion occurs or worsens, congestion avoidance discards low-priority packets to relieve network overload and ensure forwarding of high-priority packets.

In Figure 5-11, different LAN users may obtain data from the same server. Data exchanged between the server and users goes through the wide area network (WAN).

WAN bandwidth is lower than LAN bandwidth, so congestion may occur between the WAN and LAN.

Congestion avoidance is configured on an edge device to discard low-priority packets, such as data packets. It reduces network overload and ensures forwarding of high-priority services.

Figure 5-11  Network implementing congestion avoidance

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Updated: 2019-04-08

Document ID: EDOC1100065653

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