Traffic Policing And Traffic Shaping Overview; Traffic Policing - Huawei S3700HI Configuration Manual - Qos

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S3700HI Ethernet Switches

Configuration Guide - QoS

2.1 Traffic Policing and Traffic Shaping Overview

This section describes the basic concepts of traffic policing and traffic shaping and the

differences between traffic policing and traffic shaping.

To make full use of limited network resources, perform traffic policing for special service flows

to adapt to the allocated network resources.

Traffic policing monitors the rate limit to limit the traffic and resource usage. It then discards

the excess traffic to limit traffic within a proper range and to protect network resources.

Token Bucket and Traffic Measurement

When the traffic exceeds the rate limit, the S3700 uses traffic control policies. Generally, the

S3700 uses a token bucket to measure the volume of traffic.

A token bucket is considered as a container that stores a certain number of tokens. The S3700

puts tokens at the configured rate (one token bucket can forward one bit of data) in a token

bucket. When the token bucket is full, the excess tokens overflow and the number of tokens no

longer increases.

When measuring the traffic in a token bucket, the S3700 forwards packets based on the number

of tokens in the token bucket. If there are sufficient tokens in the token bucket to forward packets,

the traffic rate is within the rate limit. Otherwise, the traffic rate exceeds the rate limit.

Figure 2-1 Using a token bucket to measure the traffic

Packets that need to be

The S3700 supports the single token bucket and dual token buckets.

Issue 01 (2012-03-15)

sent from this interface

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2 Traffic Policing and Traffic Shaping Configuration

Put tokens into the bucket at

the set rate

Token

bucket

Drop

Continue to send

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