Tp And Lr Overview; Traffic Evaluation And Token Bucket; Evaluating Traffic With A Token Bucket - H3C S5500-EI series Operation Manual

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Operation Manual – QoS

H3C S5500-EI Series Ethernet Switches

The precedence is called 802.1p precedence because the related applications of this

precedence are defined in detail in the 802.1p specifications.

2.2 TP and LR Overview

If the traffic from users is not limited, a large amount of continuous burst packets will

result in worse network congestion. The traffic of users must be limited in order to make

better use of the limited network resources and provide better service for more users.

For example, if a traffic flow obtains only the resources committed to it within a certain

period of time, network congestion due to excessive burst traffic can be avoided.

TP is traffic control policies for limiting traffic and resource usage by supervising the

traffic. The prerequisite for TP is to determine whether or not the traffic exceeds the set

threshold. Traffic control policies are adopted only when the traffic exceeds the set

threshold. Generally, token bucket is used for evaluating traffic.

2.3.1 Token Bucket

A token bucket can be considered as a container with a certain capacity to hold tokens.

The system puts tokens into the bucket at a pre-set rate. When the token bucket is full,

the extra tokens will overflow and the number of tokens in the bucket stops increasing.

Packets to be sent

through this port

Figure 2-4 Evaluate traffic with a token bucket

The evaluation for the traffic specification is based on whether the number of tokens in

the bucket can meet the need of packet forwarding. If the number of tokens in the

bucket is enough to forward the packets, the traffic is conforming to the specification;

otherwise, the traffic is nonconforming or excess.

Put tokens in the bucket at the

classification

Chapter 2 Traffic Classification,

TP, and LR Configuration

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