Traffic Classification Overview - H3C S3610-28P Operation Manual

Operation Manual – QoS
H3C S3610&S5510 Series Ethernet Switches
Chapter 2 Traffic Classification, TP, and TS
When configuring traffic classification, TP, and TS, go to these section for information
you are interested in:

Traffic Classification Overview

TP and TS Overview
Traffic Evaluation and the Token Bucket
TP and TS Configuration
2.1 Traffic Classification Overview
2.1.1 Traffic Classification
Traffic classification is to identify packets conforming to certain characters according to
certain rules. It is the basis and prerequisite for proving differentiated services.
A traffic classification rule can use the precedence bits in the type of service (ToS) field
of the IP packet header to identify traffic with different precedence characteristics. A
traffic classification rule can also classify traffic according to the traffic classification
policy set by the network administrator, such as the combination of source addresses,
destination addresses, MAC addresses, IP protocol or the port numbers of the
applications. Traffic classification is generally based on the information in the packet
header and rarely based on the content of the packet. The classification result is
unlimited in range. They can be a small range specified by a quintuplet (source address,
source port number, protocol number, destination address, and destination port
number), or all the packets to a certain network segment.
Generally, the precedence of bits in the ToS field of the packet header is set when
packets are classified on the network border. Thus, IP precedence can be used directly
as the classification criterion inside the network. Queue techniques can also process
packets differently according to IP precedence. The downstream network can either
accept the classification results of the upstream network or re-classify the packets
according to its own criterion.
The purpose of traffic classification is to provide differentiated services, so traffic
classification is significant only when it is associated with a certain traffic control or
resource assignment action. The specific traffic control action to be adopted depends
on the phase and the current load status. For example, when the packets enter the
network, TP is performed on the packets according to CIR; before the packets flow out
of the node, TS is performed on the packets; when congestion occurs, queue
Configuration
2-1
Chapter 2 Traffic Classification, TP, and TS
Configuration