Deploying Qos In A Network; Qos Processing Flow In A Device - H3C WX5500H series User Configuration Manual

Deploying QoS in a network

Figure 2 Position of the QoS techniques in a network
Traffic direction
Traffic classification
Traffic policing
As shown in
functions:
• Traffic classification—Uses match criteria to assign packets with the same characteristics to
a traffic class. Based on traffic classes, you can provide differentiated services.
• Traffic policing—Polices flows and imposes penalties to prevent aggressive use of network
resources. You can apply traffic policing to both incoming and outgoing traffic of a port.

QoS processing flow in a device

Figure 3 briefly describes how the QoS module processes traffic.
Traffic classifier identifies and classifies traffic for subsequent QoS actions.
1.
The QoS module takes various QoS actions on classified traffic as configured, depending on
2.
the traffic processing phase and network status. For example, you can configure the QoS
module to perform traffic policing for incoming traffic.
Figure 3 QoS processing flow
Packets received
on the interface
Packets sent
out of the
interface
Traffic policing
Traffic policing Traffic policing
Figure 2, traffic classification and traffic policing mainly implement the following
Tokens
Classify
packets
Token bucket
Classification Traffic policing
Tokens
Drop
Classify
packets
Token bucket
Classification
Traffic policing
WAN
Drop
CAR Mark
Priority marking
Other
CAR
actions
Send
18
Other
actions