Operation Manual – QoS-QoS Profile
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
QoS Configuration
1-1
Chapter 1 QoS Configuration
1.1 Overview
QoS (Quality of Service) is a concept generally existing in occasions with service
supply and demand. It evaluates the ability to meet the need of the customers in service.
Generally, the evaluation is not to grade precisely. Its purpose is to analyze the
conditions where the service is the best and the conditions where the service still needs
improvement and then to make improvements in the specified aspects.
In an internet, QoS evaluates the ability of the network to deliver packets. The
evaluation on QoS can be based on different aspects because the network provides
various services. Generally speaking, QoS is the evaluation on the service ability to
support the core requirements such as delay, jitter, and packet loss ratio in the packet
delivery.
1.1.1 Traffic
Traffic means service traffic; that is, all the packets passing the switch.
1.1.2 Traffic Classification
Traffic classification means identifying packets that conform to certain characteristics
according to certain rules.
A classification rule is a filter rule configured to meet your management requirements. It
can be very simple. For example, you can use a classification rule to identify traffic with
different priorities according to the ToS field in the IP packet header. It can be very
complicated too. For example, you can use a classification rule to identify the packets
according to the combination of link layer (Layer 2), network layer (Layer 3), and
transport layer (Layer 4) information including MAC addresses, IP protocols, source
addresses, destination addresses, port numbers of applications, and so on.
Classification is generally based on the information in the packet header and rarely
based on the packet contents.
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