Major Traffic Control Technologies - H3C S5100-SI Series Operation Manual

their regional branches together with VPN technologies to carry out operational
applications, for instance, to access the database of the company or to monitor remote
devices through Telnet.
These new applications have one thing in common, that is, they all have special
requirements for bandwidth, delay, and jitter. For example, videoconference and VoD
require high bandwidth, low delay and jitter. As for mission-critical applications, such as
transactions and Telnet, they may not require high bandwidth but do require low delay
and preferential service during congestion.
The emerging applications demand higher service performance of IP networks. Better
network services during packets forwarding are required, such as providing dedicated
bandwidth, reducing packet loss ratio, managing and avoiding congestion, regulating
network traffic, and setting the precedence of packets. To meet these requirements,
networks must provide more improved services.

1.1.4 Major Traffic Control Technologies

Figure 1-1 End-to-end QoS model
As shown in
management, and congestion avoidance form the foundation for differentiated service
provisioning. They deal with different issues of QoS:
Traffic classification identifies traffic based on certain match criteria. It is the
foundation for providing differentiated services and is usually applied in the
inbound direction of a port.
Traffic policing confines traffic to a specific specification and is usually applied in
the inbound direction of a port. You can configure restriction or penalty measures
against the exceeding traffic to protect carrier benefits and network resources.
Traffic shaping adapts output traffic rate, usually to the input capability of the
receiving device, to avoid packet drop and port congestion. Traffic shaping is
usually applied in the outbound direction of a port.
Figure 1-1, traffic classification, traffic policing, traffic shaping, congestion
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