H3C Technologies H3C S6300 Series Switches - Manual (Page 24)

14
QoS overview
In data communications, Quality of Service (QoS) provides differentiated service guarantees for
diversified traffic in terms of bandwidth, delay, jitter, and drop rate, all of which can affect QoS.
Network resources are limited. When configuring a QoS scheme, you must consider the characteristics
of different applications. For example, when bandwidth is fixed, more bandwidth used by one user
leaves less bandwidth for others. QoS prioritizes traffic to balance the interests of users and manages
network resources.
The following section describes typical QoS service models and widely used QoS techniques.
QoS service models
This section describes several typical QoS service models.
Best-effort service model
The best-effort model is a single-service model. As the simplest service model, the best-effort model is not
as reliable as other models and does not guarantee delay-free delivery.
The best-effort service model is the default model for the Internet and applies to most network
applications. It uses the First In First Out (FIFO) queuing mechanism.
IntServ model
The integrated service (IntServ) model is a multiple-service model that can accommodate diverse QoS
requirements. This service model provides the most granularly differentiated QoS by identifying and
guaranteeing definite QoS for each data flow.
In the IntServ model, an application must request service from the network before it sends data. IntServ
signals the service request with the RSVP. All nodes receiving the request reserve resources as requested
and maintain state information for the application flow.
The IntServ model demands high storage and processing capabilities because it requires all nodes along
the transmission path to maintain resource state information for each flow. This model is suitable for
small-sized or edge networks, but not large-sized networks, for example, the core layer of the Internet,
where billions of flows are present.
DiffServ model
The differentiated service (DiffServ) model is a multiple-service model that can meet diverse QoS
requirements. It is easy to implement and extend. DiffServ does not signal the network to reserve
resources before sending data, as IntServ does.