H3C WX Series Configuration Guide

24
2 QoS overview
In data communications, Quality of Service (QoS) is the ability of a network to provide
differentiated service guarantees for diversified traffic regarding bandwidth, delay, jitter,
and drop rate.
Network resources are always scarce. The contention for resources demands that QoS
prioritize important traffic flows over trivial traffic flows. When making a QoS scheme, a
network administrator must consider the characteristics of various applications to
balance the interests of diversified users and fully utilize network resources.
The subsequent section describes some typical QoS service models and widely used
mature QoS techniques.
NOTE:
The interfaces on your access controller may appear different in type and number from the GE
interfaces used in the examples in this manual.
To ensure that the precedence mapping function can operate properly, use the undo l2fw
fast-forwarding command to disable Layer-2 fast forwarding. For more information about
Layer 2 fast forwarding, see Layer-2 Forwarding in the Layer 2 – LAN Switching Configuration
Guide.
QoS service models
The three typical QoS service models are:
Best-effort service model
IntServ model
DiffServ model
Best-effort service model
Best effort is a single service model and also the simplest service model. In the best effort
service model, the network does its best to deliver packets but does not guarantee
delay or reliability.
The best-effort service model is the default model in the Internet and applies to most
network applications. It uses the first in first out (FIFO) queuing mechanism.

H3C WX Series Specifications

General

Brand	H3C
Model	WX Series
Category	IP Access Controllers
Language	English