VMG1312-B Series User’s Guide 167
CHAPTER 10
Quality of Service (QoS)
10.1 Overview
Quality of Service (QoS) refers to bot h a net work’s abilit y to deliver dat a with m inim um delay, and
the networking m et hods used t o control the use of bandwidth. Wit hout QoS, all traffic dat a is
equally likely to be dropped when t he network is congest ed. This can cause a reduction in network
perform ance and m ake t he netw ork inadequate for t im e- critical applicat ion such as video-on-
dem and.
Configure QoS on t he Device to group and prioritize applicat ion t raffic and fine- tune net work
perform ance. Set t ing up QoS involves t hese steps:
1 Configure classifiers t o sort t raffic into different flows.
2 Assign priority and define act ions t o be perform ed for a classified traffic flow.
The Device assigns each packet a priority and then queues the packet accordingly. Packet s assigned
a high priority are processed m ore quickly t han those with low priority if t here is congestion,
allowing t im e-sensitive applications to flow m ore sm oot hly. Tim e- sensitive applicat ions include bot h
those that require a low level of latency (delay) and a low level of jit t er ( variations in delay) such as
Voice over I P (VoI P) or I nternet gam ing, and t hose for which jit ter alone is a problem such as
I nternet radio or st ream ing video.
This chapt er cont ains inform at ion about configuring QoS and editing classifiers.
10.1.1 What You Can Do in this Chapter
• The Ge ne ra l screen lets you enable or disable QoS and set t he upstream bandwidth (
Sect ion
10.3 on page 169
) .
• The Queue Set up screen let s you configure QoS queue assignm ent (
Section 10.4 on page 170) .
• The Cla ss Set up screen let s you add, edit or delete QoS classifiers (
Section 10.5 on page 172) .
• The Policer Set u p screen lets you add, edit or delet e QoS policers (
Section 10.5 on page 172).
• The Monit or screen let s you view t he Device's QoS- relat ed packet st atistics (
Section 10.7 on
page 179
) .
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