User's Manual

Chapter 9 Quality of Service (QoS)
B222s User’s Guide
84
QoS versus Cos
QoS is used t o priorit ize source-t o-dest ination t raffic flows. All packet s in the sam e flow are given
the sam e priorit y. CoS ( class of service) is a way of m anaging t raffic in a network by grouping
sim ilar t ypes of t raffic together and t reat ing each ty pe as a class. You can use CoS t o give differ ent
priorit ies to different packet t ypes.
CoS technologies include I EEE 802.1p layer 2 t agging and DiffServ ( Different iated Services or DS) .
I EEE 802.1p t agging m akes use of t hree bits in the packet header, while DiffServ is a new prot ocol
and defines a new DS field, which r eplaces t he eight- bit ToS ( Type of Service) field in the I P header.
Tagging and Marking
I n a QoS class, you can configure whet her to add or change t he DSCP ( DiffServ Code Point ) value
and I EEE 802.1p priorit y level in a m atched packet . When the packet passes t hr ough a com patible
network, the networking device, such as a backbone switch, can provide specific t reatm ent or
service based on t he t ag or m arker.
9.2 The QoS General Screen
Use t his screen to enable or disable QoS, set t he bandwidt h, and select t o have the LTE Device
autom atically assign priorit y t o upstream traffic according to t he I EEE 802.1p priorit y level, I P
precedence or packet length.
Click N et w ork Set t ing > QoS t o open t he Gen er a l screen.
Figure 46 Net work Set ting > QoS > General