
Chapter 11 Quality of Service (QoS)
11.2 What You Need to Know
The following terms and concepts may help as you read through this chapter.
QoS versus Cos
QoS is used to prioritize
CoS technologies include IEEE 802.1p layer 2 tagging and DiffServ (Differentiated Services or DS). IEEE 802.1p tagging makes use of three bits in the packet header, while DiffServ is a new protocol and defines a new DS field, which replaces the
Tagging and Marking
In a QoS class, you can configure whether to add or change the DSCP (DiffServ Code Point) value, IEEE 802.1p priority level and VLAN ID number in a matched packet. When the packet passes through a compatible network, the networking device, such as a backbone switch, can provide specific treatment or service based on the tag or marker.
11.3 The Quality of Service General Screen
Click Advanced Setup > Quality of Service to open the screen as shown next.
Use this screen to enable or disable QoS and set the default DSCP value for incoming traffic does not match a class. See Section 11.1 on page 129 for more information.
Figure 63 QoS General
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