ZyXEL P-2601HN-F1 User Guide - Page 136

What You Need to Know, 10.2 The QoS General Screen

Page 136 highlights

Chapter 10 Quality of Service (QoS) • Use the Class Setup screen to set up classifiers to sort traffic into different flows and assign priority and define actions to be performed for a classified traffic flow (Section 10.4 on page 140). • Use the Monitor screen to view the ZyXEL Device's QoS-related packet statistics (Section 10.5 on page 145). 10.1.2 What You Need to Know The following terms and concepts may help as you read this chapter. QoS versus Cos QoS is used to prioritize source-to-destination traffic flows. All packets in the same flow are given the same priority. CoS (class of service) is a way of managing traffic in a network by grouping similar types of traffic together and treating each type as a class. You can use CoS to give different priorities to different packet types. 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 eight-bit ToS (Type of Service) field in the IP header. 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. 10.2 The QoS General Screen Use this screen to enable or disable QoS, set the bandwidth, and select to have the ZyXEL Device automatically assign priority to upstream traffic according to the IEEE 802.1p priority level, IP precedence or packet length. 136 P-2601HN(L)-F1 Series User's Guide

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Chapter 10 Quality of Service (QoS)
P-2601HN(L)-F1 Series User’s Guide
136
Use the
Class Setup
screen to set up classifiers to sort traffic into different
flows and assign priority and define actions to be performed for a classified
traffic flow (
Section 10.4 on page 140
).
Use the
Monitor
screen to view the ZyXEL Device’s QoS-related packet
statistics (
Section 10.5 on page 145
).
10.1.2
What You Need to Know
The following terms and concepts may help as you read this chapter.
QoS versus Cos
QoS is used to prioritize source-to-destination traffic flows. All packets in the same
flow are given the same priority. CoS (class of service) is a way of managing traffic
in a network by grouping similar types of traffic together and treating each type as
a class. You can use CoS to give different priorities to different packet types.
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 eight-bit ToS (Type of Service) field in the IP header.
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.
10.2
The QoS General Screen
Use this screen to enable or disable QoS, set the bandwidth, and select to have
the ZyXEL Device automatically assign priority to upstream traffic according to the
IEEE 802.1p priority level, IP precedence or packet length.