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Page 146 / 268 Scroll up to view Page 141 - 145
Chapter 11 Quality Of Service
P-660R-F1 Series User’s Guide
146
Tagging and Marking
In a QoS class, you can configure whether to add or change the DiffServ Code Point (DSCP) 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.
11.1.3
QoS Class Setup Example
In the following figure, your Internet connection has an upstream transmission speed of 50 Mbps.
You configure a classifier to assign the highest priority queue (6) to VoIP traffic from the LAN
interface, so that voice traffic would not get delayed when there is network congestion. Traffic from
the boss’s IP address (192.168.1.23 for example) is mapped to queue 5. Traffic that does not
Page 147 / 268
Chapter 11 Quality Of Service
P-660R-F1 Series User’s Guide
147
match these two classes are assigned priority queue based on the internal QoS mapping table on
the ZyXEL Device.
Figure 88
QoS Class Example: VoIP -
50 Mbps
DSL
VoIP: Queue 6
Boss: Queue 5
IP=192.168.1.23
Page 148 / 268
Chapter 11 Quality Of Service
P-660R-F1 Series User’s Guide
148
Figure 89
QoS Class Example: VoIP -2
Figure 90
QoS Class Example: Boss -1
Page 149 / 268
Chapter 11 Quality Of Service
P-660R-F1 Series User’s Guide
149
Figure 91
QoS Class Example: Boss -
2
11.2
The QoS General Screen
Use this screen to enable or disable QoS and have the ZyXEL Device automatically assign priority to
traffic according to the IEEE 802.1p priority level, IP precedence and/or packet length.
Page 150 / 268
Chapter 11 Quality Of Service
P-660R-F1 Series User’s Guide
150
Click
Advanced
>
QoS
to open the screen as shown next.
Figure 92
Advanced > QoS > General
The following table describes the labels in this screen.
Table 55
Advanced > QoS > General
LABEL
DESCRIPTION
Active QoS
Select the check box to turn on QoS to improve your network performance.
You can give priority to traffic that the ZyXEL Device forwards out through the WAN
interface. Give high priority to voice and video to make them run more smoothly.
Similarly, give low priority to many large file downloads so that they do not reduce the
quality of other applications.
WAN
Managed
Bandwidth
Enter the amount of bandwidth for the WAN interface that you want to allocate using
QoS.
The recommendation is to set this speed to match the interface’s actual transmission
speed. For example, set the WAN interface speed to 1000 kbps if your Internet
connection has an upstream transmission speed of 1 Mbps.
You can set this number higher than the interface’s actual transmission speed. This
will stop lower priority traffic from being sent if higher priority traffic uses all of the
actual bandwidth.
You can also set this number lower than the interface’s actual transmission speed.
This will cause the ZyXEL Device to not use some of the interface’s available
bandwidth.
Traffic
priority will
be
automaticall
y assigned
by
These fields are ignored if traffic matches a class you configured in the
Class Setup
screen.
If you select
ON
and traffic does not match a class configured in the
Class Setup
screen, the ZyXEL Device assigns priority to unmatched traffic based on the IEEE
802.1p priority level, IP precedence and/or packet length.
If you select
OFF
, traffic which does not match a class is mapped to queue two.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.

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