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Page 136 / 344 Scroll up to view Page 131 - 135
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.
Page 137 / 344
Chapter 10 Quality of Service (QoS)
P-2601HN(L)-F1 Series User’s Guide
137
Click
Network Setting > QoS
to open the
General
screen.
Figure 59
Network Setting > QoS > General
The following table describes the labels in this screen.
Table 28
Network Setting > 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
Upstream
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 100000
kbps if your Internet connection has an upstream transmission speed of
100 Mbps.
Setting this number higher than the interface’s actual transmission speed
will stop lower priority traffic from being sent if higher priority traffic uses
all of the actual bandwidth.
If you set this number lower than the interface’s actual transmission
speed, the ZyXEL Device will not use some of the interface’s available
bandwidth.
Leave this field blank to have the ZyXEL Device set this value
automatically.
Traffic priority
will be
automatically
assigned by
These fields are ignored if upstream traffic matches a class you
configured in the
Class Setup
screen.
If you select
Ethernet Priority
,
IP Precedence
or
Packet Length
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 or packet length.
See
Section 10.6.1 on page 146
for more information.
Page 138 / 344
Chapter 10 Quality of Service (QoS)
P-2601HN(L)-F1 Series User’s Guide
138
10.3
The Queue Setup Screen
Use this screen to configure QoS queue assignment. Click
Network Setting >
QoS > Queue Setup
to open the screen as shown next.
Figure 60
Network Setting > QoS > Queue Setup
The following table describes the labels in this screen.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Table 28
Network Setting > QoS > General (continued)
LABEL
DESCRIPTION
Table 29
Network Setting > QoS > Queue Setup
LABEL
DESCRIPTION
Add new
Queue
Click this to create a new entry.
#
This is the index number of this entry.
Status
This shows whether the queue is activated or not.
A yellow bulb signifies that this queue is activated. A gray bulb signifies
that this queue is not activated.
Name
This shows the descriptive name of this queue.
Interface
This shows the name of the ZyXEL Device’s interface through which traffic
in this queue passes.
Priority
This shows the priority of this queue.
Weight
This shows the weight of this queue.
Buffer
Management
This shows the queue management algorithm used by the ZyXEL Device.
Rate Limit
(kbps)
This shows the maximum transmission rate allowed for traffic on this
queue.
Page 139 / 344
Chapter 10 Quality of Service (QoS)
P-2601HN(L)-F1 Series User’s Guide
139
10.3.1
Add/Edit a QoS Queue
Use this screen to configure a queue. Click
Add new queue
in the
Queue Setup
screen or the
Edit
icon next to an existing queue.
Figure 61
Queue Setup: Add/Edit
The following table describes the labels in this screen.
Modify
Click the
Edit
icon to edit the queue.
Click the
Delete
icon to delete an existing queue. Note that subsequent
rules move up by one when you take this action.
Apply
Click
Apply
to save your changes.
Cancel
Click
Cancel
to restore your previously saved settings.
Table 29
Network Setting > QoS > Queue Setup (continued)
LABEL
DESCRIPTION
Table 30
Queue Setup: Add/Edit
LABEL
DESCRIPTION
Active
Select to enable or disable this queue.
Name
Enter the descriptive name of this queue.
Interface
Select the interface to which this queue is applied.
Priority
Select the priority level (from 1 to 7) of this queue.
The larger the number, the higher the priority level. Traffic assigned to
higher priority queues gets through faster while traffic in lower priority
queues is dropped if the network is congested.
Weight
Select the weight (from 1 to 15) of this queue.
If two queues have the same priority level, the ZyXEL Device divides the
bandwidth across the queues according to their weights. Queues with
larger weights get more bandwidth than queues with smaller weights.
Rate Limit
Specify the maximum transmission rate (in Kbps) allowed for traffic on
this queue.
Apply
Click
Apply
to save your changes.
Back
Click
Back
to return to the previous screen without saving.
Page 140 / 344
Chapter 10 Quality of Service (QoS)
P-2601HN(L)-F1 Series User’s Guide
140
10.4
The Class Setup Screen
Use this screen to add, edit or delete QoS classifiers. A classifier groups traffic into
data flows according to specific criteria such as the source address, destination
address, source port number, destination port number or incoming interface. For
example, you can configure a classifier to select traffic from the same protocol
port (such as Telnet) to form a flow.
You can give different priorities 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.
Click
Network Setting >
QoS > Class Setup
to open the following screen.
Figure 62
Network Setting > QoS > Class Setup
The following table describes the labels in this screen.
Table 31
Network Setting > QoS > Class Setup
LABEL
DESCRIPTION
Add new
Classifier
Click
this to create a new classifier.
Order
This field displays the order number of the classifier.
Status
This shows whether the classifier is activated or not.
A yellow bulb signifies that this classifier is activated. A gray bulb
signifies that this classifier is not activated.
Class Name
This is the name of the classifier.
Classification
Criteria
This shows criteria specified in this classifier, for example the interface
from which traffic of this class should come and the source MAC
address of traffic that matches this classifier.

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