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Page 171 / 324 Scroll up to view Page 166 - 170
P-660HN-TxA User’s Guide
171
C
HAPTER
14
Quality of Service (QoS)
14.1
Overview
Use the
QoS
screen to set up your ZyXEL Device to use QoS for traffic
management.
Quality of Service (QoS) refers to both a network’s ability to deliver data with
minimum delay, and the networking methods used to control bandwidth. QoS
allows the ZyXEL Device to group and prioritize application traffic and fine-tune
network performance.
Without QoS, all traffic data are equally likely to be dropped when the network is
congested. This can cause a reduction in network performance and make the
network inadequate for time-critical applications such as video-on-demand.
The ZyXEL Device assigns each packet a priority and then queues the packet
accordingly. Packets assigned with a high priority are processed more quickly than
those with low priorities if there is congestion, allowing time-sensitive applications
to flow more smoothly. Time-sensitive applications include both those that require
a low level of latency (delay) and a low level of jitter (variations in delay) such as
Voice over IP (VoIP) or Internet gaming, and those for which jitter alone is a
problem such as Internet radio or streaming video.
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 match
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Chapter 14 Quality of Service (QoS)
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172
these two classes are assigned priority queue based on the internal QoS mapping
table on the ZyXEL Device.
Figure 84
QoS Example
14.1.1
What You Can Do in the QoS Screens
•
Use the
QoS
screen (
Section 14.2 on page 173
) to configure QoS settings on
the ZyXEL Device.
•
Use the
QoS Settings Summary
screen (
Section 14.2.1 on page 175
) to check
the summary of QoS rules and actions you configured for the ZyXEL Device.
14.1.2
What You Need to Know About QoS
802.1p
QoS is used to prioritize source-to-destination traffic flows. All packets in the same
flow are given the same priority. 802.1p 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 802.1p to give different priorities to different packet types.
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.
Finding Out More
See
Section 14.3 on page 176
for advanced technical information on QoS.
50 Mbps
DSL
VoIP: Queue 6
Boss: Queue 5
IP=192.168.1.23
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Chapter 14 Quality of Service (QoS)
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14.2
The QoS Screen
Use this screen to enable or disable QoS and have the ZyXEL Device assign
priority levels to traffic according to the port range, IEEE 802.1p priority level and/
or IP precedence.
Click
Advanced Setup > QoS
to open the screen as shown next.
Figure 85
Advanced Setup > QoS
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Chapter 14 Quality of Service (QoS)
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The following table describes the labels in this screen.
Table 58
Advanced Setup > QoS
LABEL
DESCRIPTION
Quality of Service
QoS
Use this field 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.
Summary
Click this to open a summary table showing the QoS settings. See
Section 14.2.1 on page 175
for more details.
Rule
Rule Index
Select the rule’s index number from the drop-down list box.
Active
Use this field to enable or disable the rule.
Application
Select an application from the drop-down list box. The
Destination Port
Range
and
Protocol ID
fields may change depending on the type of
applications you choose.
Physical Ports
Select
Enet1
to apply the rule to the Ethernet port.
Destination
MAC
Type a destination MAC address here. QoS is then applied to traffic
containing this destination MAC address. Leave it blank to apply the rule
to all MAC addresses.
IP
Enter a destination IP address in dotted decimal notation. QoS is then
applied to traffic containing this destination IP address. A blank
destination IP address means any destination IP address.
Mask
Enter a destination subnet mask here.
Port Range
Either use the default value set by the application you choose, or enter
the port number to which the rule should be applied.
Source MAC
Type a source MAC address here. QoS is then applied to traffic containing
this source MAC address. Leave it blank to apply the rule to all MAC
addresses.
IP
Enter a source IP address in dotted decimal notation. QoS is then applied
to traffic containing this source IP address. A blank source IP address
means any source IP address.
Mask
Enter a source subnet mask here.
Port Range
Enter the port number to which the rule should be applied. 0 means any
source port number. See
Appendix E on page 307
for some common
services and port numbers.
Protocol ID
Select an IP protocol type from the drop-down list box.
Vlan ID Range
Enter the source VLAN ID in this field.
IPP/DS Field
Select
IPP/TOS
to specify an IP precedence range and type of services.
Select
DSCP
to specify a DiffServ Code Point (DSCP) range.
IP Precedence
Range
Enter a range from 0 to 7 for IP precedence. Zero is the lowest priority
and seven is the highest.
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Chapter 14 Quality of Service (QoS)
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14.2.1
The QoS Settings Summary Screen
Use this screen to display a summary of rules and actions configured for the
ZyXEL Device. In the
Advanced > QoS
screen, click the
QoS Settings
Summary
button to open the following screen.
Figure 86
Advanced Setup > QoS > QoS Settings Summary
Type of
Service
Select a type of service from the drop-down list box.
Available options are:
Normal service
,
Minimize delay
,
Maximize
throughput
,
Maximize reliability
and
Minimize monetary cost
.
DSCP Range
Specify a DSCP number between 0 and 63 in this field.
802.1p
Select a priority level (0 to 7) from the drop-down list box.
Action
IPP/DS Field
Select
IPP/TOS
to specify an IP precedence range and type of services.
Select
DSCP
to specify a DiffServ Code Point (DSCP) range.
IP Precedence
Remarking
Enter a range from 0 to 7 to re-assign IP precedence to matched traffic.
Zero is the lowest priority and seven is the highest.
Type of
Service
Remarking
Select a type of service to re-assign the priority level to matched traffic.
Available options are:
Normal service
,
Minimize delay
,
Maximize
throughput
,
Maximize reliability
and
Minimize monetary cost
.
DSCP
Remarking
Specify a DSCP number between 0 and 63 to re-assign the priority level
to matched traffic.
802.1p
Remarking
Select a priority level (0 to 7) to re-assign the priority level to matched
traffic.
Queue #
Specify a
Low
,
Medium
,
High
or
Highest
queue tag to matched traffic.
Traffic assigned to a higher queue gets through faster while traffic in
lower queues is dropped when there is network congestion.
ADD
Click this to add the rule.
DELETE
Click this to remove the rule.
CANCEL
Click this to restore previously saved settings.
Table 58
Advanced Setup > QoS
LABEL
DESCRIPTION

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