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Page 191 / 382 Scroll up to view Page 186 - 190
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
191
queues). Your Device uses the Token Bucket algorithm to allow a certain amount
of large bursts while keeping a limit at the average rate.
Traffic Policing
Traffic policing is the limiting of the input or output transmission rate of a class of
traffic on the basis of user-defined criteria. Traffic policing methods measure traffic
flows against user-defined criteria and identify it as either conforming, exceeding
or violating the criteria.
The Device supports three incoming traffic metering algorithms: Token Bucket
Filter (TBF), Single Rate Two Color Maker (srTCM), and Two Rate Two Color Marker
(trTCM). You can specify actions which are performed on the colored packets. See
Section 16.8 on page 206
for more information on each metering algorithm.
16.3
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, set the bandwidth, and select to have
the Device automatically assign priority to upstream traffic according to the IEEE
Traffic
Time
Traffic Rate
Traffic
Time
Traffic Rate
(Before Traffic Shaping)
(After Traffic Shaping)
Traffic
Time
Traffic Rate
Traffic
Time
Traffic Rate
(Before Traffic Policing)
(After Traffic Policing)
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Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
192
802.1p priority level, IP precedence or packet length. See
Section 16.1 on page
189
for more information.
Figure 99
QoS General
The following table describes the labels in this screen.
Table 66
QoS General
LABEL
DESCRIPTION
Enable QoS
Select the check box to turn on QoS to improve your network
performance.
WAN Managed
Upstream
Bandwidth
Enter the amount of upstream 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.
You can set this number higher than the interface’s actual transmission
speed. The Device uses up to 95% of the DSL port’s actual upstream
transmission speed even if you set this number higher than the DSL
port’s actual transmission speed.
You can also set this number lower than the interface’s actual
transmission speed. This will cause the Device to not use some of the
interface’s available bandwidth.
If you leave this field blank, the Device automatically sets this number
to be 95% of the DSL port’s actual upstream transmission speed.
Page 193 / 382
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
193
16.4
The Queue Setup Screen
Click
QoS > Queue Setup
to open the screen as shown next.
LAN/WLAN
Managed
Downstream
Bandwidth
Enter the amount of downstream bandwidth for the LAN and WLAN that
you want to allocate using QoS.
The recommendation is to set this speed to match the WAN interface’s
actual downstream speed. For example, set the WAN interface speed to
100000 kbps if your Internet connection has a downstream transmission
speed of 100 Mbps.
You can set this number higher than the interface’s downstream speed.
The Device uses up to 95% of the DSL port’s actual downstream speed
even if you set this number higher than the DSL port’s actual
downstream speed.
You can also set this number lower than the WAN interface’s actual
downstream speed. This will cause the Device to not use some of the
interface’s available bandwidth.
If you leave this field blank, the Device automatically sets this number
to be 95% of the DSL port’s actual downstream speed.
Upstream
traffic priority
will be
automatically
assigned by
Select how the Device assigns priorities to various upstream traffic
flows.
•
None
: Disables auto priority mapping and has the Device put
packets into the queues according to your classification rules. Traffic
which does not match any of the classification rules is mapped into
the default queue with the lowest priority.
•
Ethernet Priority
: Automatically assign priority based on the IEEE
802.1p priority level.
•
IP Precedence
: Automatically assign priority based on the first
three bits of the TOS field in the IP header.
•
Packet Length
: Automatically assign priority based on the packet
size. Smaller packets get higher priority since control, signaling, VoIP,
internet gaming, or other real-time packets are usually small while
larger packets are usually best effort data packets like file transfers.
Apply
Click
Apply
to save your changes back to the Device.
Cancel
Click
Cancel
to begin configuring this screen afresh.
Table 66
QoS General
LABEL
DESCRIPTION
Page 194 / 382
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
194
Use this screen to configure QoS queue assignment.
Figure 100
QoS Queue Setup
The following table describes the labels in this screen.
Table 67
QoS Queue Setup
LABEL
DESCRIPTION
Add
Click this button to create a new entry.
No.
This is the index number of this entry.
Active
Select the check box to enable the queue.
Name
This shows the descriptive name of this queue.
Interface
This shows the name of the 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 Device.
Rate Limit
This shows the maximum transmission rate allowed for traffic on this
queue.
Modify
Click the
Edit
icon to go to the screen where you can edit the queue.
Click the
Remove
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 back to the Device.
Page 195 / 382
Chapter 16 Quality of Service (QoS)
P-870HN-51b User’s Guide
195
16.4.1
Adding a QoS Queue
Click the
Add
button or the edit icon in the
Queue Setup
screen to configure a
queue.
Figure 101
QoS Queue Setup: Add
The following table describes the labels in this screen.
Table 68
QoS Queue Setup: Add
LABEL
DESCRIPTION
Enable
Select this to have the Device’s QoS use this queue.
Name
Enter the descriptive name of this queue.
Outgoing
Interface
Select the WAN interface to which this queue is applied.
Priority
Select the priority level (from 1 to 3) of this queue.
The smaller 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 8) of this queue.
If two queues have the same priority level, the Device divides the
bandwidth across the queues according to their weights. Queues with
larger weights get more bandwidth than queues with smaller weights.
Buffer
Management
This field displays
Drop Tail (DT)
and the Device drops the newly arriving
packet when the queue is full.
Rate Limit
Specify the maximum transmission rate (in Kbps) allowed for traffic on
this queue.
Back
Click
Back
to return to the previous screen without saving.
Apply
Click
Apply
to save your changes back to the Device.
Cancel
Click
Cancel
to begin configuring this screen afresh.

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