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Page 151 / 331 Scroll up to view Page 146 - 150
Chapter 10 Quality of Service (QoS)
VMG1312-B Series User’s Guide
151
10.4
The Queue Setup Screen
Click
Network Setting >
QoS > Queue Setup
to open the screen as shown next.
Use this screen to configure QoS queue assignment.
Figure 70
Network Setting > QoS > Queue Setup
LAN Managed
Downstream
Bandwidth
Enter the amount of downstream bandwidth for the LAN interfaces (including WLAN) that
you want to allocate using QoS.
The recommendation is to set this speed to match the WAN interfaces’ actual transmission
speed. For example, set the LAN managed downstream bandwidth to 100000 kbps if you
use a 100 Mbps wired Ethernet WAN connection.
You can also set this number lower than the WAN interfaces’ actual transmission speed. This
will cause the Device to not use some of the interfaces’ available bandwidth.
If you leave this field blank, the Device automatically sets this to the LAN interfaces’
maximum supported connection speed.
Upstream
traffic priority
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.
Cancel
Click
Cancel
to restore your previously saved settings.
Table 45
Network Setting > QoS > General (continued) (continued)
LABEL
DESCRIPTION
Page 152 / 331
Chapter 10 Quality of Service (QoS)
VMG1312-B Series User’s Guide
152
The following table describes the labels in this screen.
10.4.1
Adding a QoS Queue
Click
Add new Queue
or the edit icon in the
Queue Setup
screen to configure a queue.
Figure 71
Queue Setup: Add
The following table describes the labels in this screen.
Table 46
Network Setting > QoS > Queue Setup
LABEL
DESCRIPTION
Add new Queue
Click this button to create a new queue entry.
#
This is the index number of the entry.
Status
This field displays whether the queue is active or not. A yellow bulb signifies that this queue
is active. A gray bulb signifies that this queue is not active.
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 for this queue.
Queue management algorithms determine how the Device should handle packets when it
receives too many (network congestion).
Rate Limit
This shows the maximum transmission rate allowed for traffic on this queue.
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.
Table 47
Queue Setup: Add
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.
This field is read-only if you are editing the queue.
Page 153 / 331
Chapter 10 Quality of Service (QoS)
VMG1312-B Series User’s Guide
153
10.5
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 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.
Priority
Select the priority level (from 1 to 7) 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)
.
Drop Tail (DT)
is a simple queue management
algorithm that allows the Device buffer to accept as many packets as it can until it is full.
Once the buffer is full, new packets that arrive are dropped until there is space in the buffer
again (packets are transmitted out of it).
Rate Limit
Specify the maximum transmission rate (in Kbps) allowed for traffic on this queue.
OK
Click
OK
to save your changes.
Cancel
Click
Cancel
to exit this screen without saving.
Table 47
Queue Setup: Add (continued)
LABEL
DESCRIPTION
Page 154 / 331
Chapter 10 Quality of Service (QoS)
VMG1312-B Series User’s Guide
154
Figure 72
Network Setting > QoS > Class Setup
The following table describes the labels in this screen.
10.5.1
Add/Edit QoS Class
Click
Add new Classifier
in the
Class Setup
screen or the
Edit
icon next to a classifier to open
the following screen.
Table 48
Network Setting > QoS > Class Setup
LABEL
DESCRIPTION
Add new Classifier
Click
this to create a new classifier.
#
This is the index number of the entry.
Status
This field displays whether the classifier is active or not. A yellow bulb signifies that this
classifier is active. A gray bulb signifies that this classifier is not active.
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.
DSCP Mark
This is the DSCP number added to traffic of this classifier.
802.1P Mark
This is the IEEE 802.1p priority level assigned to traffic of this classifier.
VLAN ID Tag
This is the VLAN ID number assigned to traffic of this classifier.
To Queue
This is the name of the queue in which traffic of this classifier is put.
Modify
Click the
Edit
icon to edit the classifier.
Click the
Delete
icon to delete an existing classifier. Note that subsequent rules move
up by one when you take this action.
Page 155 / 331
Chapter 10 Quality of Service (QoS)
VMG1312-B Series User’s Guide
155
Figure 73
Class Setup: Add/Edit
The following table describes the labels in this screen.
Table 49
Class Setup: Add/Edit
LABEL
DESCRIPTION
Active
Select this to enable this classifier.
Class Name
Enter a descriptive name of up to 15 printable English keyboard characters, not including
spaces.

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