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Page 146 / 327 Scroll up to view Page 141 - 145
Chapter 10 Quality of Service (QoS)
VMG3926-B10A User’s Guide
146
The following table describes the labels in this screen.
10.5
The Classification 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 VMG 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 > Classification Setup
to open the following screen.
Figure 70
Network Setting > QoS > Classification Setup
Table 46
Queue Setup: Add
LABEL
DESCRIPTION
Enable
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.
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 VMG 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 VMG 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.
Page 147 / 327
Chapter 10 Quality of Service (QoS)
VMG3926-B10A User’s Guide
147
The following table describes the labels in this screen.
10.5.1
Add/Edit QoS Class
Click
Add New Classification
in the
Classification Setup
screen or the
Edit
icon next to a
classifier to open the following screen.
Table 47
Network Setting > QoS > Classification Setup
LABEL
DESCRIPTION
Add New
Classification
Click
this to create a new classifier.
Order
This is the index number of the entry. The classifiers are applied in order of their
numbering.
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 148 / 327
Chapter 10 Quality of Service (QoS)
VMG3926-B10A User’s Guide
148
Figure 71
Classification Setup: Add/Edit
The following table describes the labels in this screen.
Table 48
Classification Setup: Add/Edit
LABEL
DESCRIPTION
Step1: Class Configuration
Enable
Select this to enable this classifier.
Class Name
Enter a descriptive name of up to 15 printable English keyboard characters, not including
spaces.
Order
Select an existing number for where you want to put this classifier to move the classifier to
the number you selected after clicking
Apply
.
Select
Last
to put this rule in the back of the classifier list.
Page 149 / 327
Chapter 10 Quality of Service (QoS)
VMG3926-B10A User’s Guide
149
Step2: Criteria Configuration
From Interface
If you want to classify the traffic by an ingress interface, select an interface from the
From
Interface
drop-down list box.
Ether Type
Select a predefined application to configure a class for the matched traffic.
If you select
IP
, you also need to configure source or destination MAC address, IP address,
DHCP options, DSCP value or the protocol type.
If you select
802.1Q
, you can configure an 802.1p priority level.
Source
Address
Select the check box and enter the source IP address in dotted decimal notation. A blank
source IP address means any source IP address.
Subnet
Mask
Enter the source subnet mask.
Port Range
If you select
TCP
or
UDP
in the
IP Protocol
field, select the check box and enter the port
number(s) of the source.
MAC
Select the check box and enter the source MAC address of the packet.
MAC Mask
Type the mask for the specified MAC address to determine which bits a packet’s MAC
address should match.
Enter “f” for each bit of the specified source MAC address that the traffic’s MAC address
should match. Enter “0” for the bit(s) of the matched traffic’s MAC address, which can be of
any hexadecimal character(s). For example, if you set the MAC address to
00:13:49:00:00:00 and the mask to ff:ff:ff:00:00:00, a packet with a MAC address of
00:13:49:12:34:56 matches this criteria.
Exclude
Select this option to exclude the packets that match the specified criteria from this classifier.
Destination
Address
Select the check box and enter the source IP address in dotted decimal notation. A blank
source IP address means any source IP address.
Subnet
Mask
Enter the source subnet mask.
Port Range
If you select
TCP
or
UDP
in the
IP Protocol
field, select the check box and enter the port
number(s) of the source.
MAC
Select the check box and enter the source MAC address of the packet.
MAC Mask
Type the mask for the specified MAC address to determine which bits a packet’s MAC
address should match.
Enter “f” for each bit of the specified source MAC address that the traffic’s MAC address
should match. Enter “0” for the bit(s) of the matched traffic’s MAC address, which can be of
any hexadecimal character(s). For example, if you set the MAC address to
00:13:49:00:00:00 and the mask to ff:ff:ff:00:00:00, a packet with a MAC address of
00:13:49:12:34:56 matches this criteria.
Exclude
Select this option to exclude the packets that match the specified criteria from this classifier.
Others
Service
This field is available only when you select
IP
in the
Ether Type
field.
This field simplifies classifier configuration by allowing you to select a predefined
application. When you select a predefined application, you do not configure the rest of the
filter fields.
Protocol
This field is available only when you select
IP
in the
Ether Type
field.
Select this option and select the protocol (service type) from
TCP
,
UDP
,
ICMP
or
IGMP
. If
you select
User defined
, enter the protocol (service type) number.
Table 48
Classification Setup: Add/Edit (continued)
LABEL
DESCRIPTION
Page 150 / 327
Chapter 10 Quality of Service (QoS)
VMG3926-B10A User’s Guide
150
DHCP
This field is available only when you select
IP
in the
Ether Type
field.
Select this option and select a DHCP option.
If you select
Vendor Class ID (DHCP Option 60)
, enter the Vendor Class Identifier
(Option 60) of the matched traffic, such as the type of the hardware or firmware.
If you select
Client ID (DHCP Option 61)
, enter the Identity Association IDentifier (IAD
Option 61) of the matched traffic, such as the MAC address of the device.
If you select
User Class ID (DHCP Option 77)
, enter a string that identifies the user’s
category or application type in the matched DHCP packets.
If you select
Vendor Specific Info (DHCP Option 125)
, enter the vendor specific
information of the matched traffic, such as the product class, model name, and serial
number of the device.
Packet
Length
This field is available only when you select
IP
in the
Ether Type
field.
Select this option and enter the minimum and maximum packet length (from 46 to 1500) in
the fields provided.
DSCP
This field is available only when you select
IP
in the
Ether Type
field.
Select this option and specify a DSCP (DiffServ Code Point) number between 0 and 63 in the
field provided.
802.1P
This field is available only when you select
802.1Q
in the
Ether Type
field.
Select this option and select a priority level (between 0 and 7) from the drop-down list box.
"0" is the lowest priority level and "7" is the highest.
VLAN ID
This field is available only when you select
802.1Q
in the
Ether Type
field.
Select this option and specify a VLAN ID number.
TCP ACK
This field is available only when you select
IP
in the
Ether Type
field.
If you select this option, the matched TCP packets must contain the ACK (Acknowledge)
flag.
Exclude
Select this option to exclude the packets that match the specified criteria from this classifier.
Step3: Packet Modification
DSCP Mark
This field is available only when you select
IP
in the
Ether Type
field.
If you select
Remark
, enter a DSCP value with which the VMG replaces the DSCP field in
the packets.
If you select
Unchange
, the VMG keep the DSCP field in the packets.
802.1P Mark
Select a priority level with which the VMG replaces the IEEE 802.1p priority field in the
packets.
If you select
Unchange
, the VMG keep the 802.1p priority field in the packets.
VLAN ID
If you select
Remark
, enter a VLAN ID number with which the VMG replaces the VLAN ID of
the frames.
If you select
Remove
, the VMG deletes the VLAN ID of the frames before forwarding them
out.
If you select
Add
, the VMG treat all matched traffic untagged and add a second VLAN ID.
If you select
Unchange
, the VMG keep the VLAN ID in the packets.
Step4: Class Routing
Forward to
Interface
Select a WAN interface through which traffic of this class will be forwarded out. If you select
Unchange
, the VMG forward traffic of this class according to the default routing table.
Table 48
Classification Setup: Add/Edit (continued)
LABEL
DESCRIPTION

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