Zyxel VMG8924-B30A Router Manual PDF (Setup & Configuration Guide)

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Chapter 9 Quality of Service (QoS)

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141

which are performed on the colored packets. See

Section 9.8 on page 152

for more information on

each metering algorithm.

9.3

The Quality of Service General Screen

Click

Network Setting > QoS > General

to open the screen as shown next.

Use this screen to enable or disable QoS and set the upstream bandwidth. See

Section 9.1 on page

139

for more information.

Figure 73

Network Settings > QoS > General

The following table describes the labels in this screen.

Table 46

Network Setting > QoS > General

LABEL

DESCRIPTION

QoS

Select the

Enable

check box to turn on QoS to improve your network performance.

WAN Managed

Upstream

Bandwidth

Enter the amount of upstream bandwidth for the WAN interfaces that you want to allocate

using QoS.

The recommendation is to set this speed to match the interfaces’ actual transmission speed.

For example, set the WAN interfaces’ speed to 100000 kbps if your Internet connection has

an upstream transmission speed of 100 Mbps.

You can set this number higher than the interfaces’ 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 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 number to be 95% of the

WAN interfaces’ actual upstream transmission speed.

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9.4

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 74

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 46

Network Setting > QoS > General (continued) (continued)

LABEL

DESCRIPTION

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The following table describes the labels in this screen.

9.4.1

Adding a QoS Queue

Click

Add new Queue

or the edit icon in the

Queue Setup

screen to configure a queue.

Figure 75

Queue Setup: Add

The following table describes the labels in this screen.

Table 47

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 48

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.

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9.5

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.

Figure 76

Network Setting > QoS > Class Setup

The following table describes the labels in this 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 48

Queue Setup: Add (continued)

LABEL

DESCRIPTION

Table 49

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.

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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.

Table 49

Network Setting > QoS > Class Setup (continued)

LABEL

DESCRIPTION

Rate

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