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Page 136 / 359 Scroll up to view Page 131 - 135
Chapter 8 Quality of Service (QoS)
eircom F1000 Modem User’s Guide
136
similar types of traffic together and treating each type as a class. You can use CoS to give different
priorities to different packet types.
CoS technologies include IEEE 802.1p layer 2 tagging and DiffServ (Differentiated Services or DS).
IEEE 802.1p tagging makes use of three bits in the packet header, while DiffServ is a new protocol
and defines a new DS field, which replaces the eight-bit ToS (Type of Service) field in the IP header.
Tagging and Marking
In a QoS class, you can configure whether to add or change the DSCP (DiffServ Code Point) 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.
Traffic Shaping
Bursty traffic may cause network congestion. Traffic shaping regulates packets to be transmitted
with a pre-configured data transmission rate using buffers (or 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
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 8 Quality of Service (QoS)
eircom F1000 Modem User’s Guide
137
which are performed on the colored packets. See
Section 8.8 on page 148
for more information on
each metering algorithm.
8.3
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 8.1 on page
135
for more information.
Figure 73
Network Settings > QoS > General
The following table describes the labels in this screen.
Table 44
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.
Page 138 / 359
Chapter 8 Quality of Service (QoS)
eircom F1000 Modem User’s Guide
138
8.4
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 44
Network Setting > QoS > General (continued) (continued)
LABEL
DESCRIPTION
Page 139 / 359
Chapter 8 Quality of Service (QoS)
eircom F1000 Modem User’s Guide
139
The following table describes the labels in this screen.
8.4.1
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 45
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. Click the bulb to enable/disable
this 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 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 46
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 140 / 359
Chapter 8 Quality of Service (QoS)
eircom F1000 Modem User’s Guide
140
8.5
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 46
Queue Setup: Add (continued)
LABEL
DESCRIPTION
Table 47
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.

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