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Page 161 / 241 Scroll up to view Page 156 - 160
Vigor2130 Series User’s Guide
153
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Scheduling: Based on classification of service level to assign packets to queues and
associated service types
The basic QoS implementation in Vigor routers is to classify and schedule packets based on
the service type information in the IP header. For instance, to ensure the connection with the
headquarter, a teleworker may enforce an index of QoS Control to reserve bandwidth for
HTTPS connection while using lots of application at the same time.
One more larger-scale implementation of QoS network is to apply DSCP (Differentiated
Service Code Point) and IP Precedence disciplines at Layer 3. Compared with legacy IP
Precedence that uses Type of Service (ToS) field in the IP header to define 8 service classes,
DSCP is a successor creating 64 classes possible with backward IP Precedence compatibility.
In a QoS-enabled network, or Differentiated Service (DiffServ or DS) framework, a DS
domain owner should sign a Service License Agreement (SLA) with other DS domain owners
to define the service level provided toward traffic from different domains. Then each DS node
in these domains will perform the priority treatment. This is called per-hop-behavior (PHB).
The definition of PHB includes Expedited Forwarding (EF), Assured Forwarding (AF), and
Best Effort (BE). AF defines the four classes of delivery (or forwarding) classes and three
levels of drop precedence in each class.
Vigor routers as edge routers of DS domain shall check the marked DSCP value in the IP
header of bypassing traffic, thus to allocate certain amount of resource execute appropriate
policing, classification or scheduling. The core routers in the backbone will do the same
checking before executing treatments in order to ensure service-level consistency throughout
the whole QoS-enabled network.
However, each node may take different attitude toward packets with high priority marking
since it may bind with the business deal of SLA among different DS domain owners. It’s not
easy to achieve deterministic and consistent high-priority QoS traffic throughout the whole
network with merely Vigor router’s effort.
In the
Bandwidth Management
menu, click
QoS Control List
to open the web page.
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Vigor2130 Series User’s Guide
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QCE Type
Display the type of that QCE (QoS Control Entries).
Type Value
Display the value specified for the QCE.
Traffic Class
Display the class of the data transmission for the QCE.
QoS Control List allows users to set up to
five
groups of QCL. Each QCL group can contain
12 QCE settings.
Adding a New QCE
Click
to add a new QCE onto this page. Different QCE type will bring out different web
settings.
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If you choose
Ethernet Type
as QCE Type, you have to type value for it and specify
traffic class from Low, Normal, Medium and High.
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Vigor2130 Series User’s Guide
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Ethernet Type Value
Either
8~63
ASCII characters, such as 012345678(or 64
Hexadecimal digits leading by 0x, such as "0x321253abcde...").
z
If you choose
VLAN ID
as QCE Type, you have to type the ID number for it and specify
traffic class from Low, Normal, Medium and High.
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If you choose
TCP/UDP Port
as QCE Type, you have to type the port number for it and
specify traffic class from Low, Normal, Medium and High.
TCP/UDP Port
Click
Single
or
Range
. If you select Range, you have to type
in the starting port number and the end porting number on
the boxes below.
TCP/UDP Port Range
Type in the starting port number and the end porting number
here if you choose Range as the type.
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If you choose
DSCP
as QCE Type, you have to type value for it and specify traffic class
from Low, Normal, Medium and High.
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Vigor2130 Series User’s Guide
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If you choose
ToS
as QCE Type, you have to specify priority class from Low, Normal,
Medium and High.
z
If you choose
Tag Priority
as QCE Type, you have to specify priority class from Low,
Normal, Medium and High.
Editing a QCE
Click
to modify the settings of an existing QCE on this page.
Moving Up/Down a QCE
Click
and
to move a QCE up and down.
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Deleting a QCE
To delete a QCE in the list, simply click
of that one. It will be removed immediately.
4.5.5 Ports Priority
This page allows you to configure QoS settings for each port. The classification is controlled
by a QCL (Quality Control List) that is assigned to each port. A QCL consists of an ordered
list of up to 12 QCEs (Quality Control Entry). Each QCE can be used to classify certain
frames to a specific QoS class. This classification can be based on parameters such as VLAN
ID, UDP/TCP port, IPv4/IPv6 DSCP or Tag Priority. Frames not matching any of the QCEs
are classified to the default QoS class for the port.
Port
Indicate the interface for the physical port, WAN port, LAN
port and Wireless Port.
Default Class
Use the drop down list to choose the priority for each port.
QCL
Use the drop down list to choose the QCL number defined in
QoS Control List for the port.
Queuing Mode
Use the drop down list to choose suitable mode.

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