DrayTek Vigor2860n-plus Router Manual PDF (Setup & Configuration Guide)

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Vigor2860 Series User’s Guide

247

downstream for each computer in LAN.

Allow auto adjustment

…

.- Check this box to make the

best utilization of available bandwidth.

Limitation List

Display a list of specific limitations that you set on this web

page.

Specific Limitation

Start IP -

Define the start IP address for limit bandwidth.

End IP -

Define the end IP address for limit bandwidth.

Each /Shared -

Select

Each

to make each IP within the

range of Start IP and End IP having the same speed defined

in TX limit and RX limit fields; select

Shared

to make all

the IPs within the range of Start IP and End IP share the

speed defined in TX limit and RX limit fields.

TX limit -

Define the limitation for the speed of the

upstream. If you do not set the limit in this field, the system

will use the default speed for the specific limitation you set

for each index.

RX limit -

Define the limitation for the speed of the

downstream. If you do not set the limit in this field, the

system will use the default speed for the specific limitation

you set for each index.

Add -

Add the specific speed limitation onto the list above.

Edit -

Allow you to edit the settings for the selected

limitation.

Delete -

Remove the selected settings existing on the

limitation list.

Smart Bandwidth Limit

Check this box to have the bandwidth limit determined by

the system automatically.

TX limit -

Define the limitation for the speed of the

upstream. If you do not set the limit in this field, the system

will use the default speed for the specific limitation you set

for each index.

RX limit -

Define the limitation for the speed of the

downstream. If you do not set the limit in this field, the

system will use the default speed for the specific limitation

you set for each index.

Time Schedule

Index (1-15) in Schedule Setup -

You can type in four sets

of time schedule for your request. All the schedules can be

set previously in

Application >> Schedule

web page and

you can use the number that you have set in that web page.

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3.9.3 Quality of Service

Deploying QoS (Quality of Service) management to guarantee that all applications receive the

service levels required and sufficient bandwidth to meet performance expectations is indeed

one important aspect of modern enterprise network.

One reason for QoS is that numerous TCP-based applications tend to continually increase their

transmission rate and consume all available bandwidth, which is called TCP slow start. If

other applications are not protected by QoS, it will detract much from their performance in the

overcrowded network. This is especially essential to those are low tolerant of loss, delay or

jitter (delay variation).

Another reason is due to congestions at network intersections where speeds of interconnected

circuits mismatch or traffic aggregates, packets will queue up and traffic can be throttled back

to a lower speed. If there’s no defined priority to specify which packets should be discarded

(or in another term “dropped”) from an overflowing queue, packets of sensitive applications

mentioned above might be the ones to drop off. How this will affect application performance?

There are two components within Primary configuration of QoS deployment:



Classification: Identifying low-latency or crucial applications and marking them for

high-priority service level enforcement throughout the network.



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, 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.

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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

Quality of Service

to open the web page.

Available settings are explained as follows:

Item

Description

General Setup

Index

–

Display the WAN interface number that you can edit.

Status

–

Display if the WAN interface is available for such

function or not.

Bandwidth

–

Display the inbound and outbound bandwidth

setting for the WAN interface.

Direction

–

Display which direction that such function will

influence.

Class 1/Class2/Class 3/Others

–

Display the bandwidth

percentage for each class.

UDP Bandwidth Control

–

Display the UDP bandwidth

control is enabled or not.

Online Statistics

–

Display an online statistics for quality of

service for your reference

Setup

–

Allow to configure general QoS setting for WAN

interface.

Class Rule

Index

–

Display the class number that you can edit.

Name

–

Display the name of the class.

Rule

–

Allow to configure detailed settings for the selected

Class.

Service Type

–

Allow to configure detailed settings for the

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Item

Description

service type.

Enable the First Priority

for VoIP SIP/RTP

When this feature is enabled, the VoIP SIP/UDP packets will

be sent with highest priority.

SIP UDP Port

–

Set a port number used for SIP.

This page displays the QoS settings result of the WAN interface. Click the

Setup

link to

access into next page for the general setup of WAN interface. As to class rule, simply click the

Edit

link to access into next for configuration.

You can configure general setup for the WAN interface, edit the Class Rule, and edit the

Service Type for the Class Rule for your request.

Online Statistics

Display an online statistics for quality of service for your reference. This feature is available

only when the Quality of Service for WAN interface is enabled.

General Setup for WAN Interface

When you click

Setup

, you can configure the bandwidth ratio for QoS of the WAN interface.

There are four queues allowed for QoS control. The first three (Class 1 to Class 3) class rules

can be adjusted for your necessity. Yet, the last one is reserved for the packets which are not

suitable for the user-defined class rules.

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Available settings are explained as follows:

Item

Description

Enable the QoS Control

The factory default for this setting is checked.

Please also define which traffic the QoS Control settings

will apply to.

IN-

apply to incoming traffic only.

OUT-

apply to outgoing traffic only.

BOTH-

apply to both incoming and outgoing traffic.

Check this box and click

, then click

Setup

link again.

You will see the

Online Statistics

link appearing on this

page.

WAN Inbound

Bandwidth

It allows you to set the connecting rate of data input for

WAN2/WAN3. For example, if your ADSL supports 1M of

downstream and 256K upstream, please set 1000kbps for

this box. The default value is 10000kbps.

WAN Outbound

Bandwidth

It allows you to set the connecting rate of data output for

WAN2/WAN3. For example, if your ADSL supports 1M of

downstream and 256K upstream, please set 256kbps for this

box. The default value is 10000kbps.

Reserved Bandwidth

Ratio

It is reserved for the group index in the form of ratio of

reserved bandwidth to upstream speed

and

reserved

bandwidth to downstream speed

Enable UDP Bandwidth

Control

Check this and set the limited bandwidth ratio on the right

field. This is a protection of TCP application traffic since

UDP application traffic such as streaming video will

exhaust lots of bandwidth.

Outbound TCP ACK

Prioritize

The difference in bandwidth between download and upload

are great in ADSL2+ environment. For the download speed

might be impacted by the uploading TCP ACK, you can

Rate

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