Draytek Vigor2920n User's Guide download pdf (Page 202)

Vigor2920 Series User’s Guide

190

make the best utilization of

available bandwidth.

using according to the bandwidth limit set by the user. If yes,

the router will adjust the available bandwidth for users to

enhance the total utilization.

Limitation List

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

page.

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 total bandwidth of TX limit

and RX limit.

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.

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.

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:

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

high-priority service level enforcement throughout the network.

z Scheduling: Based on classification of service level to assign packets to queues and

associated service types

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