Nortel-networks NB5PLUS4/W Manuel d'utilisateur télécharger pdf (Page 43)

YML754 Rev1 NB5Plus4/W User Guide

www.netcomm.com.au 43

Advanced>IPQoS

IP QoS (Quality of Service) allows you to set priorities for trafc travelling through

your modem. For example, you may want to prioritize your UDP trafc over your

TCP trafc. Typical UDP trafc would be your VoIP (Voice over Internet Protocol)

trafc. This section describes how to make use of your modem’s IPQoS feature.

The NB5Plus4/W should have two primary sections for setting up IP QoS services:

1. A QoS setup page to congure the upstream/downstream connection queue

priorities, and

2. A Rules conguration page.

QoS Setup Page

The QoS setup page will have 2 primary elds:

1. Connection name selection,

2. A table to select queue weights for the system transmit queues.

IP QoS trafc shaping is associated with any transmitted trafc from the perspective

of the NB5Plus4/W. Each interface has 3 priority queues associated with transmit

data. The web UI will allow the user to choose any interface connection and select

the priority weights associated with that connection. For Example; the user could

have a connection named WAN1 or a connection named LAN1. If the user selects

WAN1 the transmit queues will be associated with that connection, and likewise

with LAN1 (Refer to the following diagrams). All interfaces on the LAN are currently

bridged and therefore the only connection name is that name associated with the

LAN.

Transmit queues associated with WAN connection

Transmit queues associated with LAN connection

The high priority queue has strict priority over the medium and low priority queue,

and therefore can exhaust all available bandwidth. The web UI will allow the user to

select the weights of the medium and low priority queues in increments of 10 per-

cent so that the sum of the weights of the 2 queues is equal to 100 percent. These

queues will be serviced on a Round Robin priority basis according to the weights

assigned, after the high priority queue has been completely serviced.

Rules Configuration Page

The Rules conguration page will allow the user to dene IP matching elds to asso-

ciate with the priority queues associated with the named connections selected above

in the “QoS Setup Page” section.

There will be three primary elds for the user to select: 1.) A Trusted mode check

box. 2.) A trafc priority choice (High, Medium, Low), and 3.) An IP rules matching

selection area.

The NB5Plus4/W has two primary modes of operation with regard to queue trafc

prioritization; Trusted, and Un-trusted. The Web UI will provide one check box to

enable trusted mode. In trusted mode all rules will be applied rst regardless of the

setting of the TOS bits. After the rules have been exhausted the existing TOS bit

settings will be honoured. If the “Trusted mode” box is unchecked this will indicate

the “Un-trusted mode.” “Un-trusted” mode will match rst against all rules as in

“Trusted” mode. The difference is that if there is no match then a default rule will be

used. The default rule will have an associated queuing priority.

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Nortel-networks NB5PLUS4/W Manuel d'utilisateur Page 43

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