Nortel Networks NB5PLUS4/W manual AdvancedIPQoS, QoS Setup, Rules Configuration

Advanced>IPQoS

IP QoS (Quality of Service) allows you to set priorities for traffic travelling through your modem. For example, you may want to prioritize your UDP traffic over your TCP traffic. Typical UDP traffic would be your VoIP (Voice over Internet Protocol) traffic. 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 configure the upstream/downstream connection queue priorities, and

2.A Rules configuration page.

QoS Setup Page

The QoS setup page will have 2 primary fields:

1.Connection name selection,

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

IP QoS traffic shaping is associated with any transmitted traffic 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 configuration page will allow the user to define IP matching fields 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 fields for the user to select: 1.) A Trusted mode check box. 2.) A traffic 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 traffic 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 first 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 first 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.

YML754 Rev1	NB5Plus4/W User Guide
www.netcomm.com.au	43