Nortel Networks NB5PLUS4/W - Manual (Page 43)

YML754 Rev1 NB5Plus4/W User Guide
www.netcomm.com.au 4
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.