Pirelli VoIP-AG-v1-t-Annex-A-OT Router Manual PDF (Setup & Configuration Guide)

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DISCUS™ Multiplay Wireless VoIP AG

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Quality of Service Section

example, a 100 Mbps Ethernet LAN with a 100 Mbps WAN interface router. The

router may communicate with the ISP using a modem with a bandwidth of

2Mbps. This typical configuration makes the modem, having no QoS module,

the bottleneck. The router sends traffic as fast as it is received, while its well-

designed QoS algorithms are left unused. Traffic shaping limits the bandwidth of

the router, artificially forcing the router to be the bottleneck.

A traffic shaper is essentially a regulated queue that accepts uneven and/or

bursty flows of packets and transmits them in a steady, predictable stream so

that the network is not overwhelmed with traffic.

While Traffic Priority allows basic prioritization of packets, Traffic Shaping pro-

vides more sophisticated definitions. Such are:

•

Bandwidth limit for each device

•

Bandwidth limit for classes of rules

•

Prioritization policy

•

TCP serialization on a device

Additionally, you can define QoS traffic shaping rules for a default device. These

rules will be used on a device that has no definitions of its own. This enables the

definition of QoS rules on Default WAN, for example, and their maintenance

even if the PPP or bridge device over the WAN is removed.

FIGURE 3.

Traffic Shaping Panel

DSCP SETTINGS

In order to understand what is Differentiated Services Code Point (DSCP), one

must first be familiarized with the Differentiated Services model.

Differentiated Services (Diffserv) is a Class of Service (CoS) model that

enhances best-effort Internet services by differentiating traffic by users, service

requirements and other criteria. Packets are specifically marked, allowing net-

work nodes to provide different levels of service, as appropriate for voice calls,

video playback or other delay-sensitive applications, via priority queuing or

bandwidth allocation, or by choosing dedicated routes for specific traffic flows.

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Diffserv defines a field in IP packet headers referred to as DSCP. Hosts or rout-

ers passing traffic to a Diffserv-enabled network will typically mark each trans-

mitted packet with an appropriate DSCP. The DSCP markings are used by

Diffserv network routers to appropriately classify packets and to apply particular

queue handling or scheduling behavior.

DISCUS™ Multiplay Wireless VoIP AG provides a table of predefined DSCP

values, which are mapped to 802.1p priority marking method. You can edit or

delete any of the existing DSCP setting, as well as add new entries.

1.

Click 'DSCP Settings' under the QoS tab in the 'Services' screen. The follow-

ing screen will appear

2.

To edit an existing entry, click its Edit action icon. To add a new entry, click

the 'New Entry' link. In both cases, the 'Edit DSCP Settings' screen will

appear.

3.

Configure the following fields: DSCP Value (hex) Enter a hexadecimal num-

ber that will serve as the DSCP value. 802.1p Priority Select a 802.1p priority

level from the combo-box (each priority level is mapped to low/medium/high

priority).

4.

Click 'OK' to save the settings.

FIGURE 4.

DSCP Settings Panel

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Quality of Service Section

802.1P SETTINGS

The IEEE 802.1p priority marking method is a standard for prioritizing network

traffic at the data link/Mac sub-layer. 802.1p traffic is simply classified and sent

to the destination, with no bandwidth reservations established.

The 802.1p header includes a 3-bit prioritization field, which allows packets to

be grouped into eight levels of priority. DISCUS™ Multiplay Wireless VoIP AG

maps these eight levels to three main priorities: high, medium and low. By

default, values six and seven are mapped to high priority, which may be

assigned to network-critical traffic. Values four and five are mapped to medium

priority, which may be applied to delay-sensitive applications, such as interactive

video and voice. Values three to zero are mapped to low priority, which may

range from controlled-load applications down to “loss eligible” traffic. The zero

value is normally used for best-effort traffic. It is the default value for traffic with

unassigned priority.

1.

Click '802.1p Settings' under the QoS tab in the 'Services' screen. The fol-

lowing screen will appear

2.

The eight 802.1p values are pre-configured with the three priority levels:

high, medium and low. You can change these levels for each of the eight val-

ues in their respective combo-box.

3.

Click 'OK' to save the settings.

FIGURE 5.

802.1p Settings Panel

CLASS STATISTICS

DISCUS™ Multiplay Wireless VoIP AG provides you with accurate, real-time

information on the traffic moving through your defined device classes. For exam-

ple, the amount of packets sent, dropped or delayed, are just a few of the

parameters that you can monitor per each shaping class.

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Quality of Service Section

To view your class statistics, click 'Class Statistics' under the QoS tab in the

'Services' screen. The following screen will appear. Note that class statistics will

only be available after defining at least one class (otherwise the screen will not

present any information).

FIGURE 6.

Class Statistics Panel

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Advanced Section

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Advanced

Section

This chapter will describe the

Advanced Section

accessible from

the

Home Page

of the

DISCUS™ Multiplay Wireless VoIP AG

.

The Advanced panel collects many functionalities from the operating

and configuration point of view. This chapter will describe one by one

all icons and related features as shown in the following screen shot.

Be aware that any configuration changes could compromise your connectivity.

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