Figure 3-164: Configuring Traffic Shaping - AudioCodes Mediant 800 MSBG User Manual

SIP User's Manual
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 provides more sophisticated definitions, such as the following:
Bandwidth limit for each device
Bandwidth limit for classes of rules
Prioritization policy
TCP serialization on a device
The bandwidth of a device can be divided to reserve constant portions of bandwidth to
predefined traffic types. Such a portion is known as a Traffic Class. When not used by its
predefined traffic type, or owner (for example VoIP), the bandwidth is available to all other
traffic. However when needed, the entire class is reserved solely for its owner. Moreover,
you can limit the maximum bandwidth that a class can use even if the entire bandwidth is
available. When a shaping class is first defined for a specific traffic type, two shaping
classes are created. The second class is the 'Default Class', which is responsible for all the
packets that do not match the defined shaping class, or any other classes that may be
defined on the device.
To configure traffic shaping:
1. Click the Traffic Shaping item (Configuration tab > Data menu > QoS submenu >
Traffic Shaping); the following page appears:
2. Click the New Entry link; the following page appears.
3. From the 'Device' drop-down list, select the device ('Default WAN Device' or 'Default
LAN Device') for which you want to shape the traffic. If you want to apply the settings
on all LAN devices, select the 'Default LAN Device'.
Version 6.2

Figure 3-164: Configuring Traffic Shaping

Figure 3-165: Adding Device for Traffic Shaping
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3. Web-Based Management
February 2011