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Chapter 4 Policy-enabled networks
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Shaping overview
Shaping, or traffic shaping, which operates at egress, smooths the traffic on the
uplink connection to the network core to provide efficient bandwidth utilization.
Shaping is available only on the output ports of the BPS 2000-1GT, BPS
2000-2GT, or BPS 2000-2GE MDAs.
Using these MDAs, you can shape the traffic to fit the profile specified in the
Service Level Agreement (SLA). Shaping specifies the maximum rate at which
traffic will be transmitted over a given time. Traffic is allowed to exceed this rate
in short bursts. You specify a burst size to indicate the maximum burst size of
traffic allowed to egress without a shaping delay.
Traffic that is being shaped may need to be buffered temporarily to conform to the
specified flows. You can choose whether 1, 2, 4, 8, or 16 packets can be held in the
shaping queue. Some packets may be dropped if buffers are completely used.
Traffic flows can be metered and shaped, or only shaped (or only metered).
Shaped packets will lose the loss sensitivity property.
Shaping is accomplished using QoS Policies (refer to
,” next, for
more information on Policies). Shaping is applied to a traffic flow by configuring
a Policy to reference that particular Shaper. When you delete a Policy, the shaping
on that Policy is also deleted. You can also configure aggregate shaping, which is
shaping a group of policies as a single policy.
As with Meters and Policies, Shapers and Policies work together. First, you
configure a Shaper. When you configure a policy, you reference a particular
Shaper. Additionally, the system assigns each Policy a unique Shaping Group
value, from 2 to 63, if you do not assign that Policy a specific Shaping Group
value. Thus, the Shaping Group value for the Policy is user-configurable, or the
system will assign the value.
Note:
You must install the BPS 2000-1GT, BPS 2000-2GT, or BPS
2000-2GE MDA in a Business Policy Switch in order to use shaping.
Содержание business policy switch 2000
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