Quality of Service
QoS Advanced Mode
Cisco 500 Series Stackable Managed Switch Administration Guide Release 1.3 500
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Each policer is defined with its own QoS specification with a combination of the
following parameters:
• A maximum allowed rate, called a Committed Information Rate (CIR),
measured in Kbps.
• An amount of traffic, measured in bytes, called a Committed Burst Size
(CBS). This is traffic that is allowed to pass as a temporary burst even if it is
above the defined maximum rate.
• An action to be applied to frames that are over the limits (called out-of-
profile traffic), where such frames can be passed as is, dropped, or passed,
but remapped to a new DSCP value that marks them as lower-priority
frames for all subsequent handling within the device.
Assigning a policer to a class map is done when a class map is added to a policy.
If the policer is an aggregate policer, you must create it using the Aggregate
Policer page.
Defining Aggregate Policers
An aggregate policer applies the QoS to one or more class maps, therefore one or
more flows. An aggregation policer can support class maps from different policies
and applies the QoS to all its flow(s) in aggregation regardless of policies and
ports.
NOTE The device supports aggregate policers and single policers only when operating
in Layer 2 mode.
To define an aggregate policer:
STEP 1 Click Quality of Service > QoS Advanced Mode > Aggregate Policer.
This page displays the existing aggregate policers.
STEP 2 Click Add.
STEP 3 Enter the parameters.
• Aggregate Policer Name—Enter the name of the Aggregate Policer.
• Ingress Committed Information Rate (CIR)—Enter the maximum
bandwidth allowed in bits per second. See the description of this in the
Bandwidth page.
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