Configuring Quality of Service
QoS Advanced Mode
Cisco 500 Series Stackable Managed Switch Administration Guide
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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 will apply the QoS to all its flow(s) in aggregation regardless of policies and
ports.
NOTE
The switch 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
. The
Aggregate Policer
page
is displayed.
This page displays the existing aggregate policers.
STEP 2
Click
Add
. The
Add Aggregate Policer
page
is displayed.
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 description in the
Bandwidth
page
.
