Cisco 500 series Administration Manual page 422

Configuring Quality of Service
Configuring QoS - General
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Cisco 500 Series Stackable Managed Switch Administration Guide
Configuring Egress Shaping per Queue
In addition to limiting transmission rate per port, which is done in the Bandwidth
,
page the switch can limit the transmission rate of selected egressing frames on a
per-queue per-port basis. Egress rate limiting is performed by shaping the output
load.
The switch limits all frames except for management frames. Any frames that are
not limited are ignored in the rate calculations, meaning that their size is not
included in the limit total.
Per-queue Egress rate shaping can be disabled.
To define egress shaping per queue:
Click Quality of Service > General > Egress Shaping per Queue. The Egress
Shaping Per Queue page is displayed.
The Egress Shaping Per Queue page displays the rate limit and burst size for
each queue.
Select an interface type (Port or LAG), and click Go. The list of Ports/LAGs is
displayed.
Select a Port/LAG, and click Edit. The Edit Egress Shaping Per Queue page is
displayed.
This page enables shaping the egress for up to four queues on each interface.
Select the Interface.
For each queue that is required, enter the following fields:
• Enable Shaping—Select to enable egress shaping on this queue
• Committed Information Rate (CIR)—Enter the maximum rate (CIR) in Kbits
per second (Kbps). CIR is the average maximum amount of data that can be
sent.
• Committed Burst Size (CBS)—Enter the maximum burst size (CBS) in bytes.
CBS is the maximum burst of data allowed to be sent even if a burst exceeds
CIR.
Click Apply. The bandwidth settings are written to the Running Configuration file.
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