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User Guide for Cisco Security Manager 4.4
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Chapter 63 Configuring Quality of Service
Quality of Service on Cisco IOS Routers
Step 1 On the Quality of Service page, click the Add button beneath the QoS Classes table, or select a class and
then click the Edit button. The QoS Class dialog box is displayed.
Step 2 Click the Policing tab. See Table63-9 on page 63-29 for a description of the fields on this tab.
Step 3 Select the Enable Policing check box.
Step 4 Define CIR , confirm burst, a nd excess burst va lues. You can define the CIR by percentage or by an
absolute value of bits per second. The option you choose determines how you define the burst values.
Step 5 Select the action to perform on packets that conform to the rate limit:
•transmit—Transmit the packet.
•set-prec-transmit—Set the IP precedence to a defined value, then send the packet. This option is not
available when configuring QoS on the control plane.
•set-dscp-transmit—Set the DSCP to a defined value, then send the packet. This option is not
available when configuring QoS on the control plane.
•drop—Drop the packet.
Step 6 Select the action to perform on exceed packets. The list of available actions depends on the selected
conform action.
For example, if transmit is performed on conforming packets, you can select any of the actions listed in
Step 5 for exceeding packets. However, if you selected one of the set actions for conforming packets,
you can select only a set action or the drop action for exceeding packets. If you selected drop as the
conform action, you must select drop as the exceed action.
Step 7 Select the action to perform on violate packets. The list of available actions depends on the selected
exceed action.
For example, if transmit is performed on exceeding packets, you can select any of the actions listed in
Step 5 for violating packets. However, if you selected one of the set actions for exceeding packets, you
can select only a set action or the drop action for violating packets. If you selected drop as the exceed
action, you must select drop as the violate action.
Step 8 Go to another tab, or click OK to save your definitions locally on the client and close the dialog box.
The defined class is displayed in the QoS Classes table on the Quality of Service page.
Step 9 Do one of the following:
•When defining QoS on interfaces, continue as described in Defining QoS Policies, page63-10.
•When defining control plane policing, continue as described in Defining QoS on the Control Plane,
page 63-12.
Defining QoS Class Shaping Parameters
When you define shaping parameters, you must specify whether to base traffic shaping on the average
data rate or on the average data rate plus the excess burst rate that occurs during traffic peaks. In both
cases, traffic that exceeds these definitions is buffered until the rate lowers, allowing the packets to be
sent.
The following conditions pertain:
•Shaping can be used only on output traffic.
•Shaping can be configured for all QoS classes, including the default class.
•Shaping is not available when you configure the QoS class for priority traffic.