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63-27
User Guide for Cisco Security Manager 4.4
OL-28826-01
Chapter 63 Configuring Quality of Service
Quality of Service Policy Page
QoS Class Dialog Box—Queuing and Congestion Avoidance Tab
Use the Queuing and Congestion Avoidance tab of the QoS Class dialog box to perform Class-Based
Weighted Fair Queuing (CBWFQ) on the output traffic in the selected QoS class. Queuing prioritizes
traffic and manages congestion on your network by determining the order in which packets are sent out
over an interface. Queuing and congestion avoidance applies only to interface classes for output traffic.
The fields displayed in the Queuing tab depend on whether you are defining a specific QoS class or the
default class (by selecting Set as Default Class), and also by the type of router and the Cisco IOS
software version.
Navigation Path
Go to the QoS Class Dialog Box, then click the Queuing and Congestion Avoidance tab.
Related Topics
• Defining QoS Class Queuing Parameters, page 63-16
• Defining QoS on Interfaces, page 63-10
• Defining QoS on the Control Plane, page 63-12
• Quality of Service Policy Page, page 63-19
Field Reference
Precedence The precedence value with which to mark the traffic in this class:
• network (7)
• internet match (6)
• critical (5)
• flash-override (4)
• flash (3)
• immediate (2)
• priority (1)
• routine (0)
DSCP The DSCP value (0 to 63) with which to mark the traffic in this class.
Table 63-7 QoS Class Dialog Box—Marking Tab (Continued)
Element Description
Table 63-8 QoS Class Dialog Box—Queuing and Congestion Avoidance Tab
Element Description
Enable Queuing and
Congestion Avoidance
Whether to configure queuing and congestion avoidance properties in
the QoS class.