Objectives

Upon completing this lesson, you will be able to use class-based marking to assign packets to a specific service class. This ability includes being able to meet these objectives:

■ Describe the MQC class-based marking system

■ Describe the different IP packet-marking options available in class-based marking

■ Identify the Cisco IOS commands required to configure class-based marking

■ Identify the Cisco IOS commands required to mark IP packets using CoS with class-based marking

■ Identify the Cisco IOS commands required to mark IP packets using IP precedence with class-based marking

■ Identify the Cisco IOS commands required to mark IP packets using DSCP with class-based marking

■ Identify the Cisco IOS commands used to monitor class-based marking

This topic describes the MQC class-based marking mechanism.

This topic describes the MQC class-based marking mechanism.

Marking packets or frames sets information in the Layer 2 and Layer 3 headers of a packet so that the packet or frame can be identified and distinguished from other packets or frames.

MQC provides packet-marking capabilities using class-based marking. MQC is the most flexible Cisco IOS marking tool, extending the marking functionality of committed access rate (CAR) and policy routing.

You can use class-based marking on input or output of interfaces as part of a defined input or output service policy. On input, you can combine class-based marking with class-based policing, and on output, with any other class-based weighted fair queuing (CBWFQ) QoS feature.

This topic describes the different IP packet marking options that are available in class-based marking.

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