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5.3 Class of Service (CoS) Commands

This chapter provides a detailed explanation of the QoS CoS commands. The following commands are

available.

The commands are divided into these different groups:

z Configuration Commands are used to configure features and options of the switch. For every con-

figuration command there is a show command that will display the configuration setting.

z Show commands are used to display device settings, statistics and other information.

Note: The 'Interface Config' mode only affects a single interface, whereas the 'Global Con-

fig' mode is applied to all interfaces.

5.3.1 classofservice dot1p-mapping

This command maps an 802.1p priority to an internal traffic class. The userpriority and trafficclass can

both range from 0-7.

Format classofservice dot1p-mapping <userpriority> <trafficclass>

Modes Global Config

5.3.1.1 no classofservice dot1p-mapping

This command restores the default mapping of the 802.1p priority to an internal traffic class.

Format no classofservice dot1p-mapping

Modes Global Config

5.3.2 classofservice trust

This command sets the class of service trust mode of an interface. The mode can be set to trust one of

the Dot1p (802.1p) or IP DSCP packet markings.

Format classofservice trust dot1p

Mode Global Config

Interface Config

5.3.2.1 no classofservice trust

This command sets the interface mode to untrusted, i.e. the packet priority marking is ignored.

Format no classofservice trust

Modes Global Config

Interface Config

5.3.3 cos-queue max-bandwidth

This command specifies the maximum transmission bandwidth limit for each interface queue. Also

known as rate shaping, this has the effect of smoothing temporary traffic bursts over time so that the

transmitted traffic rate is bounded. The switch supports 8 queues per interface. A value from 0-100

(percentage of link rate) must be specified for each supported queue, with 0 indicating no maximum

bandwidth is in effect.

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