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5-66

Quality of Service: Managing Bandwidth More Effectively

Globally-Configured QoS

Example. In this example, you assign the following DSCP policies (code-

point and associated 802.1p priority) to matching packets with the specified

source-ports:

1. Determine if the DSCP codepoints that you want to use to mark matching

packets already have an 802.1p priority assigned, which could indicate

use by existing applications (show qos dscp-map command). This is not a

problem as long as the configured priorities are acceptable for all appli-

cations using the same DSCP.

Also, note that a DSCP must have an 802.1p priority configured before you

can use it to mark matching packets. If necessary, use the qos dscp-map

< codepoint > priority < 0 - 7 > command to configure the DSCP policy

(codepoint and associated 802.1p priority) that you want to use to mark

matching packets.

Syntax: interface < port-list > qos dscp < codepoint >

The DSCP policy includes an 802.1p priority and determines

the packet’s queue in the outbound port to which it is sent. If

the packet leaves the switch on a tagged port, it carries the

802.1p priority with it to the next downstream device.

(Default: No-override)

Syntax: no interface [e] < port-list > qos

Removes a QoS classifier for the specified source-port(s).

Syntax: show qos source-port

Displays a listing of all source-port QoS classifiers currently

in the running-config file.

Source-Port DSCP Priority

A2 000111 7

B1-B3 000101 5

B4, C2 000010 1

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