Cisco Systems 3130 User Manual

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Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide

OL-13270-01

Chapter 36 Configuring QoS

Configuring Standard QoS

Beginning in privileged EXEC mode, follow these steps to modify the CoS-to-DSCP map. This
procedure is optional.

To return to the default map, use the no mls qos cos-dscp global configuration command.

This example shows how to modify and display the CoS-to-DSCP map:

Switch(config)# mls qos map cos-dscp 10 15 20 25 30 35 40 45

Switch(config)# end

Switch# show mls qos maps cos-dscp

Cos-dscp map:

cos: 0 1 2 3 4 5 6 7

--------------------------------

dscp: 10 15 20 25 30 35 40 45

Configuring the IP-Precedence-to-DSCP Map

You use the IP-precedence-to-DSCP map to map IP precedence values in incoming packets to a DSCP
value that QoS uses internally to represent the priority of the traffic.

Table 36-13

shows the default IP-precedence-to-DSCP map:

If these values are not appropriate for your network, you need to modify them.

Command

Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

mls qos map cos-dscp dscp1...dscp8

Modify the CoS-to-DSCP map.

For dscp1...dscp8, enter eight DSCP values that correspond to CoS values
0 to 7. Separate each DSCP value with a space.

The DSCP range is 0 to 63.

Step 3

end

Return to privileged EXEC mode.

Step 4

show mls qos maps cos-dscp

Verify your entries.

Step 5

copy running-config startup-config

(Optional) Save your entries in the configuration file.

Table 36-13

Default IP-Precedence-to-DSCP Map

IP Precedence Value

DSCP Value