Cisco 4500M Command Reference

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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
qos rewrite ip dscp
qos rewrite ip dscp
To enable DSCP rewrite for IP packets, use the qos rewrite ip dscp command. To disable IP DSCP
rewrite, use the no form of the command.
qos rewrite ip dscp
no qos rewrite ip dscp
Syntax Description This command has no arguments or keywords.
Defaults IP DSCP rewrite is enabled.
Command Modes Global configuration
Command History
Usage Guidelines If you disable IP DSCP rewrite and enable QoS globally, the following events occur:
• The ToS byte on the IP packet is not modified.
• Marked and marked-down DSCP values are used for queueing.
• The internally derived DSCP (as per the trust configuration on the interface or VLAN policy) is used
for transmit queue and Layer 2 CoS determination. The DSCP is not rewritten on the IP packet
header.
If you disable QoS, the CoS and DSCP of the incoming packet are preserved and are not rewritten.
Examples The following example shows how to disable IP DSCP rewrite:
Switch(config)# no qos rewrite ip dscp
Switch(config)#
Related Commands qos (global configuration mode)
show qos
Release Modification
12.2(18)EW Support for this command was introduced on the Catalyst 4500 series switch.

Cisco 4500M Specifications

General

Brand	Cisco
Model	4500M
Category	Network Router
Language	English