Cisco Catalyst 3560-X Software Configuration Manual page 973

Hide thumbs Also See for Catalyst 3560-X:

Table of Contents

Configuring QoS

A policy map also has these characteristics:

A policy map can contain multiple class statements, each with different match criteria and policers.

A policy map can contain a pre-defined default traffic class explicitly placed at the end of the map.

A separate policy-map class can exist for each type of traffic received through a port.

Follow these guidelines when configuring policy maps on physical ports:

You can attach only one policy map per ingress port.

If you configure the IP-precedence-to-DSCP map by using the mls qos map ip-prec-dscp

dscp1...dscp8 global configuration command, the settings only affect packets on ingress interfaces

that are configured to trust the IP precedence value. In a policy map, if you set the packet IP

precedence value to a new value by using the set ip precedence new-precedence policy-map class

configuration command, the egress DSCP value is not affected by the IP-precedence-to-DSCP map.

If you want the egress DSCP value to be different than the ingress value, use the set dscp new-dscp

policy-map class configuration command.

If you enter or have used the set ip dscp command, the switch changes this command to set dscp in

its configuration.

You can use the set ip precedence or the set precedence policy-map class configuration command

to change the packet IP precedence value. This setting appears as set ip precedence in the switch

configuration.

You can configure a separate second-level policy map for each class defined for the port. The

second-level policy map specifies the police action to take for each traffic class. For information on

configuring a hierarchical policy map, see the

by Using Hierarchical Policy Maps" section on page

A policy-map and a port trust state can both run on a physical interface. The policy-map is applied before

the port trust state.

When you configure a default traffic class by using the class class-default policy-map configuration

command, unclassified traffic (traffic that does not meet the match criteria specified in the traffic

classes) is treated as the default traffic class (class-default).

"Classifying, Policing, and Marking Traffic on SVIs

Catalyst 3750-X and 3560-X Switch Software Configuration Guide

Configuring Standard QoS

Troubleshooting

Catalyst 3750-x