Cisco 300 Series Cli Manual page 804

Small business 300 series managed switches command line interface guide release 1.3

Table of Contents

Quality of Service (QoS) Commands

Default Configuration

The default state is according to the mode selected in the

(advanced mode). The type of trust is determined in

qos advanced-mode

Command Mode

Policy-map Class Configuration mode

User Guidelines

Use this command to distinguish the QoS trust behavior for certain traffic from

others. For example, incoming traffic with certain DSCP values can be trusted. A

class map can be configured to match and trust the DSCP values in the incoming

The type of trust is determined in

qos advanced-mode

Trust values set with this command supersede trust values set on specific

interfaces with the

qos trust (Interface)

Interface Configuration mode command.

commands are mutually exclusive within the same policy map.

Policy maps, which contain set or trust commands or that have ACL classification

to an egress interface, cannot be attached by using the

service-policy

Configuration mode command.

If specifying trust cos, QoS maps a packet to a queue, the received or default port

CoS value, and the CoS-to-queue map.

The following example creates an ACL, places it into a class map, places the class

map into a policy map and configures the trust state using the DSCP value in the

ingress packet.

switchxxxxxx(config)# ip access-list extended ip1

switchxxxxxx(config-mac-al)# permit ip any any

switchxxxxxx(config-mac-al)# exit

switchxxxxxx(config)# class-map c1

switchxxxxxx(config-cmap)# match access-group ip1

switchxxxxxx(config-cmap)# exit

switchxxxxxx(config)# policy-map p1

switchxxxxxx(config-pmap)# class c1

78-21075-01 Command Line Interface Reference Guide