Cisco Systems SPS2024, SPS208G, SPS224G4

QoS Commands

trust

SPS208G/SPS224G4/SPS2024 Command Line Interface Reference Guide 278

User Guidelines

•Use this command to distinguish the quality of service (QoS) trust behavior

for certain traffic from others. For example, incoming traffic with certain

DSCP values can be trusted. Configure a class map to match and trust the

DSCP values in the incoming traffic.

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

interfaces with the qos trust interface configuration command.

•The trust command is mutually exclusive with set policy-map class

configuration command within the same policy map.

•Policy maps that contain set or trust policy-map class configuration

commands or with access control list (ACL) classification to an egress

interface cannot be attached by using the service-policy interface

configuration command.

•If trust cos is specified, QoS maps a packet to a queue to the received or

default port CoS value and the CoS-to-queue map.

•If trust dscp is specified, QoS maps the packet by using the DSCP value

from the ingress packet.

•If tcp-udp-port is specified, QoS maps the packet to queue by using the

TCP\UDP port value from the ingress packet and the tcp-udp-port-to-

queue map.

Example

The following example configures the trust state for a class called ‘class1’ in a

policy map called ‘policy1’.

Console (config)# policy-map policy1

Console (config-pmap)# class class1

Console (config-pmap-c)# trust cos dscp