Cisco Systems SPS224G4 Manual De Usuario

trust

SPS208G/SPS224G4/SPS2024 Command Line Interface Reference Guide

278

•

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.

The following example configures the trust state for a class called ‘class1’ in a 
policy map called ‘policy1’.