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QoS Commands
trust
SPS208G/SPS224G4/SPS2024 Command Line Interface Reference Guide 278
23
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