Reference Guide

766 Quality of Service (QoS) Commands
FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\CLI Folders\Dell Plasma-ARC
2+3\new_system_mifs_ARC2_latest\QoS.fm
DELL CONFIDENTIAL – PRELIMINARY 4/3/14 - FOR PROOF ONLY
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 traffic.
Trust values set with this command supersede trust values set on specific
interfaces with the
qos trust (Interface) Interface Configuration mode
command.
The
trust and set 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
Interface 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.
Example
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.
console(config)# ip access-list extended ip1
console(config-ip-al)#
permit ip any any
console(config-ip-al)# exit
console(config)# class-map c1
console(config-cmap)#
match access-group ip1
console(config-cmap)# exit
console(config)# policy-map p1
console(config-pmap)#
class c1
console(config-pmap-c)# trust cos-dscp