Troubleshooting Auto Qos Commands; Displaying Auto-Qos Information - Cisco Catalyst 2975 Software Configuration Manual

Displaying Auto-QoS Information

Command
auto qos trust {cos | dscp}
Step 4 exit
Step 5 interface interface-id
Step 6 auto qos trust
Step 7 end
Step 8
show auto qos interface interface-id

Troubleshooting Auto QoS Commands

To display the QoS commands that are automatically generated when auto-QoS is enabled or disabled,
enter the debug auto qos privileged EXEC command before you enable auto-QoS. For more
information, see the debug autoqos command in the command reference for this release.
To disable auto-QoS on a port, use the no form of the auto qos command interface configuration
command, such as no auto qos voip. Only the auto-QoS-generated interface configuration commands
for this port are removed. If this is the last port on which auto-QoS is enabled and you enter the no auto
qos voip command, auto-QoS is considered disabled even though the auto-QoS-generated global
configuration commands remain (to avoid disrupting traffic on other ports affected by the global
configuration).
You can use the no mls qos global configuration command to disable the auto-QoS-generated global
configuration commands. With QoS disabled, there is no concept of trusted or untrusted ports because
the packets are not modified (the CoS, DSCP, and IP precedence values in the packet are not changed).
Traffic is switched in pass-through mode (packets are switched without any rewrites and classified as
best effort without any policing).
Displaying Auto-QoS Information
To display the initial auto-QoS configuration, use the show auto qos [interface [interface-id]]
privileged EXEC command. To display any user changes to that configuration, use the show
running-config privileged EXEC command. You can compare the show auto qos and the show
running-config command output to identify the user-defined QoS settings.
To display information about the QoS configuration that might be affected by auto-QoS, use one of these
commands:
•
•
•
Catalyst 2975 Switch Software Configuration Guide
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show mls qos
show mls qos maps cos-dscp
show mls qos interface [interface-id] [buffers | queueing]
Purpose
Enable auto-QoS for trusted interfaces.
• cos—Class of service.
• dscp—Differentiated Services Code Point.
Return to global configuration mode.
Specify the switch port identified as connected to a trusted switch or
router, and enter interface configuration mode.
Enable auto-QoS on the port, and specify that the port is connected to
a trusted router or switch.
Return to privileged EXEC mode.
Verify your entries.
This command displays the auto-QoS command on the interface on
which auto-QoS was enabled. You can use the show running-config
privileged EXEC command to display the auto-QoS configuration
and the user modifications.
Chapter 33 Configuring QoS
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