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Catalyst 2928 Switch Software Configuration Guide
OL-23389-01
Chapter 31 Configuring QoS
Configuring Standard QoS
To return to the default CoS output queue threshold map, use the
no mls qos srr-queue output cos-map
global configuration command.
Configuring the Egress Expedite Queue
You can ensure that certain packets have priority over all others by queuing them in the egress expedite
queue. SRR services this queue until it is empty before servicing the other queues.
Beginning in privileged EXEC mode, follow these steps to enable the egress expedite queue. This
procedure is optional.
To disable the egress expedite queue, use the
no priority-queue out
interface configuration command.
This example shows how to enable the egress expedite queue.
Switch(config)#
interface gigabitethernet0/1
Switch(config-if)#
priority-queue out
Switch(config-if)#
end
Step 4
show mls qos maps
Verify your entries.
The CoS output queue threshold map shows the CoS value in the top row
and the corresponding queue ID and threshold ID in the second row; for
example, queue 2 and threshold 2 (2-2).
Step 5
copy running-config startup-config
(Optional) Save your entries in the configuration file.
Command
Purpose
Command
Purpose
Step 1
configure terminal
Enter global configuration mode.
Step 2
mls qos
Enable QoS on a switch.
Step 3
interface
interface-id
Specify the egress port, and enter interface configuration mode.
Step 4
priority-queue out
Enable the egress expedite queue, which is disabled by default.
When you configure this command, the SRR weight and queue size ratios
are affected because there is one less queue participating in SRR.
Step 5
end
Return to privileged EXEC mode.
Step 6
show running-config
Verify your entries.
Step 7
copy running-config startup-config
(Optional) Save your entries in the configuration file.
