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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter20 Configuring QoS Configuring QoS
Configuring the Minimum-Reserve Levels
You can configure the buffer size of the minimum-reserve levels on all 10/100 ports and assign the
minimum-reserve level to an egress queue on a 10/100 Ethernet port.
Beginning in privileged EXEC mode, follow these steps to configur e t he e gress que ue si ze s:
To return to the default minimum-reserve buffer si ze, use the no mls qos min-r eserve min-reserve-level
global configuration command. To return to the default queue selection of the minimum-reserve level,
use the no wrr-queue min-reserve queue-id interface configuration command.
This example shows how to configure minimum-reserve level 5 to 2 0 pa ckets a nd to assig n
minimum-reserve level 5 to egress queue 1 on the Fast Etherne t 0/ 1 i nte rfac e 0/ 1:
Switch(config)# mls qos min-reserve 5 20
Switch(config)# interface fastethernet0/1
Switch(config-if)# wrr-queue min-reserve 1 5
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 mls qos Enable QoS on the switch.
Step3 mls qos min-reserve min-reserve-level
min-reserve-buffersize Configure the buffer size of the minimum-reserve level, if necessary,
for all the 10/100 Ethernet ports.
By default, the buffer size for all eight minimum-reserve levels is set
to 100 packets.
•For min-reserve-level, specify the minimum-reserve level number.
The range is 1 to 8.
•For min-reserve-buffersize, specify the buffer size. The range is 10
to 170 packets.
Step4 interface interface-id Enter interface configuration mode, and specify the egress 10/100
Ethernet interface.
Step5 wrr-queue min-reserve queue-id
min-reserve-level Assign a minimum-reserve level number to a particular egres s qu eu e.
By default, queue 1 selects minimum-reserve level 1, queue 2 selec ts
minimum-reserve level 2, queue 3 selects minimum-reserve le vel 3,
and queue 4 selects minimum-reserve level 4.
•For queue-id, specify the ID of the egress queue. The range is 1
to 4, where 4 can be configured as the expedite queue. For m ore
information, see the “Configuring the Egress Expedite Queue”
section on page 20-54.
•For min-reserve-level, specify the minimum-reserve level
configured in Step 3.
Step6 end Return to privileged EXEC mode.
Step7 show mls qos interface buffers Verify your entries.
Step8 copy running-config startup-config (Optional) Save your entries in the configuration file.