Cisco Catalyst 3550 Series User Manual

29-66
Catalyst 3550 Multilayer Switch Software Configuration Guide
78-11194-09
Chapter 29 Configuring QoS
Configuring Standard QoS
To return to the default minimum-reserve buffer size, use the no mls qos min-reserve 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 20 packets and to assign
minimum-reserve level 5 to egress queue 1 on the Fast Ethernet interface 0/1:
Switch(config)# mls qos min-reserve 5 20
Switch(config)# interface fastethernet0/1
Switch(config-if)# wrr-queue min-reserve 1 5
Configuring the Egress Expedite Queue
You can ensure that certain packets have priority over all others by queuing them in the egress expedite
queue. WRR services this queue until it is empty before servicing the other queues.
Step 3
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 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.
When you enter this command, the queue is temporarily shutdown
during the hardware reconfiguration, and the switch drops newly
arrived packets to this queue.
Step 4
interface interface-id Enter interface configuration mode, and specify the egress 10/100
Ethernet interface.
Step 5
wrr-queue min-reserve queue-id
min-reserve-level
Assign a minimum-reserve level number to a particular egress queue.
By default, queue 1 selects minimum-reserve level 1, queue 2 selects
minimum-reserve level 2, queue 3 selects minimum-reserve level 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 more
information, see the “Configuring the Egress Expedite Queue”
section on page 29-66.
• For min-reserve-level, specify the minimum-reserve level
configured in Step 3.
Step 6
end Return to privileged EXEC mode.
Step 7
show mls qos interface buffers Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose

Cisco Catalyst 3550 Series Specifications

General

Brand	Cisco
Model	Catalyst 3550 Series
Category	Network Router
Language	English