Configuring The Egress Expedite Queue; Allocating Bandwidth Among Egress Queues - Cisco WS-C3550-12G Software Configuration Manual
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Configuring QoS
Configuring the Egress Expedite Queue
You can ensure that certain packets have priority over all others by queuing them in the egress expedite
queue. This queue is serviced until it is empty and before the other queues are serviced.
Beginning in privileged EXEC mode, follow these steps to enable the egress expedite queue:
Command
Step 1
configure terminal
Step 2
mls qos
Step 3
interface interface-id
Step 4
priority-queue out
Step 5
end
Step 6
show running-config
Step 7
copy running-config startup-config
To disable the egress expedite queue, use the no priority-queue out interface configuration command.
Allocating Bandwidth among Egress Queues
You need to specify how much of the available bandwidth is allocated to each queue. The ratio of the
weights is the ratio of frequency in which the WRR scheduler drops packets from each queue.
Beginning in privileged EXEC mode, follow these steps to allocate bandwidth to each queue:
Command
Step 1
configure terminal
Step 2
mls qos
Step 3
interface interface-id
Catalyst 3550 Multilayer Switch Software Configuration Guide
20-50
Purpose
Enter global configuration mode.
Enable QoS on the switch.
Enter interface configuration mode, and specify the egress
Gigabit-capable Ethernet interface.
Enable the egress expedite queue, which is disabled by default.
When you configure this command, the WRR weight and queue size
ratios are affected because there is one fewer queue participating in
WRR. This means that weight4 in the wrr-queue bandwidth command
is ignored (not used in the ratio calculation).
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Enable QoS on the switch.
Enter interface configuration mode, and specify the egress
Gigabit-capable Ethernet interface.
Chapter 20
Configuring QoS
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