Cisco IE 3000 User Manual

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Cisco IE 3000 Switch Software Configuration Guide
OL-13018-01
Chapter 32 Configuring QoS
Configuring Standard QoS
This example shows how to assign the ingress bandwidth to the queues. Priority queueing is disabled,
and the shared bandwidth ratio allocated to queue 1 is 25/(25+75) and to queue 2 is 75/(25+75):
Switch(config)# mls qos srr-queue input priority-queue 2 bandwidth 0
Switch(config)# mls qos srr-queue input bandwidth 25 75
Configuring the Ingress Priority Queue
You should use the priority queue only for traffic that needs to be expedited (for example, voice traffic,
which needs minimum delay and jitter).
The priority queue is guaranteed part of the bandwidth to reduce the delay and jitter under heavy network
traffic on an oversubscribed ring (when there is more traffic than the backplane can carry, and the queues
are full and dropping frames).
SRR services the priority queue for its configured weight as specified by the bandwidth keyword in the
mls qos srr-queue input priority-queue queue-id bandwidth weight global configuration command.
Then, SRR shares the remaining bandwidth with both ingress queues and services them as specified by
the weights configured with the mls qos srr-queue input bandwidth weight1 weight2 global
configuration command.
Beginning in privileged EXEC mode, follow these steps to configure the priority queue. This procedure
is optional.
To return to the default setting, use the no mls qos srr-queue input priority-queue queue-id global
configuration command. To disable priority queueing, set the bandwidth weight to 0, for example, mls
qos srr-queue input priority-queue queue-id bandwidth 0.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
mls qos srr-queue input
priority-queue queue-id bandwidth
weight
Assign a queue as the priority queue and guarantee bandwidth on the
internal ring if the ring is congested.
By default, the priority queue is queue 2, and 10 percent of the bandwidth
is allocated to it.
• For queue-id, the range is 1 to 2.
• For bandwidth weight, assign the bandwidth percentage of the
internal ring. The range is 0 to 40. The amount of bandwidth that can
be guaranteed is restricted because a large value affects the entire ring
and can degrade performance.
Step 3
end Return to privileged EXEC mode.
Step 4
show mls qos interface queueing
or
show mls qos input-queue
Verify your entries.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.

Cisco IE 3000 Specifications

General

Brand	Cisco
Model	IE 3000
Category	Switch
Language	English