Limiting The Egress Bandwidth On A Queue-Set - Cisco Catalyst 3750 Software Configuration Manual
Metro switch
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Also See for Catalyst 3750:
- Command reference manual (1154 pages) ,
- Hardware installation manual (231 pages) ,
- Message manual (120 pages)
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Configuring Standard QoS
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
srr-queue bandwidth share weight1
weight2 weight3 weight4
Step 4
end
Step 5
show mls qos interface interface-id
queueing
Step 6
copy running-config startup-config
To return to the default setting, use the no srr-queue bandwidth share interface configuration
command.
This example shows how to configure the weight ratio of the SRR scheduler running on an egress port.
Four queues are used, and the bandwidth ratio allocated for each queue in shared mode is 1/(1+2+3+4),
2/(1+2+3+4), 3/(1+2+3+4), and 4/(1+2+3+4), which is 10 percent, 20 percent, 30 percent, and 40
percent for queues 1, 2, 3, and 4. This means that queue 4 has four times the bandwidth of queue 1, twice
the bandwidth of queue 2, and one-and-a-third times the bandwidth of queue 3.
Switch(config)# interface gigabitethernet1/0/1
Switch(config-if)# srr-queue bandwidth share 1 2 3 4
Limiting the Egress Bandwidth on a Queue-Set
You can limit the egress bandwidth on a standard port mapped to a queue-set. For example, if a customer
pays only for a small percentage of a high-speed link, you can limit the bandwidth to that amount.
Note
The egress queue-set default settings are suitable for most situations. You should change them only when
you have a thorough understanding of the queues and only if these settings do not meet your QoS
solution.
Beginning in privileged EXEC mode, follow these steps to limit the egress bandwidth on a standard port.
This procedure is optional.
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
srr-queue bandwidth limit weight1
Catalyst 3750 Metro Switch Software Configuration Guide
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Purpose
Enter global configuration mode.
Specify a port, and enter interface configuration mode.
Assign SRR weights to the egress queues.
By default, all four weights are 25 (1/4 of the bandwidth is allocated to
each queue).
For weight1 weight2 weight3 weight4, enter the weights to control the
ratio of the frequency in which the SRR scheduler sends packets. Separate
each value with a space. The range is 1 to 255.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Purpose
Enter global configuration mode.
Specify a standard port to be rate-limited, and enter interface
configuration mode.
Specify the percentage of the port speed to which the port should be
limited. The range is 10 to 90. This command is not supported on an ES
port.
By default, the port is not rate limited and is set to 100 percent.
Chapter 26
Configuring QoS
78-15870-01
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Troubleshooting
