Specifications

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Catalyst 2970 Switch Software Configuration Guide
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Chapter 27 Configuring QoS
Configuring Standard QoS
To return to the default setting, use the no mls qos queue-set output qset-id buffers global configuration
command. To return to the default WTD threshold percentages, use the no mls qos queue-set output
qset-id threshold [queue-id] global configuration command.
This example shows how to map Gigabit Ethernet interface 0/1 to queue-set 2. It allocates 40 percent of
the buffer space to egress queue 1 and 20 percent to egress queues 2, 3, and 4. It configures the drop
thresholds for queue 2 to 40 and 60 percent of the allocated memory, guarantees (reserves) 100 percent
of the allocated memory, and configures 200 percent as the maximum memory this queue can have
before packets are dropped:
Switch(config)# mls qos queue-set output 2 buffers 40 20 20 20
Switch(config)# mls qos queue-set output 2 threshold 2 40 60 100 200
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# queue-set 2
Step 3
mls qos queue-set output qset-id
threshold queue-id drop-threshold1
drop-threshold2 reserved-threshold
maximum-threshold
Configure the WTD thresholds, guarantee the availability of buffers, and
configure the maximum memory allocation for the queue-set (four egress
queues per port).
By default, the WTD thresholds for queues 1, 3, and 4 are set to 100
percent. The thresholds for queue 2 are set to 50 percent. The reserved
thresholds for queues 1, 3, and 4 are set to 50 percent. The reserved
threshold for queue 2 is set to 100 percent. The maximum thresholds for
all queues are set to 400 percent.
• For qset-id, enter the ID of the queue-set specified in Step 2. The
range is 1 to 2.
• For queue-id, enter the specific queue in the queue-set on which the
command is performed. The range is 1 to 4.
• For drop-threshold1 drop-threshold2, specify the two WTD
thresholds expressed as a percentage of the queue’s allocated
memory. The range is 1 to 400 percent.
• For reserved-threshold, enter the amount of memory to be guaranteed
(reserved) for the queue expressed as a percentage of the allocated
memory. The range is 1 to 100 percent.
• For maximum-threshold, enable a queue in the full condition to obtain
more buffers than are reserved for it. This is the maximum memory
the queue can have before the packets are dropped if the common pool
is not empty. The range is 1 to 400 percent.
Step 4
interface interface-id Specify the interface of the outbound traffic, and enter interface
configuration mode.
Step 5
queue-set qset-id Map the port to a queue-set.
For qset-id, enter the ID of the queue-set specified in Step 2. The range is
1 to 2. The default is 1.
Step 6
end Return to privileged EXEC mode.
Step 7
show mls qos interface [interface-id]
buffers
Verify your entries.
Step 8
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose