Cisco Systems 3750E manual Mls qos queue-set output qset-id, Queue-set qset-id, 36-75

Chapter 36 Configuring QoS

Configuring Standard QoS

Beginning in privileged EXEC mode, follow these steps to configure the memory allocation and to drop thresholds for a queue-set. This procedure is optional.

	Command	Purpose
Step 1
	configure terminal	Enter global configuration mode.
Step 2
	mls qos queue-set output qset-id	Allocate buffers to a queue-set.
	buffers allocation1 ... allocation4	By default, all allocation values are equally mapped among the four
		queues (25, 25, 25, 25). Each queue has 1/4 of the buffer space.
		• For qset-id,enter the ID of the queue-set. The range is 1 to 2. Each
		port belongs to a queue-set, which defines all the characteristics of the
		four egress queues per port.
		• For allocation1 ... allocation4, specify four percentages, one for each
		queue in the queue-set. For allocation1, allocation3, and allocation4,
		the range is 0 to 99. For allocation2, the range is 1 to 100 (including
		the CPU buffer).
		Allocate buffers according to the importance of the traffic; for example,
		give a large percentage of the buffer to the queue with the highest-priority
		traffic.
Step 3
	mls qos queue-set output qset-id	Configure the WTD thresholds, guarantee the availability of buffers, and
	threshold queue-id drop-threshold1	configure the maximum memory allocation for the queue-set (four egress
	drop-threshold2 reserved-threshold	queues per port).
	maximum-threshold	By default, the WTD thresholds for queues 1, 3, and 4 are set to 100
		percent. The thresholds for queue 2 are set to 200 percent. The reserved
		thresholds for queues 1, 2, 3, and 4 are set to 50 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 port 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.
		Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-02			36-75