Cisco Systems 3750E manual 36-76

Chapter 36 Configuring QoS

Configuring Standard QoS

	Command	Purpose
Step 7
	show mls qos interface [interface-id]	Verify your entries.
	buffers
Step 8
	copy running-config startup-config	(Optional) Save your entries in the configuration file.

To return to the default setting, use the no mls qos queue-set output qset-idbuffers global configuration command. To return to the default WTD threshold percentages, use the no mls qos queue-set output qset-idthreshold [queue-id] global configuration command.

This example shows how to map a port 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 that 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 gigabitethernet1/0/1

Switch(config-if)# queue-set 2

Mapping DSCP or CoS Values to an Egress Queue and to a Threshold ID

You can prioritize traffic by placing packets with particular DSCPs or costs of service into certain queues and adjusting the queue thresholds so that packets with lower priorities are dropped.

Note The egress queue default settings are suitable for most situations. You should change them only when you have a thorough understanding of the egress queues and if these settings do not meet your QoS solution.

	Catalyst 3750-E and 3560-E Switch Software Configuration Guide
36-76	OL-9775-02