Mapping Dscp Or Cos Values To An Egress Queue And To A Threshold Id - Cisco WS-C3560-48PS-S Software Configuration Manual

Chapter 28 Configuring QoS
Command
Step 7 show mls qos interface [interface-id]
buffers
Step 8
copy running-config startup-config
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 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 gigabitethernet0/1
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.
Beginning in privileged EXEC mode, follow these steps to map DSCP or CoS values to an egress queue
and to a threshold ID. This procedure is optional.
78-16156-01
Purpose
Verify your entries.
(Optional) Save your entries in the configuration file.
Catalyst 3560 Switch Software Configuration Guide
Configuring Standard QoS
28-59