Cisco Systems OL-4266-08 manual 42-109

Chapter 42 Configuring PFC QoS

Configuring PFC QoS

To allocate bandwidth between standard transmit queues, perform this task:

	Command	Purpose
Step 1
	Router(config)# interface type1 slot/port	Selects the interface to configure.
Step 2
	Router(config-if)#wrr-queue [bandwidth shape]	Allocates bandwidth between standard transmit queues:
	percent low_priority_queue_percentage	• Enter the bandwidth keyword to configure DWRR or
	[intermediate_priority_queue_percentages]
	high_priority_queue_percentage	WRR.
	Or:	• Enter the shape keyword to configure SRR. Use of
		SRR prevents use of the strict priority queue. To
	Router(config-if)#wrr-queue [bandwidth shape]
		configure SRR, any CoS or DSCP values mapped to
	low_priority_queue_weight
		a strict-priority queue must be remapped to a
	[intermediate_priority_queue_weights]
		standard queue (see the “Mapping QoS Labels to
	high_priority_queue_weight
		Queues and Drop Thresholds” section on
		page 42-98).
		• Percentages should add up to 100. You must enter
		percentages for all the standard transmit queues on
		the port. (Supported with Release 12.2(18)SXF and
		later releases.)
		• The valid values for weight range from 1 to 255. You
		must enter weights for all the standard transmit
		queues on the port.
	Router(config-if)#no wrr-queue [bandwidth	Reverts to the default bandwidth allocation.
	shape]
Step 3
	Router(config-if)# end	Exits configuration mode.
Step 4
	Router# show queueing interface type1 slot/port	Verifies the configuration.

1.type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet

This example shows how to allocate a 3-to-1 bandwidth ratio for Gigabit Ethernet port 1/2:

Router# configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

Router(config)# interface gigabitethernet 1/2

Router(config-if)#wrr-queue bandwidth 3 1

Router(config-if)# end

Router#

This example shows how to verify the configuration:

Router# show queueing interface gigabitethernet 1/2 include bandwidth

WRR bandwidth ratios:	3[queue 1]	1[queue 2]
Router#

	Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08		42-109