Cisco Systems A9014CFD manual Configuring Class-Based Weighted Fair Queuing Cbfq, 24-45

Chapter 24 Configuring QoS

Configuring Quality of Service (QoS)

Configuring Class-Based Weighted Fair Queuing (CBFQ)

The Cisco ASR 901 supports Class-Based Weighted Fair Queuing (CBWFQ) for congestion management.

Complete the following steps to configure CBWFQ.

Step 1 A class map contains match criteria against which a packet is checked to determine if it belongs to the class. You can use class maps to define criteria that are referenced in one or more policy maps. Complete the following steps to configure a class map.

a.Use the class-mapcommand to create a class map.

Router(config)# class-map class1

Router(config-cmap)#

b.Use the match command to specify the match criteria for the class map. You can define a variety of match criteria including CoS, DSCP, MPLS Exp, or QoS group value.

Router(config-cmap)# match qos-group 7

c.Use the exit command to exit class map configuration.

Router(config-cmap)# exit

Router(config)#

Step 2 Complete the following steps to configure a policy map and attach it to an interface.

Note The Cisco ASR 901 does not support the queue-limitcommands. Only random-detectdiscard-class-basedis supported on GigabitEthernet Interfaces.

a.Use the policy-mapcommand to define a policy map.

Router(config)# policy-map policy1

Router(config-pmap)#

b.Use the class command to reference the class map that defines the traffic to which the policy map applies.

Router(config-pmap)# class class1

Router(config-pmap-c)#

c.Use the bandwidth command to specify the bandwidth allocated for the traffic class.

Router(config-pmap-c)# bandwidth percent 10

d.Use the exit command to exit the policy map class configuration.

Router(config-pmap-c)# exit

Router(config-pmap)#

e.Use the exit command to exit the policy map configuration.

Router(config-pmap)# exit

Router(config)#

f.Enter configuration for the interface to which you want to apply the policy map.

Router(config)# interface atm0/ima0

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		24-45