Cisco Systems A9014CFD manual Egress Policing, Configuration Example, 24-17

Chapter 24 Configuring QoS

Understanding QoS

This example shows how to use the priority percent command to configure out-class1as the priority queue, with traffic going to the queue limited to 20,000,000 bps so that the priority queue never uses more than that. Traffic above that rate is dropped. This allows other traffic queues to receive some port bandwidth, in this case a minimum bandwidth guarantee of 50% and 20%. The class class-defaultqueue gets the remaining port bandwidth.

Router(config)# policy-map policy1

Router(config-pmap)# class out-class1

Router(config-pmap-c)# priority percent 20

Router(config-pmap-c)# exit

Router(config-pmap)# class out-class2

Router(config-pmap-c)# bandwidth percent 50

Router(config-pmap-c)# exit

Router(config-pmap)# class out-class3

Router(config-pmap-c)# bandwidth percent 20

Router(config-pmap-c)# exit

Router(config-pmap)# exit

Router(config)# interface gigabitethernet0/1

Router(config-if)#service-policy output policy1

Router(config-if)# exit

Egress Policing

Egress policing can be classified based on QoS-groups, DSCP, and precedence value. For QoS-groups to work at egress, you should map the traffic at ingress to a specific QoS-group value.

Restrictions

•Egress policing is supported only on the physical interface (policy-maps are applied only at port level).

•Egress policing on EVC is not supported.

•Egress policing supports up to 64 policers.

•Only byte counters are supported.

•Only drop and pass counters are supported.

•Policing and queuing are not supported together in a policy-map.

•Hierarchical egress policing is not supported.

Configuration Example

This is an example for egress policing on a physical interface:

class-map match-all dscp1 match ip dscp 1 class-map match-all Q1 match qos-group 1 policy-map ingress class dscp1

	set qos-group 1
	policy-map egress
	class Q1
	police cir 5000000
	int gig 0/1
	service-policy input ingress
	int gig 0/0
	service-policy output egress
	end
	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		24-17