Cisco Systems A9014CFD manual Individual Policing, Gigabitethernet port, 24-15

Chapter 24 Configuring QoS

Understanding QoS

Individual Policing

Individual policing applies only to input policy maps. In policy-map configuration mode, use the class command followed by class-map name, and enter policy-map class configuration mode. Effective with Cisco IOS Release 15.3(3)S, the Cisco ASR 901 supports policing ingress traffic over the cross connect EVC, similar to bridge domain service policy.

Use the police policy-map class configuration command to define the policer, the committed rate limitations of the traffic, committed burst size limitations of the traffic, and the action to take for a class of traffic that is below the limits (conform-action) and above the limits (exceed-action). If you do not specify burst size (bc), the system calculates an appropriate burst size value. The calculated value is appropriate for most applications.

To make the policy map effective, attach it to a physical port by using the service-policy input interface configuration command. Policing is done only on received traffic, so you can only attach a policer to an input service policy.

Note The QoS-group precedes the CoS value that is matched in the class-map, when the set qos-groupcommand is used along with MPLS experimental imposition.

Restrictions

•Only byte counters are supported.

•Only drop and pass counters are supported.

•If an ingress cross connect policer is attached to a physical interface, an ingress cross connect policer cannot be attached to EVC’s under the specific physical port.

•Applying or removing the policy-map on a cross connect interface requires shutdown or no shutdown on the interface.

•User class based MPLS experimental imposition is supported only for user classes based on CoS match.

•Supports policy-map on 254 ingress cross connect interfaces only.

•Dynamic modification of policy-maps (modifying a policy-map or class-map while it is attached to an interface) is not supported for the policy-maps applied on cross connect.

Configuration Examples

	The following is a sample configuration of basic policing for all traffic received with a CoS of 4. The
	first value following the police command limits the average traffic rate to 10, 000,000 bits per second
	(bps); the second value represents the additional burst size (10 kilobytes). The policy is assigned to
	gigabitethernet port 1.
	Router(config)# class-map video-class
	Router(config-cmap)# match cos 4
	Router(config-cmap)# exit
	Router(config)# policy-map video-policy
	Router(config-pmap)# class video-class
	Router(config-pmap-c)# police 10000000 10000
	Router(config-pmap-c-police)# exit
	Router(config-pmap-c)# exit
	Router(config-pmap)# exit
	Router(config)# interface gigabitethernet0/1
	Router(config-if)#service-policy input video-policy
	Router(config-if)# exit
	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		24-15