Cisco Systems A9014CFD manual Configuring Shaping, No random-detect discard-class-based, 24-47

Chapter 24 Configuring QoS

Configuring Quality of Service (QoS)

	Command	Purpose
Step 5
	[no] random-detect discard-class-based	Base WRED on the discard class value of a packet.
		To disable this feature, use the no form of this command.
Step 6
	[no] random-detect discard-class value	Configure WRED parameters for a discard-class value for a class policy
	min-threshold max-threshold	in a policy map.
	mark-prob-denominator	• value—Discard class. Valid values are 0 to 2.
	Example	Note WRED counters are not supported for discard class 0.
	Router(config-pmap-c)# random-detect
	discard-class 2 100 200 10	• min-threshold—Minimum threshold in number of packets. Valid
		values are 1 to 4096. When the average queue length reaches the
		minimum threshold, WRED randomly drops some packets with the
		specified IP precedence.
		• max-threshold—Maximum threshold in number of packets. Valid
		values are 1 to 4096. When the average queue length exceeds the
		maximum threshold, WRED drops all packets with the specified IP
		precedence.
		Note Max-threshold values configured above 1024 cannot be
		reached.
		• mark-prob-denominator—Denominator for the fraction of packets
		dropped when the average queue depth is at the maximum
		threshold. For example, if the denominator is 512, 1 out of every
		512 packets is dropped when the average queue is at the maximum
		threshold. Valid values are 1 to 65535. The default is 10; 1 out of
		every 10 packets is dropped at the maximum threshold.
		To return the values to the default for the discard class, use the no form
		of this command.

Configuring Shaping

The Cisco ASR 901 supports class-based traffic shaping. Follow these steps to configure class-based traffic shaping.

Class-based traffic shaping is configured using a hierarchical policy map structure; you enable traffic shaping on a primary level (parent) policy map and other QoS features such as queuing and policing on a secondary level (child) policy map.

This section contains the following topics:

•Configuring Class-Based Traffic Shaping in a Primary-Level (Parent) Policy Map

•Configuring the Secondary-Level (Child) Policy Map

Configuring Class-Based Traffic Shaping in a Primary-Level (Parent) Policy Map

Follow these steps to configure a parent policy map for traffic shaping.

Step 1 Use the policy-mapcommand to specify the policy map for which you want to configure shaping and enter policy-map configuration mode.

	Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09		24-47