Patton electronic SmartNode 4110 Series Defining random early detection, Discarding Excess Load

SmartWare Software Configuration Guide 13 • Link scheduler configuration

Defining random early detection

The command random-detectis used to request random early detection (RED). When a queue carries lots of TCP transfers that last longer than simple web requests, there is a risk that TCP flow-control might be ineffi- cient. A burst-tolerance index between 1 and 10 may optionally be specified (exponential filter weight). The no form of this command reverts the queue to default “tail-drop” behavior.

Mode: Source

Command	Purpose
node(src)[name]#random-detect {burst-tolerance}	Defines random early detection (RED) for
	queues of for the selected traffic-class or policy
	name. The range for the optional value burst-
	tolerance is from 1 to 10.

Discarding Excess Load

The command police controls traffic arriving in a queue for class name. The value of the first argument aver- age-kilobitsdefines the average permitted rate in kbps, the value of the second argument kilobits-aheaddefines the tolerated burst size in kbps ahead of schedule. Excess packets are dropped.

This procedure describes defining discard excess load

Mode: Source

Command	Purpose
node(src)[name]#police average-kilobits	Defines how traffic arriving in a queue for the selected
burst-sizekilobits-ahead	class or policy name has to be controlled. The value aver-
	age-kilobitsfor average rate permitted is in the range
	from 0 to 10000 kbps. The value kilobits-aheadfor burst
	size tolerated ahead of schedule is in the range from 0 to
	10000.

Quality of Service for routed RTP streams

SmartWare supports including routed RTP packets in the QoS process. This is possible for plain streams as well as for encrypted streams in up- and downlink direction. The identification of the packets that have to be included in the QoS process base upon their size. In the service-policy profile exists a command that allows mapping of a specific packet size or a range to a traffic class.

There are two predefined ranges the user can choose. One of them is ‘routed-voice’ that specifies a packet size range from 50 Byte to 280 Byte the other one is ‘routed-voice-encrypted’ that specifies a packet size range from 92 Byte to 324 Byte. By selecting this predefined ranges all voice packets from G.729/10ms to G.711/30ms will be assigned to the configured traffic-class.

Be aware that also other packets matching the configured size or range will be assigned to the specified traffic- class. All values to be configured are in Byte and are IP Packet sizes (IP Header plus Payload).

Link scheduler configuration task list 165