H3C S5820X Series Configuration Manual

Also see for s5800 series: Installation manual Instruction manual Command reference Quick start Troubleshooting guide

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H3C S5820X Series Configuration Manual Manual pdf 80 page image

11-2By using the two modes appropriately, you can improve bandwidth usage.Suppose there are two flows: a low priority data flow and a high priority, bursty video flow. Their totaltraffic rate cannot exceed 4096 kbps and the video flow must be guaranteed of at least 2048 kbpsbandwidth. To this end, you can configure common CAR actions to set the traffic rate to 2048 kbps forthe two flows, configure a hierarchical CAR action to limit their total traffic rate to 4096 kbps, andreference the action in AND mode in the common CAR action for the data flow, and in OR mode in thecommon CAR action for the video flow. Thus, the video flow is assured of 2048 kbps bandwidth, andcan use the idle bandwidth of the data flow.In a bandwidth oversubscription scenario, where, for example, the bandwidth of an uplink port is lowerthan the total traffic rate of its downlink ports, you can use hierarchical CAR to limit the total rate of thetraffic from the downlink ports while allowing each downlink port to forward traffic at the maximum ratewhen the other ports are idle. For example, use common CAR actions to limit the rate of Internetaccess flow 1 and flow 2 to 128 kbps each, and use a hierarchical CAR action to limit their total trafficrate to 192 kbps. Then reference the hierarchical CAR action for both flow 1 and flow 2 in AND mode.Thus, when flow 1 is not present, flow 2 is transmitted at the maximum rate, 128 kbps. When bothflows are present, the traffic rate of flow 2 may drop below this rate, because the total rate of the twoflows cannot exceed 192 kbps.Configuring Global CARReferencing an Aggregation CAR in a Traffic BehaviorConfiguration prerequisitesz You have determined the parameters in the aggregation CAR.z You have determined the traffic behavior to reference the aggregation CAR.Configuration procedureFollow these steps to reference an aggregation CAR in a traffic behavior:To do… Use the command… RemarksEnter system view system-view —Configure an aggregationCAR actionqos car car-name aggregative circommitted-information-rate [ cbscommitted-burst-size [ ebsexcess-burst-size ] ] [ pirpeek-information-rate ] [ green action ][ yellow action ] [ red action ]RequiredBy default:z CBS is 512 bytesz EBS is 512 bytesz The default action for greenpackets is passz The default action for yellowpackets is passz The default action for redpackets is discardEnter traffic behavior view traffic behavior behavior-name RequiredReference the aggregationCAR in the traffic behavior car name car-name Required