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268 CN4093 Application Guide for N/OS 8.4

vNIC Bandwidth Metering

EnterpriseNOS8.4supportsbandwidthmeteringforvNICtraffic.Bydefault,each

ofthefourvNICsonanygivenportisallowedanequalshare(25%)ofNIC

capacitywhenenabled.However,youmayconfigurethepercentageofavailable

switchportbandwidthpermittedtoeachvNIC.

vNICbandwidthcanbeconfigured

asavaluefrom1to100,witheachunit

representing1%(or100Mbps)ofthe10Gbpslink.Bydefault,eachvNICsenabled

onaportisassigned25units(equalto25%ofthelink,or2.5Gbps).Whentraffic

fromtheswitchtothevNICreachesitsassignedbandwidthlimit,

theswitchwill

droppacketsegressingtotheaffectedvNIC.

Note: Bandwidthmeteringdropsexcesspacketswhenconfiguredlimitsare

reached.ConsiderusingtheETSfeatureinapplicationswherepacketlossisnot

desirable(see“EnhancedTransmissionSelection”onpage 352).

Tochangethebandwidthallocation,usethefollowingcommands:

Note: vNICsthat

aredisabledareautomaticallyallocatedabandwidthvalueof0.

Acombinedmaximumof100unitscanbeallocatedamongvNICpipesenabledfor

anyspecificport(bandwidthvaluesfordisabledpipesarenotcounted).Ifmore

than100unitsareassignedtoenab ledpipes,anerrorwillbereportedwhen



attemptingtoapplytheconfiguration.

Thebandwidthmeteringconfigurationisaut o matically synchronizedbetweenthe

switchandvNICsforregularEthernetandiSCSItraffic.Onceconfiguredonthe

switch,thereisnoneedto manuallyconfigurevNICbandwidthmeteringlimitson

theNIC.

Note: FCoEvNICdoesnotuseegressmetering.ETSand

PFCmustbeenabledto

ensurelosslesstransmissionforFCoEtraffic.ETSdoestrafficshaping.Youcan

configureaminimumbandwidthforeachtrafficclass.Forexample,40%forFCoE

priority3,60%fortheEthernettraffic.FCoEtrafficgets40%minimumguaranteed

bandwidth.IftheEthernettrafficonlyconsumes

30%bandwidth,thenFCoEtraffic

canuse70%.IfthereisnootherEthernettraffic,thenFCoEtrafficcanuse100%.

TheFCoEvNICcanuseupto100%ofthebandwidth,withaminimumgu aranteed

bandwidthof40%.

CN 4093(config)# vnic port <portaliasornumber> index <vNICnumber(1‐4)>

CN 4093(vnic-config)# bandwidth <allocatedpercentage>

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