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Queuing and Scheduling

TheCN4093canbeconfiguredtohaveeither2or8outputClassofService(COS)

queuesperport,intowhicheachpacketisplaced.Eachpacket’s802.1ppriority

determinesitsCOSqueue,exceptwhenanACLactionsetstheCOSqueueofthe

packet.

Youcanconfigurethefollowingattributes

forCOSqueues:

 Map802.1ppriorityvaluetoaCOSqueue

 DefinetheschedulingweightofeachCOSqueue

Youcanmap802.1ppriorityvaluetoaCOSqueue,asfollows:

Tosetthe COSqueueschedulingweight,usethefollowingcommand.

Theschedulingweightcanbesetfrom0to15.Weightvaluesfrom1to15setthe

queuetouse

weightedround‐robin(WRR)scheduling,whichdistributeslarger

numbersofpacketstoqueueswiththehighestweightvalues.Fordistribution

purposes,eachpacketiscountedthe same,regardlessofthepacket’ssize.

Aschedulingweightof0(zero)indicatesstrictpriority.Trafficinstrictpriority

queuehasprecedenceoverother

allqueues.Ifmorethanonequeueisassigneda

weightof0,thestrictqueuewithhighestqueuenumberwillbeservedfirst.Once

alltrafficinstrictqueuesisdelivered,anyremainingbandwidthwillbeallocated

totheWRRqueues,dividedaccordingtotheirweightvalues.

Note: Usecautionwhen

assigningstrictschedulingtoqueues.Heavytrafficin

queuesassignedwithaweightof0canstarvelowerpriorityqueues.

Foraschedulingmethodthatusesaweighteddeficitround‐robin(WDRR)

algorithm,distributingpacketswithanawarenessofpacketsize,see“Enhanced

TransmissionSelection”onpage 352.

CN 4093(config)# qos transmit-queue mapping <priorityvalue(0‐7)> <COS queue(0‐7)>

CN 4093(config)# qos transmit-queue weight-cos <COSqnumber><COSq weight (0‐15)>

Lenovo Flex System Fabric CN4093 User Manual

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