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Policy-Map Commands

12-90 Configuring Quality of Service

Example

Thefollowingexampledefinesatrafficclassusingtheclass-map commandandmatchcriteria

fromthetrafficclasswiththeTr affic Policingconfiguration,whichisconfiguredintheservice

policyusingthe

policy-map command.Theservice-policycommandisthenusedtoattach

thisservicepolicytotheinterface.

Inthisexample,trafficpolicingisconfiguredwiththeaveragerateof8000bitspersecondandthe

normalburstsizeat1200bytesandanexcessburstof2000bytesforallpacketsleavingF1/0:

XSR(config)#class-map access-match

XSR(config-cmap<access-match>)#match access-group 1

XSR(config)#policy-map police-setting

XSR(config-pmap<police-setting>)#class access-match

XSR(config-pmap-c<access-match>)#police 8000 1200 2000 conform-action transmit

exceed-action drop

XSR(config>)interface fastethernet 1/0

XSR(config-if<F1>)#service-policy output police-setting

priority

Thiscommandgivesprioritytoaclassoftrafficbelongingtoapolicymap.Itconfigureslow

latencyqueueing,providingstrictPriorityQueues(PQ)overClass‐basedWeightedFairQueueing

(CBWFQ).StrictPQallowsdelay‐sensitivedatasuchasvoicetobede‐queuedandsentbefore

packetsinotherqueues

aredequeued.

Theburstargumentspecifiestheburstsizeand,assuch,configuresthenetworktoaccommodate

temporaryburstsoftraffic.Thedefaultburstvalue,whichiscomputedas1secondoftrafficatthe

configuredbandwidthrate,isusedwhentheburstargumentisnotspecified.

Priorityqueuescanbe

reservedbyabsolutebandwidthwiththesesettings:high,medium,lowand

normal.

Syntax

priority priority-level bandwidth-kbps [burst]

Syntax of the “no” Form

Removeapreviouslyspecifiedpriorityspecifiedforaclasswiththenoformofthiscommand:

no priority

Note: The bandwidth and priority commands cannot be used in the same class, within the

same policy map, but they can be used together in the same policy map. They cannot be configured

for class-default. Class-default is always defined as fair queue.

priority level

Specifiesthepriorityqueue:high,medium,lowornormal.Normal

priorityhastheleastprecedence.

bandwidth-kbps

Guaranteedallowedbandwidthforprioritytraffic.Beyondthe

guaranteedbandwidth,prioritytrafficwillbedroppedtoensurethat

non‐prioritytrafficisnotstarved.Range:1to100,000kbps.

burst

Setstheburstsize,rangingfrom32to2,000,000bytes.

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