Enterasys Networks XSR CLI manual priority

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Traffic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.