Enterasys X-Pedition XSR CLI Specifikace stáhnout pdf (Strana 482)

Policy-Map Commands

12-86 Configuring Quality of Service

Example

Thesecommandscreateclass‐mapclass1anddefineitsmatchcriteria:

XSR(config)#class-map class1

XSR(config-cmap<class1>)#match access-group 136

Thesecommandscreatethepolicymapwhichisdefinedtocontainpolicyspecificationsforclass1

andthedefaultclass:

XSR(config)#policy-map policy1

XSR(config-pmap<policy1>)#class class1

XSR(config-pmap-c<class1>)#bandwidth 2000

XSR(config-pmap-c<class1>)#queue-limit 40

XSR(config-pmap<policy1>)#class class-default

XSR(config-pmap-c<class-default>)#queue-limit 20

bandwidth

Thiscommandspecifiesormodifythebandwidthallocatedforaclassbelongingtoapolicymap.

Itisusedinconjunctionwithaclassdefinedbythe

class-mapcommand.Thebandwidth

commandspecifiesthebandwidthfortrafficinthatclass.Class‐BasedWeightedFairQueueing

(CBWFQ)derivestheweightforpacketsbelongingtotheclassfromthebandwidthallocatedto

theclass.CBWFQthenusestheweighttoensurethatthequeuefortheclassisservicedfairly.

Theamountofbandwidth

canbespecifiedinpercentagesorkilobitspersecond(kbps).When

configuredinkbps,theclassweightiscalculatedasaratioofthebandwidthspecifiedforthatclass

overtheavailablelinkbandwidth.Theavailab lelinkbandwidthisequaltotheinterface

bandwidthminusthesumofallbandwidth

reservedforlowlatencyqueues.Whenconfiguredin

percentages,theclassweightisequaltothebandwidthpercentages.

Configuringbandwidthinpercentagesismostusefulwhentheunderlyinglinkbandwidthis

unknown,changesovertime,ortherelativeclassbandwidthdistributionsareknown.For

interfacesthathaveadaptiveshapingrates,

CBWFQcanbesetbyconfiguringclassbandwidthsin

percentages.

Thefollowingrestrictionsapplytothe

bandwidthcommand:

•Ifthe

percentkeywordisused,thesumofclassbandwidthpercentagescannotexceed100%.

•TheamountofbandwidthsetshouldbelargeenoughtoalsoaccommodateLayer 2overhead.

•Apolicymapcanhavealltheclassbandwidthsspecifiedinkbpsoralltheclassbandwidths

specifiedinpercentages,butnota

mixofboth.But,theunitfortheprioritycommandinthe

priorityclasscanbedifferentfromthebandwidthunitoftheCBWFQ.

Syntax

bandwidth {bandwidth-kbps | percent percent}

Note: When the bandwidth of an interface is insufficient to satisfy the bandwidth of a policy map, the

interface becomes oversubscribed and some CBFWQ classes may become unable to transmit.

bandwidth-kbps

Amountofbandwidth,inkbps,assignedtotheclass.

percent

Availablebandwidthpercentageassignedtotheclass.

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