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Enterasys Networks XSR CLI Router User Manual

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Frame Relay Map Class Commands

9-98 Configuring Frame Relay

Example

ThisexampleaddsmapclassslowlinkwithBeof10000andBcof6000bits:

XSR(config)#map-class frame-relay slowlink

XSR(config-map-class<slowlink>)#frame-relay be out 10000

XSR(config-map-class<slowlink>)#frame-relay bc out 6000

frame-relay cir

ThiscommandspecifiestheoutgoingCommittedInformationRate(CIR)foraFrameRelaymap‐

class.CIR,BcandBevaluesspecifyhowtheXSRforwardspacketsundernormalandcongested

conditionsusingthefollowingequation:

Tc=Bc/CIR=7,000bits/56,000bps=125mS(BcandCIRvalues

aredefault)

FrameRelaynetworksarecommittedtodeliverBcbitsofdataeveryTc,somaximumcommitted

throughputequals7,000/125mS=56kbps=CIR.Inthissense,CommittedBurst(Bc)isnotreallya

burstbuta“smoothing”functionforthenumberofbitsthattheXSRisallowedto

transmitduring

theTcperiodinordertoachievethespecifiedCIR.

SincethemaximumnumberofbitsthatcanbesentduringTcisBcplusBebits,usingthedefault

values,maximumthroughputequals(Bc+Be)/Tc=(7,000+7,000)/125mS=112kbps=2*56kbps=

2

*CIR.

Syntax

frame-relay cir out rate

Syntax of the “no” Form

ThenocommandresetstheCIRtoitsdefaultvalue:

no frame-relay cir out

Mode

MapClassconfiguration:XSR(config-map-class)#

Defaults

•CIRenforcedforoutgoingtrafficonly

•CIR:56000bps

•Be:7000bits

•Bc:7000bits

Example

Thisexamplecreatesthemapclassslowlinkwithcirsetat9600bps:

XSR(config)#map-class frame-relay slowlink

XSR(config-map-class<slowlink>)#frame-relay cir out 9600

out

Setsthetrafficdirection‐outputratelimitingonly.

rate

CIR,rangingfrom1000to1,000,000bitspersecond.

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