Zte ZXR10 5900E Series - STP Maintenance and Diagnosis

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ZXR105900ESeriesUserManual(EthernetSwitchingVolume)

FIGURE12NEWROOTBRIDGE

InFigure12,switchDtakespartincalculatingspanningtree.If

priorityofswitchDislowerthanthatofswitchA.SwitchDis

electedtobeanewrootswitch.Aftercalculatingspanningtree,

portofswitchBwhichconnectstoswitchAisblocked.

Portrootprotectioncommandisconguredininterfacemode.It

isonlypermittedindesignatedportandisnotpermittedinroot

port.AportwhichenablesrootprotectionreceivesBPDUpackets

fromaneighborswitchandknowstheneighborswitchhassmaller

priority.PortwillenterROOT_INCONSISTENTstate.

InFigure12,portofswitchCthatisconnectedtoswitchDshould

beconguredasprotection.OncethisportreceivesaBPDUpacket

whichcontainssmallerprioritythanrootswitch,thisportwillen-

terROOT_INCONSISTENTstateandstopstransmittinganydata

packet.OnceswitchDstopssendingtheBPDUpacketwhichcon-

tainssmallerpriority.PortofswitchCwillresumetransmitting

datapacketsautomatically.

44CondentialandProprietaryInformationofZTECORPORATION

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