Zte ZXR10 2900E Series - STP Configuration

ZXR102900ESeriesCongurationGuide
1preview225.1.1.10:0:0:16
5.10STPConguration
STPOverview
TheSpanningTreeProtocol(STP)isapplicabletothenetworkwithdataloops.Ituses
certainalgorithmstoblocksomeredundantlinks,thuspreventingpossiblenetworkloops.
TheRapidSpanningTreeProtocol(RSTP)isdevelopedonthebasisofcommonSTP ,
andprovidesafasterspanningtreeconvergencebyusingamechanisminwhichtheport
statecanberapidlychangedfromBlockingtoForwarding.
TheMultipleSpanningTreeProtocol(MSTP)isdevelopedonthebasisofRSTPandSTP .It
introducesdomainsandinstances,andrecognizesVLANID.Thewholenetworktopology
structurecanbeplannedintoaCommonandInternalSpanningTree(CIST),whichis
dividedintoCommonSpanningTree(CST)andInternalSpanningTree(IST).
ManydevicesenablingMSTPconstructMultipleSpanningTree(MST)areasinthe
switchingnetwork.Whenthedevicessatisfythefollowingconditions,theycanbe
consideredtoexistinanMSTarea.AswitchingnetworkcancovermanyMSTareas.
UserscandividetheswitchesintoanMSTareabyusingMSTPcommands.
lSameareaname.
lSamereversionlevel.
lSamemappingrelationshipbetweenaVLANandaninstance.
lSwitchesshouldbeconnecteddirectly.
MultiplespanningtreescanbeconguredineachMSTParea,andtheyareindependent
fromeachother.EachspanningtreeisanInternalSpanningTree(IST),anditcanbe
calledasMultipleSpanningTreeInstance(MSTI).CommonSpanningTreeconnectsall
MSTareasintheswitchingnetwork.AnMSTareacanbeconsideredasaswitch,aCST
isaspanningtreewhichisgeneratedbySTPandRSTPprotocolcalculation.AllIST s
andCST sarecalledasCommonandInternalSpanningTree(CIST).ACISTisasingle
spanningtreeusedtoconnectallswitches.
InthisMSTPtopologystructure,anISTcanserveasasinglebridge(switch).Inthis
way,aCTScanserveasanRSTPfortheinteractionofcongurationinformation(BPDU).
MultipleinstancescanbecreatedinanISTareaandtheseinstancesarevalidonlyinthis
area.AninstanceisequivalenttoanRSTP ,exceptthattheinstanceneedstoperform
BPDUinteractionwithbridgesoutsidethisarea.
FortheMSTPtopologicalstructure,seeFigure5-8.
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SJ-20130731155059-002|2013-11-27(R1.0)ZTEProprietaryandCondential