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DWS-4026
Руководство пользователя. Версия 2.0 Страница: 246

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [246/741] 172936

ConfiguringSpanningTreeProtocol

D-Link UnifiedWiredandWirelessAccessSystem

November2011 Page246

D‐LinkUWSUserManual

PortForwardingState IndicatesthecurrentSTPstateofaport.Ifenabled,theportstatedetermines

whatforwardingactionistakenontraffic.Possibleportstatesare:

• Disabled:STPiscurrentlydisabledontheport.Theportforwardstraffic

whilelearningMACaddresses.

• Blocking:Theportiscurrentlyblockedandcannotbeuse

dtoforward

trafficorlearnMACaddresses.

• Listening:Theportiscurrentlyinthelisteningmode.Theportcannot

forwardtrafficnorcanitlearnMACaddresses.

• Learning:Theportiscurrentlyinthelearningmode.Theportcannot

forwardtraffic,however,itcanlearnnewMACaddresses.

• Fo

rwarding:Theportiscurrentlyintheforwardingmode.Theportcan

forwardtrafficandlearnnewMACaddresses.

PortRole EachMSTBridgePortthatisenabledisassignedaPortRoleforeachspanning

tree.Theportrolewillbeoneofthefollowingvalues:RootPort,Designated

Port,AlternatePo

rt,BackupPort,MasterPortorDisabledPort.

DesignatedRoot RootBridgefortheCST.Itismadeupusingthebridgepriorityandthebase

MACaddressofthebridge.

DesignatedCost DisplayscostoftheportparticipatingintheSTPtopology.Portswithalower

costarelesslikelytobeblo

ckedifSTPdetectsloops.

DesignatedBridge BridgeIdentifierofthebridgewiththeDesignatedPort.Itismadeupusingthe

bridgepriorityandthebaseMACaddressofthebridge.

DesignatedPort PortIdentifierontheDesignatedBridgethatoffersthelowestcosttotheLAN.

Itismadeupfr

omtheportpriorityandtheinterfacenumberoftheport.

TopologyChange

Acknowledge

IdentifieswhetherthenextBPDUtobetransmittedforthisportwouldhave

thetopologychangeacknowledgementflagset.Itiseither"True"or"False".

AutoEdge Configuringtheautoedgemodeofaportallowstheporttobec

omeanedge

portifitdoesnotseeBPDUsforsomeduration.ThepossiblevaluesareEnable

orDisable.

EdgePort Indicateswhethertheportisenabledasanedgeport.

Point‐to‐pointMAC Derivedvalueofthepoint‐to‐pointstatus.

RootGuard Configuringtherootguardmodesetsaporttodisc

ardanysuperior

informationreceivedbytheportandthusprotectagainstrootofthedevice

fromchanging.Theportgetsputintodiscardingstateanddoesnotforward

anypackets.ThepossiblevaluesareEnableorDisable.

LoopGuard Configuringtheloopguardmodepreventsaportfromerr

oneously

transitioningfromblockingstatetoforwardingwhentheportstopsreceiving

BPDUs.Theportismarkedasbeinginloop‐inconsistentstate.Inthisstate,the

portdoesnotforwardpackets.ThepossiblevaluesareEnableorDisable.

TCNGuard ConfiguringtheTCNguardforaportrestrictstheportfrompr

opagatingany

topologychangeinformationreceivedthroughthatport.Thepossiblevalues

areEnableorDisable.

CSTRegionalRoot ShowsthepriorityandbaseMACaddressoftheCSTRegionalRoot.

CSTPathCost ShowsthepathCosttotheCSTtreeRegionalRoot.

LoopInconsistentState Identifieswhethertheportiscurrentlyinaloopin

consistentstate.Iftheport

isinaloopinconsistentstate,itdoesnotforwardpackets.

Table134:SpanningTreeCSTPortConfiguration/StatusFields(Cont.)

Field Description

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [246/741] 172936

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