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Руководство пользователя. Версия 2.0 Страница: 241

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [241/741] 172936

ConfiguringSpanningTreeProtocol

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

November2011 Page241

D‐LinkUWSUserManual

BridgeMaxAge(secs) Specifiestheswitchmaximumagetime,whichindicatestheamountoftime

insecondsa bridgewaitsbeforeimplementingatopologicalchange.Thevalid

rangeis6‐40,andthevaluemustbelessthanorequalto(2*BridgeForward

Delay)–1andgreaterthanorequalto2*(B

ridgeHelloTime+1).Thedefault

valueis20.

BridgeHelloTime(secs) SpecifiestheswitchHellotime,whichindicatestheamountoftimeinseconds

arootbridgewaitsbetweenconfigurationmessages.Thevalidrangeis1‐10,

andthedefaultvalueis2.Thev

aluemustbelessthanorequalto(BridgeMax

Age/2)–1.Thedefaulthellotimevalueis2.

BridgeForwardDelay(secs) Specifiestheswitchforwarddelaytime,whichindicatestheamountoftimein

secondsabridgeremainsinalisteningandlearningstatebeforeforwarding

packets.Thev

aluemustbegreaterorequalto(BridgeMaxAge/2)+1.The

timerangeisfrom4secondsto30seconds.Thedefaultvalueis15.

SpanningTreeMaximum

Hops

Specifiesthemaximumnumberofbridgehopstheinformationforaparticular

CSTinstancecantravelbeforebeingdi

scarded.

BPDUGuard EnableordisabletheBPDUGuard.Theswitchesbehindtheedgeportsthat

haveBPDUguardenabledwillnotbeabletoinfluencetheoverallSTP

topology.UsingtheBPDUGuardfeaturecanhelpenforcetheSTPdomain

bordersandkeeptheactivetopologybeconsistentandpredictable.

BPUDFilter Enableordisabl

etheBPDUFilter.WhenBPDUfilteringisenabled,theport

dropstheBPDUsreceived.

SpanningTreeTxHoldCount ConfigurethemaximumnumberofBPDUsthebridgeisallowedtosendwithin

thehellotimewindow.Thedefaultvalueis6.

BridgeIdentifier ThebridgeidentifierfortheCST.Itisma

deupusingthebridgepriorityandthe

baseMACaddressofthebridge.

TimeSinceTopologyChange Displaysthetotalamountoftimesincethelasttopographicchange.Thetime

isdisplayedinhour/minute/secondformat,forexample,5hours10minutes

and4seconds.

TopologyChangesCounts DisplaysthetotalamountofST

Pstatechangesthathaveoccurred.

TopologyChange Indicateswhetheratopologychangeisinprogressonanyportassignedtothe

CST.ThepossiblevaluesareTrueorFalse.

DesignatedRoot Displaysthebridgeidentifieroftherootbridge,whichismadeupfromthe

bridgepriorityandthebaseMACad

dressofthebridge.

RootPathCost Displaysthecostofthepathfromthisbridgetothedesignatedroot.

RootPort Indicatestherootportoftheselectedinstance.

MaxAge ShowsthepathCosttotheDesignatedRootfortheCST.

ForwardDelay ShowsthederivedvalueoftheRootPortBridgeFo

rwardDelayparameter.

HoldTime IndicatestheminimumtimebetweentransmissionofConfigurationBPDUs.

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.

Table132:SpanningTreeCSTConfiguration/StatusFields(Cont.)

Field Description

D-Link DWS-4026 Руководство пользователя. Версия 2.0 онлайн [241/741] 172936

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