User manual

 16‐PortGigabitEthernetPoE+Web‐ManagedSwitchwith2SFPPorts
55
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Item Description
inst SelecttheinstanceID. 
port‐fast ThetimeSpanningTreeProtocol(STP)takestotransitionportsovertotheforwarding
statecancauseproblems.Port‐fastisafunctiontoresolvethisproblem.Port‐fastsolves
theproblemofdelayswhenclientcomputersareconnectingtoswitches.Withport‐fast
enabledonaport,youeffectivelypreventtheimplementationofSTPonthatport.
auto‐edge Bydefault,“auto‐edge”isenabledonallports.ThiswilllookforBPDUsfor3secondsand,
ifnonearefound,willbeginforwardingpackets,andtheportissetas“edge.”Ifthereare
BPDUs,theportissetas“non‐edge.”
bdpu‐guard BPDUguarddisablestheportuponBPDUreceptionifport‐fastisenabledontheport.This
effectivelydeniesdevicesconnectedtotheseportsfromparticipatinginthedesignedSTP,
thusprotectingyourdata‐centercore.
bdpu‐filter EnablingBPDUfilteringforaportstopssendingorreceivingBPDUonthisinterface;thisis
thesameasdisablingspanningtreeontheinterface.Itisariskychoice,unlessyouaresure
thatnoswitchcaneverbeconnectedtothisport.
tc‐guard Incertainsituationsitcanbedesirabletopreventtopologychangesoriginatingator
receivedatagivenportfrombeingpropagatedtotherestofthenetwork.Thismaybethe
casewhenthenetworkisnotunderasingleadministrativecontrolanditisbeneficialto
preventdevicesexternaltothecoreofthenetworkfromcausingMAC‐addressflushingin
thecore.ThisbehaviorcanbeenabledbyconfiguringTopologyChangeGuard(TCGuard)
ontheport.
priority Ifaloopoccursinthenetwork,MSTPusestheportpriorityparameterwhenselectingan
interfacetoputintotheforwardingstate.Assignhigherpriorityvalues(lowernumbers)to
interfacesthatyouwantselectedfirstandlowerpriorityvalues(highernumbers)thatyou
wantselectedlast.Ifallinterfaceshavethesamepriorityvalue,MSTPputstheportwith
thelowestinterfacenumberintheforwardingstateandblockstheotherports.
path‐cost TheMSTPpathcostdefaultvalueisderivedfromthemediaspeedofaninterface.Ifaloop
occurs,MSTPusescostwhenselectinganinterfacetoputintheforwardingstate.Assign
lowercostvaluestointerfacesthatyouwantselectedfirstandhighercostvaluesthatyou
wantselectedlast.Ifallinterfaceshavethesamecostvalue,MSTPputstheinterfacewith
thelowestinterfacenumberintheforwardingstateandblockstheotherinterfaces.
point‐to‐point AdminPoint‐to‐PointLink‐‐SpecifywhetherthisportisconnectedtoasharedLANsegment
(value“off”)orapoint‐to‐pointLANsegment(value“on”).Apoint‐to‐pointLANsegmentis
connectedtoexactlyoneotherbridge(normallywithadirectcablebetweenthem).Only
point‐to‐pointlinksandedgeportscanrapidlytransitiontoforwardingstate. 
Ifyousetthisvalueto“auto,”theswitchautomaticallydetectswhethertheportis
connectedtoasharedlinkorapoint‐to‐pointlink.
Rootguard Root‐guardensuresthatanunintendedswitchdoesnotbecomeanewrootbridge.Root
guardallowsthedevicetoparticipateinSTPaslongasthedevicedoesnottrytobecome
theroot.Ifrootguardblockstheport,subsequentrecoveryisautomatic.Recoveryoccurs
assoonastheoffendingdeviceceasestosendsuperiorBPDUs.
tc‐ignore Ignoretechnologychange(TC)onoroff.
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