Zte ZXR10 5250-52TC - Page 176

ZXR105250SeriesCongurationGuide
3.TheMIBofthelocaldevicestoresthenetworkmanagementinformationofall
neighbordevices,andanetworkmanagementprogramcanquerylayer-2connection
informationintheMIB.
TheLLDPisnotacongurationprotocoloftheremotesystemorasignalingcontrol
protocolusedbetweentwoports.TheLLDPdiscoverslayer-2protocolconguration
conictsbetweenneighbordevices,butitonlyreportstheproblemtoanupper-layer
networkmanagementdevice,withoutprovidinganymechanismtosolvetheproblem.
TheLLDPissimplyaneighbordiscoveryprotocolthatdenesastandardfornetwork
devices(suchasswitches,routers,andWLANaccesspoints)intheEthernettoadvertise
theiridentitiestoothernodesinthenetworkandstorediscoveryinformationofallneighbor
devices.Forexample,devicecongurationanddeviceIDscanbeadvertisedbytheLLDP .
TheLLDPdenesauniversaladvertisementinformationset,aprotocolforsending
theadvertisementinformation,andamethodforstoringthereceivedadvertisement
information.Thedevicethatwantstoadvertiseitsinformationcanplacemultiplepieces
ofadvertisementinformationintoaLinkLayerDiscoveryProtocolDataUnit(LLDPDU).
TheLLDPDUcontainsavariable-lengthmessageunit(calledTLVs),whicharedescribed
below:
lType:indicatesthetypeofthemessagetobesent.
lLength:indicatesthenumberofbytesinthemessage.
lValue:indicatesthecontentstobesent.
EachLLDPDUcontainsfourmandatoryTLVsandoneoptionalTLV:
lChassisIDTLVandPortIDTLV:identifythesender.
lTLLTLV:notiesthereceiverofthestorageperiodofamessage.Ifthereceiverdoes
notreceiveanyupdatemessagewithinthespeciedperiod,thereceiverdiscardsall
therelatedmessages.ArecommendedupdatefrequencyisdenedbytheIEEE,that
is,tosendmessagesat30-secondintervals.
lOptionalTLVs:includesabasicmanagementTLVset(suchasportdescriptionTLV),
aspecialTLVsetdenedbyIEEE802.1,aspecialTLVsetdenedbyIEEE802.3,
andanLLDP-MEDTLVsetdenedbyTIA.
lEndofLLDPDUTLV:indicatestheendofanLLDPDU.
ConguringLLDP
TheLLDPcongurationincludesthefollowingcommands:
CommandFunction
zte(cfg)#lldphellotime<5-32768>SetstheintervalforsendingLLDP
neighbordiscoverymessages.
zte(cfg)#lldpholdtime<2-10>SetstheLLDPneighborholding
time.
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SJ-20131111172707-002|2013-11-27(R1.0)ZTEProprietaryandCondential