D-Link DWS-4026 [254/741] Managing lldp

ManagingLLDP

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

November2011 Page254

D‐LinkUWSUserManual

ManagingLLDP

TheIEEE802.1ABdefinedstandard,LinkLayerDiscoveryProtocol(LLDP),allowsstationsresidingonan802

LANtoadvertisemajorcapabilitiesandphysicaldescriptions.Thisinformationisviewedbyanetworkmanager

toidentifysystemtopologyanddetectbadconfigurationsontheLAN.

LLDPisaone‐wayprotocol;therearenor

equest/responsesequences.Informationisadvertisedbystations

implementingthetransmitfunction,andisreceivedandprocessedbystationsimplementingthereceive

function.Thetransmitandreceivefunctionscanbeenabled/disabledseparatelyperport.Bydefault,both

transmitandreceivearedisabledonallports.Theapplicationisresponsibleforstartingea

chtransmitand

receivestatemachineappropriately,basedontheconfiguredstatusandoperationalstateoftheport.

D‐LinkDWS‐4000SeriesallowsLLDPtohavemultipleLLDPneighborsperinterface.Thenumberofsuch

neighborsislimitedbythememoryconstraints.Aproduct‐specificconstantdefinesthemaximumnumberof

neighbor

ssupportedbytheswitch.ThereisnorestrictiononthenumberofneighborssupportedonaperLLDP

port.Ifalltheremoteentriesontheswitcharefilledup,thenthenewneighborsareignored.Incaseof

multipleVOIPdevicesonasingleinterface,the802.1abcomponentsendstheV

oiceVLANconfigurationtoall

theVoIPdevices.