Enterasys D-Series Specifications download pdf (Page 109)

Configuring Link Layer Discovery Protocol and LLDP-MED

Enterasys D-Series CLI Reference 5-13

Examples

ThisexampleshowshowtoclearalltheCiscoDPparametersbacktothedefaultsettings.

D2(rw)->clear ciscodp

ThisexampleshowshowtocleartheCiscoDPstatusonportfe.1.5.

D2(rw)->clear ciscodp port status fe.1.5

Configuring Link Layer Discovery Protocol and LLDP-MED

Overview

TheLinkLayerDiscoveryProtocol(LLPD)issimilartotheEnterasysDiscoveryProtocolandthe

CiscoDiscoveryProtocolinthatitprovidesanindustrystandard,vendor‐neutralwaytoallow

networkdevicestoadvertisetheiridentitiesandcapabilitiesonalocalareanetwork,andto

discoverthatinformationabouttheirneighbors.

LLDP‐MEDisanenhancementtoLLDPthatprovidesthefollowingbenefits:

•Extendedanda utoma tedpowermanagementofPoweroverEthernetendpoints

•Inventorymanagement,allowingnetworkadministratorstotracktheirnetworkdevicesand

todeterminetheircharacteristics,suchasmanufacturer,softwareandhardwareversions,and

serialorassetnumbers

Theinformationsent

byanLLDP‐enableddeviceisextractedandtabulatedbyitspeers.The

communicationcanbedonewheninformationchangesoronaperiodicbasis.Theinformation

tabulatedisagedtoensurethatitiskeptuptodate.Portscanbeconfiguredtosendthis

information,receivethisinformation,or

bothsendandreceive.

EitherLLDPorLLDP‐MED,butnotboth,canbeusedonaninterfacebetweentwodevices.A

switchportusesLLDP‐MEDwhenitdetectsthatanLLDP‐MED‐capabledeviceisconnectedtoit.

LLDPinformationiscontainedwithinaLinkLayerDiscoveryProtocolData

Unit(LLDPDU)sent

inasingle8 02.3Ethernetframe.TheinformationfieldsinLLDPDUareasequenceofshort,

variable‐length,informationelementsknownasTLVs—type,length,andvaluefieldswhere:

•Typeidentifieswhatkindofinformationisbeingsent

•Lengthindicates thelengthoftheinformation stringinoctets

•Valueistheactualinformationthatneedstobesent

TheLLDPstandardspecifiesthatcertainTLVs aremandatoryintransmittedLLDPDUs,while

othersareoptional.Youcanconfigureonaport‐specificbasiswhichoptionalLLDPandLLDP‐

MEDTLVsshouldbesentinLLDPDUs.

Purpose

ToreviewandconfigureLLPDandLLPD‐MED.

Commands

ThecommandsusedtoreviewandconfiguretheCDPdiscoveryprotocolarelistedbelow.

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Enterasys D-Series Specifications Page 109