Enterasys Enterasys SecureStack B2 B2G124-24 Spezifikationen Seite 131

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Configuring Link Layer Discovery Protocol and LLDP-MED
SecureStack B2 Configuration Guide 6-13
Examples
ThisexampleshowshowtoclearalltheCiscoDPparametersbacktothedefaultsettings.
B2(rw)->clear ciscodp
ThisexampleshowshowtocleartheCiscoDPstatusonportfe.1.5.
B2(rw)->clear ciscodp port status fe.1.5
Configuring Link Layer Discovery Protocol and LLDP-MED
Overview
TheLinkLayerDiscoveryProtocol(LLPD)providesanindustrystandard,vendorneutralwayto
allownetworkdevicestoadvertisetheiridentitiesandcapabilitiesonalocalareanetwork,andto
discoverthatinformationabouttheirneighbors.
LLDPMEDisanenhancementtoLLDPthatprovidesthefollowingbenefits:
•Extendedanda utoma tedpower
managementofPoweroverEthernetendpoints
•Inventorymanagement,allowingnetworkadministratorstotracktheirnetworkdevicesand
todeterminetheircharacteristics,suchasmanufacturer,softwareandhardwareversions,and
serialorassetnumbers
TheinformationsentbyanLLDPenableddeviceisextractedandtabulatedbyitspeers.The
communicationcan
bedonewheninformationchangesoronaperiodicbasis.Theinformation
tabulatedisagedtoensurethatitiskeptuptodate.Portscanbeconfiguredtosendthis
information,receivethisinformation,orbothsendandreceive.
EitherLLDPorLLDPMED,butnotboth,canbeused
onaninterfacebetweentwodevices.A
switchportusesLLDPMEDwhenitdetectsthatanLLDPMEDcapabledeviceisconnectedtoit.
LLDPinformationiscontainedwithinaLinkLayerDiscoveryProtocolDataUnit(LLDPDU)sent
inasingle8 02.3Ethernetframe.TheinformationfieldsinLLDPDUare
asequenceofshort,
variablelength,informationelementsknownasTLVstype,length,andvaluefieldswhere:
•Typeidentifieswhatkindofinformationisbeingsent
•Lengthindicates thelengthoftheinformation stringinoctets
•Valueistheactualinformationthatneedstobesent
TheLLDPstandardspecifiesthatcertain
TLVsaremandatoryintransmi tted LLDPDUs,while
othersareoptional.YoucanconfigureonaportspecificbasiswhichoptionalLLDPandLLDP
MEDTLVsshouldbesentinLLDPDUs.
Purpose
ToreviewandconfigureLLPDandLLPDMED.
Commands
ThecommandsusedtoreviewandconfiguretheCDPdiscoveryprotocolarelistedbelow.
For information about... Refer to page...
show lldp 6-14
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