Specifications

Configuring Link Layer Discovery Protocol and LLDP-MED
SecureStack B2 Configuration Guide 6-13
Examples
ThisexampleshowshowtoclearalltheCiscoDPparametersbacktothedefaultsettings.
B2(rw)->clear ciscodp
ThisexampleshowshowtocleartheCiscoDPstatusonportfe.1.5.
B2(rw)->clear ciscodp port status fe.1.5
Configuring Link Layer Discovery Protocol and LLDP-MED
Overview
TheLinkLayerDiscoveryProtocol(LLPD)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transmi tted 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.
For information about... Refer to page...
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