Enterasys SecureStack B3

Configuring Link Layer Discovery Protocol and LLDP-MED
SecureStack B3 Configuration Guide 4-13
Examples
ThisexampleshowshowtoclearalltheCiscoDPparametersbacktothedefaultsettings.
B3(rw)->clear ciscodp
ThisexampleshowshowtocleartheCiscoDPstatusonportge.1.5.
B3(rw)->clear ciscodp port status ge.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ind ustry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fol lowing 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.